mirror of
https://github.com/git/git.git
synced 2024-12-13 11:54:56 +08:00
db86e61cbb
The "lockfile" API has been rebuilt on top of a new "tempfile" API. * mh/tempfile: credential-cache--daemon: use tempfile module credential-cache--daemon: delete socket from main() gc: use tempfile module to handle gc.pid file lock_repo_for_gc(): compute the path to "gc.pid" only once diff: use tempfile module setup_temporary_shallow(): use tempfile module write_shared_index(): use tempfile module register_tempfile(): new function to handle an existing temporary file tempfile: add several functions for creating temporary files prepare_tempfile_object(): new function, extracted from create_tempfile() tempfile: a new module for handling temporary files commit_lock_file(): use get_locked_file_path() lockfile: add accessor get_lock_file_path() lockfile: add accessors get_lock_file_fd() and get_lock_file_fp() create_bundle(): duplicate file descriptor to avoid closing it twice lockfile: move documentation to lockfile.h and lockfile.c
369 lines
9.5 KiB
C
369 lines
9.5 KiB
C
/*
|
|
* git gc builtin command
|
|
*
|
|
* Cleanup unreachable files and optimize the repository.
|
|
*
|
|
* Copyright (c) 2007 James Bowes
|
|
*
|
|
* Based on git-gc.sh, which is
|
|
*
|
|
* Copyright (c) 2006 Shawn O. Pearce
|
|
*/
|
|
|
|
#include "builtin.h"
|
|
#include "tempfile.h"
|
|
#include "lockfile.h"
|
|
#include "parse-options.h"
|
|
#include "run-command.h"
|
|
#include "sigchain.h"
|
|
#include "argv-array.h"
|
|
#include "commit.h"
|
|
|
|
#define FAILED_RUN "failed to run %s"
|
|
|
|
static const char * const builtin_gc_usage[] = {
|
|
N_("git gc [<options>]"),
|
|
NULL
|
|
};
|
|
|
|
static int pack_refs = 1;
|
|
static int prune_reflogs = 1;
|
|
static int aggressive_depth = 250;
|
|
static int aggressive_window = 250;
|
|
static int gc_auto_threshold = 6700;
|
|
static int gc_auto_pack_limit = 50;
|
|
static int detach_auto = 1;
|
|
static const char *prune_expire = "2.weeks.ago";
|
|
static const char *prune_worktrees_expire = "3.months.ago";
|
|
|
|
static struct argv_array pack_refs_cmd = ARGV_ARRAY_INIT;
|
|
static struct argv_array reflog = ARGV_ARRAY_INIT;
|
|
static struct argv_array repack = ARGV_ARRAY_INIT;
|
|
static struct argv_array prune = ARGV_ARRAY_INIT;
|
|
static struct argv_array prune_worktrees = ARGV_ARRAY_INIT;
|
|
static struct argv_array rerere = ARGV_ARRAY_INIT;
|
|
|
|
static struct tempfile pidfile;
|
|
|
|
static void git_config_date_string(const char *key, const char **output)
|
|
{
|
|
if (git_config_get_string_const(key, output))
|
|
return;
|
|
if (strcmp(*output, "now")) {
|
|
unsigned long now = approxidate("now");
|
|
if (approxidate(*output) >= now)
|
|
git_die_config(key, _("Invalid %s: '%s'"), key, *output);
|
|
}
|
|
}
|
|
|
|
static void gc_config(void)
|
|
{
|
|
const char *value;
|
|
|
|
if (!git_config_get_value("gc.packrefs", &value)) {
|
|
if (value && !strcmp(value, "notbare"))
|
|
pack_refs = -1;
|
|
else
|
|
pack_refs = git_config_bool("gc.packrefs", value);
|
|
}
|
|
|
|
git_config_get_int("gc.aggressivewindow", &aggressive_window);
|
|
git_config_get_int("gc.aggressivedepth", &aggressive_depth);
|
|
git_config_get_int("gc.auto", &gc_auto_threshold);
|
|
git_config_get_int("gc.autopacklimit", &gc_auto_pack_limit);
|
|
git_config_get_bool("gc.autodetach", &detach_auto);
|
|
git_config_date_string("gc.pruneexpire", &prune_expire);
|
|
git_config_date_string("gc.worktreepruneexpire", &prune_worktrees_expire);
|
|
git_config(git_default_config, NULL);
|
|
}
|
|
|
|
static int too_many_loose_objects(void)
|
|
{
|
|
/*
|
|
* Quickly check if a "gc" is needed, by estimating how
|
|
* many loose objects there are. Because SHA-1 is evenly
|
|
* distributed, we can check only one and get a reasonable
|
|
* estimate.
|
|
*/
|
|
char path[PATH_MAX];
|
|
const char *objdir = get_object_directory();
|
|
DIR *dir;
|
|
struct dirent *ent;
|
|
int auto_threshold;
|
|
int num_loose = 0;
|
|
int needed = 0;
|
|
|
|
if (gc_auto_threshold <= 0)
|
|
return 0;
|
|
|
|
if (sizeof(path) <= snprintf(path, sizeof(path), "%s/17", objdir)) {
|
|
warning(_("insanely long object directory %.*s"), 50, objdir);
|
|
return 0;
|
|
}
|
|
dir = opendir(path);
|
|
if (!dir)
|
|
return 0;
|
|
|
|
auto_threshold = (gc_auto_threshold + 255) / 256;
|
|
while ((ent = readdir(dir)) != NULL) {
|
|
if (strspn(ent->d_name, "0123456789abcdef") != 38 ||
|
|
ent->d_name[38] != '\0')
|
|
continue;
|
|
if (++num_loose > auto_threshold) {
|
|
needed = 1;
|
|
break;
|
|
}
|
|
}
|
|
closedir(dir);
|
|
return needed;
|
|
}
|
|
|
|
static int too_many_packs(void)
|
|
{
|
|
struct packed_git *p;
|
|
int cnt;
|
|
|
|
if (gc_auto_pack_limit <= 0)
|
|
return 0;
|
|
|
|
prepare_packed_git();
|
|
for (cnt = 0, p = packed_git; p; p = p->next) {
|
|
if (!p->pack_local)
|
|
continue;
|
|
if (p->pack_keep)
|
|
continue;
|
|
/*
|
|
* Perhaps check the size of the pack and count only
|
|
* very small ones here?
|
|
*/
|
|
cnt++;
|
|
}
|
|
return gc_auto_pack_limit <= cnt;
|
|
}
|
|
|
|
static void add_repack_all_option(void)
|
|
{
|
|
if (prune_expire && !strcmp(prune_expire, "now"))
|
|
argv_array_push(&repack, "-a");
|
|
else {
|
|
argv_array_push(&repack, "-A");
|
|
if (prune_expire)
|
|
argv_array_pushf(&repack, "--unpack-unreachable=%s", prune_expire);
|
|
}
|
|
}
|
|
|
|
static int need_to_gc(void)
|
|
{
|
|
/*
|
|
* Setting gc.auto to 0 or negative can disable the
|
|
* automatic gc.
|
|
*/
|
|
if (gc_auto_threshold <= 0)
|
|
return 0;
|
|
|
|
/*
|
|
* If there are too many loose objects, but not too many
|
|
* packs, we run "repack -d -l". If there are too many packs,
|
|
* we run "repack -A -d -l". Otherwise we tell the caller
|
|
* there is no need.
|
|
*/
|
|
if (too_many_packs())
|
|
add_repack_all_option();
|
|
else if (!too_many_loose_objects())
|
|
return 0;
|
|
|
|
if (run_hook_le(NULL, "pre-auto-gc", NULL))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/* return NULL on success, else hostname running the gc */
|
|
static const char *lock_repo_for_gc(int force, pid_t* ret_pid)
|
|
{
|
|
static struct lock_file lock;
|
|
char my_host[128];
|
|
struct strbuf sb = STRBUF_INIT;
|
|
struct stat st;
|
|
uintmax_t pid;
|
|
FILE *fp;
|
|
int fd;
|
|
char *pidfile_path;
|
|
|
|
if (is_tempfile_active(&pidfile))
|
|
/* already locked */
|
|
return NULL;
|
|
|
|
if (gethostname(my_host, sizeof(my_host)))
|
|
strcpy(my_host, "unknown");
|
|
|
|
pidfile_path = git_pathdup("gc.pid");
|
|
fd = hold_lock_file_for_update(&lock, pidfile_path,
|
|
LOCK_DIE_ON_ERROR);
|
|
if (!force) {
|
|
static char locking_host[128];
|
|
int should_exit;
|
|
fp = fopen(pidfile_path, "r");
|
|
memset(locking_host, 0, sizeof(locking_host));
|
|
should_exit =
|
|
fp != NULL &&
|
|
!fstat(fileno(fp), &st) &&
|
|
/*
|
|
* 12 hour limit is very generous as gc should
|
|
* never take that long. On the other hand we
|
|
* don't really need a strict limit here,
|
|
* running gc --auto one day late is not a big
|
|
* problem. --force can be used in manual gc
|
|
* after the user verifies that no gc is
|
|
* running.
|
|
*/
|
|
time(NULL) - st.st_mtime <= 12 * 3600 &&
|
|
fscanf(fp, "%"PRIuMAX" %127c", &pid, locking_host) == 2 &&
|
|
/* be gentle to concurrent "gc" on remote hosts */
|
|
(strcmp(locking_host, my_host) || !kill(pid, 0) || errno == EPERM);
|
|
if (fp != NULL)
|
|
fclose(fp);
|
|
if (should_exit) {
|
|
if (fd >= 0)
|
|
rollback_lock_file(&lock);
|
|
*ret_pid = pid;
|
|
free(pidfile_path);
|
|
return locking_host;
|
|
}
|
|
}
|
|
|
|
strbuf_addf(&sb, "%"PRIuMAX" %s",
|
|
(uintmax_t) getpid(), my_host);
|
|
write_in_full(fd, sb.buf, sb.len);
|
|
strbuf_release(&sb);
|
|
commit_lock_file(&lock);
|
|
register_tempfile(&pidfile, pidfile_path);
|
|
free(pidfile_path);
|
|
return NULL;
|
|
}
|
|
|
|
static int gc_before_repack(void)
|
|
{
|
|
if (pack_refs && run_command_v_opt(pack_refs_cmd.argv, RUN_GIT_CMD))
|
|
return error(FAILED_RUN, pack_refs_cmd.argv[0]);
|
|
|
|
if (prune_reflogs && run_command_v_opt(reflog.argv, RUN_GIT_CMD))
|
|
return error(FAILED_RUN, reflog.argv[0]);
|
|
|
|
pack_refs = 0;
|
|
prune_reflogs = 0;
|
|
return 0;
|
|
}
|
|
|
|
int cmd_gc(int argc, const char **argv, const char *prefix)
|
|
{
|
|
int aggressive = 0;
|
|
int auto_gc = 0;
|
|
int quiet = 0;
|
|
int force = 0;
|
|
const char *name;
|
|
pid_t pid;
|
|
|
|
struct option builtin_gc_options[] = {
|
|
OPT__QUIET(&quiet, N_("suppress progress reporting")),
|
|
{ OPTION_STRING, 0, "prune", &prune_expire, N_("date"),
|
|
N_("prune unreferenced objects"),
|
|
PARSE_OPT_OPTARG, NULL, (intptr_t)prune_expire },
|
|
OPT_BOOL(0, "aggressive", &aggressive, N_("be more thorough (increased runtime)")),
|
|
OPT_BOOL(0, "auto", &auto_gc, N_("enable auto-gc mode")),
|
|
OPT_BOOL(0, "force", &force, N_("force running gc even if there may be another gc running")),
|
|
OPT_END()
|
|
};
|
|
|
|
if (argc == 2 && !strcmp(argv[1], "-h"))
|
|
usage_with_options(builtin_gc_usage, builtin_gc_options);
|
|
|
|
argv_array_pushl(&pack_refs_cmd, "pack-refs", "--all", "--prune", NULL);
|
|
argv_array_pushl(&reflog, "reflog", "expire", "--all", NULL);
|
|
argv_array_pushl(&repack, "repack", "-d", "-l", NULL);
|
|
argv_array_pushl(&prune, "prune", "--expire", NULL);
|
|
argv_array_pushl(&prune_worktrees, "worktree", "prune", "--expire", NULL);
|
|
argv_array_pushl(&rerere, "rerere", "gc", NULL);
|
|
|
|
gc_config();
|
|
|
|
if (pack_refs < 0)
|
|
pack_refs = !is_bare_repository();
|
|
|
|
argc = parse_options(argc, argv, prefix, builtin_gc_options,
|
|
builtin_gc_usage, 0);
|
|
if (argc > 0)
|
|
usage_with_options(builtin_gc_usage, builtin_gc_options);
|
|
|
|
if (aggressive) {
|
|
argv_array_push(&repack, "-f");
|
|
if (aggressive_depth > 0)
|
|
argv_array_pushf(&repack, "--depth=%d", aggressive_depth);
|
|
if (aggressive_window > 0)
|
|
argv_array_pushf(&repack, "--window=%d", aggressive_window);
|
|
}
|
|
if (quiet)
|
|
argv_array_push(&repack, "-q");
|
|
|
|
if (auto_gc) {
|
|
/*
|
|
* Auto-gc should be least intrusive as possible.
|
|
*/
|
|
if (!need_to_gc())
|
|
return 0;
|
|
if (!quiet) {
|
|
if (detach_auto)
|
|
fprintf(stderr, _("Auto packing the repository in background for optimum performance.\n"));
|
|
else
|
|
fprintf(stderr, _("Auto packing the repository for optimum performance.\n"));
|
|
fprintf(stderr, _("See \"git help gc\" for manual housekeeping.\n"));
|
|
}
|
|
if (detach_auto) {
|
|
if (gc_before_repack())
|
|
return -1;
|
|
/*
|
|
* failure to daemonize is ok, we'll continue
|
|
* in foreground
|
|
*/
|
|
daemonize();
|
|
}
|
|
} else
|
|
add_repack_all_option();
|
|
|
|
name = lock_repo_for_gc(force, &pid);
|
|
if (name) {
|
|
if (auto_gc)
|
|
return 0; /* be quiet on --auto */
|
|
die(_("gc is already running on machine '%s' pid %"PRIuMAX" (use --force if not)"),
|
|
name, (uintmax_t)pid);
|
|
}
|
|
|
|
if (gc_before_repack())
|
|
return -1;
|
|
|
|
if (run_command_v_opt(repack.argv, RUN_GIT_CMD))
|
|
return error(FAILED_RUN, repack.argv[0]);
|
|
|
|
if (prune_expire) {
|
|
argv_array_push(&prune, prune_expire);
|
|
if (quiet)
|
|
argv_array_push(&prune, "--no-progress");
|
|
if (run_command_v_opt(prune.argv, RUN_GIT_CMD))
|
|
return error(FAILED_RUN, prune.argv[0]);
|
|
}
|
|
|
|
if (prune_worktrees_expire) {
|
|
argv_array_push(&prune_worktrees, prune_worktrees_expire);
|
|
if (run_command_v_opt(prune_worktrees.argv, RUN_GIT_CMD))
|
|
return error(FAILED_RUN, prune_worktrees.argv[0]);
|
|
}
|
|
|
|
if (run_command_v_opt(rerere.argv, RUN_GIT_CMD))
|
|
return error(FAILED_RUN, rerere.argv[0]);
|
|
|
|
if (auto_gc && too_many_loose_objects())
|
|
warning(_("There are too many unreachable loose objects; "
|
|
"run 'git prune' to remove them."));
|
|
|
|
return 0;
|
|
}
|