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-rw-r--r--builtin/gc.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/builtin/gc.c b/builtin/gc.c
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index 0000000..ff5f73b
--- /dev/null
+++ b/builtin/gc.c
@@ -0,0 +1,258 @@
+/*
+ * 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 = 250;
+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 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,
+ prune_expire && !strcmp(prune_expire, "now") ?
+ "-a" : "-A",
+ MAX_ADD);
+ else if (!too_many_loose_objects())
+ return 0;
+
+ if (run_hook(NULL, "pre-auto-gc", NULL))
+ return 0;
+ return 1;
+}
+
+int cmd_gc(int argc, const char **argv, const char *prefix)
+{
+ int aggressive = 0;
+ int auto_gc = 0;
+ int quiet = 0;
+ char buf[80];
+
+ struct option builtin_gc_options[] = {
+ OPT__QUIET(&quiet, "suppress progress reporting"),
+ { OPTION_STRING, 0, "prune", &prune_expire, "date",
+ "prune unreferenced objects",
+ PARSE_OPT_OPTARG, NULL, (intptr_t)prune_expire },
+ OPT_BOOLEAN(0, "aggressive", &aggressive, "be more thorough (increased runtime)"),
+ OPT_BOOLEAN(0, "auto", &auto_gc, "enable auto-gc mode"),
+ OPT_END()
+ };
+
+ if (argc == 2 && !strcmp(argv[1], "-h"))
+ usage_with_options(builtin_gc_usage, builtin_gc_options);
+
+ git_config(gc_config, NULL);
+
+ 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) {
+ append_option(argv_repack, "-f", MAX_ADD);
+ append_option(argv_repack, "--depth=250", 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;
+ if (quiet)
+ fprintf(stderr, _("Auto packing the repository for optimum performance.\n"));
+ else
+ fprintf(stderr,
+ _("Auto packing the repository for optimum performance. You may also\n"
+ "run \"git gc\" manually. See "
+ "\"git help gc\" for more information."));
+ } else
+ append_option(argv_repack,
+ prune_expire && !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]);
+
+ if (prune_expire) {
+ 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;
+}