mirror of
https://github.com/git/git.git
synced 2024-10-31 14:27:54 +01:00
0c4cd7f4a7
f2eba66
(Enable HEAD@{...} and make it independent from the current
branch, 2007-02-03) introduced dwim_log() to handle <refname>@{...}
syntax, and as part of its processing, it checks if the ref exists by
calling refsolve_ref(). It should call it as a reader to make sure the
call returns NULL for a nonexistent ref (not as a potential writer in
which case it does not return NULL).
Signed-off-by: Junio C Hamano <gitster@pobox.com>
745 lines
16 KiB
C
745 lines
16 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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static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
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{
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struct alternate_object_database *alt;
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char hex[40];
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int found = 0;
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static struct alternate_object_database *fakeent;
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if (!fakeent) {
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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", name);
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for (alt = fakeent; alt && found < 2; alt = alt->next) {
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struct dirent *de;
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DIR *dir;
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sprintf(alt->name, "%.2s/", name);
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dir = opendir(alt->base);
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if (!dir)
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continue;
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while ((de = readdir(dir)) != NULL) {
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if (strlen(de->d_name) != 38)
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continue;
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if (memcmp(de->d_name, name + 2, len - 2))
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continue;
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if (!found) {
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memcpy(hex + 2, de->d_name, 38);
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found++;
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}
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else if (memcmp(hex + 2, de->d_name, 38)) {
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found = 2;
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break;
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}
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}
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closedir(dir);
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}
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if (found == 1)
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return get_sha1_hex(hex, sha1) == 0;
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return found;
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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 int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
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{
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struct packed_git *p;
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const unsigned char *found_sha1 = NULL;
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int found = 0;
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prepare_packed_git();
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for (p = packed_git; p && found < 2; p = p->next) {
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uint32_t num, last;
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uint32_t first = 0;
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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 *now;
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int cmp;
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now = nth_packed_object_sha1(p, mid);
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cmp = hashcmp(match, now);
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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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if (first < num) {
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const unsigned char *now, *next;
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now = nth_packed_object_sha1(p, first);
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if (match_sha(len, match, now)) {
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next = nth_packed_object_sha1(p, first+1);
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if (!next|| !match_sha(len, match, next)) {
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/* unique within this pack */
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if (!found) {
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found_sha1 = now;
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found++;
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}
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else if (hashcmp(found_sha1, now)) {
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found = 2;
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break;
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}
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}
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else {
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/* not even unique within this pack */
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found = 2;
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break;
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}
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}
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}
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}
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if (found == 1)
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hashcpy(sha1, found_sha1);
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return found;
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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 find_unique_short_object(int len, char *canonical,
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unsigned char *res, unsigned char *sha1)
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{
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int has_unpacked, has_packed;
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unsigned char unpacked_sha1[20], packed_sha1[20];
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prepare_alt_odb();
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has_unpacked = find_short_object_filename(len, canonical, unpacked_sha1);
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has_packed = find_short_packed_object(len, res, packed_sha1);
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if (!has_unpacked && !has_packed)
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return SHORT_NAME_NOT_FOUND;
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if (1 < has_unpacked || 1 < has_packed)
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return SHORT_NAME_AMBIGUOUS;
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if (has_unpacked != has_packed) {
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hashcpy(sha1, (has_packed ? packed_sha1 : unpacked_sha1));
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return 0;
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}
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/* Both have unique ones -- do they match? */
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if (hashcmp(packed_sha1, unpacked_sha1))
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return SHORT_NAME_AMBIGUOUS;
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hashcpy(sha1, packed_sha1);
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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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int quietly)
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{
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int i, status;
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char canonical[40];
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unsigned char res[20];
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if (len < MINIMUM_ABBREV || len > 40)
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return -1;
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hashclr(res);
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memset(canonical, '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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canonical[i] = c;
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if (!(i & 1))
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val <<= 4;
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res[i >> 1] |= val;
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}
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status = find_unique_short_object(i, canonical, res, sha1);
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if (!quietly && (status == SHORT_NAME_AMBIGUOUS))
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return error("short SHA1 %.*s is ambiguous.", len, canonical);
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return status;
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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, 1);
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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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int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
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{
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const char **p, *r;
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int refs_found = 0;
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*ref = NULL;
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for (p = ref_rev_parse_rules; *p; p++) {
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unsigned char sha1_from_ref[20];
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unsigned char *this_result;
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this_result = refs_found ? sha1_from_ref : sha1;
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r = resolve_ref(mkpath(*p, len, str), this_result, 1, NULL);
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if (r) {
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if (!refs_found++)
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*ref = xstrdup(r);
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if (!warn_ambiguous_refs)
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break;
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}
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}
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return refs_found;
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}
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int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
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{
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const char **p;
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int logs_found = 0;
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*log = NULL;
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for (p = ref_rev_parse_rules; *p; p++) {
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struct stat st;
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unsigned char hash[20];
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char path[PATH_MAX];
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const char *ref, *it;
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strcpy(path, mkpath(*p, len, str));
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ref = resolve_ref(path, hash, 1, NULL);
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if (!ref)
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continue;
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if (!stat(git_path("logs/%s", path), &st) &&
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S_ISREG(st.st_mode))
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it = path;
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else if (strcmp(ref, path) &&
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!stat(git_path("logs/%s", ref), &st) &&
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S_ISREG(st.st_mode))
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it = ref;
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else
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continue;
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if (!logs_found++) {
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*log = xstrdup(it);
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hashcpy(sha1, hash);
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}
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if (!warn_ambiguous_refs)
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break;
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}
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return logs_found;
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}
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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 *warning = "warning: refname '%.*s' is ambiguous.\n";
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char *real_ref = NULL;
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int refs_found = 0;
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int at, reflog_len;
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if (len == 40 && !get_sha1_hex(str, sha1))
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return 0;
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/* basic@{time or number} format to query ref-log */
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reflog_len = at = 0;
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if (str[len-1] == '}') {
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for (at = 0; at < len - 1; at++) {
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if (str[at] == '@' && str[at+1] == '{') {
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reflog_len = (len-1) - (at+2);
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len = at;
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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 (!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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if (!refs_found)
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return -1;
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if (warn_ambiguous_refs && refs_found > 1)
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fprintf(stderr, warning, len, str);
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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? */
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for (i = nth = 0; 0 <= nth && i < reflog_len; i++) {
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char ch = str[at+2+i];
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if ('0' <= ch && ch <= '9')
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nth = nth * 10 + ch - '0';
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else
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nth = -1;
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}
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if (0 <= nth)
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at_time = 0;
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else {
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char *tmp = xstrndup(str + at + 2, reflog_len);
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at_time = approxidate(tmp);
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free(tmp);
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}
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if (read_ref_at(real_ref, at_time, nth, sha1, NULL,
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&co_time, &co_tz, &co_cnt)) {
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if (at_time)
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fprintf(stderr,
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"warning: Log for '%.*s' only goes "
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"back to %s.\n", len, str,
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show_date(co_time, co_tz, DATE_RFC2822));
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else
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fprintf(stderr,
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"warning: Log for '%.*s' only has "
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"%d entries.\n", len, str, co_cnt);
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}
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}
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free(real_ref);
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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);
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static int get_parent(const char *name, int len,
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unsigned char *result, int idx)
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{
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unsigned char sha1[20];
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int ret = get_sha1_1(name, len, sha1);
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struct commit *commit;
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struct commit_list *p;
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if (ret)
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return ret;
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commit = lookup_commit_reference(sha1);
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if (!commit)
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return -1;
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if (parse_commit(commit))
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return -1;
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if (!idx) {
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hashcpy(result, commit->object.sha1);
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return 0;
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}
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p = commit->parents;
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while (p) {
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if (!--idx) {
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hashcpy(result, p->item->object.sha1);
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return 0;
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}
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p = p->next;
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}
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return -1;
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}
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static int get_nth_ancestor(const char *name, int len,
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unsigned char *result, int generation)
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{
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unsigned char sha1[20];
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struct commit *commit;
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int ret;
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ret = get_sha1_1(name, len, sha1);
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if (ret)
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return ret;
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commit = lookup_commit_reference(sha1);
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if (!commit)
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return -1;
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while (generation--) {
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if (parse_commit(commit) || !commit->parents)
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return -1;
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commit = commit->parents->item;
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}
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hashcpy(result, commit->object.sha1);
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return 0;
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}
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struct object *peel_to_type(const char *name, int namelen,
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struct object *o, enum object_type expected_type)
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{
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if (name && !namelen)
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namelen = strlen(name);
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if (!o) {
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unsigned char sha1[20];
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if (get_sha1_1(name, namelen, sha1))
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return NULL;
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o = parse_object(sha1);
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}
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while (1) {
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if (!o || (!o->parsed && !parse_object(o->sha1)))
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return NULL;
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if (o->type == expected_type)
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return o;
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if (o->type == OBJ_TAG)
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o = ((struct tag*) o)->tagged;
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else if (o->type == OBJ_COMMIT)
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o = &(((struct commit *) o)->tree->object);
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else {
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if (name)
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error("%.*s: expected %s type, but the object "
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"dereferences to %s type",
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namelen, name, typename(expected_type),
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typename(o->type));
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return NULL;
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}
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}
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}
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static int peel_onion(const char *name, int len, unsigned char *sha1)
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{
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unsigned char outer[20];
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const char *sp;
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unsigned int expected_type = 0;
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struct object *o;
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/*
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* "ref^{type}" dereferences ref repeatedly until you cannot
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* dereference anymore, or you get an object of given type,
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* whichever comes first. "ref^{}" means just dereference
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* tags until you get a non-tag. "ref^0" is a shorthand for
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* "ref^{commit}". "commit^{tree}" could be used to find the
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* top-level tree of the given commit.
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*/
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if (len < 4 || name[len-1] != '}')
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return -1;
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for (sp = name + len - 1; name <= sp; sp--) {
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int ch = *sp;
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if (ch == '{' && name < sp && sp[-1] == '^')
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break;
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}
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if (sp <= name)
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return -1;
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sp++; /* beginning of type name, or closing brace for empty */
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if (!strncmp(commit_type, sp, 6) && sp[6] == '}')
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expected_type = OBJ_COMMIT;
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else if (!strncmp(tree_type, sp, 4) && sp[4] == '}')
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expected_type = OBJ_TREE;
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else if (!strncmp(blob_type, sp, 4) && sp[4] == '}')
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expected_type = OBJ_BLOB;
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else if (sp[0] == '}')
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expected_type = OBJ_NONE;
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else
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return -1;
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if (get_sha1_1(name, sp - name - 2, outer))
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return -1;
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o = parse_object(outer);
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if (!o)
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return -1;
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if (!expected_type) {
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o = deref_tag(o, name, sp - name - 2);
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if (!o || (!o->parsed && !parse_object(o->sha1)))
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return -1;
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hashcpy(sha1, o->sha1);
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}
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else {
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/*
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* At this point, the syntax look correct, so
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* if we do not get the needed object, we should
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* barf.
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*/
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o = peel_to_type(name, len, o, expected_type);
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if (o) {
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hashcpy(sha1, o->sha1);
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return 0;
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}
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return -1;
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}
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return 0;
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}
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static int get_describe_name(const char *name, int len, unsigned char *sha1)
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{
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const char *cp;
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|
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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, 1);
|
|
}
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int get_sha1_1(const char *name, int len, unsigned char *sha1)
|
|
{
|
|
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, 0);
|
|
}
|
|
|
|
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;
|
|
insert_by_date((struct commit *)object, list);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This interprets names like ':/Initial revision of "git"' by searching
|
|
* through history and returning the first commit whose message starts
|
|
* with the given string.
|
|
*
|
|
* For future extension, ':/!' is reserved. If you want to match a message
|
|
* beginning with a '!', you have to repeat the exclamation mark.
|
|
*/
|
|
|
|
#define ONELINE_SEEN (1u<<20)
|
|
static int get_sha1_oneline(const char *prefix, unsigned char *sha1)
|
|
{
|
|
struct commit_list *list = NULL, *backup = NULL, *l;
|
|
int retval = -1;
|
|
char *temp_commit_buffer = NULL;
|
|
|
|
if (prefix[0] == '!') {
|
|
if (prefix[1] != '!')
|
|
die ("Invalid search pattern: %s", prefix);
|
|
prefix++;
|
|
}
|
|
for_each_ref(handle_one_ref, &list);
|
|
for (l = list; l; l = l->next)
|
|
commit_list_insert(l->item, &backup);
|
|
while (list) {
|
|
char *p;
|
|
struct commit *commit;
|
|
enum object_type type;
|
|
unsigned long size;
|
|
|
|
commit = pop_most_recent_commit(&list, ONELINE_SEEN);
|
|
if (!parse_object(commit->object.sha1))
|
|
continue;
|
|
free(temp_commit_buffer);
|
|
if (commit->buffer)
|
|
p = commit->buffer;
|
|
else {
|
|
p = read_sha1_file(commit->object.sha1, &type, &size);
|
|
if (!p)
|
|
continue;
|
|
temp_commit_buffer = p;
|
|
}
|
|
if (!(p = strstr(p, "\n\n")))
|
|
continue;
|
|
if (!prefixcmp(p + 2, prefix)) {
|
|
hashcpy(sha1, commit->object.sha1);
|
|
retval = 0;
|
|
break;
|
|
}
|
|
}
|
|
free(temp_commit_buffer);
|
|
free_commit_list(list);
|
|
for (l = backup; l; l = l->next)
|
|
clear_commit_marks(l->item, ONELINE_SEEN);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
unsigned unused;
|
|
return get_sha1_with_mode(name, sha1, &unused);
|
|
}
|
|
|
|
int get_sha1_with_mode(const char *name, unsigned char *sha1, unsigned *mode)
|
|
{
|
|
int ret, bracket_depth;
|
|
int namelen = strlen(name);
|
|
const char *cp;
|
|
|
|
*mode = S_IFINVALID;
|
|
ret = get_sha1_1(name, namelen, sha1);
|
|
if (!ret)
|
|
return ret;
|
|
/* sha1:path --> object name of path in ent sha1
|
|
* :path -> object name of path in index
|
|
* :[0-3]:path -> object name of path in index at stage
|
|
*/
|
|
if (name[0] == ':') {
|
|
int stage = 0;
|
|
struct cache_entry *ce;
|
|
int pos;
|
|
if (namelen > 2 && name[1] == '/')
|
|
return get_sha1_oneline(name + 2, sha1);
|
|
if (namelen < 3 ||
|
|
name[2] != ':' ||
|
|
name[1] < '0' || '3' < name[1])
|
|
cp = name + 1;
|
|
else {
|
|
stage = name[1] - '0';
|
|
cp = name + 3;
|
|
}
|
|
namelen = namelen - (cp - name);
|
|
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);
|
|
*mode = ce->ce_mode;
|
|
return 0;
|
|
}
|
|
pos++;
|
|
}
|
|
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];
|
|
if (!get_sha1_1(name, cp-name, tree_sha1))
|
|
return get_tree_entry(tree_sha1, cp+1, sha1,
|
|
mode);
|
|
}
|
|
return ret;
|
|
}
|