builtin-gc.c

   1 /*
   2  * git gc builtin command
   3  *
   4  * Cleanup unreachable files and optimize the repository.
   5  *
   6  * Copyright (c) 2007 James Bowes
   7  *
   8  * Based on git-gc.sh, which is
   9  *
  10  * Copyright (c) 2006 Shawn O. Pearce
  11  */
  12
  13 #include "builtin.h"
  14 #include "cache.h"
  15 #include "run-command.h"
  16
  17 #define FAILED_RUN "failed to run %s"
  18
  19 static const char builtin_gc_usage[] = "git-gc [--prune] [--aggressive]";
  20
  21 static int pack_refs = 1;
  22 static int aggressive_window = -1;
  23
  24 #define MAX_ADD 10
  25 static const char *argv_pack_refs[] = {"pack-refs", "--all", "--prune", NULL};
  26 static const char *argv_reflog[] = {"reflog", "expire", "--all", NULL};
  27 static const char *argv_repack[MAX_ADD] = {"repack", "-a", "-d", "-l", NULL};
  28 static const char *argv_prune[] = {"prune", NULL};
  29 static const char *argv_rerere[] = {"rerere", "gc", NULL};
  30
  31 static int gc_config(const char *var, const char *value)
  32 {
  33         if (!strcmp(var, "gc.packrefs")) {
  34                 if (!strcmp(value, "notbare"))
  35                         pack_refs = -1;
  36                 else
  37                         pack_refs = git_config_bool(var, value);
  38                 return 0;
  39         }
  40         if (!strcmp(var, "gc.aggressivewindow")) {
  41                 aggressive_window = git_config_int(var, value);
  42                 return 0;
  43         }
  44         return git_default_config(var, value);
  45 }
  46
  47 static void append_option(const char **cmd, const char *opt, int max_length)
  48 {
  49         int i;
  50
  51         for (i = 0; cmd[i]; i++)
  52                 ;
  53
  54         if (i + 2 >= max_length)
  55                 die("Too many options specified");
  56         cmd[i++] = opt;
  57         cmd[i] = NULL;
  58 }
  59
  60 int cmd_gc(int argc, const char **argv, const char *prefix)
  61 {
  62         int i;
  63         int prune = 0;
  64         char buf[80];
  65
  66         git_config(gc_config);
  67
  68         if (pack_refs < 0)
  69                 pack_refs = !is_bare_repository();
  70
  71         for (i = 1; i < argc; i++) {
  72                 const char *arg = argv[i];
  73                 if (!strcmp(arg, "--prune")) {
  74                         prune = 1;
  75                         continue;
  76                 }
  77                 if (!strcmp(arg, "--aggressive")) {
  78                         append_option(argv_repack, "-f", MAX_ADD);
  79                         if (aggressive_window > 0) {
  80                                 sprintf(buf, "--window=%d", aggressive_window);
  81                                 append_option(argv_repack, buf, MAX_ADD);
  82                         }
  83                         continue;
  84                 }
  85                 /* perhaps other parameters later... */
  86                 break;
  87         }
  88         if (i != argc)
  89                 usage(builtin_gc_usage);
  90
  91         if (pack_refs && run_command_v_opt(argv_pack_refs, RUN_GIT_CMD))
  92                 return error(FAILED_RUN, argv_pack_refs[0]);
  93
  94         if (run_command_v_opt(argv_reflog, RUN_GIT_CMD))
  95                 return error(FAILED_RUN, argv_reflog[0]);
  96
  97         if (run_command_v_opt(argv_repack, RUN_GIT_CMD))
  98                 return error(FAILED_RUN, argv_repack[0]);
  99
 100         if (prune && run_command_v_opt(argv_prune, RUN_GIT_CMD))
 101                 return error(FAILED_RUN, argv_prune[0]);
 102
 103         if (run_command_v_opt(argv_rerere, RUN_GIT_CMD))
 104                 return error(FAILED_RUN, argv_rerere[0]);
 105
 106         return 0;
 107 }