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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 | ||
16 | static const char * const git_replace_usage[] = { | |
17 | N_("git replace [-f] <object> <replacement>"), | |
18 | N_("git replace -d <object>..."), | |
19 | N_("git replace -l [<pattern>]"), | |
20 | NULL | |
21 | }; | |
22 | ||
23 | static 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 | ||
34 | static 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 | ||
44 | typedef int (*each_replace_name_fn)(const char *name, const char *ref, | |
45 | const unsigned char *sha1); | |
46 | ||
47 | static int for_each_replace_name(const char **argv, each_replace_name_fn fn) | |
48 | { | |
49 | const char **p, *full_hex; | |
50 | char ref[PATH_MAX]; | |
51 | int had_error = 0; | |
52 | unsigned char sha1[20]; | |
53 | ||
54 | for (p = argv; *p; p++) { | |
55 | if (get_sha1(*p, sha1)) { | |
56 | error("Failed to resolve '%s' as a valid ref.", *p); | |
57 | had_error = 1; | |
58 | continue; | |
59 | } | |
60 | full_hex = sha1_to_hex(sha1); | |
61 | snprintf(ref, sizeof(ref), "refs/replace/%s", full_hex); | |
62 | /* read_ref() may reuse the buffer */ | |
63 | full_hex = ref + strlen("refs/replace/"); | |
64 | if (read_ref(ref, sha1)) { | |
65 | error("replace ref '%s' not found.", full_hex); | |
66 | had_error = 1; | |
67 | continue; | |
68 | } | |
69 | if (fn(full_hex, ref, sha1)) | |
70 | had_error = 1; | |
71 | } | |
72 | return had_error; | |
73 | } | |
74 | ||
75 | static int delete_replace_ref(const char *name, const char *ref, | |
76 | const unsigned char *sha1) | |
77 | { | |
78 | if (delete_ref(ref, sha1, 0)) | |
79 | return 1; | |
80 | printf("Deleted replace ref '%s'\n", name); | |
81 | return 0; | |
82 | } | |
83 | ||
84 | static int replace_object(const char *object_ref, const char *replace_ref, | |
85 | int force) | |
86 | { | |
87 | unsigned char object[20], prev[20], repl[20]; | |
88 | char ref[PATH_MAX]; | |
89 | struct ref_lock *lock; | |
90 | ||
91 | if (get_sha1(object_ref, object)) | |
92 | die("Failed to resolve '%s' as a valid ref.", object_ref); | |
93 | if (get_sha1(replace_ref, repl)) | |
94 | die("Failed to resolve '%s' as a valid ref.", replace_ref); | |
95 | ||
96 | if (snprintf(ref, sizeof(ref), | |
97 | "refs/replace/%s", | |
98 | sha1_to_hex(object)) > sizeof(ref) - 1) | |
99 | die("replace ref name too long: %.*s...", 50, ref); | |
100 | if (check_refname_format(ref, 0)) | |
101 | die("'%s' is not a valid ref name.", ref); | |
102 | ||
103 | if (read_ref(ref, prev)) | |
104 | hashclr(prev); | |
105 | else if (!force) | |
106 | die("replace ref '%s' already exists", ref); | |
107 | ||
108 | lock = lock_any_ref_for_update(ref, prev, 0); | |
109 | if (!lock) | |
110 | die("%s: cannot lock the ref", ref); | |
111 | if (write_ref_sha1(lock, repl, NULL) < 0) | |
112 | die("%s: cannot update the ref", ref); | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | int cmd_replace(int argc, const char **argv, const char *prefix) | |
118 | { | |
119 | int list = 0, delete = 0, force = 0; | |
120 | struct option options[] = { | |
121 | OPT_BOOL('l', NULL, &list, N_("list replace refs")), | |
122 | OPT_BOOL('d', NULL, &delete, N_("delete replace refs")), | |
123 | OPT_BOOL('f', NULL, &force, N_("replace the ref if it exists")), | |
124 | OPT_END() | |
125 | }; | |
126 | ||
127 | argc = parse_options(argc, argv, prefix, options, git_replace_usage, 0); | |
128 | ||
129 | if (list && delete) | |
130 | usage_msg_opt("-l and -d cannot be used together", | |
131 | git_replace_usage, options); | |
132 | ||
133 | if (force && (list || delete)) | |
134 | usage_msg_opt("-f cannot be used with -d or -l", | |
135 | git_replace_usage, options); | |
136 | ||
137 | /* Delete refs */ | |
138 | if (delete) { | |
139 | if (argc < 1) | |
140 | usage_msg_opt("-d needs at least one argument", | |
141 | git_replace_usage, options); | |
142 | return for_each_replace_name(argv, delete_replace_ref); | |
143 | } | |
144 | ||
145 | /* Replace object */ | |
146 | if (!list && argc) { | |
147 | if (argc != 2) | |
148 | usage_msg_opt("bad number of arguments", | |
149 | git_replace_usage, options); | |
150 | return replace_object(argv[0], argv[1], force); | |
151 | } | |
152 | ||
153 | /* List refs, even if "list" is not set */ | |
154 | if (argc > 1) | |
155 | usage_msg_opt("only one pattern can be given with -l", | |
156 | git_replace_usage, options); | |
157 | if (force) | |
158 | usage_msg_opt("-f needs some arguments", | |
159 | git_replace_usage, options); | |
160 | ||
161 | return list_replace_refs(argv[0]); | |
162 | } |