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https://github.com/git/git.git
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2c3c439947
This implements a new option "git gc --auto". When gc.auto is set to a positive value, and the object database has accumulated roughly that many number of loose objects, this runs a lightweight version of "git gc". The primary difference from the full "git gc" is that it does not pass "-a" option to "git repack", which means we do not try to repack _everything_, but only repack incrementally. We still do "git prune-packed". The default threshold is arbitrarily set by yours truly to: - not trigger it for fully unpacked git v0.99 history; - do trigger it for fully unpacked git v1.0.0 history; - not trigger it for incremental update to git v1.0.0 starting from fully packed git v0.99 history. This patch does not add invocation of the "auto repacking". It is left to key Porcelain commands that could produce tons of loose objects to add a call to "git gc --auto" after they are done their work. Signed-off-by: Junio C Hamano <gitster@pobox.com>
170 lines
3.8 KiB
C
170 lines
3.8 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 "run-command.h"
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#define FAILED_RUN "failed to run %s"
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static const char builtin_gc_usage[] = "git-gc [--prune] [--aggressive]";
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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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#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", "-a", "-d", "-l", NULL};
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static const char *argv_prune[] = {"prune", NULL};
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static const char *argv_rerere[] = {"rerere", "gc", NULL};
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static const char *argv_repack_auto[] = {"repack", "-d", "-l", NULL};
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static int gc_config(const char *var, const char *value)
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{
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if (!strcmp(var, "gc.packrefs")) {
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if (!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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return git_default_config(var, value);
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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 need_to_gc(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 (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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int cmd_gc(int argc, const char **argv, const char *prefix)
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{
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int i;
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int prune = 0;
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int auto_gc = 0;
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char buf[80];
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git_config(gc_config);
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if (pack_refs < 0)
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pack_refs = !is_bare_repository();
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for (i = 1; i < argc; i++) {
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const char *arg = argv[i];
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if (!strcmp(arg, "--prune")) {
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prune = 1;
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continue;
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}
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if (!strcmp(arg, "--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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continue;
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}
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if (!strcmp(arg, "--auto")) {
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if (gc_auto_threshold <= 0)
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return 0;
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auto_gc = 1;
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continue;
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}
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break;
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}
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if (i != argc)
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usage(builtin_gc_usage);
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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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prune = 0;
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for (i = 0; i < ARRAY_SIZE(argv_repack_auto); i++)
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argv_repack[i] = argv_repack_auto[i];
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if (!need_to_gc())
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return 0;
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}
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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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if (prune && 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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return 0;
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}
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