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1 | #include "cache.h" | |
2 | #include "branch.h" | |
3 | #include "refs.h" | |
4 | #include "remote.h" | |
5 | #include "commit.h" | |
6 | ||
7 | struct tracking { | |
8 | struct refspec spec; | |
9 | char *src; | |
10 | const char *remote; | |
11 | int matches; | |
12 | }; | |
13 | ||
14 | static int find_tracked_branch(struct remote *remote, void *priv) | |
15 | { | |
16 | struct tracking *tracking = priv; | |
17 | ||
18 | if (!remote_find_tracking(remote, &tracking->spec)) { | |
19 | if (++tracking->matches == 1) { | |
20 | tracking->src = tracking->spec.src; | |
21 | tracking->remote = remote->name; | |
22 | } else { | |
23 | free(tracking->spec.src); | |
24 | if (tracking->src) { | |
25 | free(tracking->src); | |
26 | tracking->src = NULL; | |
27 | } | |
28 | } | |
29 | tracking->spec.src = NULL; | |
30 | } | |
31 | ||
32 | return 0; | |
33 | } | |
34 | ||
35 | static int should_setup_rebase(const char *origin) | |
36 | { | |
37 | switch (autorebase) { | |
38 | case AUTOREBASE_NEVER: | |
39 | return 0; | |
40 | case AUTOREBASE_LOCAL: | |
41 | return origin == NULL; | |
42 | case AUTOREBASE_REMOTE: | |
43 | return origin != NULL; | |
44 | case AUTOREBASE_ALWAYS: | |
45 | return 1; | |
46 | } | |
47 | return 0; | |
48 | } | |
49 | ||
50 | void install_branch_config(int flag, const char *local, const char *origin, const char *remote) | |
51 | { | |
52 | const char *shortname = remote + 11; | |
53 | int remote_is_branch = !prefixcmp(remote, "refs/heads/"); | |
54 | struct strbuf key = STRBUF_INIT; | |
55 | int rebasing = should_setup_rebase(origin); | |
56 | ||
57 | if (remote_is_branch | |
58 | && !strcmp(local, shortname) | |
59 | && !origin) { | |
60 | warning("Not setting branch %s as its own upstream.", | |
61 | local); | |
62 | return; | |
63 | } | |
64 | ||
65 | strbuf_addf(&key, "branch.%s.remote", local); | |
66 | git_config_set(key.buf, origin ? origin : "."); | |
67 | ||
68 | strbuf_reset(&key); | |
69 | strbuf_addf(&key, "branch.%s.merge", local); | |
70 | git_config_set(key.buf, remote); | |
71 | ||
72 | if (rebasing) { | |
73 | strbuf_reset(&key); | |
74 | strbuf_addf(&key, "branch.%s.rebase", local); | |
75 | git_config_set(key.buf, "true"); | |
76 | } | |
77 | strbuf_release(&key); | |
78 | ||
79 | if (flag & BRANCH_CONFIG_VERBOSE) { | |
80 | if (remote_is_branch && origin) | |
81 | printf(rebasing ? | |
82 | "Branch %s set up to track remote branch %s from %s by rebasing.\n" : | |
83 | "Branch %s set up to track remote branch %s from %s.\n", | |
84 | local, shortname, origin); | |
85 | else if (remote_is_branch && !origin) | |
86 | printf(rebasing ? | |
87 | "Branch %s set up to track local branch %s by rebasing.\n" : | |
88 | "Branch %s set up to track local branch %s.\n", | |
89 | local, shortname); | |
90 | else if (!remote_is_branch && origin) | |
91 | printf(rebasing ? | |
92 | "Branch %s set up to track remote ref %s by rebasing.\n" : | |
93 | "Branch %s set up to track remote ref %s.\n", | |
94 | local, remote); | |
95 | else if (!remote_is_branch && !origin) | |
96 | printf(rebasing ? | |
97 | "Branch %s set up to track local ref %s by rebasing.\n" : | |
98 | "Branch %s set up to track local ref %s.\n", | |
99 | local, remote); | |
100 | else | |
101 | die("BUG: impossible combination of %d and %p", | |
102 | remote_is_branch, origin); | |
103 | } | |
104 | } | |
105 | ||
106 | /* | |
107 | * This is called when new_ref is branched off of orig_ref, and tries | |
108 | * to infer the settings for branch.<new_ref>.{remote,merge} from the | |
109 | * config. | |
110 | */ | |
111 | static int setup_tracking(const char *new_ref, const char *orig_ref, | |
112 | enum branch_track track, int quiet) | |
113 | { | |
114 | struct tracking tracking; | |
115 | int config_flags = quiet ? 0 : BRANCH_CONFIG_VERBOSE; | |
116 | ||
117 | if (strlen(new_ref) > 1024 - 7 - 7 - 1) | |
118 | return error("Tracking not set up: name too long: %s", | |
119 | new_ref); | |
120 | ||
121 | memset(&tracking, 0, sizeof(tracking)); | |
122 | tracking.spec.dst = (char *)orig_ref; | |
123 | if (for_each_remote(find_tracked_branch, &tracking)) | |
124 | return 1; | |
125 | ||
126 | if (!tracking.matches) | |
127 | switch (track) { | |
128 | case BRANCH_TRACK_ALWAYS: | |
129 | case BRANCH_TRACK_EXPLICIT: | |
130 | case BRANCH_TRACK_OVERRIDE: | |
131 | break; | |
132 | default: | |
133 | return 1; | |
134 | } | |
135 | ||
136 | if (tracking.matches > 1) | |
137 | return error("Not tracking: ambiguous information for ref %s", | |
138 | orig_ref); | |
139 | ||
140 | install_branch_config(config_flags, new_ref, tracking.remote, | |
141 | tracking.src ? tracking.src : orig_ref); | |
142 | ||
143 | free(tracking.src); | |
144 | return 0; | |
145 | } | |
146 | ||
147 | struct branch_desc_cb { | |
148 | const char *config_name; | |
149 | const char *value; | |
150 | }; | |
151 | ||
152 | static int read_branch_desc_cb(const char *var, const char *value, void *cb) | |
153 | { | |
154 | struct branch_desc_cb *desc = cb; | |
155 | if (strcmp(desc->config_name, var)) | |
156 | return 0; | |
157 | free((char *)desc->value); | |
158 | return git_config_string(&desc->value, var, value); | |
159 | } | |
160 | ||
161 | int read_branch_desc(struct strbuf *buf, const char *branch_name) | |
162 | { | |
163 | struct branch_desc_cb cb; | |
164 | struct strbuf name = STRBUF_INIT; | |
165 | strbuf_addf(&name, "branch.%s.description", branch_name); | |
166 | cb.config_name = name.buf; | |
167 | cb.value = NULL; | |
168 | if (git_config(read_branch_desc_cb, &cb) < 0) { | |
169 | strbuf_release(&name); | |
170 | return -1; | |
171 | } | |
172 | if (cb.value) | |
173 | strbuf_addstr(buf, cb.value); | |
174 | strbuf_release(&name); | |
175 | return 0; | |
176 | } | |
177 | ||
178 | int validate_new_branchname(const char *name, struct strbuf *ref, | |
179 | int force, int attr_only) | |
180 | { | |
181 | if (strbuf_check_branch_ref(ref, name)) | |
182 | die("'%s' is not a valid branch name.", name); | |
183 | ||
184 | if (!ref_exists(ref->buf)) | |
185 | return 0; | |
186 | else if (!force && !attr_only) | |
187 | die("A branch named '%s' already exists.", ref->buf + strlen("refs/heads/")); | |
188 | ||
189 | if (!attr_only) { | |
190 | const char *head; | |
191 | unsigned char sha1[20]; | |
192 | ||
193 | head = resolve_ref_unsafe("HEAD", sha1, 0, NULL); | |
194 | if (!is_bare_repository() && head && !strcmp(head, ref->buf)) | |
195 | die("Cannot force update the current branch."); | |
196 | } | |
197 | return 1; | |
198 | } | |
199 | ||
200 | static const char upstream_not_branch[] = | |
201 | N_("Cannot setup tracking information; starting point '%s' is not a branch."); | |
202 | static const char upstream_missing[] = | |
203 | N_("the requested upstream branch '%s' does not exist"); | |
204 | static const char upstream_advice[] = | |
205 | N_("\n" | |
206 | "If you are planning on basing your work on an upstream\n" | |
207 | "branch that already exists at the remote, you may need to\n" | |
208 | "run \"git fetch\" to retrieve it.\n" | |
209 | "\n" | |
210 | "If you are planning to push out a new local branch that\n" | |
211 | "will track its remote counterpart, you may want to use\n" | |
212 | "\"git push -u\" to set the upstream config as you push."); | |
213 | ||
214 | void create_branch(const char *head, | |
215 | const char *name, const char *start_name, | |
216 | int force, int reflog, int clobber_head, | |
217 | int quiet, enum branch_track track) | |
218 | { | |
219 | struct ref_lock *lock = NULL; | |
220 | struct commit *commit; | |
221 | unsigned char sha1[20]; | |
222 | char *real_ref, msg[PATH_MAX + 20]; | |
223 | struct strbuf ref = STRBUF_INIT; | |
224 | int forcing = 0; | |
225 | int dont_change_ref = 0; | |
226 | int explicit_tracking = 0; | |
227 | ||
228 | if (track == BRANCH_TRACK_EXPLICIT || track == BRANCH_TRACK_OVERRIDE) | |
229 | explicit_tracking = 1; | |
230 | ||
231 | if (validate_new_branchname(name, &ref, force, | |
232 | track == BRANCH_TRACK_OVERRIDE || | |
233 | clobber_head)) { | |
234 | if (!force) | |
235 | dont_change_ref = 1; | |
236 | else | |
237 | forcing = 1; | |
238 | } | |
239 | ||
240 | real_ref = NULL; | |
241 | if (get_sha1(start_name, sha1)) { | |
242 | if (explicit_tracking) { | |
243 | if (advice_set_upstream_failure) { | |
244 | error(_(upstream_missing), start_name); | |
245 | advise(_(upstream_advice)); | |
246 | exit(1); | |
247 | } | |
248 | die(_(upstream_missing), start_name); | |
249 | } | |
250 | die("Not a valid object name: '%s'.", start_name); | |
251 | } | |
252 | ||
253 | switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) { | |
254 | case 0: | |
255 | /* Not branching from any existing branch */ | |
256 | if (explicit_tracking) | |
257 | die(_(upstream_not_branch), start_name); | |
258 | break; | |
259 | case 1: | |
260 | /* Unique completion -- good, only if it is a real branch */ | |
261 | if (prefixcmp(real_ref, "refs/heads/") && | |
262 | prefixcmp(real_ref, "refs/remotes/")) { | |
263 | if (explicit_tracking) | |
264 | die(_(upstream_not_branch), start_name); | |
265 | else | |
266 | real_ref = NULL; | |
267 | } | |
268 | break; | |
269 | default: | |
270 | die("Ambiguous object name: '%s'.", start_name); | |
271 | break; | |
272 | } | |
273 | ||
274 | if ((commit = lookup_commit_reference(sha1)) == NULL) | |
275 | die("Not a valid branch point: '%s'.", start_name); | |
276 | hashcpy(sha1, commit->object.sha1); | |
277 | ||
278 | if (!dont_change_ref) { | |
279 | lock = lock_any_ref_for_update(ref.buf, NULL, 0); | |
280 | if (!lock) | |
281 | die_errno("Failed to lock ref for update"); | |
282 | } | |
283 | ||
284 | if (reflog) | |
285 | log_all_ref_updates = 1; | |
286 | ||
287 | if (forcing) | |
288 | snprintf(msg, sizeof msg, "branch: Reset to %s", | |
289 | start_name); | |
290 | else if (!dont_change_ref) | |
291 | snprintf(msg, sizeof msg, "branch: Created from %s", | |
292 | start_name); | |
293 | ||
294 | if (real_ref && track) | |
295 | setup_tracking(ref.buf+11, real_ref, track, quiet); | |
296 | ||
297 | if (!dont_change_ref) | |
298 | if (write_ref_sha1(lock, sha1, msg) < 0) | |
299 | die_errno("Failed to write ref"); | |
300 | ||
301 | strbuf_release(&ref); | |
302 | free(real_ref); | |
303 | } | |
304 | ||
305 | void remove_branch_state(void) | |
306 | { | |
307 | unlink(git_path("CHERRY_PICK_HEAD")); | |
308 | unlink(git_path("REVERT_HEAD")); | |
309 | unlink(git_path("MERGE_HEAD")); | |
310 | unlink(git_path("MERGE_RR")); | |
311 | unlink(git_path("MERGE_MSG")); | |
312 | unlink(git_path("MERGE_MODE")); | |
313 | unlink(git_path("SQUASH_MSG")); | |
314 | } |