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![Junio C Hamano](/assets/img/avatar_default.png)
"git gc --auto" opens file descriptors for the packfiles before spawning "git repack/prune", which would upset Windows that does not want a process to work on a file that is open by another process. The issue has been worked around. * kg/gc-auto-windows-workaround: gc --auto: release pack files before auto packing
660 lines
17 KiB
C
660 lines
17 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 "repository.h"
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#include "config.h"
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#include "tempfile.h"
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#include "lockfile.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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#include "commit.h"
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#include "commit-graph.h"
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#include "packfile.h"
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#include "object-store.h"
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#include "pack.h"
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#include "pack-objects.h"
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#include "blob.h"
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#include "tree.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 prune_reflogs = 1;
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static int aggressive_depth = 50;
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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 int gc_write_commit_graph;
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static int detach_auto = 1;
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static timestamp_t gc_log_expire_time;
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static const char *gc_log_expire = "1.day.ago";
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static const char *prune_expire = "2.weeks.ago";
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static const char *prune_worktrees_expire = "3.months.ago";
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static unsigned long big_pack_threshold;
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static unsigned long max_delta_cache_size = DEFAULT_DELTA_CACHE_SIZE;
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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 prune_worktrees = ARGV_ARRAY_INIT;
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static struct argv_array rerere = ARGV_ARRAY_INIT;
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static struct tempfile *pidfile;
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static struct lock_file log_lock;
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static struct string_list pack_garbage = STRING_LIST_INIT_DUP;
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static void clean_pack_garbage(void)
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{
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int i;
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for (i = 0; i < pack_garbage.nr; i++)
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unlink_or_warn(pack_garbage.items[i].string);
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string_list_clear(&pack_garbage, 0);
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}
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static void report_pack_garbage(unsigned seen_bits, const char *path)
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{
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if (seen_bits == PACKDIR_FILE_IDX)
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string_list_append(&pack_garbage, path);
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}
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static void process_log_file(void)
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{
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struct stat st;
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if (fstat(get_lock_file_fd(&log_lock), &st)) {
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/*
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* Perhaps there was an i/o error or another
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* unlikely situation. Try to make a note of
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* this in gc.log along with any existing
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* messages.
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*/
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int saved_errno = errno;
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fprintf(stderr, _("Failed to fstat %s: %s"),
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get_tempfile_path(log_lock.tempfile),
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strerror(saved_errno));
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fflush(stderr);
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commit_lock_file(&log_lock);
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errno = saved_errno;
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} else if (st.st_size) {
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/* There was some error recorded in the lock file */
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commit_lock_file(&log_lock);
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} else {
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/* No error, clean up any old gc.log */
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unlink(git_path("gc.log"));
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rollback_lock_file(&log_lock);
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}
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}
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static void process_log_file_at_exit(void)
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{
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fflush(stderr);
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process_log_file();
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}
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static void process_log_file_on_signal(int signo)
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{
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process_log_file();
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sigchain_pop(signo);
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raise(signo);
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}
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static void gc_config(void)
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{
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const char *value;
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if (!git_config_get_value("gc.packrefs", &value)) {
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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("gc.packrefs", value);
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}
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git_config_get_int("gc.aggressivewindow", &aggressive_window);
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git_config_get_int("gc.aggressivedepth", &aggressive_depth);
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git_config_get_int("gc.auto", &gc_auto_threshold);
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git_config_get_int("gc.autopacklimit", &gc_auto_pack_limit);
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git_config_get_bool("gc.writecommitgraph", &gc_write_commit_graph);
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git_config_get_bool("gc.autodetach", &detach_auto);
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git_config_get_expiry("gc.pruneexpire", &prune_expire);
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git_config_get_expiry("gc.worktreepruneexpire", &prune_worktrees_expire);
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git_config_get_expiry("gc.logexpiry", &gc_log_expire);
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git_config_get_ulong("gc.bigpackthreshold", &big_pack_threshold);
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git_config_get_ulong("pack.deltacachesize", &max_delta_cache_size);
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git_config(git_default_config, 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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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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dir = opendir(git_path("objects/17"));
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if (!dir)
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return 0;
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auto_threshold = DIV_ROUND_UP(gc_auto_threshold, 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 struct packed_git *find_base_packs(struct string_list *packs,
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unsigned long limit)
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{
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struct packed_git *p, *base = NULL;
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for (p = get_packed_git(the_repository); p; p = p->next) {
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if (!p->pack_local)
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continue;
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if (limit) {
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if (p->pack_size >= limit)
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string_list_append(packs, p->pack_name);
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} else if (!base || base->pack_size < p->pack_size) {
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base = p;
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}
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}
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if (base)
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string_list_append(packs, base->pack_name);
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return base;
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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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for (cnt = 0, p = get_packed_git(the_repository); 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 uint64_t total_ram(void)
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{
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#if defined(HAVE_SYSINFO)
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struct sysinfo si;
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if (!sysinfo(&si))
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return si.totalram;
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#elif defined(HAVE_BSD_SYSCTL) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM))
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int64_t physical_memory;
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int mib[2];
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size_t length;
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mib[0] = CTL_HW;
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# if defined(HW_MEMSIZE)
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mib[1] = HW_MEMSIZE;
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# else
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mib[1] = HW_PHYSMEM;
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# endif
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length = sizeof(int64_t);
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if (!sysctl(mib, 2, &physical_memory, &length, NULL, 0))
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return physical_memory;
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#elif defined(GIT_WINDOWS_NATIVE)
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MEMORYSTATUSEX memInfo;
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memInfo.dwLength = sizeof(MEMORYSTATUSEX);
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if (GlobalMemoryStatusEx(&memInfo))
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return memInfo.ullTotalPhys;
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#endif
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return 0;
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}
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static uint64_t estimate_repack_memory(struct packed_git *pack)
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{
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unsigned long nr_objects = approximate_object_count();
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size_t os_cache, heap;
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if (!pack || !nr_objects)
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return 0;
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/*
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* First we have to scan through at least one pack.
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* Assume enough room in OS file cache to keep the entire pack
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* or we may accidentally evict data of other processes from
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* the cache.
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*/
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os_cache = pack->pack_size + pack->index_size;
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/* then pack-objects needs lots more for book keeping */
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heap = sizeof(struct object_entry) * nr_objects;
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/*
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* internal rev-list --all --objects takes up some memory too,
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* let's say half of it is for blobs
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*/
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heap += sizeof(struct blob) * nr_objects / 2;
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/*
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* and the other half is for trees (commits and tags are
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* usually insignificant)
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*/
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heap += sizeof(struct tree) * nr_objects / 2;
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/* and then obj_hash[], underestimated in fact */
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heap += sizeof(struct object *) * nr_objects;
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/* revindex is used also */
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heap += sizeof(struct revindex_entry) * nr_objects;
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/*
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* read_sha1_file() (either at delta calculation phase, or
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* writing phase) also fills up the delta base cache
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*/
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heap += delta_base_cache_limit;
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/* and of course pack-objects has its own delta cache */
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heap += max_delta_cache_size;
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return os_cache + heap;
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}
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static int keep_one_pack(struct string_list_item *item, void *data)
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{
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argv_array_pushf(&repack, "--keep-pack=%s", basename(item->string));
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return 0;
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}
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static void add_repack_all_option(struct string_list *keep_pack)
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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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if (keep_pack)
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for_each_string_list(keep_pack, keep_one_pack, NULL);
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}
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static void add_repack_incremental_option(void)
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{
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argv_array_push(&repack, "--no-write-bitmap-index");
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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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struct string_list keep_pack = STRING_LIST_INIT_NODUP;
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if (big_pack_threshold) {
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find_base_packs(&keep_pack, big_pack_threshold);
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if (keep_pack.nr >= gc_auto_pack_limit) {
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big_pack_threshold = 0;
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string_list_clear(&keep_pack, 0);
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find_base_packs(&keep_pack, 0);
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}
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} else {
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struct packed_git *p = find_base_packs(&keep_pack, 0);
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uint64_t mem_have, mem_want;
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mem_have = total_ram();
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mem_want = estimate_repack_memory(p);
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/*
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* Only allow 1/2 of memory for pack-objects, leave
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* the rest for the OS and other processes in the
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* system.
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*/
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if (!mem_have || mem_want < mem_have / 2)
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string_list_clear(&keep_pack, 0);
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}
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add_repack_all_option(&keep_pack);
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string_list_clear(&keep_pack, 0);
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} else if (too_many_loose_objects())
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add_repack_incremental_option();
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else
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return 0;
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if (run_hook_le(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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struct lock_file lock = LOCK_INIT;
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char my_host[HOST_NAME_MAX + 1];
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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;
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char *pidfile_path;
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if (is_tempfile_active(pidfile))
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/* already locked */
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return NULL;
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if (xgethostname(my_host, sizeof(my_host)))
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xsnprintf(my_host, sizeof(my_host), "unknown");
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pidfile_path = git_pathdup("gc.pid");
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fd = hold_lock_file_for_update(&lock, pidfile_path,
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LOCK_DIE_ON_ERROR);
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if (!force) {
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static char locking_host[HOST_NAME_MAX + 1];
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static char *scan_fmt;
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int should_exit;
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if (!scan_fmt)
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scan_fmt = xstrfmt("%s %%%ds", "%"SCNuMAX, HOST_NAME_MAX);
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fp = fopen(pidfile_path, "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, scan_fmt, &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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free(pidfile_path);
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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 = register_tempfile(pidfile_path);
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free(pidfile_path);
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return NULL;
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}
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static int report_last_gc_error(void)
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{
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struct strbuf sb = STRBUF_INIT;
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int ret = 0;
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struct stat st;
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char *gc_log_path = git_pathdup("gc.log");
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if (stat(gc_log_path, &st)) {
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if (errno == ENOENT)
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goto done;
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ret = error_errno(_("Can't stat %s"), gc_log_path);
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goto done;
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}
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if (st.st_mtime < gc_log_expire_time)
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goto done;
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ret = strbuf_read_file(&sb, gc_log_path, 0);
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if (ret > 0)
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ret = error(_("The last gc run reported the following. "
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"Please correct the root cause\n"
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"and remove %s.\n"
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"Automatic cleanup will not be performed "
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"until the file is removed.\n\n"
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"%s"),
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gc_log_path, sb.buf);
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strbuf_release(&sb);
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done:
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free(gc_log_path);
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return ret;
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}
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static int gc_before_repack(void)
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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 (prune_reflogs && run_command_v_opt(reflog.argv, RUN_GIT_CMD))
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return error(FAILED_RUN, reflog.argv[0]);
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pack_refs = 0;
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prune_reflogs = 0;
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return 0;
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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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int daemonized = 0;
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int keep_base_pack = -1;
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timestamp_t dummy;
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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_F(0, "auto", &auto_gc, N_("enable auto-gc mode"),
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|
PARSE_OPT_NOCOMPLETE),
|
|
OPT_BOOL_F(0, "force", &force,
|
|
N_("force running gc even if there may be another gc running"),
|
|
PARSE_OPT_NOCOMPLETE),
|
|
OPT_BOOL(0, "keep-largest-pack", &keep_base_pack,
|
|
N_("repack all other packs except the largest pack")),
|
|
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);
|
|
|
|
/* default expiry time, overwritten in gc_config */
|
|
gc_config();
|
|
if (parse_expiry_date(gc_log_expire, &gc_log_expire_time))
|
|
die(_("failed to parse gc.logexpiry value %s"), gc_log_expire);
|
|
|
|
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 (prune_expire && parse_expiry_date(prune_expire, &dummy))
|
|
die(_("failed to parse prune expiry value %s"), prune_expire);
|
|
|
|
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 (report_last_gc_error())
|
|
return -1;
|
|
|
|
if (lock_repo_for_gc(force, &pid))
|
|
return 0;
|
|
if (gc_before_repack())
|
|
return -1;
|
|
delete_tempfile(&pidfile);
|
|
|
|
/*
|
|
* failure to daemonize is ok, we'll continue
|
|
* in foreground
|
|
*/
|
|
daemonized = !daemonize();
|
|
}
|
|
} else {
|
|
struct string_list keep_pack = STRING_LIST_INIT_NODUP;
|
|
|
|
if (keep_base_pack != -1) {
|
|
if (keep_base_pack)
|
|
find_base_packs(&keep_pack, 0);
|
|
} else if (big_pack_threshold) {
|
|
find_base_packs(&keep_pack, big_pack_threshold);
|
|
}
|
|
|
|
add_repack_all_option(&keep_pack);
|
|
string_list_clear(&keep_pack, 0);
|
|
}
|
|
|
|
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 (daemonized) {
|
|
hold_lock_file_for_update(&log_lock,
|
|
git_path("gc.log"),
|
|
LOCK_DIE_ON_ERROR);
|
|
dup2(get_lock_file_fd(&log_lock), 2);
|
|
sigchain_push_common(process_log_file_on_signal);
|
|
atexit(process_log_file_at_exit);
|
|
}
|
|
|
|
if (gc_before_repack())
|
|
return -1;
|
|
|
|
if (!repository_format_precious_objects) {
|
|
close_all_packs(the_repository->objects);
|
|
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 (repository_format_partial_clone)
|
|
argv_array_push(&prune,
|
|
"--exclude-promisor-objects");
|
|
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]);
|
|
|
|
report_garbage = report_pack_garbage;
|
|
reprepare_packed_git(the_repository);
|
|
if (pack_garbage.nr > 0)
|
|
clean_pack_garbage();
|
|
|
|
if (gc_write_commit_graph)
|
|
write_commit_graph_reachable(get_object_directory(), 0);
|
|
|
|
if (auto_gc && too_many_loose_objects())
|
|
warning(_("There are too many unreachable loose objects; "
|
|
"run 'git prune' to remove them."));
|
|
|
|
if (!daemonized)
|
|
unlink(git_path("gc.log"));
|
|
|
|
return 0;
|
|
}
|