Merge branch 'svn-crlf' of git://bogomips.org/git-svn into ew/svn-crlf
[git/git.git] / branch.c
1 #include "git-compat-util.h"
2 #include "cache.h"
3 #include "config.h"
4 #include "branch.h"
5 #include "refs.h"
6 #include "remote.h"
7 #include "commit.h"
8 #include "worktree.h"
9
10 struct tracking {
11 struct refspec spec;
12 char *src;
13 const char *remote;
14 int matches;
15 };
16
17 static int find_tracked_branch(struct remote *remote, void *priv)
18 {
19 struct tracking *tracking = priv;
20
21 if (!remote_find_tracking(remote, &tracking->spec)) {
22 if (++tracking->matches == 1) {
23 tracking->src = tracking->spec.src;
24 tracking->remote = remote->name;
25 } else {
26 free(tracking->spec.src);
27 if (tracking->src) {
28 FREE_AND_NULL(tracking->src);
29 }
30 }
31 tracking->spec.src = NULL;
32 }
33
34 return 0;
35 }
36
37 static int should_setup_rebase(const char *origin)
38 {
39 switch (autorebase) {
40 case AUTOREBASE_NEVER:
41 return 0;
42 case AUTOREBASE_LOCAL:
43 return origin == NULL;
44 case AUTOREBASE_REMOTE:
45 return origin != NULL;
46 case AUTOREBASE_ALWAYS:
47 return 1;
48 }
49 return 0;
50 }
51
52 static const char tracking_advice[] =
53 N_("\n"
54 "After fixing the error cause you may try to fix up\n"
55 "the remote tracking information by invoking\n"
56 "\"git branch --set-upstream-to=%s%s%s\".");
57
58 int install_branch_config(int flag, const char *local, const char *origin, const char *remote)
59 {
60 const char *shortname = NULL;
61 struct strbuf key = STRBUF_INIT;
62 int rebasing = should_setup_rebase(origin);
63
64 if (skip_prefix(remote, "refs/heads/", &shortname)
65 && !strcmp(local, shortname)
66 && !origin) {
67 warning(_("Not setting branch %s as its own upstream."),
68 local);
69 return 0;
70 }
71
72 strbuf_addf(&key, "branch.%s.remote", local);
73 if (git_config_set_gently(key.buf, origin ? origin : ".") < 0)
74 goto out_err;
75
76 strbuf_reset(&key);
77 strbuf_addf(&key, "branch.%s.merge", local);
78 if (git_config_set_gently(key.buf, remote) < 0)
79 goto out_err;
80
81 if (rebasing) {
82 strbuf_reset(&key);
83 strbuf_addf(&key, "branch.%s.rebase", local);
84 if (git_config_set_gently(key.buf, "true") < 0)
85 goto out_err;
86 }
87 strbuf_release(&key);
88
89 if (flag & BRANCH_CONFIG_VERBOSE) {
90 if (shortname) {
91 if (origin)
92 printf_ln(rebasing ?
93 _("Branch '%s' set up to track remote branch '%s' from '%s' by rebasing.") :
94 _("Branch '%s' set up to track remote branch '%s' from '%s'."),
95 local, shortname, origin);
96 else
97 printf_ln(rebasing ?
98 _("Branch '%s' set up to track local branch '%s' by rebasing.") :
99 _("Branch '%s' set up to track local branch '%s'."),
100 local, shortname);
101 } else {
102 if (origin)
103 printf_ln(rebasing ?
104 _("Branch '%s' set up to track remote ref '%s' by rebasing.") :
105 _("Branch '%s' set up to track remote ref '%s'."),
106 local, remote);
107 else
108 printf_ln(rebasing ?
109 _("Branch '%s' set up to track local ref '%s' by rebasing.") :
110 _("Branch '%s' set up to track local ref '%s'."),
111 local, remote);
112 }
113 }
114
115 return 0;
116
117 out_err:
118 strbuf_release(&key);
119 error(_("Unable to write upstream branch configuration"));
120
121 advise(_(tracking_advice),
122 origin ? origin : "",
123 origin ? "/" : "",
124 shortname ? shortname : remote);
125
126 return -1;
127 }
128
129 /*
130 * This is called when new_ref is branched off of orig_ref, and tries
131 * to infer the settings for branch.<new_ref>.{remote,merge} from the
132 * config.
133 */
134 static void setup_tracking(const char *new_ref, const char *orig_ref,
135 enum branch_track track, int quiet)
136 {
137 struct tracking tracking;
138 int config_flags = quiet ? 0 : BRANCH_CONFIG_VERBOSE;
139
140 memset(&tracking, 0, sizeof(tracking));
141 tracking.spec.dst = (char *)orig_ref;
142 if (for_each_remote(find_tracked_branch, &tracking))
143 return;
144
145 if (!tracking.matches)
146 switch (track) {
147 case BRANCH_TRACK_ALWAYS:
148 case BRANCH_TRACK_EXPLICIT:
149 case BRANCH_TRACK_OVERRIDE:
150 break;
151 default:
152 return;
153 }
154
155 if (tracking.matches > 1)
156 die(_("Not tracking: ambiguous information for ref %s"),
157 orig_ref);
158
159 if (install_branch_config(config_flags, new_ref, tracking.remote,
160 tracking.src ? tracking.src : orig_ref) < 0)
161 exit(-1);
162
163 free(tracking.src);
164 }
165
166 int read_branch_desc(struct strbuf *buf, const char *branch_name)
167 {
168 char *v = NULL;
169 struct strbuf name = STRBUF_INIT;
170 strbuf_addf(&name, "branch.%s.description", branch_name);
171 if (git_config_get_string(name.buf, &v)) {
172 strbuf_release(&name);
173 return -1;
174 }
175 strbuf_addstr(buf, v);
176 free(v);
177 strbuf_release(&name);
178 return 0;
179 }
180
181 /*
182 * Check if 'name' can be a valid name for a branch; die otherwise.
183 * Return 1 if the named branch already exists; return 0 otherwise.
184 * Fill ref with the full refname for the branch.
185 */
186 int validate_branchname(const char *name, struct strbuf *ref)
187 {
188 if (strbuf_check_branch_ref(ref, name))
189 die(_("'%s' is not a valid branch name."), name);
190
191 return ref_exists(ref->buf);
192 }
193
194 /*
195 * Check if a branch 'name' can be created as a new branch; die otherwise.
196 * 'force' can be used when it is OK for the named branch already exists.
197 * Return 1 if the named branch already exists; return 0 otherwise.
198 * Fill ref with the full refname for the branch.
199 */
200 int validate_new_branchname(const char *name, struct strbuf *ref, int force)
201 {
202 const char *head;
203
204 if (!validate_branchname(name, ref))
205 return 0;
206
207 if (!force)
208 die(_("A branch named '%s' already exists."),
209 ref->buf + strlen("refs/heads/"));
210
211 head = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
212 if (!is_bare_repository() && head && !strcmp(head, ref->buf))
213 die(_("Cannot force update the current branch."));
214
215 return 1;
216 }
217
218 static int check_tracking_branch(struct remote *remote, void *cb_data)
219 {
220 char *tracking_branch = cb_data;
221 struct refspec query;
222 memset(&query, 0, sizeof(struct refspec));
223 query.dst = tracking_branch;
224 return !remote_find_tracking(remote, &query);
225 }
226
227 static int validate_remote_tracking_branch(char *ref)
228 {
229 return !for_each_remote(check_tracking_branch, ref);
230 }
231
232 static const char upstream_not_branch[] =
233 N_("Cannot setup tracking information; starting point '%s' is not a branch.");
234 static const char upstream_missing[] =
235 N_("the requested upstream branch '%s' does not exist");
236 static const char upstream_advice[] =
237 N_("\n"
238 "If you are planning on basing your work on an upstream\n"
239 "branch that already exists at the remote, you may need to\n"
240 "run \"git fetch\" to retrieve it.\n"
241 "\n"
242 "If you are planning to push out a new local branch that\n"
243 "will track its remote counterpart, you may want to use\n"
244 "\"git push -u\" to set the upstream config as you push.");
245
246 void create_branch(const char *name, const char *start_name,
247 int force, int reflog, int clobber_head,
248 int quiet, enum branch_track track)
249 {
250 struct commit *commit;
251 struct object_id oid;
252 char *real_ref;
253 struct strbuf ref = STRBUF_INIT;
254 int forcing = 0;
255 int dont_change_ref = 0;
256 int explicit_tracking = 0;
257
258 if (track == BRANCH_TRACK_EXPLICIT || track == BRANCH_TRACK_OVERRIDE)
259 explicit_tracking = 1;
260
261 if ((track == BRANCH_TRACK_OVERRIDE || clobber_head)
262 ? validate_branchname(name, &ref)
263 : validate_new_branchname(name, &ref, force)) {
264 if (!force)
265 dont_change_ref = 1;
266 else
267 forcing = 1;
268 }
269
270 real_ref = NULL;
271 if (get_oid(start_name, &oid)) {
272 if (explicit_tracking) {
273 if (advice_set_upstream_failure) {
274 error(_(upstream_missing), start_name);
275 advise(_(upstream_advice));
276 exit(1);
277 }
278 die(_(upstream_missing), start_name);
279 }
280 die(_("Not a valid object name: '%s'."), start_name);
281 }
282
283 switch (dwim_ref(start_name, strlen(start_name), &oid, &real_ref)) {
284 case 0:
285 /* Not branching from any existing branch */
286 if (explicit_tracking)
287 die(_(upstream_not_branch), start_name);
288 break;
289 case 1:
290 /* Unique completion -- good, only if it is a real branch */
291 if (!starts_with(real_ref, "refs/heads/") &&
292 validate_remote_tracking_branch(real_ref)) {
293 if (explicit_tracking)
294 die(_(upstream_not_branch), start_name);
295 else
296 real_ref = NULL;
297 }
298 break;
299 default:
300 die(_("Ambiguous object name: '%s'."), start_name);
301 break;
302 }
303
304 if ((commit = lookup_commit_reference(&oid)) == NULL)
305 die(_("Not a valid branch point: '%s'."), start_name);
306 oidcpy(&oid, &commit->object.oid);
307
308 if (reflog)
309 log_all_ref_updates = LOG_REFS_NORMAL;
310
311 if (!dont_change_ref) {
312 struct ref_transaction *transaction;
313 struct strbuf err = STRBUF_INIT;
314 char *msg;
315
316 if (forcing)
317 msg = xstrfmt("branch: Reset to %s", start_name);
318 else
319 msg = xstrfmt("branch: Created from %s", start_name);
320
321 transaction = ref_transaction_begin(&err);
322 if (!transaction ||
323 ref_transaction_update(transaction, ref.buf,
324 &oid, forcing ? NULL : &null_oid,
325 0, msg, &err) ||
326 ref_transaction_commit(transaction, &err))
327 die("%s", err.buf);
328 ref_transaction_free(transaction);
329 strbuf_release(&err);
330 free(msg);
331 }
332
333 if (real_ref && track)
334 setup_tracking(ref.buf + 11, real_ref, track, quiet);
335
336 strbuf_release(&ref);
337 free(real_ref);
338 }
339
340 void remove_branch_state(void)
341 {
342 unlink(git_path_cherry_pick_head());
343 unlink(git_path_revert_head());
344 unlink(git_path_merge_head());
345 unlink(git_path_merge_rr());
346 unlink(git_path_merge_msg());
347 unlink(git_path_merge_mode());
348 unlink(git_path_squash_msg());
349 }
350
351 void die_if_checked_out(const char *branch, int ignore_current_worktree)
352 {
353 const struct worktree *wt;
354
355 wt = find_shared_symref("HEAD", branch);
356 if (!wt || (ignore_current_worktree && wt->is_current))
357 return;
358 skip_prefix(branch, "refs/heads/", &branch);
359 die(_("'%s' is already checked out at '%s'"),
360 branch, wt->path);
361 }
362
363 int replace_each_worktree_head_symref(const char *oldref, const char *newref,
364 const char *logmsg)
365 {
366 int ret = 0;
367 struct worktree **worktrees = get_worktrees(0);
368 int i;
369
370 for (i = 0; worktrees[i]; i++) {
371 struct ref_store *refs;
372
373 if (worktrees[i]->is_detached)
374 continue;
375 if (!worktrees[i]->head_ref)
376 continue;
377 if (strcmp(oldref, worktrees[i]->head_ref))
378 continue;
379
380 refs = get_worktree_ref_store(worktrees[i]);
381 if (refs_create_symref(refs, "HEAD", newref, logmsg))
382 ret = error(_("HEAD of working tree %s is not updated"),
383 worktrees[i]->path);
384 }
385
386 free_worktrees(worktrees);
387 return ret;
388 }