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![Brandon Casey](/assets/img/avatar_default.png)
Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil> Signed-off-by: Junio C Hamano <gitster@pobox.com>
273 lines
6.3 KiB
C
273 lines
6.3 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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#define FAILED_RUN "failed to run %s"
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static const char * const builtin_gc_usage[] = {
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"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 = -1;
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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 char *prune_expire = "2.weeks.ago";
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#define MAX_ADD 10
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static const char *argv_pack_refs[] = {"pack-refs", "--all", "--prune", NULL};
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static const char *argv_reflog[] = {"reflog", "expire", "--all", NULL};
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static const char *argv_repack[MAX_ADD] = {"repack", "-d", "-l", NULL};
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static const char *argv_prune[] = {"prune", "--expire", NULL, NULL};
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static const char *argv_rerere[] = {"rerere", "gc", NULL};
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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)
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return config_error_nonbool(var);
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if (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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prune_expire = xstrdup(value);
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return 0;
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}
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return git_default_config(var, value, cb);
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}
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static void append_option(const char **cmd, const char *opt, int max_length)
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{
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int i;
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for (i = 0; cmd[i]; i++)
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;
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if (i + 2 >= max_length)
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die("Too many options specified");
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cmd[i++] = opt;
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cmd[i] = NULL;
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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 int run_hook(void)
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{
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const char *argv[2];
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struct child_process hook;
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int ret;
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argv[0] = git_path("hooks/pre-auto-gc");
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argv[1] = NULL;
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if (access(argv[0], X_OK) < 0)
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return 0;
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memset(&hook, 0, sizeof(hook));
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hook.argv = argv;
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hook.no_stdin = 1;
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hook.stdout_to_stderr = 1;
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ret = start_command(&hook);
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if (ret) {
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warning("Could not spawn %s", argv[0]);
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return ret;
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}
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ret = finish_command(&hook);
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if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL)
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warning("%s exited due to uncaught signal", argv[0]);
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return ret;
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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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append_option(argv_repack, "-A", MAX_ADD);
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else if (!too_many_loose_objects())
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return 0;
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if (run_hook())
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return 0;
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return 1;
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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 prune = 0;
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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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char buf[80];
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struct option builtin_gc_options[] = {
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OPT_BOOLEAN(0, "prune", &prune, "prune unreferenced objects (deprecated)"),
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OPT_BOOLEAN(0, "aggressive", &aggressive, "be more thorough (increased runtime)"),
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OPT_BOOLEAN(0, "auto", &auto_gc, "enable auto-gc mode"),
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OPT_BOOLEAN('q', "quiet", &quiet, "suppress progress reports"),
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OPT_END()
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};
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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, builtin_gc_options, 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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append_option(argv_repack, "-f", MAX_ADD);
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if (aggressive_window > 0) {
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sprintf(buf, "--window=%d", aggressive_window);
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append_option(argv_repack, buf, MAX_ADD);
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}
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}
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if (quiet)
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append_option(argv_repack, "-q", MAX_ADD);
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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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fprintf(stderr, "Auto packing your repository for optimum "
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"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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append_option(argv_repack, "-A", MAX_ADD);
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if (pack_refs && run_command_v_opt(argv_pack_refs, RUN_GIT_CMD))
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return error(FAILED_RUN, argv_pack_refs[0]);
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if (run_command_v_opt(argv_reflog, RUN_GIT_CMD))
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return error(FAILED_RUN, argv_reflog[0]);
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if (run_command_v_opt(argv_repack, RUN_GIT_CMD))
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return error(FAILED_RUN, argv_repack[0]);
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argv_prune[2] = prune_expire;
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if (run_command_v_opt(argv_prune, RUN_GIT_CMD))
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return error(FAILED_RUN, argv_prune[0]);
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if (run_command_v_opt(argv_rerere, RUN_GIT_CMD))
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return error(FAILED_RUN, argv_rerere[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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