mirror of
https://github.com/git/git.git
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7839632167
Before writing the shallow file, we stat() the existing file to make sure it has not been updated since our operation began. However, we do not do so under a lock, so there is a possible race: 1. Process A takes the lock. 2. Process B calls check_shallow_file_for_update and finds no update. 3. Process A commits the lockfile. 4. Process B takes the lock, then overwrite's process A's changes. We can fix this by doing our check while we hold the lock. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
693 lines
18 KiB
C
693 lines
18 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "tag.h"
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#include "pkt-line.h"
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#include "remote.h"
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#include "refs.h"
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#include "sha1-array.h"
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#include "diff.h"
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#include "revision.h"
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#include "commit-slab.h"
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#include "sigchain.h"
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static int is_shallow = -1;
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static struct stat_validity shallow_stat;
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static char *alternate_shallow_file;
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void set_alternate_shallow_file(const char *path, int override)
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{
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if (is_shallow != -1)
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die("BUG: is_repository_shallow must not be called before set_alternate_shallow_file");
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if (alternate_shallow_file && !override)
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return;
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free(alternate_shallow_file);
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alternate_shallow_file = path ? xstrdup(path) : NULL;
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}
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int register_shallow(const unsigned char *sha1)
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{
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struct commit_graft *graft =
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xmalloc(sizeof(struct commit_graft));
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struct commit *commit = lookup_commit(sha1);
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hashcpy(graft->sha1, sha1);
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graft->nr_parent = -1;
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if (commit && commit->object.parsed)
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commit->parents = NULL;
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return register_commit_graft(graft, 0);
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}
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int is_repository_shallow(void)
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{
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FILE *fp;
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char buf[1024];
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const char *path = alternate_shallow_file;
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if (is_shallow >= 0)
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return is_shallow;
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if (!path)
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path = git_path("shallow");
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/*
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* fetch-pack sets '--shallow-file ""' as an indicator that no
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* shallow file should be used. We could just open it and it
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* will likely fail. But let's do an explicit check instead.
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*/
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if (!*path || (fp = fopen(path, "r")) == NULL) {
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stat_validity_clear(&shallow_stat);
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is_shallow = 0;
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return is_shallow;
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}
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stat_validity_update(&shallow_stat, fileno(fp));
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is_shallow = 1;
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while (fgets(buf, sizeof(buf), fp)) {
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unsigned char sha1[20];
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if (get_sha1_hex(buf, sha1))
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die("bad shallow line: %s", buf);
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register_shallow(sha1);
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}
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fclose(fp);
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return is_shallow;
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}
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struct commit_list *get_shallow_commits(struct object_array *heads, int depth,
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int shallow_flag, int not_shallow_flag)
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{
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int i = 0, cur_depth = 0;
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struct commit_list *result = NULL;
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struct object_array stack = OBJECT_ARRAY_INIT;
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struct commit *commit = NULL;
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struct commit_graft *graft;
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while (commit || i < heads->nr || stack.nr) {
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struct commit_list *p;
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if (!commit) {
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if (i < heads->nr) {
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commit = (struct commit *)
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deref_tag(heads->objects[i++].item, NULL, 0);
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if (!commit || commit->object.type != OBJ_COMMIT) {
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commit = NULL;
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continue;
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}
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if (!commit->util)
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commit->util = xmalloc(sizeof(int));
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*(int *)commit->util = 0;
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cur_depth = 0;
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} else {
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commit = (struct commit *)
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stack.objects[--stack.nr].item;
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cur_depth = *(int *)commit->util;
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}
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}
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parse_commit_or_die(commit);
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cur_depth++;
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if ((depth != INFINITE_DEPTH && cur_depth >= depth) ||
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(is_repository_shallow() && !commit->parents &&
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(graft = lookup_commit_graft(commit->object.sha1)) != NULL &&
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graft->nr_parent < 0)) {
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commit_list_insert(commit, &result);
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commit->object.flags |= shallow_flag;
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commit = NULL;
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continue;
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}
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commit->object.flags |= not_shallow_flag;
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for (p = commit->parents, commit = NULL; p; p = p->next) {
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if (!p->item->util) {
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int *pointer = xmalloc(sizeof(int));
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p->item->util = pointer;
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*pointer = cur_depth;
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} else {
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int *pointer = p->item->util;
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if (cur_depth >= *pointer)
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continue;
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*pointer = cur_depth;
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}
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if (p->next)
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add_object_array(&p->item->object,
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NULL, &stack);
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else {
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commit = p->item;
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cur_depth = *(int *)commit->util;
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}
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}
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}
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return result;
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}
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void check_shallow_file_for_update(void)
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{
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if (is_shallow == -1)
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die("BUG: shallow must be initialized by now");
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if (!stat_validity_check(&shallow_stat, git_path("shallow")))
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die("shallow file has changed since we read it");
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}
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#define SEEN_ONLY 1
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#define VERBOSE 2
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struct write_shallow_data {
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struct strbuf *out;
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int use_pack_protocol;
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int count;
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unsigned flags;
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};
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static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
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{
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struct write_shallow_data *data = cb_data;
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const char *hex = sha1_to_hex(graft->sha1);
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if (graft->nr_parent != -1)
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return 0;
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if (data->flags & SEEN_ONLY) {
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struct commit *c = lookup_commit(graft->sha1);
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if (!c || !(c->object.flags & SEEN)) {
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if (data->flags & VERBOSE)
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printf("Removing %s from .git/shallow\n",
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sha1_to_hex(c->object.sha1));
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return 0;
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}
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}
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data->count++;
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if (data->use_pack_protocol)
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packet_buf_write(data->out, "shallow %s", hex);
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else {
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strbuf_addstr(data->out, hex);
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strbuf_addch(data->out, '\n');
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}
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return 0;
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}
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static int write_shallow_commits_1(struct strbuf *out, int use_pack_protocol,
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const struct sha1_array *extra,
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unsigned flags)
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{
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struct write_shallow_data data;
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int i;
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data.out = out;
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data.use_pack_protocol = use_pack_protocol;
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data.count = 0;
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data.flags = flags;
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for_each_commit_graft(write_one_shallow, &data);
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if (!extra)
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return data.count;
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for (i = 0; i < extra->nr; i++) {
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strbuf_addstr(out, sha1_to_hex(extra->sha1[i]));
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strbuf_addch(out, '\n');
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data.count++;
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}
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return data.count;
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}
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int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
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const struct sha1_array *extra)
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{
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return write_shallow_commits_1(out, use_pack_protocol, extra, 0);
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}
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static struct strbuf temporary_shallow = STRBUF_INIT;
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static void remove_temporary_shallow(void)
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{
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if (temporary_shallow.len) {
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unlink_or_warn(temporary_shallow.buf);
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strbuf_reset(&temporary_shallow);
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}
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}
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static void remove_temporary_shallow_on_signal(int signo)
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{
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remove_temporary_shallow();
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sigchain_pop(signo);
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raise(signo);
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}
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const char *setup_temporary_shallow(const struct sha1_array *extra)
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{
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static int installed_handler;
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struct strbuf sb = STRBUF_INIT;
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int fd;
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if (temporary_shallow.len)
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die("BUG: attempt to create two temporary shallow files");
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if (write_shallow_commits(&sb, 0, extra)) {
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strbuf_addstr(&temporary_shallow, git_path("shallow_XXXXXX"));
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fd = xmkstemp(temporary_shallow.buf);
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if (!installed_handler) {
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atexit(remove_temporary_shallow);
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sigchain_push_common(remove_temporary_shallow_on_signal);
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}
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if (write_in_full(fd, sb.buf, sb.len) != sb.len)
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die_errno("failed to write to %s",
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temporary_shallow.buf);
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close(fd);
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strbuf_release(&sb);
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return temporary_shallow.buf;
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}
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/*
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* is_repository_shallow() sees empty string as "no shallow
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* file".
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*/
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return temporary_shallow.buf;
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}
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void setup_alternate_shallow(struct lock_file *shallow_lock,
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const char **alternate_shallow_file,
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const struct sha1_array *extra)
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{
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struct strbuf sb = STRBUF_INIT;
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int fd;
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fd = hold_lock_file_for_update(shallow_lock, git_path("shallow"),
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LOCK_DIE_ON_ERROR);
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check_shallow_file_for_update();
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if (write_shallow_commits(&sb, 0, extra)) {
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if (write_in_full(fd, sb.buf, sb.len) != sb.len)
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die_errno("failed to write to %s",
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shallow_lock->filename);
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*alternate_shallow_file = shallow_lock->filename;
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} else
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/*
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* is_repository_shallow() sees empty string as "no
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* shallow file".
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*/
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*alternate_shallow_file = "";
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strbuf_release(&sb);
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}
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static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
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{
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int fd = *(int *)cb;
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if (graft->nr_parent == -1)
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packet_write(fd, "shallow %s\n", sha1_to_hex(graft->sha1));
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return 0;
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}
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void advertise_shallow_grafts(int fd)
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{
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if (!is_repository_shallow())
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return;
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for_each_commit_graft(advertise_shallow_grafts_cb, &fd);
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}
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/*
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* mark_reachable_objects() should have been run prior to this and all
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* reachable commits marked as "SEEN".
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*/
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void prune_shallow(int show_only)
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{
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static struct lock_file shallow_lock;
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struct strbuf sb = STRBUF_INIT;
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int fd;
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if (show_only) {
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write_shallow_commits_1(&sb, 0, NULL, SEEN_ONLY | VERBOSE);
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strbuf_release(&sb);
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return;
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}
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fd = hold_lock_file_for_update(&shallow_lock, git_path("shallow"),
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LOCK_DIE_ON_ERROR);
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check_shallow_file_for_update();
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if (write_shallow_commits_1(&sb, 0, NULL, SEEN_ONLY)) {
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if (write_in_full(fd, sb.buf, sb.len) != sb.len)
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die_errno("failed to write to %s",
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shallow_lock.filename);
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commit_lock_file(&shallow_lock);
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} else {
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unlink(git_path("shallow"));
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rollback_lock_file(&shallow_lock);
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}
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strbuf_release(&sb);
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}
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#define TRACE_KEY "GIT_TRACE_SHALLOW"
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/*
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* Step 1, split sender shallow commits into "ours" and "theirs"
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* Step 2, clean "ours" based on .git/shallow
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*/
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void prepare_shallow_info(struct shallow_info *info, struct sha1_array *sa)
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{
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int i;
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trace_printf_key(TRACE_KEY, "shallow: prepare_shallow_info\n");
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memset(info, 0, sizeof(*info));
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info->shallow = sa;
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if (!sa)
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return;
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info->ours = xmalloc(sizeof(*info->ours) * sa->nr);
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info->theirs = xmalloc(sizeof(*info->theirs) * sa->nr);
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for (i = 0; i < sa->nr; i++) {
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if (has_sha1_file(sa->sha1[i])) {
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struct commit_graft *graft;
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graft = lookup_commit_graft(sa->sha1[i]);
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if (graft && graft->nr_parent < 0)
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continue;
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info->ours[info->nr_ours++] = i;
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} else
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info->theirs[info->nr_theirs++] = i;
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}
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}
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void clear_shallow_info(struct shallow_info *info)
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{
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free(info->ours);
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free(info->theirs);
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}
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/* Step 4, remove non-existent ones in "theirs" after getting the pack */
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void remove_nonexistent_theirs_shallow(struct shallow_info *info)
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{
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unsigned char (*sha1)[20] = info->shallow->sha1;
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int i, dst;
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trace_printf_key(TRACE_KEY, "shallow: remove_nonexistent_theirs_shallow\n");
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for (i = dst = 0; i < info->nr_theirs; i++) {
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if (i != dst)
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info->theirs[dst] = info->theirs[i];
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if (has_sha1_file(sha1[info->theirs[i]]))
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dst++;
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}
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info->nr_theirs = dst;
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}
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define_commit_slab(ref_bitmap, uint32_t *);
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struct paint_info {
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struct ref_bitmap ref_bitmap;
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unsigned nr_bits;
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char **slab;
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char *free, *end;
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unsigned slab_count;
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};
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static uint32_t *paint_alloc(struct paint_info *info)
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{
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unsigned nr = (info->nr_bits + 31) / 32;
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unsigned size = nr * sizeof(uint32_t);
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void *p;
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if (!info->slab_count || info->free + size > info->end) {
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info->slab_count++;
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info->slab = xrealloc(info->slab,
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info->slab_count * sizeof(*info->slab));
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info->free = xmalloc(COMMIT_SLAB_SIZE);
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info->slab[info->slab_count - 1] = info->free;
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info->end = info->free + COMMIT_SLAB_SIZE;
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}
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p = info->free;
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info->free += size;
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return p;
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}
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/*
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* Given a commit SHA-1, walk down to parents until either SEEN,
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* UNINTERESTING or BOTTOM is hit. Set the id-th bit in ref_bitmap for
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* all walked commits.
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*/
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static void paint_down(struct paint_info *info, const unsigned char *sha1,
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int id)
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{
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unsigned int i, nr;
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struct commit_list *head = NULL;
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int bitmap_nr = (info->nr_bits + 31) / 32;
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int bitmap_size = bitmap_nr * sizeof(uint32_t);
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uint32_t *tmp = xmalloc(bitmap_size); /* to be freed before return */
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uint32_t *bitmap = paint_alloc(info);
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struct commit *c = lookup_commit_reference_gently(sha1, 1);
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if (!c)
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return;
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memset(bitmap, 0, bitmap_size);
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bitmap[id / 32] |= (1 << (id % 32));
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commit_list_insert(c, &head);
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while (head) {
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struct commit_list *p;
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struct commit *c = head->item;
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uint32_t **refs = ref_bitmap_at(&info->ref_bitmap, c);
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p = head;
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head = head->next;
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free(p);
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/* XXX check "UNINTERESTING" from pack bitmaps if available */
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if (c->object.flags & (SEEN | UNINTERESTING))
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continue;
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else
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c->object.flags |= SEEN;
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if (*refs == NULL)
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*refs = bitmap;
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else {
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memcpy(tmp, *refs, bitmap_size);
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for (i = 0; i < bitmap_nr; i++)
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tmp[i] |= bitmap[i];
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if (memcmp(tmp, *refs, bitmap_size)) {
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*refs = paint_alloc(info);
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memcpy(*refs, tmp, bitmap_size);
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}
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}
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if (c->object.flags & BOTTOM)
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continue;
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if (parse_commit(c))
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die("unable to parse commit %s",
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sha1_to_hex(c->object.sha1));
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for (p = c->parents; p; p = p->next) {
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uint32_t **p_refs = ref_bitmap_at(&info->ref_bitmap,
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p->item);
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if (p->item->object.flags & SEEN)
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continue;
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if (*p_refs == NULL || *p_refs == *refs)
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*p_refs = *refs;
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commit_list_insert(p->item, &head);
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}
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}
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nr = get_max_object_index();
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for (i = 0; i < nr; i++) {
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struct object *o = get_indexed_object(i);
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if (o && o->type == OBJ_COMMIT)
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o->flags &= ~SEEN;
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}
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free(tmp);
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}
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static int mark_uninteresting(const char *refname,
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const unsigned char *sha1,
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int flags, void *cb_data)
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{
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struct commit *commit = lookup_commit_reference_gently(sha1, 1);
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if (!commit)
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return 0;
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commit->object.flags |= UNINTERESTING;
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mark_parents_uninteresting(commit);
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return 0;
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}
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static void post_assign_shallow(struct shallow_info *info,
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struct ref_bitmap *ref_bitmap,
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int *ref_status);
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/*
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* Step 6(+7), associate shallow commits with new refs
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*
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* info->ref must be initialized before calling this function.
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*
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* If used is not NULL, it's an array of info->shallow->nr
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* bitmaps. The n-th bit set in the m-th bitmap if ref[n] needs the
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* m-th shallow commit from info->shallow.
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|
*
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* If used is NULL, "ours" and "theirs" are updated. And if ref_status
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|
* is not NULL it's an array of ref->nr ints. ref_status[i] is true if
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|
* the ref needs some shallow commits from either info->ours or
|
|
* info->theirs.
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|
*/
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|
void assign_shallow_commits_to_refs(struct shallow_info *info,
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|
uint32_t **used, int *ref_status)
|
|
{
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|
unsigned char (*sha1)[20] = info->shallow->sha1;
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|
struct sha1_array *ref = info->ref;
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|
unsigned int i, nr;
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|
int *shallow, nr_shallow = 0;
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|
struct paint_info pi;
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|
|
|
trace_printf_key(TRACE_KEY, "shallow: assign_shallow_commits_to_refs\n");
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|
shallow = xmalloc(sizeof(*shallow) * (info->nr_ours + info->nr_theirs));
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|
for (i = 0; i < info->nr_ours; i++)
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|
shallow[nr_shallow++] = info->ours[i];
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|
for (i = 0; i < info->nr_theirs; i++)
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|
shallow[nr_shallow++] = info->theirs[i];
|
|
|
|
/*
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|
* Prepare the commit graph to track what refs can reach what
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|
* (new) shallow commits.
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|
*/
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|
nr = get_max_object_index();
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|
for (i = 0; i < nr; i++) {
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|
struct object *o = get_indexed_object(i);
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|
if (!o || o->type != OBJ_COMMIT)
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|
continue;
|
|
|
|
o->flags &= ~(UNINTERESTING | BOTTOM | SEEN);
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|
}
|
|
|
|
memset(&pi, 0, sizeof(pi));
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|
init_ref_bitmap(&pi.ref_bitmap);
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|
pi.nr_bits = ref->nr;
|
|
|
|
/*
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|
* "--not --all" to cut short the traversal if new refs
|
|
* connect to old refs. If not (e.g. force ref updates) it'll
|
|
* have to go down to the current shallow commits.
|
|
*/
|
|
head_ref(mark_uninteresting, NULL);
|
|
for_each_ref(mark_uninteresting, NULL);
|
|
|
|
/* Mark potential bottoms so we won't go out of bound */
|
|
for (i = 0; i < nr_shallow; i++) {
|
|
struct commit *c = lookup_commit(sha1[shallow[i]]);
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|
c->object.flags |= BOTTOM;
|
|
}
|
|
|
|
for (i = 0; i < ref->nr; i++)
|
|
paint_down(&pi, ref->sha1[i], i);
|
|
|
|
if (used) {
|
|
int bitmap_size = ((pi.nr_bits + 31) / 32) * sizeof(uint32_t);
|
|
memset(used, 0, sizeof(*used) * info->shallow->nr);
|
|
for (i = 0; i < nr_shallow; i++) {
|
|
const struct commit *c = lookup_commit(sha1[shallow[i]]);
|
|
uint32_t **map = ref_bitmap_at(&pi.ref_bitmap, c);
|
|
if (*map)
|
|
used[shallow[i]] = xmemdupz(*map, bitmap_size);
|
|
}
|
|
/*
|
|
* unreachable shallow commits are not removed from
|
|
* "ours" and "theirs". The user is supposed to run
|
|
* step 7 on every ref separately and not trust "ours"
|
|
* and "theirs" any more.
|
|
*/
|
|
} else
|
|
post_assign_shallow(info, &pi.ref_bitmap, ref_status);
|
|
|
|
clear_ref_bitmap(&pi.ref_bitmap);
|
|
for (i = 0; i < pi.slab_count; i++)
|
|
free(pi.slab[i]);
|
|
free(pi.slab);
|
|
free(shallow);
|
|
}
|
|
|
|
struct commit_array {
|
|
struct commit **commits;
|
|
int nr, alloc;
|
|
};
|
|
|
|
static int add_ref(const char *refname,
|
|
const unsigned char *sha1, int flags, void *cb_data)
|
|
{
|
|
struct commit_array *ca = cb_data;
|
|
ALLOC_GROW(ca->commits, ca->nr + 1, ca->alloc);
|
|
ca->commits[ca->nr] = lookup_commit_reference_gently(sha1, 1);
|
|
if (ca->commits[ca->nr])
|
|
ca->nr++;
|
|
return 0;
|
|
}
|
|
|
|
static void update_refstatus(int *ref_status, int nr, uint32_t *bitmap)
|
|
{
|
|
int i;
|
|
if (!ref_status)
|
|
return;
|
|
for (i = 0; i < nr; i++)
|
|
if (bitmap[i / 32] & (1 << (i % 32)))
|
|
ref_status[i]++;
|
|
}
|
|
|
|
/*
|
|
* Step 7, reachability test on "ours" at commit level
|
|
*/
|
|
static void post_assign_shallow(struct shallow_info *info,
|
|
struct ref_bitmap *ref_bitmap,
|
|
int *ref_status)
|
|
{
|
|
unsigned char (*sha1)[20] = info->shallow->sha1;
|
|
struct commit *c;
|
|
uint32_t **bitmap;
|
|
int dst, i, j;
|
|
int bitmap_nr = (info->ref->nr + 31) / 32;
|
|
struct commit_array ca;
|
|
|
|
trace_printf_key(TRACE_KEY, "shallow: post_assign_shallow\n");
|
|
if (ref_status)
|
|
memset(ref_status, 0, sizeof(*ref_status) * info->ref->nr);
|
|
|
|
/* Remove unreachable shallow commits from "theirs" */
|
|
for (i = dst = 0; i < info->nr_theirs; i++) {
|
|
if (i != dst)
|
|
info->theirs[dst] = info->theirs[i];
|
|
c = lookup_commit(sha1[info->theirs[i]]);
|
|
bitmap = ref_bitmap_at(ref_bitmap, c);
|
|
if (!*bitmap)
|
|
continue;
|
|
for (j = 0; j < bitmap_nr; j++)
|
|
if (bitmap[0][j]) {
|
|
update_refstatus(ref_status, info->ref->nr, *bitmap);
|
|
dst++;
|
|
break;
|
|
}
|
|
}
|
|
info->nr_theirs = dst;
|
|
|
|
memset(&ca, 0, sizeof(ca));
|
|
head_ref(add_ref, &ca);
|
|
for_each_ref(add_ref, &ca);
|
|
|
|
/* Remove unreachable shallow commits from "ours" */
|
|
for (i = dst = 0; i < info->nr_ours; i++) {
|
|
if (i != dst)
|
|
info->ours[dst] = info->ours[i];
|
|
c = lookup_commit(sha1[info->ours[i]]);
|
|
bitmap = ref_bitmap_at(ref_bitmap, c);
|
|
if (!*bitmap)
|
|
continue;
|
|
for (j = 0; j < bitmap_nr; j++)
|
|
if (bitmap[0][j] &&
|
|
/* Step 7, reachability test at commit level */
|
|
!in_merge_bases_many(c, ca.nr, ca.commits)) {
|
|
update_refstatus(ref_status, info->ref->nr, *bitmap);
|
|
dst++;
|
|
break;
|
|
}
|
|
}
|
|
info->nr_ours = dst;
|
|
|
|
free(ca.commits);
|
|
}
|
|
|
|
/* (Delayed) step 7, reachability test at commit level */
|
|
int delayed_reachability_test(struct shallow_info *si, int c)
|
|
{
|
|
if (si->need_reachability_test[c]) {
|
|
struct commit *commit = lookup_commit(si->shallow->sha1[c]);
|
|
|
|
if (!si->commits) {
|
|
struct commit_array ca;
|
|
memset(&ca, 0, sizeof(ca));
|
|
head_ref(add_ref, &ca);
|
|
for_each_ref(add_ref, &ca);
|
|
si->commits = ca.commits;
|
|
si->nr_commits = ca.nr;
|
|
}
|
|
|
|
si->reachable[c] = in_merge_bases_many(commit,
|
|
si->nr_commits,
|
|
si->commits);
|
|
si->need_reachability_test[c] = 0;
|
|
}
|
|
return si->reachable[c];
|
|
}
|