Andrew's git - gitweb.git/blob

   1/*
   2 * Builtin "git replace"
   3 *
   4 * Copyright (c) 2008 Christian Couder <chriscool@tuxfamily.org>
   5 *
   6 * Based on builtin-tag.c by Kristian Høgsberg <krh@redhat.com>
   7 * and Carlos Rica <jasampler@gmail.com> that was itself based on
   8 * git-tag.sh and mktag.c by Linus Torvalds.
   9 */
  10
  11#include "cache.h"
  12#include "builtin.h"
  13#include "refs.h"
  14#include "parse-options.h"
  15
  16static const char * const git_replace_usage[] = {
  17        "git replace [-f] <object> <replacement>",
  18        "git replace -d <object>...",
  19        "git replace -l [<pattern>]",
  20        NULL
  21};
  22
  23static int show_reference(const char *refname, const unsigned char *sha1,
  24                          int flag, void *cb_data)
  25{
  26        const char *pattern = cb_data;
  27
  28        if (!fnmatch(pattern, refname, 0))
  29                printf("%s\n", refname);
  30
  31        return 0;
  32}
  33
  34static int list_replace_refs(const char *pattern)
  35{
  36        if (pattern == NULL)
  37                pattern = "*";
  38
  39        for_each_replace_ref(show_reference, (void *) pattern);
  40
  41        return 0;
  42}
  43
  44typedef int (*each_replace_name_fn)(const char *name, const char *ref,
  45                                    const unsigned char *sha1);
  46
  47static int for_each_replace_name(const char **argv, each_replace_name_fn fn)
  48{
  49        const char **p;
  50        char ref[PATH_MAX];
  51        int had_error = 0;
  52        unsigned char sha1[20];
  53
  54        for (p = argv; *p; p++) {
  55                if (snprintf(ref, sizeof(ref), "refs/replace/%s", *p)
  56                                        >= sizeof(ref)) {
  57                        error("replace ref name too long: %.*s...", 50, *p);
  58                        had_error = 1;
  59                        continue;
  60                }
  61                if (!resolve_ref(ref, sha1, 1, NULL)) {
  62                        error("replace ref '%s' not found.", *p);
  63                        had_error = 1;
  64                        continue;
  65                }
  66                if (fn(*p, ref, sha1))
  67                        had_error = 1;
  68        }
  69        return had_error;
  70}
  71
  72static int delete_replace_ref(const char *name, const char *ref,
  73                              const unsigned char *sha1)
  74{
  75        if (delete_ref(ref, sha1, 0))
  76                return 1;
  77        printf("Deleted replace ref '%s'\n", name);
  78        return 0;
  79}
  80
  81static int replace_object(const char *object_ref, const char *replace_ref,
  82                          int force)
  83{
  84        unsigned char object[20], prev[20], repl[20];
  85        char ref[PATH_MAX];
  86        struct ref_lock *lock;
  87
  88        if (get_sha1(object_ref, object))
  89                die("Failed to resolve '%s' as a valid ref.", object_ref);
  90        if (get_sha1(replace_ref, repl))
  91                die("Failed to resolve '%s' as a valid ref.", replace_ref);
  92
  93        if (snprintf(ref, sizeof(ref),
  94                     "refs/replace/%s",
  95                     sha1_to_hex(object)) > sizeof(ref) - 1)
  96                die("replace ref name too long: %.*s...", 50, ref);
  97        if (check_ref_format(ref))
  98                die("'%s' is not a valid ref name.", ref);
  99
 100        if (!resolve_ref(ref, prev, 1, NULL))
 101                hashclr(prev);
 102        else if (!force)
 103                die("replace ref '%s' already exists", ref);
 104
 105        lock = lock_any_ref_for_update(ref, prev, 0);
 106        if (!lock)
 107                die("%s: cannot lock the ref", ref);
 108        if (write_ref_sha1(lock, repl, NULL) < 0)
 109                die("%s: cannot update the ref", ref);
 110
 111        return 0;
 112}
 113
 114int cmd_replace(int argc, const char **argv, const char *prefix)
 115{
 116        int list = 0, delete = 0, force = 0;
 117        struct option options[] = {
 118                OPT_BOOLEAN('l', NULL, &list, "list replace refs"),
 119                OPT_BOOLEAN('d', NULL, &delete, "delete replace refs"),
 120                OPT_BOOLEAN('f', NULL, &force, "replace the ref if it exists"),
 121                OPT_END()
 122        };
 123
 124        argc = parse_options(argc, argv, prefix, options, git_replace_usage, 0);
 125
 126        if (list && delete)
 127                usage_msg_opt("-l and -d cannot be used together",
 128                              git_replace_usage, options);
 129
 130        if (force && (list || delete))
 131                usage_msg_opt("-f cannot be used with -d or -l",
 132                              git_replace_usage, options);
 133
 134        /* Delete refs */
 135        if (delete) {
 136                if (argc < 1)
 137                        usage_msg_opt("-d needs at least one argument",
 138                                      git_replace_usage, options);
 139                return for_each_replace_name(argv, delete_replace_ref);
 140        }
 141
 142        /* Replace object */
 143        if (!list && argc) {
 144                if (argc != 2)
 145                        usage_msg_opt("bad number of arguments",
 146                                      git_replace_usage, options);
 147                return replace_object(argv[0], argv[1], force);
 148        }
 149
 150        /* List refs, even if "list" is not set */
 151        if (argc > 1)
 152                usage_msg_opt("only one pattern can be given with -l",
 153                              git_replace_usage, options);
 154        if (force)
 155                usage_msg_opt("-f needs some arguments",
 156                              git_replace_usage, options);
 157
 158        return list_replace_refs(argv[0]);
 159}