git/builtin-gc.c
Nicolas Pitre 8e8daf3363 objects to be pruned immediately don't have to be loosened
When there is no grace period before pruning unreferenced objects, it is
pointless to push those objects in their loose form just to delete them
right away.

Also be more explicit about the possibility of using "now" in the
gc.pruneexpire config variable (needed for the above behavior to
happen).

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-01-01 04:51:51 -08:00

274 lines
6.4 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 "cache.h"
#include "parse-options.h"
#include "run-command.h"
#define FAILED_RUN "failed to run %s"
static const char * const builtin_gc_usage[] = {
"git gc [options]",
NULL
};
static int pack_refs = 1;
static int aggressive_window = -1;
static int gc_auto_threshold = 6700;
static int gc_auto_pack_limit = 50;
static const char *prune_expire = "2.weeks.ago";
#define MAX_ADD 10
static const char *argv_pack_refs[] = {"pack-refs", "--all", "--prune", NULL};
static const char *argv_reflog[] = {"reflog", "expire", "--all", NULL};
static const char *argv_repack[MAX_ADD] = {"repack", "-d", "-l", NULL};
static const char *argv_prune[] = {"prune", "--expire", NULL, NULL};
static const char *argv_rerere[] = {"rerere", "gc", NULL};
static int gc_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "gc.packrefs")) {
if (value && !strcmp(value, "notbare"))
pack_refs = -1;
else
pack_refs = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "gc.aggressivewindow")) {
aggressive_window = git_config_int(var, value);
return 0;
}
if (!strcmp(var, "gc.auto")) {
gc_auto_threshold = git_config_int(var, value);
return 0;
}
if (!strcmp(var, "gc.autopacklimit")) {
gc_auto_pack_limit = git_config_int(var, value);
return 0;
}
if (!strcmp(var, "gc.pruneexpire")) {
if (value && strcmp(value, "now")) {
unsigned long now = approxidate("now");
if (approxidate(value) >= now)
return error("Invalid %s: '%s'", var, value);
}
return git_config_string(&prune_expire, var, value);
}
return git_default_config(var, value, cb);
}
static void append_option(const char **cmd, const char *opt, int max_length)
{
int i;
for (i = 0; cmd[i]; i++)
;
if (i + 2 >= max_length)
die("Too many options specified");
cmd[i++] = opt;
cmd[i] = 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 int run_hook(void)
{
const char *argv[2];
struct child_process hook;
int ret;
argv[0] = git_path("hooks/pre-auto-gc");
argv[1] = NULL;
if (access(argv[0], X_OK) < 0)
return 0;
memset(&hook, 0, sizeof(hook));
hook.argv = argv;
hook.no_stdin = 1;
hook.stdout_to_stderr = 1;
ret = start_command(&hook);
if (ret) {
warning("Could not spawn %s", argv[0]);
return ret;
}
ret = finish_command(&hook);
if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL)
warning("%s exited due to uncaught signal", argv[0]);
return ret;
}
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())
append_option(argv_repack,
!strcmp(prune_expire, "now") ? "-a" : "-A",
MAX_ADD);
else if (!too_many_loose_objects())
return 0;
if (run_hook())
return 0;
return 1;
}
int cmd_gc(int argc, const char **argv, const char *prefix)
{
int prune = 0;
int aggressive = 0;
int auto_gc = 0;
int quiet = 0;
char buf[80];
struct option builtin_gc_options[] = {
OPT_BOOLEAN(0, "prune", &prune, "prune unreferenced objects (deprecated)"),
OPT_BOOLEAN(0, "aggressive", &aggressive, "be more thorough (increased runtime)"),
OPT_BOOLEAN(0, "auto", &auto_gc, "enable auto-gc mode"),
OPT_BOOLEAN('q', "quiet", &quiet, "suppress progress reports"),
OPT_END()
};
git_config(gc_config, NULL);
if (pack_refs < 0)
pack_refs = !is_bare_repository();
argc = parse_options(argc, argv, builtin_gc_options, builtin_gc_usage, 0);
if (argc > 0)
usage_with_options(builtin_gc_usage, builtin_gc_options);
if (aggressive) {
append_option(argv_repack, "-f", MAX_ADD);
if (aggressive_window > 0) {
sprintf(buf, "--window=%d", aggressive_window);
append_option(argv_repack, buf, MAX_ADD);
}
}
if (quiet)
append_option(argv_repack, "-q", MAX_ADD);
if (auto_gc) {
/*
* Auto-gc should be least intrusive as possible.
*/
if (!need_to_gc())
return 0;
fprintf(stderr, "Auto packing your repository for optimum "
"performance. You may also\n"
"run \"git gc\" manually. See "
"\"git help gc\" for more information.\n");
} else
append_option(argv_repack,
!strcmp(prune_expire, "now") ? "-a" : "-A",
MAX_ADD);
if (pack_refs && run_command_v_opt(argv_pack_refs, RUN_GIT_CMD))
return error(FAILED_RUN, argv_pack_refs[0]);
if (run_command_v_opt(argv_reflog, RUN_GIT_CMD))
return error(FAILED_RUN, argv_reflog[0]);
if (run_command_v_opt(argv_repack, RUN_GIT_CMD))
return error(FAILED_RUN, argv_repack[0]);
argv_prune[2] = prune_expire;
if (run_command_v_opt(argv_prune, RUN_GIT_CMD))
return error(FAILED_RUN, argv_prune[0]);
if (run_command_v_opt(argv_rerere, RUN_GIT_CMD))
return error(FAILED_RUN, argv_rerere[0]);
if (auto_gc && too_many_loose_objects())
warning("There are too many unreachable loose objects; "
"run 'git prune' to remove them.");
return 0;
}