compat/bswap.h: fix endianness detection
[git/git.git] / builtin / update-ref.c
1 #include "cache.h"
2 #include "refs.h"
3 #include "builtin.h"
4 #include "parse-options.h"
5 #include "quote.h"
6 #include "argv-array.h"
7
8 static const char * const git_update_ref_usage[] = {
9 N_("git update-ref [options] -d <refname> [<oldval>]"),
10 N_("git update-ref [options] <refname> <newval> [<oldval>]"),
11 N_("git update-ref [options] --stdin [-z]"),
12 NULL
13 };
14
15 static int updates_alloc;
16 static int updates_count;
17 static const struct ref_update **updates;
18
19 static char line_termination = '\n';
20 static int update_flags;
21
22 static struct ref_update *update_alloc(void)
23 {
24 struct ref_update *update;
25
26 /* Allocate and zero-init a struct ref_update */
27 update = xcalloc(1, sizeof(*update));
28 ALLOC_GROW(updates, updates_count + 1, updates_alloc);
29 updates[updates_count++] = update;
30
31 /* Store and reset accumulated options */
32 update->flags = update_flags;
33 update_flags = 0;
34
35 return update;
36 }
37
38 static void update_store_ref_name(struct ref_update *update,
39 const char *ref_name)
40 {
41 if (check_refname_format(ref_name, REFNAME_ALLOW_ONELEVEL))
42 die("invalid ref format: %s", ref_name);
43 update->ref_name = xstrdup(ref_name);
44 }
45
46 static void update_store_new_sha1(struct ref_update *update,
47 const char *newvalue)
48 {
49 if (*newvalue && get_sha1(newvalue, update->new_sha1))
50 die("invalid new value for ref %s: %s",
51 update->ref_name, newvalue);
52 }
53
54 static void update_store_old_sha1(struct ref_update *update,
55 const char *oldvalue)
56 {
57 if (*oldvalue && get_sha1(oldvalue, update->old_sha1))
58 die("invalid old value for ref %s: %s",
59 update->ref_name, oldvalue);
60
61 /* We have an old value if non-empty, or if empty without -z */
62 update->have_old = *oldvalue || line_termination;
63 }
64
65 static const char *parse_arg(const char *next, struct strbuf *arg)
66 {
67 /* Parse SP-terminated, possibly C-quoted argument */
68 if (*next != '"')
69 while (*next && !isspace(*next))
70 strbuf_addch(arg, *next++);
71 else if (unquote_c_style(arg, next, &next))
72 die("badly quoted argument: %s", next);
73
74 /* Return position after the argument */
75 return next;
76 }
77
78 static const char *parse_first_arg(const char *next, struct strbuf *arg)
79 {
80 /* Parse argument immediately after "command SP" */
81 strbuf_reset(arg);
82 if (line_termination) {
83 /* Without -z, use the next argument */
84 next = parse_arg(next, arg);
85 } else {
86 /* With -z, use rest of first NUL-terminated line */
87 strbuf_addstr(arg, next);
88 next = next + arg->len;
89 }
90 return next;
91 }
92
93 static const char *parse_next_arg(const char *next, struct strbuf *arg)
94 {
95 /* Parse next SP-terminated or NUL-terminated argument, if any */
96 strbuf_reset(arg);
97 if (line_termination) {
98 /* Without -z, consume SP and use next argument */
99 if (!*next)
100 return NULL;
101 if (*next != ' ')
102 die("expected SP but got: %s", next);
103 next = parse_arg(next + 1, arg);
104 } else {
105 /* With -z, read the next NUL-terminated line */
106 if (*next)
107 die("expected NUL but got: %s", next);
108 if (strbuf_getline(arg, stdin, '\0') == EOF)
109 return NULL;
110 next = arg->buf + arg->len;
111 }
112 return next;
113 }
114
115 static void parse_cmd_update(const char *next)
116 {
117 struct strbuf ref = STRBUF_INIT;
118 struct strbuf newvalue = STRBUF_INIT;
119 struct strbuf oldvalue = STRBUF_INIT;
120 struct ref_update *update;
121
122 update = update_alloc();
123
124 if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
125 update_store_ref_name(update, ref.buf);
126 else
127 die("update line missing <ref>");
128
129 if ((next = parse_next_arg(next, &newvalue)) != NULL)
130 update_store_new_sha1(update, newvalue.buf);
131 else
132 die("update %s missing <newvalue>", ref.buf);
133
134 if ((next = parse_next_arg(next, &oldvalue)) != NULL)
135 update_store_old_sha1(update, oldvalue.buf);
136 else if(!line_termination)
137 die("update %s missing [<oldvalue>] NUL", ref.buf);
138
139 if (next && *next)
140 die("update %s has extra input: %s", ref.buf, next);
141 }
142
143 static void parse_cmd_create(const char *next)
144 {
145 struct strbuf ref = STRBUF_INIT;
146 struct strbuf newvalue = STRBUF_INIT;
147 struct ref_update *update;
148
149 update = update_alloc();
150 update->have_old = 1;
151
152 if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
153 update_store_ref_name(update, ref.buf);
154 else
155 die("create line missing <ref>");
156
157 if ((next = parse_next_arg(next, &newvalue)) != NULL)
158 update_store_new_sha1(update, newvalue.buf);
159 else
160 die("create %s missing <newvalue>", ref.buf);
161 if (is_null_sha1(update->new_sha1))
162 die("create %s given zero new value", ref.buf);
163
164 if (next && *next)
165 die("create %s has extra input: %s", ref.buf, next);
166 }
167
168 static void parse_cmd_delete(const char *next)
169 {
170 struct strbuf ref = STRBUF_INIT;
171 struct strbuf oldvalue = STRBUF_INIT;
172 struct ref_update *update;
173
174 update = update_alloc();
175
176 if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
177 update_store_ref_name(update, ref.buf);
178 else
179 die("delete line missing <ref>");
180
181 if ((next = parse_next_arg(next, &oldvalue)) != NULL)
182 update_store_old_sha1(update, oldvalue.buf);
183 else if(!line_termination)
184 die("delete %s missing [<oldvalue>] NUL", ref.buf);
185 if (update->have_old && is_null_sha1(update->old_sha1))
186 die("delete %s given zero old value", ref.buf);
187
188 if (next && *next)
189 die("delete %s has extra input: %s", ref.buf, next);
190 }
191
192 static void parse_cmd_verify(const char *next)
193 {
194 struct strbuf ref = STRBUF_INIT;
195 struct strbuf value = STRBUF_INIT;
196 struct ref_update *update;
197
198 update = update_alloc();
199
200 if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
201 update_store_ref_name(update, ref.buf);
202 else
203 die("verify line missing <ref>");
204
205 if ((next = parse_next_arg(next, &value)) != NULL) {
206 update_store_old_sha1(update, value.buf);
207 update_store_new_sha1(update, value.buf);
208 } else if(!line_termination)
209 die("verify %s missing [<oldvalue>] NUL", ref.buf);
210
211 if (next && *next)
212 die("verify %s has extra input: %s", ref.buf, next);
213 }
214
215 static void parse_cmd_option(const char *next)
216 {
217 if (!strcmp(next, "no-deref"))
218 update_flags |= REF_NODEREF;
219 else
220 die("option unknown: %s", next);
221 }
222
223 static void update_refs_stdin(void)
224 {
225 struct strbuf cmd = STRBUF_INIT;
226
227 /* Read each line dispatch its command */
228 while (strbuf_getline(&cmd, stdin, line_termination) != EOF)
229 if (!cmd.buf[0])
230 die("empty command in input");
231 else if (isspace(*cmd.buf))
232 die("whitespace before command: %s", cmd.buf);
233 else if (starts_with(cmd.buf, "update "))
234 parse_cmd_update(cmd.buf + 7);
235 else if (starts_with(cmd.buf, "create "))
236 parse_cmd_create(cmd.buf + 7);
237 else if (starts_with(cmd.buf, "delete "))
238 parse_cmd_delete(cmd.buf + 7);
239 else if (starts_with(cmd.buf, "verify "))
240 parse_cmd_verify(cmd.buf + 7);
241 else if (starts_with(cmd.buf, "option "))
242 parse_cmd_option(cmd.buf + 7);
243 else
244 die("unknown command: %s", cmd.buf);
245
246 strbuf_release(&cmd);
247 }
248
249 int cmd_update_ref(int argc, const char **argv, const char *prefix)
250 {
251 const char *refname, *oldval, *msg = NULL;
252 unsigned char sha1[20], oldsha1[20];
253 int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0, flags = 0;
254 struct option options[] = {
255 OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the update")),
256 OPT_BOOL('d', NULL, &delete, N_("delete the reference")),
257 OPT_BOOL( 0 , "no-deref", &no_deref,
258 N_("update <refname> not the one it points to")),
259 OPT_BOOL('z', NULL, &end_null, N_("stdin has NUL-terminated arguments")),
260 OPT_BOOL( 0 , "stdin", &read_stdin, N_("read updates from stdin")),
261 OPT_END(),
262 };
263
264 git_config(git_default_config, NULL);
265 argc = parse_options(argc, argv, prefix, options, git_update_ref_usage,
266 0);
267 if (msg && !*msg)
268 die("Refusing to perform update with empty message.");
269
270 if (read_stdin) {
271 if (delete || no_deref || argc > 0)
272 usage_with_options(git_update_ref_usage, options);
273 if (end_null)
274 line_termination = '\0';
275 update_refs_stdin();
276 return update_refs(msg, updates, updates_count, DIE_ON_ERR);
277 }
278
279 if (end_null)
280 usage_with_options(git_update_ref_usage, options);
281
282 if (delete) {
283 if (argc < 1 || argc > 2)
284 usage_with_options(git_update_ref_usage, options);
285 refname = argv[0];
286 oldval = argv[1];
287 } else {
288 const char *value;
289 if (argc < 2 || argc > 3)
290 usage_with_options(git_update_ref_usage, options);
291 refname = argv[0];
292 value = argv[1];
293 oldval = argv[2];
294 if (get_sha1(value, sha1))
295 die("%s: not a valid SHA1", value);
296 }
297
298 hashclr(oldsha1); /* all-zero hash in case oldval is the empty string */
299 if (oldval && *oldval && get_sha1(oldval, oldsha1))
300 die("%s: not a valid old SHA1", oldval);
301
302 if (no_deref)
303 flags = REF_NODEREF;
304 if (delete)
305 return delete_ref(refname, oldval ? oldsha1 : NULL, flags);
306 else
307 return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
308 flags, DIE_ON_ERR);
309 }