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1 | #include "git-compat-util.h" | |
2 | #include "cache.h" | |
3 | #include "branch.h" | |
4 | #include "refs.h" | |
5 | #include "remote.h" | |
6 | #include "commit.h" | |
7 | ||
8 | struct tracking { | |
9 | struct refspec spec; | |
10 | char *src; | |
11 | const char *remote; | |
12 | int matches; | |
13 | }; | |
14 | ||
15 | static int find_tracked_branch(struct remote *remote, void *priv) | |
16 | { | |
17 | struct tracking *tracking = priv; | |
18 | ||
19 | if (!remote_find_tracking(remote, &tracking->spec)) { | |
20 | if (++tracking->matches == 1) { | |
21 | tracking->src = tracking->spec.src; | |
22 | tracking->remote = remote->name; | |
23 | } else { | |
24 | free(tracking->spec.src); | |
25 | if (tracking->src) { | |
26 | free(tracking->src); | |
27 | tracking->src = NULL; | |
28 | } | |
29 | } | |
30 | tracking->spec.src = NULL; | |
31 | } | |
32 | ||
33 | return 0; | |
34 | } | |
35 | ||
36 | static int should_setup_rebase(const char *origin) | |
37 | { | |
38 | switch (autorebase) { | |
39 | case AUTOREBASE_NEVER: | |
40 | return 0; | |
41 | case AUTOREBASE_LOCAL: | |
42 | return origin == NULL; | |
43 | case AUTOREBASE_REMOTE: | |
44 | return origin != NULL; | |
45 | case AUTOREBASE_ALWAYS: | |
46 | return 1; | |
47 | } | |
48 | return 0; | |
49 | } | |
50 | ||
51 | void install_branch_config(int flag, const char *local, const char *origin, const char *remote) | |
52 | { | |
53 | const char *shortname = skip_prefix(remote, "refs/heads/"); | |
54 | struct strbuf key = STRBUF_INIT; | |
55 | int rebasing = should_setup_rebase(origin); | |
56 | ||
57 | if (shortname | |
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 (shortname) { | |
81 | if (origin) | |
82 | printf_ln(rebasing ? | |
83 | _("Branch %s set up to track remote branch %s from %s by rebasing.") : | |
84 | _("Branch %s set up to track remote branch %s from %s."), | |
85 | local, shortname, origin); | |
86 | else | |
87 | printf_ln(rebasing ? | |
88 | _("Branch %s set up to track local branch %s by rebasing.") : | |
89 | _("Branch %s set up to track local branch %s."), | |
90 | local, shortname); | |
91 | } else { | |
92 | if (origin) | |
93 | printf_ln(rebasing ? | |
94 | _("Branch %s set up to track remote ref %s by rebasing.") : | |
95 | _("Branch %s set up to track remote ref %s."), | |
96 | local, remote); | |
97 | else | |
98 | printf_ln(rebasing ? | |
99 | _("Branch %s set up to track local ref %s by rebasing.") : | |
100 | _("Branch %s set up to track local ref %s."), | |
101 | local, remote); | |
102 | } | |
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 | memset(&tracking, 0, sizeof(tracking)); | |
118 | tracking.spec.dst = (char *)orig_ref; | |
119 | if (for_each_remote(find_tracked_branch, &tracking)) | |
120 | return 1; | |
121 | ||
122 | if (!tracking.matches) | |
123 | switch (track) { | |
124 | case BRANCH_TRACK_ALWAYS: | |
125 | case BRANCH_TRACK_EXPLICIT: | |
126 | case BRANCH_TRACK_OVERRIDE: | |
127 | break; | |
128 | default: | |
129 | return 1; | |
130 | } | |
131 | ||
132 | if (tracking.matches > 1) | |
133 | return error(_("Not tracking: ambiguous information for ref %s"), | |
134 | orig_ref); | |
135 | ||
136 | install_branch_config(config_flags, new_ref, tracking.remote, | |
137 | tracking.src ? tracking.src : orig_ref); | |
138 | ||
139 | free(tracking.src); | |
140 | return 0; | |
141 | } | |
142 | ||
143 | struct branch_desc_cb { | |
144 | const char *config_name; | |
145 | const char *value; | |
146 | }; | |
147 | ||
148 | static int read_branch_desc_cb(const char *var, const char *value, void *cb) | |
149 | { | |
150 | struct branch_desc_cb *desc = cb; | |
151 | if (strcmp(desc->config_name, var)) | |
152 | return 0; | |
153 | free((char *)desc->value); | |
154 | return git_config_string(&desc->value, var, value); | |
155 | } | |
156 | ||
157 | int read_branch_desc(struct strbuf *buf, const char *branch_name) | |
158 | { | |
159 | struct branch_desc_cb cb; | |
160 | struct strbuf name = STRBUF_INIT; | |
161 | strbuf_addf(&name, "branch.%s.description", branch_name); | |
162 | cb.config_name = name.buf; | |
163 | cb.value = NULL; | |
164 | if (git_config(read_branch_desc_cb, &cb) < 0) { | |
165 | strbuf_release(&name); | |
166 | return -1; | |
167 | } | |
168 | if (cb.value) | |
169 | strbuf_addstr(buf, cb.value); | |
170 | strbuf_release(&name); | |
171 | return 0; | |
172 | } | |
173 | ||
174 | int validate_new_branchname(const char *name, struct strbuf *ref, | |
175 | int force, int attr_only) | |
176 | { | |
177 | if (strbuf_check_branch_ref(ref, name)) | |
178 | die(_("'%s' is not a valid branch name."), name); | |
179 | ||
180 | if (!ref_exists(ref->buf)) | |
181 | return 0; | |
182 | else if (!force && !attr_only) | |
183 | die(_("A branch named '%s' already exists."), ref->buf + strlen("refs/heads/")); | |
184 | ||
185 | if (!attr_only) { | |
186 | const char *head; | |
187 | unsigned char sha1[20]; | |
188 | ||
189 | head = resolve_ref_unsafe("HEAD", sha1, 0, NULL); | |
190 | if (!is_bare_repository() && head && !strcmp(head, ref->buf)) | |
191 | die(_("Cannot force update the current branch.")); | |
192 | } | |
193 | return 1; | |
194 | } | |
195 | ||
196 | static int check_tracking_branch(struct remote *remote, void *cb_data) | |
197 | { | |
198 | char *tracking_branch = cb_data; | |
199 | struct refspec query; | |
200 | memset(&query, 0, sizeof(struct refspec)); | |
201 | query.dst = tracking_branch; | |
202 | return !remote_find_tracking(remote, &query); | |
203 | } | |
204 | ||
205 | static int validate_remote_tracking_branch(char *ref) | |
206 | { | |
207 | return !for_each_remote(check_tracking_branch, ref); | |
208 | } | |
209 | ||
210 | static const char upstream_not_branch[] = | |
211 | N_("Cannot setup tracking information; starting point '%s' is not a branch."); | |
212 | static const char upstream_missing[] = | |
213 | N_("the requested upstream branch '%s' does not exist"); | |
214 | static const char upstream_advice[] = | |
215 | N_("\n" | |
216 | "If you are planning on basing your work on an upstream\n" | |
217 | "branch that already exists at the remote, you may need to\n" | |
218 | "run \"git fetch\" to retrieve it.\n" | |
219 | "\n" | |
220 | "If you are planning to push out a new local branch that\n" | |
221 | "will track its remote counterpart, you may want to use\n" | |
222 | "\"git push -u\" to set the upstream config as you push."); | |
223 | ||
224 | void create_branch(const char *head, | |
225 | const char *name, const char *start_name, | |
226 | int force, int reflog, int clobber_head, | |
227 | int quiet, enum branch_track track) | |
228 | { | |
229 | struct ref_lock *lock = NULL; | |
230 | struct commit *commit; | |
231 | unsigned char sha1[20]; | |
232 | char *real_ref, msg[PATH_MAX + 20]; | |
233 | struct strbuf ref = STRBUF_INIT; | |
234 | int forcing = 0; | |
235 | int dont_change_ref = 0; | |
236 | int explicit_tracking = 0; | |
237 | ||
238 | if (track == BRANCH_TRACK_EXPLICIT || track == BRANCH_TRACK_OVERRIDE) | |
239 | explicit_tracking = 1; | |
240 | ||
241 | if (validate_new_branchname(name, &ref, force, | |
242 | track == BRANCH_TRACK_OVERRIDE || | |
243 | clobber_head)) { | |
244 | if (!force) | |
245 | dont_change_ref = 1; | |
246 | else | |
247 | forcing = 1; | |
248 | } | |
249 | ||
250 | real_ref = NULL; | |
251 | if (get_sha1(start_name, sha1)) { | |
252 | if (explicit_tracking) { | |
253 | if (advice_set_upstream_failure) { | |
254 | error(_(upstream_missing), start_name); | |
255 | advise(_(upstream_advice)); | |
256 | exit(1); | |
257 | } | |
258 | die(_(upstream_missing), start_name); | |
259 | } | |
260 | die(_("Not a valid object name: '%s'."), start_name); | |
261 | } | |
262 | ||
263 | switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) { | |
264 | case 0: | |
265 | /* Not branching from any existing branch */ | |
266 | if (explicit_tracking) | |
267 | die(_(upstream_not_branch), start_name); | |
268 | break; | |
269 | case 1: | |
270 | /* Unique completion -- good, only if it is a real branch */ | |
271 | if (!starts_with(real_ref, "refs/heads/") && | |
272 | validate_remote_tracking_branch(real_ref)) { | |
273 | if (explicit_tracking) | |
274 | die(_(upstream_not_branch), start_name); | |
275 | else | |
276 | real_ref = NULL; | |
277 | } | |
278 | break; | |
279 | default: | |
280 | die(_("Ambiguous object name: '%s'."), start_name); | |
281 | break; | |
282 | } | |
283 | ||
284 | if ((commit = lookup_commit_reference(sha1)) == NULL) | |
285 | die(_("Not a valid branch point: '%s'."), start_name); | |
286 | hashcpy(sha1, commit->object.sha1); | |
287 | ||
288 | if (!dont_change_ref) { | |
289 | lock = lock_any_ref_for_update(ref.buf, NULL, 0, NULL); | |
290 | if (!lock) | |
291 | die_errno(_("Failed to lock ref for update")); | |
292 | } | |
293 | ||
294 | if (reflog) | |
295 | log_all_ref_updates = 1; | |
296 | ||
297 | if (forcing) | |
298 | snprintf(msg, sizeof msg, "branch: Reset to %s", | |
299 | start_name); | |
300 | else if (!dont_change_ref) | |
301 | snprintf(msg, sizeof msg, "branch: Created from %s", | |
302 | start_name); | |
303 | ||
304 | if (real_ref && track) | |
305 | setup_tracking(ref.buf + 11, real_ref, track, quiet); | |
306 | ||
307 | if (!dont_change_ref) | |
308 | if (write_ref_sha1(lock, sha1, msg) < 0) | |
309 | die_errno(_("Failed to write ref")); | |
310 | ||
311 | strbuf_release(&ref); | |
312 | free(real_ref); | |
313 | } | |
314 | ||
315 | void remove_branch_state(void) | |
316 | { | |
317 | unlink(git_path("CHERRY_PICK_HEAD")); | |
318 | unlink(git_path("REVERT_HEAD")); | |
319 | unlink(git_path("MERGE_HEAD")); | |
320 | unlink(git_path("MERGE_RR")); | |
321 | unlink(git_path("MERGE_MSG")); | |
322 | unlink(git_path("MERGE_MODE")); | |
323 | unlink(git_path("SQUASH_MSG")); | |
324 | } |