2 * git gc builtin command
4 * Cleanup unreachable files and optimize the repository.
6 * Copyright (c) 2007 James Bowes
8 * Based on git-gc.sh, which is
10 * Copyright (c) 2006 Shawn O. Pearce
15 #include "run-command.h"
17 #define FAILED_RUN "failed to run %s"
19 static const char builtin_gc_usage[] = "git-gc [--prune] [--aggressive]";
21 static int pack_refs = 1;
22 static int aggressive_window = -1;
23 static int gc_auto_threshold = 6700;
26 static const char *argv_pack_refs[] = {"pack-refs", "--all", "--prune", NULL};
27 static const char *argv_reflog[] = {"reflog", "expire", "--all", NULL};
28 static const char *argv_repack[MAX_ADD] = {"repack", "-a", "-d", "-l", NULL};
29 static const char *argv_prune[] = {"prune", NULL};
30 static const char *argv_rerere[] = {"rerere", "gc", NULL};
32 static int gc_config(const char *var, const char *value)
34 if (!strcmp(var, "gc.packrefs")) {
35 if (!strcmp(value, "notbare"))
38 pack_refs = git_config_bool(var, value);
41 if (!strcmp(var, "gc.aggressivewindow")) {
42 aggressive_window = git_config_int(var, value);
45 if (!strcmp(var, "gc.auto")) {
46 gc_auto_threshold = git_config_int(var, value);
49 return git_default_config(var, value);
52 static void append_option(const char **cmd, const char *opt, int max_length)
56 for (i = 0; cmd[i]; i++)
59 if (i + 2 >= max_length)
60 die("Too many options specified");
65 static int too_many_loose_objects(void)
68 * Quickly check if a "gc" is needed, by estimating how
69 * many loose objects there are. Because SHA-1 is evenly
70 * distributed, we can check only one and get a reasonable
74 const char *objdir = get_object_directory();
81 if (sizeof(path) <= snprintf(path, sizeof(path), "%s/17", objdir)) {
82 warning("insanely long object directory %.*s", 50, objdir);
89 auto_threshold = (gc_auto_threshold + 255) / 256;
90 while ((ent = readdir(dir)) != NULL) {
91 if (strspn(ent->d_name, "0123456789abcdef") != 38 ||
92 ent->d_name[38] != '\0')
94 if (++num_loose > auto_threshold) {
103 static int need_to_gc(void)
108 * Setting gc.auto to 0 or negative can disable the
111 if (gc_auto_threshold <= 0)
114 if (!too_many_loose_objects())
117 argv_repack[ac++] = "repack";
118 argv_repack[ac++] = "-d";
119 argv_repack[ac++] = "-l";
120 argv_repack[ac++] = NULL;
124 int cmd_gc(int argc, const char **argv, const char *prefix)
131 git_config(gc_config);
134 pack_refs = !is_bare_repository();
136 for (i = 1; i < argc; i++) {
137 const char *arg = argv[i];
138 if (!strcmp(arg, "--prune")) {
142 if (!strcmp(arg, "--aggressive")) {
143 append_option(argv_repack, "-f", MAX_ADD);
144 if (aggressive_window > 0) {
145 sprintf(buf, "--window=%d", aggressive_window);
146 append_option(argv_repack, buf, MAX_ADD);
150 if (!strcmp(arg, "--auto")) {
157 usage(builtin_gc_usage);
161 * Auto-gc should be least intrusive as possible.
168 if (pack_refs && run_command_v_opt(argv_pack_refs, RUN_GIT_CMD))
169 return error(FAILED_RUN, argv_pack_refs[0]);
171 if (run_command_v_opt(argv_reflog, RUN_GIT_CMD))
172 return error(FAILED_RUN, argv_reflog[0]);
174 if (run_command_v_opt(argv_repack, RUN_GIT_CMD))
175 return error(FAILED_RUN, argv_repack[0]);
177 if (prune && run_command_v_opt(argv_prune, RUN_GIT_CMD))
178 return error(FAILED_RUN, argv_prune[0]);
180 if (run_command_v_opt(argv_rerere, RUN_GIT_CMD))
181 return error(FAILED_RUN, argv_rerere[0]);
183 if (auto_gc && too_many_loose_objects())
184 warning("There are too many unreachable loose objects; "
185 "run 'git prune' to remove them.");