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