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 const char *argv_repack_auto[] = {"repack", "-d", "-l", NULL};
34 static int gc_config(const char *var, const char *value)
36 if (!strcmp(var, "gc.packrefs")) {
37 if (!strcmp(value, "notbare"))
40 pack_refs = git_config_bool(var, value);
43 if (!strcmp(var, "gc.aggressivewindow")) {
44 aggressive_window = git_config_int(var, value);
47 if (!strcmp(var, "gc.auto")) {
48 gc_auto_threshold = git_config_int(var, value);
51 return git_default_config(var, value);
54 static void append_option(const char **cmd, const char *opt, int max_length)
58 for (i = 0; cmd[i]; i++)
61 if (i + 2 >= max_length)
62 die("Too many options specified");
67 static int too_many_loose_objects(void)
70 * Quickly check if a "gc" is needed, by estimating how
71 * many loose objects there are. Because SHA-1 is evenly
72 * distributed, we can check only one and get a reasonable
76 const char *objdir = get_object_directory();
83 if (sizeof(path) <= snprintf(path, sizeof(path), "%s/17", objdir)) {
84 warning("insanely long object directory %.*s", 50, objdir);
91 auto_threshold = (gc_auto_threshold + 255) / 256;
92 while ((ent = readdir(dir)) != NULL) {
93 if (strspn(ent->d_name, "0123456789abcdef") != 38 ||
94 ent->d_name[38] != '\0')
96 if (++num_loose > auto_threshold) {
105 static int need_to_gc(void)
108 * Setting gc.auto to 0 or negative can disable the
111 if (gc_auto_threshold <= 0)
114 return too_many_loose_objects();
117 int cmd_gc(int argc, const char **argv, const char *prefix)
124 git_config(gc_config);
127 pack_refs = !is_bare_repository();
129 for (i = 1; i < argc; i++) {
130 const char *arg = argv[i];
131 if (!strcmp(arg, "--prune")) {
135 if (!strcmp(arg, "--aggressive")) {
136 append_option(argv_repack, "-f", MAX_ADD);
137 if (aggressive_window > 0) {
138 sprintf(buf, "--window=%d", aggressive_window);
139 append_option(argv_repack, buf, MAX_ADD);
143 if (!strcmp(arg, "--auto")) {
150 usage(builtin_gc_usage);
154 * Auto-gc should be least intrusive as possible.
157 for (i = 0; i < ARRAY_SIZE(argv_repack_auto); i++)
158 argv_repack[i] = argv_repack_auto[i];
163 if (pack_refs && run_command_v_opt(argv_pack_refs, RUN_GIT_CMD))
164 return error(FAILED_RUN, argv_pack_refs[0]);
166 if (run_command_v_opt(argv_reflog, RUN_GIT_CMD))
167 return error(FAILED_RUN, argv_reflog[0]);
169 if (run_command_v_opt(argv_repack, RUN_GIT_CMD))
170 return error(FAILED_RUN, argv_repack[0]);
172 if (prune && run_command_v_opt(argv_prune, RUN_GIT_CMD))
173 return error(FAILED_RUN, argv_prune[0]);
175 if (run_command_v_opt(argv_rerere, RUN_GIT_CMD))
176 return error(FAILED_RUN, argv_rerere[0]);
178 if (auto_gc && too_many_loose_objects())
179 warning("There are too many unreachable loose objects; "
180 "run 'git prune' to remove them.");