Merge branch 'sg/completion-config'
[gitweb.git] / builtin / merge.c
index 3b0f8f96d4168463139d15f1cde655facc73426c..f89f60e11a523d45a81c3bd3a92fa9b4c5021673 100644 (file)
@@ -492,8 +492,7 @@ static void merge_name(const char *remote, struct strbuf *msg)
        }
        if (len) {
                struct strbuf truname = STRBUF_INIT;
-               strbuf_addstr(&truname, "refs/heads/");
-               strbuf_addstr(&truname, remote);
+               strbuf_addf(&truname, "refs/heads/%s", remote);
                strbuf_setlen(&truname, truname.len - len);
                if (ref_exists(truname.buf)) {
                        strbuf_addf(msg,
@@ -504,28 +503,7 @@ static void merge_name(const char *remote, struct strbuf *msg)
                        strbuf_release(&truname);
                        goto cleanup;
                }
-       }
-
-       if (!strcmp(remote, "FETCH_HEAD") &&
-                       !access(git_path("FETCH_HEAD"), R_OK)) {
-               const char *filename;
-               FILE *fp;
-               struct strbuf line = STRBUF_INIT;
-               char *ptr;
-
-               filename = git_path("FETCH_HEAD");
-               fp = fopen(filename, "r");
-               if (!fp)
-                       die_errno(_("could not open '%s' for reading"),
-                                 filename);
-               strbuf_getline(&line, fp, '\n');
-               fclose(fp);
-               ptr = strstr(line.buf, "\tnot-for-merge\t");
-               if (ptr)
-                       strbuf_remove(&line, ptr-line.buf+1, 13);
-               strbuf_addbuf(msg, &line);
-               strbuf_release(&line);
-               goto cleanup;
+               strbuf_release(&truname);
        }
 
        if (remote_head->util) {
@@ -1037,28 +1015,24 @@ static int default_edit_option(void)
                st_stdin.st_mode == st_stdout.st_mode);
 }
 
-static struct commit_list *collect_parents(struct commit *head_commit,
-                                          int *head_subsumed,
-                                          int argc, const char **argv)
+static struct commit_list *reduce_parents(struct commit *head_commit,
+                                         int *head_subsumed,
+                                         struct commit_list *remoteheads)
 {
-       int i;
-       struct commit_list *remoteheads = NULL, *parents, *next;
-       struct commit_list **remotes = &remoteheads;
+       struct commit_list *parents, *next, **remotes = &remoteheads;
 
-       if (head_commit)
-               remotes = &commit_list_insert(head_commit, remotes)->next;
-       for (i = 0; i < argc; i++) {
-               struct commit *commit = get_merge_parent(argv[i]);
-               if (!commit)
-                       help_unknown_ref(argv[i], "merge",
-                                        "not something we can merge");
-               remotes = &commit_list_insert(commit, remotes)->next;
-       }
-       *remotes = NULL;
+       /*
+        * Is the current HEAD reachable from another commit being
+        * merged?  If so we do not want to record it as a parent of
+        * the resulting merge, unless --no-ff is given.  We will flip
+        * this variable to 0 when we find HEAD among the independent
+        * tips being merged.
+        */
+       *head_subsumed = 1;
 
+       /* Find what parents to record by checking independent ones. */
        parents = reduce_heads(remoteheads);
 
-       *head_subsumed = 1; /* we will flip this to 0 when we find it */
        for (remoteheads = NULL, remotes = &remoteheads;
             parents;
             parents = next) {
@@ -1068,7 +1042,119 @@ static struct commit_list *collect_parents(struct commit *head_commit,
                        *head_subsumed = 0;
                else
                        remotes = &commit_list_insert(commit, remotes)->next;
+               free(parents);
+       }
+       return remoteheads;
+}
+
+static void prepare_merge_message(struct strbuf *merge_names, struct strbuf *merge_msg)
+{
+       struct fmt_merge_msg_opts opts;
+
+       memset(&opts, 0, sizeof(opts));
+       opts.add_title = !have_message;
+       opts.shortlog_len = shortlog_len;
+       opts.credit_people = (0 < option_edit);
+
+       fmt_merge_msg(merge_names, merge_msg, &opts);
+       if (merge_msg->len)
+               strbuf_setlen(merge_msg, merge_msg->len - 1);
+}
+
+static void handle_fetch_head(struct commit_list **remotes, struct strbuf *merge_names)
+{
+       const char *filename;
+       int fd, pos, npos;
+       struct strbuf fetch_head_file = STRBUF_INIT;
+
+       if (!merge_names)
+               merge_names = &fetch_head_file;
+
+       filename = git_path("FETCH_HEAD");
+       fd = open(filename, O_RDONLY);
+       if (fd < 0)
+               die_errno(_("could not open '%s' for reading"), filename);
+
+       if (strbuf_read(merge_names, fd, 0) < 0)
+               die_errno(_("could not read '%s'"), filename);
+       if (close(fd) < 0)
+               die_errno(_("could not close '%s'"), filename);
+
+       for (pos = 0; pos < merge_names->len; pos = npos) {
+               unsigned char sha1[20];
+               char *ptr;
+               struct commit *commit;
+
+               ptr = strchr(merge_names->buf + pos, '\n');
+               if (ptr)
+                       npos = ptr - merge_names->buf + 1;
+               else
+                       npos = merge_names->len;
+
+               if (npos - pos < 40 + 2 ||
+                   get_sha1_hex(merge_names->buf + pos, sha1))
+                       commit = NULL; /* bad */
+               else if (memcmp(merge_names->buf + pos + 40, "\t\t", 2))
+                       continue; /* not-for-merge */
+               else {
+                       char saved = merge_names->buf[pos + 40];
+                       merge_names->buf[pos + 40] = '\0';
+                       commit = get_merge_parent(merge_names->buf + pos);
+                       merge_names->buf[pos + 40] = saved;
+               }
+               if (!commit) {
+                       if (ptr)
+                               *ptr = '\0';
+                       die("not something we can merge in %s: %s",
+                           filename, merge_names->buf + pos);
+               }
+               remotes = &commit_list_insert(commit, remotes)->next;
+       }
+
+       if (merge_names == &fetch_head_file)
+               strbuf_release(&fetch_head_file);
+}
+
+static struct commit_list *collect_parents(struct commit *head_commit,
+                                          int *head_subsumed,
+                                          int argc, const char **argv,
+                                          struct strbuf *merge_msg)
+{
+       int i;
+       struct commit_list *remoteheads = NULL;
+       struct commit_list **remotes = &remoteheads;
+       struct strbuf merge_names = STRBUF_INIT, *autogen = NULL;
+
+       if (merge_msg && (!have_message || shortlog_len))
+               autogen = &merge_names;
+
+       if (head_commit)
+               remotes = &commit_list_insert(head_commit, remotes)->next;
+
+       if (argc == 1 && !strcmp(argv[0], "FETCH_HEAD")) {
+               handle_fetch_head(remotes, autogen);
+               remoteheads = reduce_parents(head_commit, head_subsumed, remoteheads);
+       } else {
+               for (i = 0; i < argc; i++) {
+                       struct commit *commit = get_merge_parent(argv[i]);
+                       if (!commit)
+                               help_unknown_ref(argv[i], "merge",
+                                                "not something we can merge");
+                       remotes = &commit_list_insert(commit, remotes)->next;
+               }
+               remoteheads = reduce_parents(head_commit, head_subsumed, remoteheads);
+               if (autogen) {
+                       struct commit_list *p;
+                       for (p = remoteheads; p; p = p->next)
+                               merge_name(merge_remote_util(p->item)->name, autogen);
+               }
        }
+
+       if (autogen) {
+               prepare_merge_message(autogen, merge_msg);
+               strbuf_release(autogen);
+       }
+
        return remoteheads;
 }
 
@@ -1158,61 +1244,62 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
                option_commit = 0;
        }
 
-       if (!abort_current_merge) {
-               if (!argc) {
-                       if (default_to_upstream)
-                               argc = setup_with_upstream(&argv);
-                       else
-                               die(_("No commit specified and merge.defaultToUpstream not set."));
-               } else if (argc == 1 && !strcmp(argv[0], "-"))
-                       argv[0] = "@{-1}";
+       if (!argc) {
+               if (default_to_upstream)
+                       argc = setup_with_upstream(&argv);
+               else
+                       die(_("No commit specified and merge.defaultToUpstream not set."));
+       } else if (argc == 1 && !strcmp(argv[0], "-")) {
+               argv[0] = "@{-1}";
        }
+
        if (!argc)
                usage_with_options(builtin_merge_usage,
                        builtin_merge_options);
 
-       /*
-        * This could be traditional "merge <msg> HEAD <commit>..."  and
-        * the way we can tell it is to see if the second token is HEAD,
-        * but some people might have misused the interface and used a
-        * commit-ish that is the same as HEAD there instead.
-        * Traditional format never would have "-m" so it is an
-        * additional safety measure to check for it.
-        */
-
-       if (!have_message && head_commit &&
-           is_old_style_invocation(argc, argv, head_commit->object.sha1)) {
-               strbuf_addstr(&merge_msg, argv[0]);
-               head_arg = argv[1];
-               argv += 2;
-               argc -= 2;
-               remoteheads = collect_parents(head_commit, &head_subsumed, argc, argv);
-       } else if (!head_commit) {
+       if (!head_commit) {
                struct commit *remote_head;
                /*
                 * If the merged head is a valid one there is no reason
                 * to forbid "git merge" into a branch yet to be born.
                 * We do the same for "git pull".
                 */
-               if (argc != 1)
-                       die(_("Can merge only exactly one commit into "
-                               "empty head"));
                if (squash)
                        die(_("Squash commit into empty head not supported yet"));
                if (fast_forward == FF_NO)
                        die(_("Non-fast-forward commit does not make sense into "
                            "an empty head"));
-               remoteheads = collect_parents(head_commit, &head_subsumed, argc, argv);
+               remoteheads = collect_parents(head_commit, &head_subsumed,
+                                             argc, argv, NULL);
                remote_head = remoteheads->item;
                if (!remote_head)
                        die(_("%s - not something we can merge"), argv[0]);
+               if (remoteheads->next)
+                       die(_("Can merge only exactly one commit into empty head"));
                read_empty(remote_head->object.sha1, 0);
                update_ref("initial pull", "HEAD", remote_head->object.sha1,
                           NULL, 0, UPDATE_REFS_DIE_ON_ERR);
                goto done;
-       } else {
-               struct strbuf merge_names = STRBUF_INIT;
+       }
 
+       /*
+        * This could be traditional "merge <msg> HEAD <commit>..."  and
+        * the way we can tell it is to see if the second token is HEAD,
+        * but some people might have misused the interface and used a
+        * commit-ish that is the same as HEAD there instead.
+        * Traditional format never would have "-m" so it is an
+        * additional safety measure to check for it.
+        */
+       if (!have_message &&
+           is_old_style_invocation(argc, argv, head_commit->object.sha1)) {
+               warning("old-style 'git merge <msg> HEAD <commit>' is deprecated.");
+               strbuf_addstr(&merge_msg, argv[0]);
+               head_arg = argv[1];
+               argv += 2;
+               argc -= 2;
+               remoteheads = collect_parents(head_commit, &head_subsumed,
+                                             argc, argv, NULL);
+       } else {
                /* We are invoked directly as the first-class UI. */
                head_arg = "HEAD";
 
@@ -1221,21 +1308,8 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
                 * the standard merge summary message to be appended
                 * to the given message.
                 */
-               remoteheads = collect_parents(head_commit, &head_subsumed, argc, argv);
-               for (p = remoteheads; p; p = p->next)
-                       merge_name(merge_remote_util(p->item)->name, &merge_names);
-
-               if (!have_message || shortlog_len) {
-                       struct fmt_merge_msg_opts opts;
-                       memset(&opts, 0, sizeof(opts));
-                       opts.add_title = !have_message;
-                       opts.shortlog_len = shortlog_len;
-                       opts.credit_people = (0 < option_edit);
-
-                       fmt_merge_msg(&merge_names, &merge_msg, &opts);
-                       if (merge_msg.len)
-                               strbuf_setlen(&merge_msg, merge_msg.len - 1);
-               }
+               remoteheads = collect_parents(head_commit, &head_subsumed,
+                                             argc, argv, &merge_msg);
        }
 
        if (!head_commit || !argc)