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Description: Git source code
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git-source / builtin-gc.c
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/*
 * 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 "run-command.h"
 
#define FAILED_RUN "failed to run %s"
 
static const char builtin_gc_usage[] = "git-gc [--prune] [--aggressive]";
 
static int pack_refs = 1;
static int aggressive_window = -1;
 
#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", "-a", "-d", "-l", NULL};
static const char *argv_prune[] = {"prune", NULL};
static const char *argv_rerere[] = {"rerere", "gc", NULL};
 
static int gc_config(const char *var, const char *value)
{
  if (!strcmp(var, "gc.packrefs")) {
    if (!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;
  }
  return git_default_config(var, value);
}
 
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;
}
 
int cmd_gc(int argc, const char **argv, const char *prefix)
{
  int i;
  int prune = 0;
  char buf[80];
 
  git_config(gc_config);
 
  if (pack_refs < 0)
    pack_refs = !is_bare_repository();
 
  for (i = 1; i < argc; i++) {
    const char *arg = argv[i];
    if (!strcmp(arg, "--prune")) {
      prune = 1;
      continue;
    }
    if (!strcmp(arg, "--aggressive")) {
      append_option(argv_repack, "-f", MAX_ADD);
      if (aggressive_window > 0) {
        sprintf(buf, "--window=%d", aggressive_window);
        append_option(argv_repack, buf, MAX_ADD);
      }
      continue;
    }
    /* perhaps other parameters later... */
    break;
  }
  if (i != argc)
    usage(builtin_gc_usage);
 
  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 && 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]);
 
  return 0;
}