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https://github.com/git/git
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ed7eda8b38
Since 64a99eb4
git gc refuses to run without the --force option if
another gc process on the same repository is already running.
However, if the repository is shared and user A runs git gc on the
repository and while that gc is still running user B runs git gc on
the same repository the gc process run by user A will not be noticed
and the gc run by user B will go ahead and run.
The problem is that the kill(pid, 0) test fails with an EPERM error
since user B is not allowed to signal processes owned by user A
(unless user B is root).
Update the test to recognize an EPERM error as meaning the process
exists and another gc should not be run (unless --force is given).
Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
344 lines
8.5 KiB
C
344 lines
8.5 KiB
C
/*
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* git gc builtin command
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*
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* Cleanup unreachable files and optimize the repository.
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*
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* Copyright (c) 2007 James Bowes
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*
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* Based on git-gc.sh, which is
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*
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* Copyright (c) 2006 Shawn O. Pearce
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*/
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#include "builtin.h"
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#include "cache.h"
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#include "parse-options.h"
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#include "run-command.h"
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#include "sigchain.h"
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#include "argv-array.h"
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#define FAILED_RUN "failed to run %s"
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static const char * const builtin_gc_usage[] = {
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N_("git gc [options]"),
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NULL
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};
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static int pack_refs = 1;
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static int aggressive_window = 250;
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static int gc_auto_threshold = 6700;
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static int gc_auto_pack_limit = 50;
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static const char *prune_expire = "2.weeks.ago";
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static struct argv_array pack_refs_cmd = ARGV_ARRAY_INIT;
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static struct argv_array reflog = ARGV_ARRAY_INIT;
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static struct argv_array repack = ARGV_ARRAY_INIT;
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static struct argv_array prune = ARGV_ARRAY_INIT;
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static struct argv_array rerere = ARGV_ARRAY_INIT;
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static char *pidfile;
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static void remove_pidfile(void)
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{
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if (pidfile)
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unlink(pidfile);
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}
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static void remove_pidfile_on_signal(int signo)
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{
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remove_pidfile();
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sigchain_pop(signo);
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raise(signo);
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}
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static int gc_config(const char *var, const char *value, void *cb)
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{
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if (!strcmp(var, "gc.packrefs")) {
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if (value && !strcmp(value, "notbare"))
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pack_refs = -1;
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else
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pack_refs = git_config_bool(var, value);
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return 0;
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}
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if (!strcmp(var, "gc.aggressivewindow")) {
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aggressive_window = git_config_int(var, value);
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return 0;
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}
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if (!strcmp(var, "gc.auto")) {
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gc_auto_threshold = git_config_int(var, value);
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return 0;
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}
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if (!strcmp(var, "gc.autopacklimit")) {
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gc_auto_pack_limit = git_config_int(var, value);
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return 0;
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}
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if (!strcmp(var, "gc.pruneexpire")) {
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if (value && strcmp(value, "now")) {
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unsigned long now = approxidate("now");
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if (approxidate(value) >= now)
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return error(_("Invalid %s: '%s'"), var, value);
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}
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return git_config_string(&prune_expire, var, value);
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}
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return git_default_config(var, value, cb);
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}
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static int too_many_loose_objects(void)
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{
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/*
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* Quickly check if a "gc" is needed, by estimating how
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* many loose objects there are. Because SHA-1 is evenly
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* distributed, we can check only one and get a reasonable
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* estimate.
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*/
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char path[PATH_MAX];
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const char *objdir = get_object_directory();
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DIR *dir;
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struct dirent *ent;
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int auto_threshold;
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int num_loose = 0;
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int needed = 0;
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if (gc_auto_threshold <= 0)
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return 0;
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if (sizeof(path) <= snprintf(path, sizeof(path), "%s/17", objdir)) {
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warning(_("insanely long object directory %.*s"), 50, objdir);
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return 0;
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}
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dir = opendir(path);
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if (!dir)
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return 0;
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auto_threshold = (gc_auto_threshold + 255) / 256;
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while ((ent = readdir(dir)) != NULL) {
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if (strspn(ent->d_name, "0123456789abcdef") != 38 ||
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ent->d_name[38] != '\0')
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continue;
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if (++num_loose > auto_threshold) {
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needed = 1;
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break;
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}
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}
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closedir(dir);
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return needed;
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}
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static int too_many_packs(void)
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{
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struct packed_git *p;
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int cnt;
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if (gc_auto_pack_limit <= 0)
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return 0;
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prepare_packed_git();
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for (cnt = 0, p = packed_git; p; p = p->next) {
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if (!p->pack_local)
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continue;
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if (p->pack_keep)
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continue;
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/*
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* Perhaps check the size of the pack and count only
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* very small ones here?
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*/
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cnt++;
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}
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return gc_auto_pack_limit <= cnt;
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}
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static void add_repack_all_option(void)
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{
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if (prune_expire && !strcmp(prune_expire, "now"))
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argv_array_push(&repack, "-a");
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else {
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argv_array_push(&repack, "-A");
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if (prune_expire)
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argv_array_pushf(&repack, "--unpack-unreachable=%s", prune_expire);
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}
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}
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static int need_to_gc(void)
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{
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/*
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* Setting gc.auto to 0 or negative can disable the
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* automatic gc.
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*/
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if (gc_auto_threshold <= 0)
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return 0;
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/*
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* If there are too many loose objects, but not too many
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* packs, we run "repack -d -l". If there are too many packs,
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* we run "repack -A -d -l". Otherwise we tell the caller
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* there is no need.
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*/
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if (too_many_packs())
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add_repack_all_option();
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else if (!too_many_loose_objects())
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return 0;
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if (run_hook(NULL, "pre-auto-gc", NULL))
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return 0;
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return 1;
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}
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/* return NULL on success, else hostname running the gc */
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static const char *lock_repo_for_gc(int force, pid_t* ret_pid)
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{
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static struct lock_file lock;
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static char locking_host[128];
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char my_host[128];
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struct strbuf sb = STRBUF_INIT;
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struct stat st;
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uintmax_t pid;
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FILE *fp;
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int fd, should_exit;
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if (pidfile)
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/* already locked */
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return NULL;
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if (gethostname(my_host, sizeof(my_host)))
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strcpy(my_host, "unknown");
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fd = hold_lock_file_for_update(&lock, git_path("gc.pid"),
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LOCK_DIE_ON_ERROR);
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if (!force) {
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fp = fopen(git_path("gc.pid"), "r");
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memset(locking_host, 0, sizeof(locking_host));
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should_exit =
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fp != NULL &&
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!fstat(fileno(fp), &st) &&
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/*
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* 12 hour limit is very generous as gc should
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* never take that long. On the other hand we
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* don't really need a strict limit here,
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* running gc --auto one day late is not a big
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* problem. --force can be used in manual gc
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* after the user verifies that no gc is
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* running.
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*/
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time(NULL) - st.st_mtime <= 12 * 3600 &&
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fscanf(fp, "%"PRIuMAX" %127c", &pid, locking_host) == 2 &&
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/* be gentle to concurrent "gc" on remote hosts */
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(strcmp(locking_host, my_host) || !kill(pid, 0) || errno == EPERM);
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if (fp != NULL)
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fclose(fp);
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if (should_exit) {
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if (fd >= 0)
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rollback_lock_file(&lock);
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*ret_pid = pid;
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return locking_host;
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}
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}
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strbuf_addf(&sb, "%"PRIuMAX" %s",
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(uintmax_t) getpid(), my_host);
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write_in_full(fd, sb.buf, sb.len);
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strbuf_release(&sb);
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commit_lock_file(&lock);
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pidfile = git_pathdup("gc.pid");
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sigchain_push_common(remove_pidfile_on_signal);
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atexit(remove_pidfile);
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return NULL;
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}
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int cmd_gc(int argc, const char **argv, const char *prefix)
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{
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int aggressive = 0;
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int auto_gc = 0;
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int quiet = 0;
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int force = 0;
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const char *name;
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pid_t pid;
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struct option builtin_gc_options[] = {
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OPT__QUIET(&quiet, N_("suppress progress reporting")),
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{ OPTION_STRING, 0, "prune", &prune_expire, N_("date"),
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N_("prune unreferenced objects"),
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PARSE_OPT_OPTARG, NULL, (intptr_t)prune_expire },
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OPT_BOOL(0, "aggressive", &aggressive, N_("be more thorough (increased runtime)")),
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OPT_BOOL(0, "auto", &auto_gc, N_("enable auto-gc mode")),
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OPT_BOOL(0, "force", &force, N_("force running gc even if there may be another gc running")),
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OPT_END()
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};
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if (argc == 2 && !strcmp(argv[1], "-h"))
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usage_with_options(builtin_gc_usage, builtin_gc_options);
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argv_array_pushl(&pack_refs_cmd, "pack-refs", "--all", "--prune", NULL);
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argv_array_pushl(&reflog, "reflog", "expire", "--all", NULL);
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argv_array_pushl(&repack, "repack", "-d", "-l", NULL);
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argv_array_pushl(&prune, "prune", "--expire", NULL );
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argv_array_pushl(&rerere, "rerere", "gc", NULL);
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git_config(gc_config, NULL);
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if (pack_refs < 0)
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pack_refs = !is_bare_repository();
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argc = parse_options(argc, argv, prefix, builtin_gc_options,
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builtin_gc_usage, 0);
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if (argc > 0)
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usage_with_options(builtin_gc_usage, builtin_gc_options);
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if (aggressive) {
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argv_array_push(&repack, "-f");
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argv_array_push(&repack, "--depth=250");
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if (aggressive_window > 0)
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argv_array_pushf(&repack, "--window=%d", aggressive_window);
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}
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if (quiet)
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argv_array_push(&repack, "-q");
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if (auto_gc) {
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/*
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* Auto-gc should be least intrusive as possible.
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*/
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if (!need_to_gc())
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return 0;
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if (!quiet)
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fprintf(stderr,
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_("Auto packing the repository for optimum performance. You may also\n"
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"run \"git gc\" manually. See "
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"\"git help gc\" for more information.\n"));
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} else
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add_repack_all_option();
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name = lock_repo_for_gc(force, &pid);
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if (name) {
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if (auto_gc)
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return 0; /* be quiet on --auto */
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die(_("gc is already running on machine '%s' pid %"PRIuMAX" (use --force if not)"),
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name, (uintmax_t)pid);
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}
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if (pack_refs && run_command_v_opt(pack_refs_cmd.argv, RUN_GIT_CMD))
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return error(FAILED_RUN, pack_refs_cmd.argv[0]);
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if (run_command_v_opt(reflog.argv, RUN_GIT_CMD))
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return error(FAILED_RUN, reflog.argv[0]);
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if (run_command_v_opt(repack.argv, RUN_GIT_CMD))
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return error(FAILED_RUN, repack.argv[0]);
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if (prune_expire) {
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argv_array_push(&prune, prune_expire);
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if (quiet)
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argv_array_push(&prune, "--no-progress");
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if (run_command_v_opt(prune.argv, RUN_GIT_CMD))
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return error(FAILED_RUN, prune.argv[0]);
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}
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if (run_command_v_opt(rerere.argv, RUN_GIT_CMD))
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return error(FAILED_RUN, rerere.argv[0]);
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if (auto_gc && too_many_loose_objects())
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warning(_("There are too many unreachable loose objects; "
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"run 'git prune' to remove them."));
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return 0;
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}
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