mirror of
https://github.com/git/git.git
synced 2024-10-31 06:17:56 +01:00
c2bf473d0d
The git-prune command checks reachability by doing a traversal, and then checking whether a given object exists in the global object hash. This can yield false positives if any other part of the code had to create an object struct for some reason. It's not clear whether this is even possible, but it's more robust to rely on something a little more concrete: the SEEN flag set by our traversal. Note that there is a slight possibility of regression here, as we're relying on mark_reachable_objects() to consistently set the flag. However, it has always done so, and we're already relying on that fact in prune_shallow(), which is called as part of git-prune. So this is making these two parts of the prune operation more consistent. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
187 lines
4.5 KiB
C
187 lines
4.5 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "diff.h"
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#include "revision.h"
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#include "builtin.h"
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#include "reachable.h"
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#include "parse-options.h"
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#include "progress.h"
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#include "object-store.h"
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static const char * const prune_usage[] = {
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N_("git prune [-n] [-v] [--progress] [--expire <time>] [--] [<head>...]"),
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NULL
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};
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static int show_only;
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static int verbose;
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static timestamp_t expire;
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static int show_progress = -1;
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static int prune_tmp_file(const char *fullpath)
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{
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struct stat st;
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if (lstat(fullpath, &st))
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return error("Could not stat '%s'", fullpath);
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if (st.st_mtime > expire)
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return 0;
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if (show_only || verbose)
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printf("Removing stale temporary file %s\n", fullpath);
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if (!show_only)
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unlink_or_warn(fullpath);
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return 0;
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}
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static void perform_reachability_traversal(struct rev_info *revs)
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{
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static int initialized;
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struct progress *progress = NULL;
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if (initialized)
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return;
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if (show_progress)
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progress = start_delayed_progress(_("Checking connectivity"), 0);
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mark_reachable_objects(revs, 1, expire, progress);
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stop_progress(&progress);
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initialized = 1;
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}
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static int is_object_reachable(const struct object_id *oid,
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struct rev_info *revs)
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{
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struct object *obj;
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perform_reachability_traversal(revs);
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obj = lookup_object(the_repository, oid->hash);
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return obj && (obj->flags & SEEN);
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}
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static int prune_object(const struct object_id *oid, const char *fullpath,
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void *data)
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{
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struct rev_info *revs = data;
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struct stat st;
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if (is_object_reachable(oid, revs))
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return 0;
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if (lstat(fullpath, &st)) {
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/* report errors, but do not stop pruning */
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error("Could not stat '%s'", fullpath);
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return 0;
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}
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if (st.st_mtime > expire)
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return 0;
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if (show_only || verbose) {
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enum object_type type = oid_object_info(the_repository, oid,
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NULL);
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printf("%s %s\n", oid_to_hex(oid),
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(type > 0) ? type_name(type) : "unknown");
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}
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if (!show_only)
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unlink_or_warn(fullpath);
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return 0;
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}
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static int prune_cruft(const char *basename, const char *path, void *data)
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{
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if (starts_with(basename, "tmp_obj_"))
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prune_tmp_file(path);
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else
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fprintf(stderr, "bad sha1 file: %s\n", path);
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return 0;
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}
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static int prune_subdir(unsigned int nr, const char *path, void *data)
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{
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if (!show_only)
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rmdir(path);
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return 0;
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}
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/*
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* Write errors (particularly out of space) can result in
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* failed temporary packs (and more rarely indexes and other
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* files beginning with "tmp_") accumulating in the object
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* and the pack directories.
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*/
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static void remove_temporary_files(const char *path)
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{
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DIR *dir;
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struct dirent *de;
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dir = opendir(path);
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if (!dir) {
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fprintf(stderr, "Unable to open directory %s\n", path);
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return;
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}
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while ((de = readdir(dir)) != NULL)
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if (starts_with(de->d_name, "tmp_"))
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prune_tmp_file(mkpath("%s/%s", path, de->d_name));
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closedir(dir);
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}
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int cmd_prune(int argc, const char **argv, const char *prefix)
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{
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struct rev_info revs;
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int exclude_promisor_objects = 0;
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const struct option options[] = {
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OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
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OPT__VERBOSE(&verbose, N_("report pruned objects")),
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OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
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OPT_EXPIRY_DATE(0, "expire", &expire,
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N_("expire objects older than <time>")),
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OPT_BOOL(0, "exclude-promisor-objects", &exclude_promisor_objects,
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N_("limit traversal to objects outside promisor packfiles")),
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OPT_END()
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};
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char *s;
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expire = TIME_MAX;
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save_commit_buffer = 0;
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read_replace_refs = 0;
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ref_paranoia = 1;
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repo_init_revisions(the_repository, &revs, prefix);
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argc = parse_options(argc, argv, prefix, options, prune_usage, 0);
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if (repository_format_precious_objects)
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die(_("cannot prune in a precious-objects repo"));
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while (argc--) {
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struct object_id oid;
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const char *name = *argv++;
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if (!get_oid(name, &oid)) {
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struct object *object = parse_object_or_die(&oid,
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name);
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add_pending_object(&revs, object, "");
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}
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else
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die("unrecognized argument: %s", name);
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}
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if (show_progress == -1)
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show_progress = isatty(2);
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if (exclude_promisor_objects) {
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fetch_if_missing = 0;
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revs.exclude_promisor_objects = 1;
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}
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for_each_loose_file_in_objdir(get_object_directory(), prune_object,
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prune_cruft, prune_subdir, &revs);
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prune_packed_objects(show_only ? PRUNE_PACKED_DRY_RUN : 0);
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remove_temporary_files(get_object_directory());
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s = mkpathdup("%s/pack", get_object_directory());
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remove_temporary_files(s);
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free(s);
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if (is_repository_shallow(the_repository)) {
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perform_reachability_traversal(&revs);
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prune_shallow(show_only ? PRUNE_SHOW_ONLY : 0);
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}
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return 0;
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}
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