mirror of
https://github.com/git/git.git
synced 2024-10-31 14:27:54 +01:00
e992d1eb39
Signed-off-by: Rene Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1468 lines
36 KiB
C
1468 lines
36 KiB
C
#include "cache.h"
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#include "tag.h"
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#include "commit.h"
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#include "tree.h"
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#include "blob.h"
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#include "tree-walk.h"
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#include "refs.h"
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#include "remote.h"
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static int get_sha1_oneline(const char *, unsigned char *, struct commit_list *);
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typedef int (*disambiguate_hint_fn)(const unsigned char *, void *);
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struct disambiguate_state {
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disambiguate_hint_fn fn;
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void *cb_data;
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unsigned char candidate[20];
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unsigned candidate_exists:1;
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unsigned candidate_checked:1;
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unsigned candidate_ok:1;
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unsigned disambiguate_fn_used:1;
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unsigned ambiguous:1;
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unsigned always_call_fn:1;
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};
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static void update_candidates(struct disambiguate_state *ds, const unsigned char *current)
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{
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if (ds->always_call_fn) {
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ds->ambiguous = ds->fn(current, ds->cb_data) ? 1 : 0;
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return;
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}
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if (!ds->candidate_exists) {
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/* this is the first candidate */
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hashcpy(ds->candidate, current);
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ds->candidate_exists = 1;
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return;
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} else if (!hashcmp(ds->candidate, current)) {
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/* the same as what we already have seen */
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return;
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}
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if (!ds->fn) {
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/* cannot disambiguate between ds->candidate and current */
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ds->ambiguous = 1;
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return;
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}
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if (!ds->candidate_checked) {
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ds->candidate_ok = ds->fn(ds->candidate, ds->cb_data);
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ds->disambiguate_fn_used = 1;
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ds->candidate_checked = 1;
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}
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if (!ds->candidate_ok) {
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/* discard the candidate; we know it does not satisfy fn */
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hashcpy(ds->candidate, current);
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ds->candidate_checked = 0;
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return;
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}
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/* if we reach this point, we know ds->candidate satisfies fn */
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if (ds->fn(current, ds->cb_data)) {
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/*
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* if both current and candidate satisfy fn, we cannot
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* disambiguate.
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*/
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ds->candidate_ok = 0;
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ds->ambiguous = 1;
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}
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/* otherwise, current can be discarded and candidate is still good */
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}
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static void find_short_object_filename(int len, const char *hex_pfx, struct disambiguate_state *ds)
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{
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struct alternate_object_database *alt;
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char hex[40];
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static struct alternate_object_database *fakeent;
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if (!fakeent) {
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/*
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* Create a "fake" alternate object database that
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* points to our own object database, to make it
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* easier to get a temporary working space in
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* alt->name/alt->base while iterating over the
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* object databases including our own.
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*/
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const char *objdir = get_object_directory();
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int objdir_len = strlen(objdir);
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int entlen = objdir_len + 43;
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fakeent = xmalloc(sizeof(*fakeent) + entlen);
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memcpy(fakeent->base, objdir, objdir_len);
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fakeent->name = fakeent->base + objdir_len + 1;
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fakeent->name[-1] = '/';
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}
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fakeent->next = alt_odb_list;
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sprintf(hex, "%.2s", hex_pfx);
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for (alt = fakeent; alt && !ds->ambiguous; alt = alt->next) {
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struct dirent *de;
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DIR *dir;
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sprintf(alt->name, "%.2s/", hex_pfx);
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dir = opendir(alt->base);
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if (!dir)
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continue;
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while (!ds->ambiguous && (de = readdir(dir)) != NULL) {
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unsigned char sha1[20];
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if (strlen(de->d_name) != 38)
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continue;
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if (memcmp(de->d_name, hex_pfx + 2, len - 2))
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continue;
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memcpy(hex + 2, de->d_name, 38);
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if (!get_sha1_hex(hex, sha1))
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update_candidates(ds, sha1);
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}
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closedir(dir);
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}
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}
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static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b)
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{
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do {
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if (*a != *b)
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return 0;
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a++;
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b++;
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len -= 2;
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} while (len > 1);
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if (len)
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if ((*a ^ *b) & 0xf0)
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return 0;
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return 1;
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}
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static void unique_in_pack(int len,
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const unsigned char *bin_pfx,
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struct packed_git *p,
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struct disambiguate_state *ds)
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{
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uint32_t num, last, i, first = 0;
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const unsigned char *current = NULL;
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open_pack_index(p);
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num = p->num_objects;
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last = num;
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while (first < last) {
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uint32_t mid = (first + last) / 2;
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const unsigned char *current;
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int cmp;
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current = nth_packed_object_sha1(p, mid);
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cmp = hashcmp(bin_pfx, current);
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if (!cmp) {
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first = mid;
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break;
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}
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if (cmp > 0) {
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first = mid+1;
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continue;
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}
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last = mid;
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}
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/*
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* At this point, "first" is the location of the lowest object
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* with an object name that could match "bin_pfx". See if we have
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* 0, 1 or more objects that actually match(es).
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*/
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for (i = first; i < num && !ds->ambiguous; i++) {
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current = nth_packed_object_sha1(p, i);
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if (!match_sha(len, bin_pfx, current))
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break;
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update_candidates(ds, current);
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}
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}
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static void find_short_packed_object(int len, const unsigned char *bin_pfx,
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struct disambiguate_state *ds)
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{
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struct packed_git *p;
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prepare_packed_git();
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for (p = packed_git; p && !ds->ambiguous; p = p->next)
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unique_in_pack(len, bin_pfx, p, ds);
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}
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#define SHORT_NAME_NOT_FOUND (-1)
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#define SHORT_NAME_AMBIGUOUS (-2)
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static int finish_object_disambiguation(struct disambiguate_state *ds,
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unsigned char *sha1)
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{
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if (ds->ambiguous)
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return SHORT_NAME_AMBIGUOUS;
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if (!ds->candidate_exists)
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return SHORT_NAME_NOT_FOUND;
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if (!ds->candidate_checked)
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/*
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* If this is the only candidate, there is no point
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* calling the disambiguation hint callback.
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*
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* On the other hand, if the current candidate
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* replaced an earlier candidate that did _not_ pass
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* the disambiguation hint callback, then we do have
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* more than one objects that match the short name
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* given, so we should make sure this one matches;
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* otherwise, if we discovered this one and the one
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* that we previously discarded in the reverse order,
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* we would end up showing different results in the
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* same repository!
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*/
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ds->candidate_ok = (!ds->disambiguate_fn_used ||
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ds->fn(ds->candidate, ds->cb_data));
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if (!ds->candidate_ok)
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return SHORT_NAME_AMBIGUOUS;
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hashcpy(sha1, ds->candidate);
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return 0;
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}
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static int disambiguate_commit_only(const unsigned char *sha1, void *cb_data_unused)
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{
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int kind = sha1_object_info(sha1, NULL);
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return kind == OBJ_COMMIT;
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}
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static int disambiguate_committish_only(const unsigned char *sha1, void *cb_data_unused)
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{
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struct object *obj;
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int kind;
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kind = sha1_object_info(sha1, NULL);
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if (kind == OBJ_COMMIT)
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return 1;
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if (kind != OBJ_TAG)
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return 0;
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/* We need to do this the hard way... */
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obj = deref_tag(parse_object(sha1), NULL, 0);
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if (obj && obj->type == OBJ_COMMIT)
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return 1;
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return 0;
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}
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static int disambiguate_tree_only(const unsigned char *sha1, void *cb_data_unused)
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{
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int kind = sha1_object_info(sha1, NULL);
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return kind == OBJ_TREE;
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}
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static int disambiguate_treeish_only(const unsigned char *sha1, void *cb_data_unused)
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{
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struct object *obj;
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int kind;
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kind = sha1_object_info(sha1, NULL);
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if (kind == OBJ_TREE || kind == OBJ_COMMIT)
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return 1;
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if (kind != OBJ_TAG)
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return 0;
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/* We need to do this the hard way... */
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obj = deref_tag(lookup_object(sha1), NULL, 0);
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if (obj && (obj->type == OBJ_TREE || obj->type == OBJ_COMMIT))
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return 1;
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return 0;
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}
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static int disambiguate_blob_only(const unsigned char *sha1, void *cb_data_unused)
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{
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int kind = sha1_object_info(sha1, NULL);
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return kind == OBJ_BLOB;
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}
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static int prepare_prefixes(const char *name, int len,
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unsigned char *bin_pfx,
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char *hex_pfx)
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{
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int i;
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hashclr(bin_pfx);
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memset(hex_pfx, 'x', 40);
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for (i = 0; i < len ;i++) {
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unsigned char c = name[i];
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unsigned char val;
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if (c >= '0' && c <= '9')
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val = c - '0';
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else if (c >= 'a' && c <= 'f')
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val = c - 'a' + 10;
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else if (c >= 'A' && c <='F') {
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val = c - 'A' + 10;
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c -= 'A' - 'a';
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}
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else
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return -1;
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hex_pfx[i] = c;
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if (!(i & 1))
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val <<= 4;
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bin_pfx[i >> 1] |= val;
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}
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return 0;
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}
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static int get_short_sha1(const char *name, int len, unsigned char *sha1,
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unsigned flags)
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{
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int status;
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char hex_pfx[40];
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unsigned char bin_pfx[20];
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struct disambiguate_state ds;
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int quietly = !!(flags & GET_SHA1_QUIETLY);
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if (len < MINIMUM_ABBREV || len > 40)
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return -1;
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if (prepare_prefixes(name, len, bin_pfx, hex_pfx) < 0)
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return -1;
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prepare_alt_odb();
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memset(&ds, 0, sizeof(ds));
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if (flags & GET_SHA1_COMMIT)
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ds.fn = disambiguate_commit_only;
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else if (flags & GET_SHA1_COMMITTISH)
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ds.fn = disambiguate_committish_only;
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else if (flags & GET_SHA1_TREE)
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ds.fn = disambiguate_tree_only;
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else if (flags & GET_SHA1_TREEISH)
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ds.fn = disambiguate_treeish_only;
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else if (flags & GET_SHA1_BLOB)
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ds.fn = disambiguate_blob_only;
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find_short_object_filename(len, hex_pfx, &ds);
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find_short_packed_object(len, bin_pfx, &ds);
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status = finish_object_disambiguation(&ds, sha1);
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if (!quietly && (status == SHORT_NAME_AMBIGUOUS))
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return error("short SHA1 %.*s is ambiguous.", len, hex_pfx);
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return status;
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}
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int for_each_abbrev(const char *prefix, each_abbrev_fn fn, void *cb_data)
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{
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char hex_pfx[40];
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unsigned char bin_pfx[20];
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struct disambiguate_state ds;
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int len = strlen(prefix);
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if (len < MINIMUM_ABBREV || len > 40)
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return -1;
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if (prepare_prefixes(prefix, len, bin_pfx, hex_pfx) < 0)
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return -1;
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prepare_alt_odb();
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memset(&ds, 0, sizeof(ds));
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ds.always_call_fn = 1;
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ds.cb_data = cb_data;
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ds.fn = fn;
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find_short_object_filename(len, hex_pfx, &ds);
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find_short_packed_object(len, bin_pfx, &ds);
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return ds.ambiguous;
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}
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const char *find_unique_abbrev(const unsigned char *sha1, int len)
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{
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int status, exists;
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static char hex[41];
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exists = has_sha1_file(sha1);
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memcpy(hex, sha1_to_hex(sha1), 40);
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if (len == 40 || !len)
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return hex;
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while (len < 40) {
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unsigned char sha1_ret[20];
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status = get_short_sha1(hex, len, sha1_ret, GET_SHA1_QUIETLY);
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if (exists
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? !status
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: status == SHORT_NAME_NOT_FOUND) {
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hex[len] = 0;
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return hex;
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}
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len++;
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}
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return hex;
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}
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static int ambiguous_path(const char *path, int len)
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{
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int slash = 1;
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int cnt;
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for (cnt = 0; cnt < len; cnt++) {
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switch (*path++) {
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case '\0':
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break;
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case '/':
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if (slash)
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break;
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slash = 1;
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continue;
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case '.':
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continue;
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default:
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slash = 0;
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continue;
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}
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break;
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}
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return slash;
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}
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static inline int upstream_mark(const char *string, int len)
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{
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const char *suffix[] = { "@{upstream}", "@{u}" };
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int i;
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for (i = 0; i < ARRAY_SIZE(suffix); i++) {
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int suffix_len = strlen(suffix[i]);
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if (suffix_len <= len
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&& !memcmp(string, suffix[i], suffix_len))
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return suffix_len;
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}
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return 0;
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}
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static int get_sha1_1(const char *name, int len, unsigned char *sha1, unsigned lookup_flags);
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static int interpret_nth_prior_checkout(const char *name, int namelen, struct strbuf *buf);
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static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
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{
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static const char *warn_msg = "refname '%.*s' is ambiguous.";
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static const char *object_name_msg = N_(
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"Git normally never creates a ref that ends with 40 hex characters\n"
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"because it will be ignored when you just specify 40-hex. These refs\n"
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"may be created by mistake. For example,\n"
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"\n"
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" git checkout -b $br $(git rev-parse ...)\n"
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"\n"
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"where \"$br\" is somehow empty and a 40-hex ref is created. Please\n"
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"examine these refs and maybe delete them. Turn this message off by\n"
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"running \"git config advice.objectNameWarning false\"");
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unsigned char tmp_sha1[20];
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char *real_ref = NULL;
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int refs_found = 0;
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int at, reflog_len, nth_prior = 0;
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if (len == 40 && !get_sha1_hex(str, sha1)) {
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if (warn_ambiguous_refs && warn_on_object_refname_ambiguity) {
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refs_found = dwim_ref(str, len, tmp_sha1, &real_ref);
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if (refs_found > 0) {
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warning(warn_msg, len, str);
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if (advice_object_name_warning)
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fprintf(stderr, "%s\n", _(object_name_msg));
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}
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free(real_ref);
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}
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return 0;
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}
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/* basic@{time or number or -number} format to query ref-log */
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reflog_len = at = 0;
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if (len && str[len-1] == '}') {
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for (at = len-4; at >= 0; at--) {
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if (str[at] == '@' && str[at+1] == '{') {
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if (str[at+2] == '-') {
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if (at != 0)
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/* @{-N} not at start */
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return -1;
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nth_prior = 1;
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continue;
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}
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if (!upstream_mark(str + at, len - at)) {
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reflog_len = (len-1) - (at+2);
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len = at;
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}
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break;
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}
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}
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}
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/* Accept only unambiguous ref paths. */
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if (len && ambiguous_path(str, len))
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return -1;
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if (nth_prior) {
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struct strbuf buf = STRBUF_INIT;
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int detached;
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if (interpret_nth_prior_checkout(str, len, &buf) > 0) {
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detached = (buf.len == 40 && !get_sha1_hex(buf.buf, sha1));
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strbuf_release(&buf);
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if (detached)
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return 0;
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}
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}
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if (!len && reflog_len)
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/* allow "@{...}" to mean the current branch reflog */
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refs_found = dwim_ref("HEAD", 4, sha1, &real_ref);
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else if (reflog_len)
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refs_found = dwim_log(str, len, sha1, &real_ref);
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else
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refs_found = dwim_ref(str, len, sha1, &real_ref);
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|
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if (!refs_found)
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return -1;
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if (warn_ambiguous_refs &&
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(refs_found > 1 ||
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!get_short_sha1(str, len, tmp_sha1, GET_SHA1_QUIETLY)))
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warning(warn_msg, len, str);
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|
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if (reflog_len) {
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int nth, i;
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unsigned long at_time;
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unsigned long co_time;
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int co_tz, co_cnt;
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|
|
|
/* Is it asking for N-th entry, or approxidate? */
|
|
for (i = nth = 0; 0 <= nth && i < reflog_len; i++) {
|
|
char ch = str[at+2+i];
|
|
if ('0' <= ch && ch <= '9')
|
|
nth = nth * 10 + ch - '0';
|
|
else
|
|
nth = -1;
|
|
}
|
|
if (100000000 <= nth) {
|
|
at_time = nth;
|
|
nth = -1;
|
|
} else if (0 <= nth)
|
|
at_time = 0;
|
|
else {
|
|
int errors = 0;
|
|
char *tmp = xstrndup(str + at + 2, reflog_len);
|
|
at_time = approxidate_careful(tmp, &errors);
|
|
free(tmp);
|
|
if (errors)
|
|
return -1;
|
|
}
|
|
if (read_ref_at(real_ref, at_time, nth, sha1, NULL,
|
|
&co_time, &co_tz, &co_cnt)) {
|
|
if (!len) {
|
|
if (starts_with(real_ref, "refs/heads/")) {
|
|
str = real_ref + 11;
|
|
len = strlen(real_ref + 11);
|
|
} else {
|
|
/* detached HEAD */
|
|
str = "HEAD";
|
|
len = 4;
|
|
}
|
|
}
|
|
if (at_time)
|
|
warning("Log for '%.*s' only goes "
|
|
"back to %s.", len, str,
|
|
show_date(co_time, co_tz, DATE_RFC2822));
|
|
else {
|
|
die("Log for '%.*s' only has %d entries.",
|
|
len, str, co_cnt);
|
|
}
|
|
}
|
|
}
|
|
|
|
free(real_ref);
|
|
return 0;
|
|
}
|
|
|
|
static int get_parent(const char *name, int len,
|
|
unsigned char *result, int idx)
|
|
{
|
|
unsigned char sha1[20];
|
|
int ret = get_sha1_1(name, len, sha1, GET_SHA1_COMMITTISH);
|
|
struct commit *commit;
|
|
struct commit_list *p;
|
|
|
|
if (ret)
|
|
return ret;
|
|
commit = lookup_commit_reference(sha1);
|
|
if (parse_commit(commit))
|
|
return -1;
|
|
if (!idx) {
|
|
hashcpy(result, commit->object.sha1);
|
|
return 0;
|
|
}
|
|
p = commit->parents;
|
|
while (p) {
|
|
if (!--idx) {
|
|
hashcpy(result, p->item->object.sha1);
|
|
return 0;
|
|
}
|
|
p = p->next;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int get_nth_ancestor(const char *name, int len,
|
|
unsigned char *result, int generation)
|
|
{
|
|
unsigned char sha1[20];
|
|
struct commit *commit;
|
|
int ret;
|
|
|
|
ret = get_sha1_1(name, len, sha1, GET_SHA1_COMMITTISH);
|
|
if (ret)
|
|
return ret;
|
|
commit = lookup_commit_reference(sha1);
|
|
if (!commit)
|
|
return -1;
|
|
|
|
while (generation--) {
|
|
if (parse_commit(commit) || !commit->parents)
|
|
return -1;
|
|
commit = commit->parents->item;
|
|
}
|
|
hashcpy(result, commit->object.sha1);
|
|
return 0;
|
|
}
|
|
|
|
struct object *peel_to_type(const char *name, int namelen,
|
|
struct object *o, enum object_type expected_type)
|
|
{
|
|
if (name && !namelen)
|
|
namelen = strlen(name);
|
|
while (1) {
|
|
if (!o || (!o->parsed && !parse_object(o->sha1)))
|
|
return NULL;
|
|
if (expected_type == OBJ_ANY || o->type == expected_type)
|
|
return o;
|
|
if (o->type == OBJ_TAG)
|
|
o = ((struct tag*) o)->tagged;
|
|
else if (o->type == OBJ_COMMIT)
|
|
o = &(((struct commit *) o)->tree->object);
|
|
else {
|
|
if (name)
|
|
error("%.*s: expected %s type, but the object "
|
|
"dereferences to %s type",
|
|
namelen, name, typename(expected_type),
|
|
typename(o->type));
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int peel_onion(const char *name, int len, unsigned char *sha1)
|
|
{
|
|
unsigned char outer[20];
|
|
const char *sp;
|
|
unsigned int expected_type = 0;
|
|
unsigned lookup_flags = 0;
|
|
struct object *o;
|
|
|
|
/*
|
|
* "ref^{type}" dereferences ref repeatedly until you cannot
|
|
* dereference anymore, or you get an object of given type,
|
|
* whichever comes first. "ref^{}" means just dereference
|
|
* tags until you get a non-tag. "ref^0" is a shorthand for
|
|
* "ref^{commit}". "commit^{tree}" could be used to find the
|
|
* top-level tree of the given commit.
|
|
*/
|
|
if (len < 4 || name[len-1] != '}')
|
|
return -1;
|
|
|
|
for (sp = name + len - 1; name <= sp; sp--) {
|
|
int ch = *sp;
|
|
if (ch == '{' && name < sp && sp[-1] == '^')
|
|
break;
|
|
}
|
|
if (sp <= name)
|
|
return -1;
|
|
|
|
sp++; /* beginning of type name, or closing brace for empty */
|
|
if (starts_with(sp, "commit}"))
|
|
expected_type = OBJ_COMMIT;
|
|
else if (starts_with(sp, "tag}"))
|
|
expected_type = OBJ_TAG;
|
|
else if (starts_with(sp, "tree}"))
|
|
expected_type = OBJ_TREE;
|
|
else if (starts_with(sp, "blob}"))
|
|
expected_type = OBJ_BLOB;
|
|
else if (starts_with(sp, "object}"))
|
|
expected_type = OBJ_ANY;
|
|
else if (sp[0] == '}')
|
|
expected_type = OBJ_NONE;
|
|
else if (sp[0] == '/')
|
|
expected_type = OBJ_COMMIT;
|
|
else
|
|
return -1;
|
|
|
|
if (expected_type == OBJ_COMMIT)
|
|
lookup_flags = GET_SHA1_COMMITTISH;
|
|
else if (expected_type == OBJ_TREE)
|
|
lookup_flags = GET_SHA1_TREEISH;
|
|
|
|
if (get_sha1_1(name, sp - name - 2, outer, lookup_flags))
|
|
return -1;
|
|
|
|
o = parse_object(outer);
|
|
if (!o)
|
|
return -1;
|
|
if (!expected_type) {
|
|
o = deref_tag(o, name, sp - name - 2);
|
|
if (!o || (!o->parsed && !parse_object(o->sha1)))
|
|
return -1;
|
|
hashcpy(sha1, o->sha1);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* At this point, the syntax look correct, so
|
|
* if we do not get the needed object, we should
|
|
* barf.
|
|
*/
|
|
o = peel_to_type(name, len, o, expected_type);
|
|
if (!o)
|
|
return -1;
|
|
|
|
hashcpy(sha1, o->sha1);
|
|
if (sp[0] == '/') {
|
|
/* "$commit^{/foo}" */
|
|
char *prefix;
|
|
int ret;
|
|
struct commit_list *list = NULL;
|
|
|
|
/*
|
|
* $commit^{/}. Some regex implementation may reject.
|
|
* We don't need regex anyway. '' pattern always matches.
|
|
*/
|
|
if (sp[1] == '}')
|
|
return 0;
|
|
|
|
prefix = xstrndup(sp + 1, name + len - 1 - (sp + 1));
|
|
commit_list_insert((struct commit *)o, &list);
|
|
ret = get_sha1_oneline(prefix, sha1, list);
|
|
free(prefix);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int get_describe_name(const char *name, int len, unsigned char *sha1)
|
|
{
|
|
const char *cp;
|
|
unsigned flags = GET_SHA1_QUIETLY | GET_SHA1_COMMIT;
|
|
|
|
for (cp = name + len - 1; name + 2 <= cp; cp--) {
|
|
char ch = *cp;
|
|
if (hexval(ch) & ~0377) {
|
|
/* We must be looking at g in "SOMETHING-g"
|
|
* for it to be describe output.
|
|
*/
|
|
if (ch == 'g' && cp[-1] == '-') {
|
|
cp++;
|
|
len -= cp - name;
|
|
return get_short_sha1(cp, len, sha1, flags);
|
|
}
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int get_sha1_1(const char *name, int len, unsigned char *sha1, unsigned lookup_flags)
|
|
{
|
|
int ret, has_suffix;
|
|
const char *cp;
|
|
|
|
/*
|
|
* "name~3" is "name^^^", "name~" is "name~1", and "name^" is "name^1".
|
|
*/
|
|
has_suffix = 0;
|
|
for (cp = name + len - 1; name <= cp; cp--) {
|
|
int ch = *cp;
|
|
if ('0' <= ch && ch <= '9')
|
|
continue;
|
|
if (ch == '~' || ch == '^')
|
|
has_suffix = ch;
|
|
break;
|
|
}
|
|
|
|
if (has_suffix) {
|
|
int num = 0;
|
|
int len1 = cp - name;
|
|
cp++;
|
|
while (cp < name + len)
|
|
num = num * 10 + *cp++ - '0';
|
|
if (!num && len1 == len - 1)
|
|
num = 1;
|
|
if (has_suffix == '^')
|
|
return get_parent(name, len1, sha1, num);
|
|
/* else if (has_suffix == '~') -- goes without saying */
|
|
return get_nth_ancestor(name, len1, sha1, num);
|
|
}
|
|
|
|
ret = peel_onion(name, len, sha1);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
ret = get_sha1_basic(name, len, sha1);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
/* It could be describe output that is "SOMETHING-gXXXX" */
|
|
ret = get_describe_name(name, len, sha1);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
return get_short_sha1(name, len, sha1, lookup_flags);
|
|
}
|
|
|
|
/*
|
|
* This interprets names like ':/Initial revision of "git"' by searching
|
|
* through history and returning the first commit whose message starts
|
|
* the given regular expression.
|
|
*
|
|
* For future extension, ':/!' is reserved. If you want to match a message
|
|
* beginning with a '!', you have to repeat the exclamation mark.
|
|
*/
|
|
|
|
/* Remember to update object flag allocation in object.h */
|
|
#define ONELINE_SEEN (1u<<20)
|
|
|
|
static int handle_one_ref(const char *path,
|
|
const unsigned char *sha1, int flag, void *cb_data)
|
|
{
|
|
struct commit_list **list = cb_data;
|
|
struct object *object = parse_object(sha1);
|
|
if (!object)
|
|
return 0;
|
|
if (object->type == OBJ_TAG) {
|
|
object = deref_tag(object, path, strlen(path));
|
|
if (!object)
|
|
return 0;
|
|
}
|
|
if (object->type != OBJ_COMMIT)
|
|
return 0;
|
|
commit_list_insert_by_date((struct commit *)object, list);
|
|
return 0;
|
|
}
|
|
|
|
static int get_sha1_oneline(const char *prefix, unsigned char *sha1,
|
|
struct commit_list *list)
|
|
{
|
|
struct commit_list *backup = NULL, *l;
|
|
int found = 0;
|
|
regex_t regex;
|
|
|
|
if (prefix[0] == '!') {
|
|
if (prefix[1] != '!')
|
|
die ("Invalid search pattern: %s", prefix);
|
|
prefix++;
|
|
}
|
|
|
|
if (regcomp(®ex, prefix, REG_EXTENDED))
|
|
die("Invalid search pattern: %s", prefix);
|
|
|
|
for (l = list; l; l = l->next) {
|
|
l->item->object.flags |= ONELINE_SEEN;
|
|
commit_list_insert(l->item, &backup);
|
|
}
|
|
while (list) {
|
|
const char *p, *buf;
|
|
struct commit *commit;
|
|
int matches;
|
|
|
|
commit = pop_most_recent_commit(&list, ONELINE_SEEN);
|
|
if (!parse_object(commit->object.sha1))
|
|
continue;
|
|
buf = get_commit_buffer(commit, NULL);
|
|
p = strstr(buf, "\n\n");
|
|
matches = p && !regexec(®ex, p + 2, 0, NULL, 0);
|
|
unuse_commit_buffer(commit, buf);
|
|
|
|
if (matches) {
|
|
hashcpy(sha1, commit->object.sha1);
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
regfree(®ex);
|
|
free_commit_list(list);
|
|
for (l = backup; l; l = l->next)
|
|
clear_commit_marks(l->item, ONELINE_SEEN);
|
|
free_commit_list(backup);
|
|
return found ? 0 : -1;
|
|
}
|
|
|
|
struct grab_nth_branch_switch_cbdata {
|
|
int remaining;
|
|
struct strbuf buf;
|
|
};
|
|
|
|
static int grab_nth_branch_switch(unsigned char *osha1, unsigned char *nsha1,
|
|
const char *email, unsigned long timestamp, int tz,
|
|
const char *message, void *cb_data)
|
|
{
|
|
struct grab_nth_branch_switch_cbdata *cb = cb_data;
|
|
const char *match = NULL, *target = NULL;
|
|
size_t len;
|
|
|
|
if (skip_prefix(message, "checkout: moving from ", &match))
|
|
target = strstr(match, " to ");
|
|
|
|
if (!match || !target)
|
|
return 0;
|
|
if (--(cb->remaining) == 0) {
|
|
len = target - match;
|
|
strbuf_reset(&cb->buf);
|
|
strbuf_add(&cb->buf, match, len);
|
|
return 1; /* we are done */
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Parse @{-N} syntax, return the number of characters parsed
|
|
* if successful; otherwise signal an error with negative value.
|
|
*/
|
|
static int interpret_nth_prior_checkout(const char *name, int namelen,
|
|
struct strbuf *buf)
|
|
{
|
|
long nth;
|
|
int retval;
|
|
struct grab_nth_branch_switch_cbdata cb;
|
|
const char *brace;
|
|
char *num_end;
|
|
|
|
if (namelen < 4)
|
|
return -1;
|
|
if (name[0] != '@' || name[1] != '{' || name[2] != '-')
|
|
return -1;
|
|
brace = memchr(name, '}', namelen);
|
|
if (!brace)
|
|
return -1;
|
|
nth = strtol(name + 3, &num_end, 10);
|
|
if (num_end != brace)
|
|
return -1;
|
|
if (nth <= 0)
|
|
return -1;
|
|
cb.remaining = nth;
|
|
strbuf_init(&cb.buf, 20);
|
|
|
|
retval = 0;
|
|
if (0 < for_each_reflog_ent_reverse("HEAD", grab_nth_branch_switch, &cb)) {
|
|
strbuf_reset(buf);
|
|
strbuf_addbuf(buf, &cb.buf);
|
|
retval = brace - name + 1;
|
|
}
|
|
|
|
strbuf_release(&cb.buf);
|
|
return retval;
|
|
}
|
|
|
|
int get_sha1_mb(const char *name, unsigned char *sha1)
|
|
{
|
|
struct commit *one, *two;
|
|
struct commit_list *mbs;
|
|
unsigned char sha1_tmp[20];
|
|
const char *dots;
|
|
int st;
|
|
|
|
dots = strstr(name, "...");
|
|
if (!dots)
|
|
return get_sha1(name, sha1);
|
|
if (dots == name)
|
|
st = get_sha1("HEAD", sha1_tmp);
|
|
else {
|
|
struct strbuf sb;
|
|
strbuf_init(&sb, dots - name);
|
|
strbuf_add(&sb, name, dots - name);
|
|
st = get_sha1_committish(sb.buf, sha1_tmp);
|
|
strbuf_release(&sb);
|
|
}
|
|
if (st)
|
|
return st;
|
|
one = lookup_commit_reference_gently(sha1_tmp, 0);
|
|
if (!one)
|
|
return -1;
|
|
|
|
if (get_sha1_committish(dots[3] ? (dots + 3) : "HEAD", sha1_tmp))
|
|
return -1;
|
|
two = lookup_commit_reference_gently(sha1_tmp, 0);
|
|
if (!two)
|
|
return -1;
|
|
mbs = get_merge_bases(one, two, 1);
|
|
if (!mbs || mbs->next)
|
|
st = -1;
|
|
else {
|
|
st = 0;
|
|
hashcpy(sha1, mbs->item->object.sha1);
|
|
}
|
|
free_commit_list(mbs);
|
|
return st;
|
|
}
|
|
|
|
/* parse @something syntax, when 'something' is not {.*} */
|
|
static int interpret_empty_at(const char *name, int namelen, int len, struct strbuf *buf)
|
|
{
|
|
const char *next;
|
|
|
|
if (len || name[1] == '{')
|
|
return -1;
|
|
|
|
/* make sure it's a single @, or @@{.*}, not @foo */
|
|
next = memchr(name + len + 1, '@', namelen - len - 1);
|
|
if (next && next[1] != '{')
|
|
return -1;
|
|
if (!next)
|
|
next = name + namelen;
|
|
if (next != name + 1)
|
|
return -1;
|
|
|
|
strbuf_reset(buf);
|
|
strbuf_add(buf, "HEAD", 4);
|
|
return 1;
|
|
}
|
|
|
|
static int reinterpret(const char *name, int namelen, int len, struct strbuf *buf)
|
|
{
|
|
/* we have extra data, which might need further processing */
|
|
struct strbuf tmp = STRBUF_INIT;
|
|
int used = buf->len;
|
|
int ret;
|
|
|
|
strbuf_add(buf, name + len, namelen - len);
|
|
ret = interpret_branch_name(buf->buf, buf->len, &tmp);
|
|
/* that data was not interpreted, remove our cruft */
|
|
if (ret < 0) {
|
|
strbuf_setlen(buf, used);
|
|
return len;
|
|
}
|
|
strbuf_reset(buf);
|
|
strbuf_addbuf(buf, &tmp);
|
|
strbuf_release(&tmp);
|
|
/* tweak for size of {-N} versus expanded ref name */
|
|
return ret - used + len;
|
|
}
|
|
|
|
static void set_shortened_ref(struct strbuf *buf, const char *ref)
|
|
{
|
|
char *s = shorten_unambiguous_ref(ref, 0);
|
|
strbuf_reset(buf);
|
|
strbuf_addstr(buf, s);
|
|
free(s);
|
|
}
|
|
|
|
static const char *get_upstream_branch(const char *branch_buf, int len)
|
|
{
|
|
char *branch = xstrndup(branch_buf, len);
|
|
struct branch *upstream = branch_get(*branch ? branch : NULL);
|
|
|
|
/*
|
|
* Upstream can be NULL only if branch refers to HEAD and HEAD
|
|
* points to something different than a branch.
|
|
*/
|
|
if (!upstream)
|
|
die(_("HEAD does not point to a branch"));
|
|
if (!upstream->merge || !upstream->merge[0]->dst) {
|
|
if (!ref_exists(upstream->refname))
|
|
die(_("No such branch: '%s'"), branch);
|
|
if (!upstream->merge) {
|
|
die(_("No upstream configured for branch '%s'"),
|
|
upstream->name);
|
|
}
|
|
die(
|
|
_("Upstream branch '%s' not stored as a remote-tracking branch"),
|
|
upstream->merge[0]->src);
|
|
}
|
|
free(branch);
|
|
|
|
return upstream->merge[0]->dst;
|
|
}
|
|
|
|
static int interpret_upstream_mark(const char *name, int namelen,
|
|
int at, struct strbuf *buf)
|
|
{
|
|
int len;
|
|
|
|
len = upstream_mark(name + at, namelen - at);
|
|
if (!len)
|
|
return -1;
|
|
|
|
if (memchr(name, ':', at))
|
|
return -1;
|
|
|
|
set_shortened_ref(buf, get_upstream_branch(name, at));
|
|
return len + at;
|
|
}
|
|
|
|
/*
|
|
* This reads short-hand syntax that not only evaluates to a commit
|
|
* object name, but also can act as if the end user spelled the name
|
|
* of the branch from the command line.
|
|
*
|
|
* - "@{-N}" finds the name of the Nth previous branch we were on, and
|
|
* places the name of the branch in the given buf and returns the
|
|
* number of characters parsed if successful.
|
|
*
|
|
* - "<branch>@{upstream}" finds the name of the other ref that
|
|
* <branch> is configured to merge with (missing <branch> defaults
|
|
* to the current branch), and places the name of the branch in the
|
|
* given buf and returns the number of characters parsed if
|
|
* successful.
|
|
*
|
|
* If the input is not of the accepted format, it returns a negative
|
|
* number to signal an error.
|
|
*
|
|
* If the input was ok but there are not N branch switches in the
|
|
* reflog, it returns 0.
|
|
*/
|
|
int interpret_branch_name(const char *name, int namelen, struct strbuf *buf)
|
|
{
|
|
char *at;
|
|
const char *start;
|
|
int len = interpret_nth_prior_checkout(name, namelen, buf);
|
|
|
|
if (!namelen)
|
|
namelen = strlen(name);
|
|
|
|
if (!len) {
|
|
return len; /* syntax Ok, not enough switches */
|
|
} else if (len > 0) {
|
|
if (len == namelen)
|
|
return len; /* consumed all */
|
|
else
|
|
return reinterpret(name, namelen, len, buf);
|
|
}
|
|
|
|
for (start = name;
|
|
(at = memchr(start, '@', namelen - (start - name)));
|
|
start = at + 1) {
|
|
|
|
len = interpret_empty_at(name, namelen, at - name, buf);
|
|
if (len > 0)
|
|
return reinterpret(name, namelen, len, buf);
|
|
|
|
len = interpret_upstream_mark(name, namelen, at - name, buf);
|
|
if (len > 0)
|
|
return len;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
int strbuf_branchname(struct strbuf *sb, const char *name)
|
|
{
|
|
int len = strlen(name);
|
|
int used = interpret_branch_name(name, len, sb);
|
|
|
|
if (used == len)
|
|
return 0;
|
|
if (used < 0)
|
|
used = 0;
|
|
strbuf_add(sb, name + used, len - used);
|
|
return len;
|
|
}
|
|
|
|
int strbuf_check_branch_ref(struct strbuf *sb, const char *name)
|
|
{
|
|
strbuf_branchname(sb, name);
|
|
if (name[0] == '-')
|
|
return -1;
|
|
strbuf_splice(sb, 0, 0, "refs/heads/", 11);
|
|
return check_refname_format(sb->buf, 0);
|
|
}
|
|
|
|
/*
|
|
* This is like "get_sha1_basic()", except it allows "sha1 expressions",
|
|
* notably "xyz^" for "parent of xyz"
|
|
*/
|
|
int get_sha1(const char *name, unsigned char *sha1)
|
|
{
|
|
struct object_context unused;
|
|
return get_sha1_with_context(name, 0, sha1, &unused);
|
|
}
|
|
|
|
/*
|
|
* Many callers know that the user meant to name a commit-ish by
|
|
* syntactical positions where the object name appears. Calling this
|
|
* function allows the machinery to disambiguate shorter-than-unique
|
|
* abbreviated object names between commit-ish and others.
|
|
*
|
|
* Note that this does NOT error out when the named object is not a
|
|
* commit-ish. It is merely to give a hint to the disambiguation
|
|
* machinery.
|
|
*/
|
|
int get_sha1_committish(const char *name, unsigned char *sha1)
|
|
{
|
|
struct object_context unused;
|
|
return get_sha1_with_context(name, GET_SHA1_COMMITTISH,
|
|
sha1, &unused);
|
|
}
|
|
|
|
int get_sha1_treeish(const char *name, unsigned char *sha1)
|
|
{
|
|
struct object_context unused;
|
|
return get_sha1_with_context(name, GET_SHA1_TREEISH,
|
|
sha1, &unused);
|
|
}
|
|
|
|
int get_sha1_commit(const char *name, unsigned char *sha1)
|
|
{
|
|
struct object_context unused;
|
|
return get_sha1_with_context(name, GET_SHA1_COMMIT,
|
|
sha1, &unused);
|
|
}
|
|
|
|
int get_sha1_tree(const char *name, unsigned char *sha1)
|
|
{
|
|
struct object_context unused;
|
|
return get_sha1_with_context(name, GET_SHA1_TREE,
|
|
sha1, &unused);
|
|
}
|
|
|
|
int get_sha1_blob(const char *name, unsigned char *sha1)
|
|
{
|
|
struct object_context unused;
|
|
return get_sha1_with_context(name, GET_SHA1_BLOB,
|
|
sha1, &unused);
|
|
}
|
|
|
|
/* Must be called only when object_name:filename doesn't exist. */
|
|
static void diagnose_invalid_sha1_path(const char *prefix,
|
|
const char *filename,
|
|
const unsigned char *tree_sha1,
|
|
const char *object_name,
|
|
int object_name_len)
|
|
{
|
|
struct stat st;
|
|
unsigned char sha1[20];
|
|
unsigned mode;
|
|
|
|
if (!prefix)
|
|
prefix = "";
|
|
|
|
if (!lstat(filename, &st))
|
|
die("Path '%s' exists on disk, but not in '%.*s'.",
|
|
filename, object_name_len, object_name);
|
|
if (errno == ENOENT || errno == ENOTDIR) {
|
|
char *fullname = xstrfmt("%s%s", prefix, filename);
|
|
|
|
if (!get_tree_entry(tree_sha1, fullname,
|
|
sha1, &mode)) {
|
|
die("Path '%s' exists, but not '%s'.\n"
|
|
"Did you mean '%.*s:%s' aka '%.*s:./%s'?",
|
|
fullname,
|
|
filename,
|
|
object_name_len, object_name,
|
|
fullname,
|
|
object_name_len, object_name,
|
|
filename);
|
|
}
|
|
die("Path '%s' does not exist in '%.*s'",
|
|
filename, object_name_len, object_name);
|
|
}
|
|
}
|
|
|
|
/* Must be called only when :stage:filename doesn't exist. */
|
|
static void diagnose_invalid_index_path(int stage,
|
|
const char *prefix,
|
|
const char *filename)
|
|
{
|
|
struct stat st;
|
|
const struct cache_entry *ce;
|
|
int pos;
|
|
unsigned namelen = strlen(filename);
|
|
unsigned fullnamelen;
|
|
char *fullname;
|
|
|
|
if (!prefix)
|
|
prefix = "";
|
|
|
|
/* Wrong stage number? */
|
|
pos = cache_name_pos(filename, namelen);
|
|
if (pos < 0)
|
|
pos = -pos - 1;
|
|
if (pos < active_nr) {
|
|
ce = active_cache[pos];
|
|
if (ce_namelen(ce) == namelen &&
|
|
!memcmp(ce->name, filename, namelen))
|
|
die("Path '%s' is in the index, but not at stage %d.\n"
|
|
"Did you mean ':%d:%s'?",
|
|
filename, stage,
|
|
ce_stage(ce), filename);
|
|
}
|
|
|
|
/* Confusion between relative and absolute filenames? */
|
|
fullnamelen = namelen + strlen(prefix);
|
|
fullname = xmalloc(fullnamelen + 1);
|
|
strcpy(fullname, prefix);
|
|
strcat(fullname, filename);
|
|
pos = cache_name_pos(fullname, fullnamelen);
|
|
if (pos < 0)
|
|
pos = -pos - 1;
|
|
if (pos < active_nr) {
|
|
ce = active_cache[pos];
|
|
if (ce_namelen(ce) == fullnamelen &&
|
|
!memcmp(ce->name, fullname, fullnamelen))
|
|
die("Path '%s' is in the index, but not '%s'.\n"
|
|
"Did you mean ':%d:%s' aka ':%d:./%s'?",
|
|
fullname, filename,
|
|
ce_stage(ce), fullname,
|
|
ce_stage(ce), filename);
|
|
}
|
|
|
|
if (!lstat(filename, &st))
|
|
die("Path '%s' exists on disk, but not in the index.", filename);
|
|
if (errno == ENOENT || errno == ENOTDIR)
|
|
die("Path '%s' does not exist (neither on disk nor in the index).",
|
|
filename);
|
|
|
|
free(fullname);
|
|
}
|
|
|
|
|
|
static char *resolve_relative_path(const char *rel)
|
|
{
|
|
if (!starts_with(rel, "./") && !starts_with(rel, "../"))
|
|
return NULL;
|
|
|
|
if (!startup_info)
|
|
die("BUG: startup_info struct is not initialized.");
|
|
|
|
if (!is_inside_work_tree())
|
|
die("relative path syntax can't be used outside working tree.");
|
|
|
|
/* die() inside prefix_path() if resolved path is outside worktree */
|
|
return prefix_path(startup_info->prefix,
|
|
startup_info->prefix ? strlen(startup_info->prefix) : 0,
|
|
rel);
|
|
}
|
|
|
|
static int get_sha1_with_context_1(const char *name,
|
|
unsigned flags,
|
|
const char *prefix,
|
|
unsigned char *sha1,
|
|
struct object_context *oc)
|
|
{
|
|
int ret, bracket_depth;
|
|
int namelen = strlen(name);
|
|
const char *cp;
|
|
int only_to_die = flags & GET_SHA1_ONLY_TO_DIE;
|
|
|
|
memset(oc, 0, sizeof(*oc));
|
|
oc->mode = S_IFINVALID;
|
|
ret = get_sha1_1(name, namelen, sha1, flags);
|
|
if (!ret)
|
|
return ret;
|
|
/*
|
|
* sha1:path --> object name of path in ent sha1
|
|
* :path -> object name of absolute path in index
|
|
* :./path -> object name of path relative to cwd in index
|
|
* :[0-3]:path -> object name of path in index at stage
|
|
* :/foo -> recent commit matching foo
|
|
*/
|
|
if (name[0] == ':') {
|
|
int stage = 0;
|
|
const struct cache_entry *ce;
|
|
char *new_path = NULL;
|
|
int pos;
|
|
if (!only_to_die && namelen > 2 && name[1] == '/') {
|
|
struct commit_list *list = NULL;
|
|
for_each_ref(handle_one_ref, &list);
|
|
return get_sha1_oneline(name + 2, sha1, list);
|
|
}
|
|
if (namelen < 3 ||
|
|
name[2] != ':' ||
|
|
name[1] < '0' || '3' < name[1])
|
|
cp = name + 1;
|
|
else {
|
|
stage = name[1] - '0';
|
|
cp = name + 3;
|
|
}
|
|
new_path = resolve_relative_path(cp);
|
|
if (!new_path) {
|
|
namelen = namelen - (cp - name);
|
|
} else {
|
|
cp = new_path;
|
|
namelen = strlen(cp);
|
|
}
|
|
|
|
strncpy(oc->path, cp,
|
|
sizeof(oc->path));
|
|
oc->path[sizeof(oc->path)-1] = '\0';
|
|
|
|
if (!active_cache)
|
|
read_cache();
|
|
pos = cache_name_pos(cp, namelen);
|
|
if (pos < 0)
|
|
pos = -pos - 1;
|
|
while (pos < active_nr) {
|
|
ce = active_cache[pos];
|
|
if (ce_namelen(ce) != namelen ||
|
|
memcmp(ce->name, cp, namelen))
|
|
break;
|
|
if (ce_stage(ce) == stage) {
|
|
hashcpy(sha1, ce->sha1);
|
|
oc->mode = ce->ce_mode;
|
|
free(new_path);
|
|
return 0;
|
|
}
|
|
pos++;
|
|
}
|
|
if (only_to_die && name[1] && name[1] != '/')
|
|
diagnose_invalid_index_path(stage, prefix, cp);
|
|
free(new_path);
|
|
return -1;
|
|
}
|
|
for (cp = name, bracket_depth = 0; *cp; cp++) {
|
|
if (*cp == '{')
|
|
bracket_depth++;
|
|
else if (bracket_depth && *cp == '}')
|
|
bracket_depth--;
|
|
else if (!bracket_depth && *cp == ':')
|
|
break;
|
|
}
|
|
if (*cp == ':') {
|
|
unsigned char tree_sha1[20];
|
|
int len = cp - name;
|
|
if (!get_sha1_1(name, len, tree_sha1, GET_SHA1_TREEISH)) {
|
|
const char *filename = cp+1;
|
|
char *new_filename = NULL;
|
|
|
|
new_filename = resolve_relative_path(filename);
|
|
if (new_filename)
|
|
filename = new_filename;
|
|
ret = get_tree_entry(tree_sha1, filename, sha1, &oc->mode);
|
|
if (ret && only_to_die) {
|
|
diagnose_invalid_sha1_path(prefix, filename,
|
|
tree_sha1,
|
|
name, len);
|
|
}
|
|
hashcpy(oc->tree, tree_sha1);
|
|
strncpy(oc->path, filename,
|
|
sizeof(oc->path));
|
|
oc->path[sizeof(oc->path)-1] = '\0';
|
|
|
|
free(new_filename);
|
|
return ret;
|
|
} else {
|
|
if (only_to_die)
|
|
die("Invalid object name '%.*s'.", len, name);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Call this function when you know "name" given by the end user must
|
|
* name an object but it doesn't; the function _may_ die with a better
|
|
* diagnostic message than "no such object 'name'", e.g. "Path 'doc' does not
|
|
* exist in 'HEAD'" when given "HEAD:doc", or it may return in which case
|
|
* you have a chance to diagnose the error further.
|
|
*/
|
|
void maybe_die_on_misspelt_object_name(const char *name, const char *prefix)
|
|
{
|
|
struct object_context oc;
|
|
unsigned char sha1[20];
|
|
get_sha1_with_context_1(name, GET_SHA1_ONLY_TO_DIE, prefix, sha1, &oc);
|
|
}
|
|
|
|
int get_sha1_with_context(const char *str, unsigned flags, unsigned char *sha1, struct object_context *orc)
|
|
{
|
|
return get_sha1_with_context_1(str, flags, NULL, sha1, orc);
|
|
}
|