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gc: reject if another gc is running, unless --force is given
This may happen when `git gc --auto` is run automatically, then the user, to avoid wait time, switches to a new terminal, keeps working and `git gc --auto` is started again because the first gc instance has not clean up the repository. This patch tries to avoid multiple gc running, especially in --auto mode. In the worst case, gc may be delayed 12 hours if a daemon reuses the pid stored in gc.pid. kill(pid, 0) support is added to MinGW port so it should work on Windows too. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -9,7 +9,7 @@ git-gc - Cleanup unnecessary files and optimize the local repository
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SYNOPSIS
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--------
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[verse]
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'git gc' [--aggressive] [--auto] [--quiet] [--prune=<date> | --no-prune]
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'git gc' [--aggressive] [--auto] [--quiet] [--prune=<date> | --no-prune] [--force]
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DESCRIPTION
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-----------
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@ -71,6 +71,10 @@ automatic consolidation of packs.
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--quiet::
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Suppress all progress reports.
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--force::
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Force `git gc` to run even if there may be another `git gc`
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instance running on this repository.
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Configuration
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-------------
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67
builtin/gc.c
67
builtin/gc.c
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@ -167,11 +167,69 @@ static int need_to_gc(void)
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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 (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));
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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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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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@ -180,6 +238,7 @@ int cmd_gc(int argc, const char **argv, const char *prefix)
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PARSE_OPT_OPTARG, NULL, (intptr_t)prune_expire },
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OPT_BOOLEAN(0, "aggressive", &aggressive, N_("be more thorough (increased runtime)")),
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OPT_BOOLEAN(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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@ -225,6 +284,14 @@ int cmd_gc(int argc, const char **argv, const char *prefix)
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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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@ -1086,6 +1086,12 @@ int mingw_kill(pid_t pid, int sig)
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errno = err_win_to_posix(GetLastError());
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CloseHandle(h);
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return -1;
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} else if (pid > 0 && sig == 0) {
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HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
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if (h) {
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CloseHandle(h);
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return 0;
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}
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}
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errno = EINVAL;
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