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synced 2024-08-28 20:20:07 +00:00
![Jeff King](/assets/img/avatar_default.png)
One of the most common uses of git_path() is to pass a constant, like git_path("MERGE_MSG"). This has two drawbacks: 1. The return value is a static buffer, and the lifetime is dependent on other calls to git_path, etc. 2. There's no compile-time checking of the pathname. This is OK for a one-off (after all, we have to spell it correctly at least once), but many of these constant strings appear throughout the code. This patch introduces a series of functions to "memoize" these strings, which are essentially globals for the lifetime of the program. We compute the value once, take ownership of the buffer, and return the cached value for subsequent calls. cache.h provides a helper macro for defining these functions as one-liners, and defines a few common ones for global use. Using a macro is a little bit gross, but it does nicely document the purpose of the functions. If we need to touch them all later (e.g., because we learned how to change the git_dir variable at runtime, and need to invalidate all of the stored values), it will be much easier to have the complete list. Note that the shared-global functions have separate, manual declarations. We could do something clever with the macros (e.g., expand it to a declaration in some places, and a declaration _and_ a definition in path.c). But there aren't that many, and it's probably better to stay away from too-magical macros. Likewise, if we abandon the C preprocessor in favor of generating these with a script, we could get much fancier. E.g., normalizing "FOO/BAR-BAZ" into "git_path_foo_bar_baz". But the small amount of saved typing is probably not worth the resulting confusion to readers who want to grep for the function's definition. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
691 lines
18 KiB
C
691 lines
18 KiB
C
#include "cache.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 "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 = xstrdup_or_null(path);
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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->oid.hash, 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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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.hash);
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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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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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atexit(remove_temporary_shallow);
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sigchain_push_common(remove_temporary_shallow_on_signal);
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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.buf);
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*alternate_shallow_file = shallow_lock->filename.buf;
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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", 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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shallow_lock.filename.buf);
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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 sha1_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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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_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_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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REALLOC_ARRAY(info->slab, info->slab_count);
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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, const struct object_id *oid,
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int flags, void *cb_data)
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{
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struct commit *commit = lookup_commit_reference_gently(oid->hash, 1);
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if (!commit)
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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)
|
|
{
|
|
unsigned char (*sha1)[20] = info->shallow->sha1;
|
|
struct sha1_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");
|
|
shallow = xmalloc(sizeof(*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(sha1[shallow[i]]);
|
|
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 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->hash, 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_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(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];
|
|
}
|