add 'git credential' plumbing command
[git/git.git] / builtin / replace.c
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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[] = {
bebdd271 17 "git replace [-f] <object> <replacement>",
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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 }
c6893323 61 if (read_ref(ref, sha1)) {
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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
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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);
8d9c5010 97 if (check_refname_format(ref, 0))
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98 die("'%s' is not a valid ref name.", ref);
99
c6893323 100 if (read_ref(ref, prev))
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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
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114int cmd_replace(int argc, const char **argv, const char *prefix)
115{
bebdd271 116 int list = 0, delete = 0, force = 0;
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117 struct option options[] = {
118 OPT_BOOLEAN('l', NULL, &list, "list replace refs"),
119 OPT_BOOLEAN('d', NULL, &delete, "delete replace refs"),
bebdd271 120 OPT_BOOLEAN('f', NULL, &force, "replace the ref if it exists"),
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121 OPT_END()
122 };
123
451bb210 124 argc = parse_options(argc, argv, prefix, options, git_replace_usage, 0);
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125
126 if (list && delete)
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127 usage_msg_opt("-l and -d cannot be used together",
128 git_replace_usage, options);
54b0c1e0 129
bebdd271 130 if (force && (list || delete))
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131 usage_msg_opt("-f cannot be used with -d or -l",
132 git_replace_usage, options);
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133
134 /* Delete refs */
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135 if (delete) {
136 if (argc < 1)
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137 usage_msg_opt("-d needs at least one argument",
138 git_replace_usage, options);
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139 return for_each_replace_name(argv, delete_replace_ref);
140 }
141
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142 /* Replace object */
143 if (!list && argc) {
144 if (argc != 2)
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145 usage_msg_opt("bad number of arguments",
146 git_replace_usage, options);
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147 return replace_object(argv[0], argv[1], force);
148 }
149
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150 /* List refs, even if "list" is not set */
151 if (argc > 1)
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152 usage_msg_opt("only one pattern can be given with -l",
153 git_replace_usage, options);
bebdd271 154 if (force)
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155 usage_msg_opt("-f needs some arguments",
156 git_replace_usage, options);
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157
158 return list_replace_refs(argv[0]);
159}