mirror of
https://github.com/git/git
synced 2024-08-27 19:49:21 +00:00
748 lines
19 KiB
C
748 lines
19 KiB
C
#include "cache.h"
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#include "tempfile.h"
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#include "lockfile.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 "revision.h"
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#include "list-objects.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 = xstrdup_or_null(path);
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}
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int register_shallow(const struct object_id *oid)
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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(oid);
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oidcpy(&graft->oid, oid);
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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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struct object_id oid;
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if (get_oid_hex(buf, &oid))
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die("bad shallow line: %s", buf);
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register_shallow(&oid);
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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.oid.hash)) != 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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static void show_commit(struct commit *commit, void *data)
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{
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commit_list_insert(commit, data);
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}
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/*
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* Given rev-list arguments, run rev-list. All reachable commits
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* except border ones are marked with not_shallow_flag. Border commits
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* are marked with shallow_flag. The list of border/shallow commits
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* are also returned.
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*/
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struct commit_list *get_shallow_commits_by_rev_list(int ac, const char **av,
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int shallow_flag,
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int not_shallow_flag)
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{
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struct commit_list *result = NULL, *p;
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struct commit_list *not_shallow_list = NULL;
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struct rev_info revs;
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int both_flags = shallow_flag | not_shallow_flag;
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/*
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* SHALLOW (excluded) and NOT_SHALLOW (included) should not be
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* set at this point. But better be safe than sorry.
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*/
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clear_object_flags(both_flags);
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is_repository_shallow(); /* make sure shallows are read */
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init_revisions(&revs, NULL);
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save_commit_buffer = 0;
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setup_revisions(ac, av, &revs, NULL);
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if (prepare_revision_walk(&revs))
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die("revision walk setup failed");
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traverse_commit_list(&revs, show_commit, NULL, ¬_shallow_list);
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/* Mark all reachable commits as NOT_SHALLOW */
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for (p = not_shallow_list; p; p = p->next)
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p->item->object.flags |= not_shallow_flag;
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/*
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* mark border commits SHALLOW + NOT_SHALLOW.
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* We cannot clear NOT_SHALLOW right now. Imagine border
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* commit A is processed first, then commit B, whose parent is
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* A, later. If NOT_SHALLOW on A is cleared at step 1, B
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* itself is considered border at step 2, which is incorrect.
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*/
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for (p = not_shallow_list; p; p = p->next) {
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struct commit *c = p->item;
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struct commit_list *parent;
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if (parse_commit(c))
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die("unable to parse commit %s",
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oid_to_hex(&c->object.oid));
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for (parent = c->parents; parent; parent = parent->next)
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if (!(parent->item->object.flags & not_shallow_flag)) {
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c->object.flags |= shallow_flag;
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commit_list_insert(c, &result);
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break;
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}
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}
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free_commit_list(not_shallow_list);
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/*
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* Now we can clean up NOT_SHALLOW on border commits. Having
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* both flags set can confuse the caller.
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*/
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for (p = result; p; p = p->next) {
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struct object *o = &p->item->object;
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if ((o->flags & both_flags) == both_flags)
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o->flags &= ~not_shallow_flag;
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}
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return result;
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}
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static 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 = oid_to_hex(&graft->oid);
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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->oid);
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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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oid_to_hex(&c->object.oid));
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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 oid_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, oid_to_hex(extra->oid + 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 oid_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 tempfile temporary_shallow;
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const char *setup_temporary_shallow(const struct oid_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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if (write_shallow_commits(&sb, 0, extra)) {
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fd = xmks_tempfile(&temporary_shallow, git_path("shallow_XXXXXX"));
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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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get_tempfile_path(&temporary_shallow));
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close_tempfile(&temporary_shallow);
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strbuf_release(&sb);
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return get_tempfile_path(&temporary_shallow);
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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 get_tempfile_path(&temporary_shallow);
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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 oid_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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get_lock_file_path(shallow_lock));
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*alternate_shallow_file = get_lock_file_path(shallow_lock);
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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_fmt(fd, "shallow %s\n", oid_to_hex(&graft->oid));
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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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get_lock_file_path(&shallow_lock));
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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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struct trace_key trace_shallow = TRACE_KEY_INIT(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 oid_array *sa)
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{
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int i;
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trace_printf_key(&trace_shallow, "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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ALLOC_ARRAY(info->ours, sa->nr);
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ALLOC_ARRAY(info->theirs, sa->nr);
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for (i = 0; i < sa->nr; i++) {
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if (has_object_file(sa->oid + i)) {
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struct commit_graft *graft;
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graft = lookup_commit_graft(sa->oid[i].hash);
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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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struct object_id *oid = info->shallow->oid;
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int i, dst;
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trace_printf_key(&trace_shallow, "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_object_file(oid + 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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#define POOL_SIZE (512 * 1024)
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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 **pools;
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char *free, *end;
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unsigned pool_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 = DIV_ROUND_UP(info->nr_bits, 32);
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unsigned size = nr * sizeof(uint32_t);
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void *p;
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if (!info->pool_count || size > info->end - info->free) {
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if (size > POOL_SIZE)
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die("BUG: pool size too small for %d in paint_alloc()",
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size);
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info->pool_count++;
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REALLOC_ARRAY(info->pools, info->pool_count);
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info->free = xmalloc(POOL_SIZE);
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info->pools[info->pool_count - 1] = info->free;
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info->end = info->free + POOL_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 struct object_id *oid,
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unsigned 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 = DIV_ROUND_UP(info->nr_bits, 32);
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size_t bitmap_size = st_mult(sizeof(uint32_t), bitmap_nr);
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struct commit *c = lookup_commit_reference_gently(oid, 1);
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uint32_t *tmp; /* to be freed before return */
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uint32_t *bitmap;
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if (!c)
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return;
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tmp = xmalloc(bitmap_size);
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bitmap = paint_alloc(info);
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memset(bitmap, 0, bitmap_size);
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bitmap[id / 32] |= (1U << (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 = pop_commit(&head);
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uint32_t **refs = ref_bitmap_at(&info->ref_bitmap, c);
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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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|
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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)) {
|
|
*refs = paint_alloc(info);
|
|
memcpy(*refs, tmp, bitmap_size);
|
|
}
|
|
}
|
|
|
|
if (c->object.flags & BOTTOM)
|
|
continue;
|
|
|
|
if (parse_commit(c))
|
|
die("unable to parse commit %s",
|
|
oid_to_hex(&c->object.oid));
|
|
|
|
for (p = c->parents; p; p = p->next) {
|
|
if (p->item->object.flags & SEEN)
|
|
continue;
|
|
commit_list_insert(p->item, &head);
|
|
}
|
|
}
|
|
|
|
nr = get_max_object_index();
|
|
for (i = 0; i < nr; i++) {
|
|
struct object *o = get_indexed_object(i);
|
|
if (o && o->type == OBJ_COMMIT)
|
|
o->flags &= ~SEEN;
|
|
}
|
|
|
|
free(tmp);
|
|
}
|
|
|
|
static int mark_uninteresting(const char *refname, const struct object_id *oid,
|
|
int flags, void *cb_data)
|
|
{
|
|
struct commit *commit = lookup_commit_reference_gently(oid, 1);
|
|
if (!commit)
|
|
return 0;
|
|
commit->object.flags |= UNINTERESTING;
|
|
mark_parents_uninteresting(commit);
|
|
return 0;
|
|
}
|
|
|
|
static void post_assign_shallow(struct shallow_info *info,
|
|
struct ref_bitmap *ref_bitmap,
|
|
int *ref_status);
|
|
/*
|
|
* Step 6(+7), associate shallow commits with new refs
|
|
*
|
|
* info->ref must be initialized before calling this function.
|
|
*
|
|
* If used is not NULL, it's an array of info->shallow->nr
|
|
* bitmaps. The n-th bit set in the m-th bitmap if ref[n] needs the
|
|
* m-th shallow commit from info->shallow.
|
|
*
|
|
* If used is NULL, "ours" and "theirs" are updated. And if ref_status
|
|
* is not NULL it's an array of ref->nr ints. ref_status[i] is true if
|
|
* the ref needs some shallow commits from either info->ours or
|
|
* info->theirs.
|
|
*/
|
|
void assign_shallow_commits_to_refs(struct shallow_info *info,
|
|
uint32_t **used, int *ref_status)
|
|
{
|
|
struct object_id *oid = info->shallow->oid;
|
|
struct oid_array *ref = info->ref;
|
|
unsigned int i, nr;
|
|
int *shallow, nr_shallow = 0;
|
|
struct paint_info pi;
|
|
|
|
trace_printf_key(&trace_shallow, "shallow: assign_shallow_commits_to_refs\n");
|
|
ALLOC_ARRAY(shallow, info->nr_ours + info->nr_theirs);
|
|
for (i = 0; i < info->nr_ours; i++)
|
|
shallow[nr_shallow++] = info->ours[i];
|
|
for (i = 0; i < info->nr_theirs; i++)
|
|
shallow[nr_shallow++] = info->theirs[i];
|
|
|
|
/*
|
|
* Prepare the commit graph to track what refs can reach what
|
|
* (new) shallow commits.
|
|
*/
|
|
nr = get_max_object_index();
|
|
for (i = 0; i < nr; i++) {
|
|
struct object *o = get_indexed_object(i);
|
|
if (!o || o->type != OBJ_COMMIT)
|
|
continue;
|
|
|
|
o->flags &= ~(UNINTERESTING | BOTTOM | SEEN);
|
|
}
|
|
|
|
memset(&pi, 0, sizeof(pi));
|
|
init_ref_bitmap(&pi.ref_bitmap);
|
|
pi.nr_bits = ref->nr;
|
|
|
|
/*
|
|
* "--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(&oid[shallow[i]]);
|
|
c->object.flags |= BOTTOM;
|
|
}
|
|
|
|
for (i = 0; i < ref->nr; i++)
|
|
paint_down(&pi, ref->oid + i, i);
|
|
|
|
if (used) {
|
|
int bitmap_size = DIV_ROUND_UP(pi.nr_bits, 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(&oid[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.pool_count; i++)
|
|
free(pi.pools[i]);
|
|
free(pi.pools);
|
|
free(shallow);
|
|
}
|
|
|
|
struct commit_array {
|
|
struct commit **commits;
|
|
int nr, alloc;
|
|
};
|
|
|
|
static int add_ref(const char *refname, const struct object_id *oid,
|
|
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(oid, 1);
|
|
if (ca->commits[ca->nr])
|
|
ca->nr++;
|
|
return 0;
|
|
}
|
|
|
|
static void update_refstatus(int *ref_status, int nr, uint32_t *bitmap)
|
|
{
|
|
unsigned int i;
|
|
if (!ref_status)
|
|
return;
|
|
for (i = 0; i < nr; i++)
|
|
if (bitmap[i / 32] & (1U << (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)
|
|
{
|
|
struct object_id *oid = info->shallow->oid;
|
|
struct commit *c;
|
|
uint32_t **bitmap;
|
|
int dst, i, j;
|
|
int bitmap_nr = DIV_ROUND_UP(info->ref->nr, 32);
|
|
struct commit_array ca;
|
|
|
|
trace_printf_key(&trace_shallow, "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(&oid[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(&oid[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->oid[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];
|
|
}
|