Code

Avoid segfault with 'git branch' when the HEAD is detached
[git.git] / builtin-branch.c
index d279702ba9a90faa020fa2f102d595cec082be21..6106a1abd5d5a001a44d06a66bc0ea2e47f5247d 100644 (file)
 #include "remote.h"
 #include "parse-options.h"
 #include "branch.h"
+#include "diff.h"
+#include "revision.h"
 
 static const char * const builtin_branch_usage[] = {
-       "git-branch [options] [-r | -a] [--merged | --no-merged]",
-       "git-branch [options] [-l] [-f] <branchname> [<start-point>]",
-       "git-branch [options] [-r] (-d | -D) <branchname>",
-       "git-branch [options] (-m | -M) [<oldbranch>] <newbranch>",
+       "git branch [options] [-r | -a] [--merged | --no-merged]",
+       "git branch [options] [-l] [-f] <branchname> [<start-point>]",
+       "git branch [options] [-r] (-d | -D) <branchname>",
+       "git branch [options] (-m | -M) [<oldbranch>] <newbranch>",
        NULL
 };
 
-#define REF_UNKNOWN_TYPE    0x00
 #define REF_LOCAL_BRANCH    0x01
 #define REF_REMOTE_BRANCH   0x02
-#define REF_TAG             0x04
 
 static const char *head;
 static unsigned char head_sha1[20];
@@ -46,7 +46,12 @@ enum color_branch {
        COLOR_BRANCH_CURRENT = 4,
 };
 
-static int mergefilter = -1;
+static enum merge_filter {
+       NO_FILTER = 0,
+       SHOW_NOT_MERGED,
+       SHOW_MERGED,
+} merge_filter;
+static unsigned char merge_filter_ref[20];
 
 static int parse_branch_color_slot(const char *var, int ofs)
 {
@@ -92,7 +97,6 @@ static int delete_branches(int argc, const char **argv, int force, int kinds)
        unsigned char sha1[20];
        char *name = NULL;
        const char *fmt, *remote;
-       char section[PATH_MAX];
        int i;
        int ret = 0;
 
@@ -155,16 +159,18 @@ static int delete_branches(int argc, const char **argv, int force, int kinds)
                        continue;
                }
 
-               if (delete_ref(name, sha1)) {
+               if (delete_ref(name, sha1, 0)) {
                        error("Error deleting %sbranch '%s'", remote,
                               argv[i]);
                        ret = 1;
                } else {
-                       printf("Deleted %sbranch %s.\n", remote, argv[i]);
-                       snprintf(section, sizeof(section), "branch.%s",
-                                argv[i]);
-                       if (git_config_rename_section(section, NULL) < 0)
+                       struct strbuf buf = STRBUF_INIT;
+                       printf("Deleted %sbranch %s (%s).\n", remote, argv[i],
+                               find_unique_abbrev(sha1, DEFAULT_ABBREV));
+                       strbuf_addf(&buf, "branch.%s", argv[i]);
+                       if (git_config_rename_section(buf.buf, NULL) < 0)
                                warning("Update of config-file failed");
+                       strbuf_release(&buf);
                }
        }
 
@@ -175,74 +181,77 @@ static int delete_branches(int argc, const char **argv, int force, int kinds)
 
 struct ref_item {
        char *name;
-       unsigned int kind;
-       unsigned char sha1[20];
+       char *dest;
+       unsigned int kind, len;
+       struct commit *commit;
 };
 
 struct ref_list {
+       struct rev_info revs;
        int index, alloc, maxwidth;
        struct ref_item *list;
        struct commit_list *with_commit;
        int kinds;
 };
 
-static int has_commit(const unsigned char *sha1, struct commit_list *with_commit)
+static char *resolve_symref(const char *src, const char *prefix)
 {
-       struct commit *commit;
-
-       if (!with_commit)
-               return 1;
-       commit = lookup_commit_reference_gently(sha1, 1);
-       if (!commit)
-               return 0;
-       while (with_commit) {
-               struct commit *other;
-
-               other = with_commit->item;
-               with_commit = with_commit->next;
-               if (in_merge_bases(other, &commit, 1))
-                       return 1;
-       }
-       return 0;
+       unsigned char sha1[20];
+       int flag;
+       const char *dst, *cp;
+
+       dst = resolve_ref(src, sha1, 0, &flag);
+       if (!(dst && (flag & REF_ISSYMREF)))
+               return NULL;
+       if (prefix && (cp = skip_prefix(dst, prefix)))
+               dst = cp;
+       return xstrdup(dst);
 }
 
 static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 {
        struct ref_list *ref_list = (struct ref_list*)(cb_data);
        struct ref_item *newitem;
-       int kind = REF_UNKNOWN_TYPE;
-       int len;
-       static struct commit_list branch;
+       struct commit *commit;
+       int kind, i;
+       const char *prefix, *orig_refname = refname;
+
+       static struct {
+               int kind;
+               const char *prefix;
+               int pfxlen;
+       } ref_kind[] = {
+               { REF_LOCAL_BRANCH, "refs/heads/", 11 },
+               { REF_REMOTE_BRANCH, "refs/remotes/", 13 },
+       };
 
        /* Detect kind */
-       if (!prefixcmp(refname, "refs/heads/")) {
-               kind = REF_LOCAL_BRANCH;
-               refname += 11;
-       } else if (!prefixcmp(refname, "refs/remotes/")) {
-               kind = REF_REMOTE_BRANCH;
-               refname += 13;
-       } else if (!prefixcmp(refname, "refs/tags/")) {
-               kind = REF_TAG;
-               refname += 10;
+       for (i = 0; i < ARRAY_SIZE(ref_kind); i++) {
+               prefix = ref_kind[i].prefix;
+               if (strncmp(refname, prefix, ref_kind[i].pfxlen))
+                       continue;
+               kind = ref_kind[i].kind;
+               refname += ref_kind[i].pfxlen;
+               break;
        }
+       if (ARRAY_SIZE(ref_kind) <= i)
+               return 0;
+
+       commit = lookup_commit_reference_gently(sha1, 1);
+       if (!commit)
+               return error("branch '%s' does not point at a commit", refname);
 
        /* Filter with with_commit if specified */
-       if (!has_commit(sha1, ref_list->with_commit))
+       if (!is_descendant_of(commit, ref_list->with_commit))
                return 0;
 
        /* Don't add types the caller doesn't want */
        if ((kind & ref_list->kinds) == 0)
                return 0;
 
-       if (mergefilter > -1) {
-               branch.item = lookup_commit_reference_gently(sha1, 1);
-               if (!branch.item)
-                       die("Unable to lookup tip of branch %s", refname);
-               if (mergefilter == 0 && has_commit(head_sha1, &branch))
-                       return 0;
-               if (mergefilter == 1 && !has_commit(head_sha1, &branch))
-                       return 0;
-       }
+       if (merge_filter != NO_FILTER)
+               add_pending_object(&ref_list->revs,
+                                  (struct object *)commit, refname);
 
        /* Resize buffer */
        if (ref_list->index >= ref_list->alloc) {
@@ -255,10 +264,15 @@ static int append_ref(const char *refname, const unsigned char *sha1, int flags,
        newitem = &(ref_list->list[ref_list->index++]);
        newitem->name = xstrdup(refname);
        newitem->kind = kind;
-       hashcpy(newitem->sha1, sha1);
-       len = strlen(newitem->name);
-       if (len > ref_list->maxwidth)
-               ref_list->maxwidth = len;
+       newitem->commit = commit;
+       newitem->len = strlen(refname);
+       newitem->dest = resolve_symref(orig_refname, prefix);
+       /* adjust for "remotes/" */
+       if (newitem->kind == REF_REMOTE_BRANCH &&
+           ref_list->kinds != REF_REMOTE_BRANCH)
+               newitem->len += 8;
+       if (newitem->len > ref_list->maxwidth)
+               ref_list->maxwidth = newitem->len;
 
        return 0;
 }
@@ -267,8 +281,10 @@ static void free_ref_list(struct ref_list *ref_list)
 {
        int i;
 
-       for (i = 0; i < ref_list->index; i++)
+       for (i = 0; i < ref_list->index; i++) {
                free(ref_list->list[i].name);
+               free(ref_list->list[i].dest);
+       }
        free(ref_list->list);
 }
 
@@ -282,12 +298,42 @@ static int ref_cmp(const void *r1, const void *r2)
        return strcmp(c1->name, c2->name);
 }
 
+static void fill_tracking_info(struct strbuf *stat, const char *branch_name)
+{
+       int ours, theirs;
+       struct branch *branch = branch_get(branch_name);
+
+       if (!stat_tracking_info(branch, &ours, &theirs) || (!ours && !theirs))
+               return;
+       if (!ours)
+               strbuf_addf(stat, "[behind %d] ", theirs);
+       else if (!theirs)
+               strbuf_addf(stat, "[ahead %d] ", ours);
+       else
+               strbuf_addf(stat, "[ahead %d, behind %d] ", ours, theirs);
+}
+
+static int matches_merge_filter(struct commit *commit)
+{
+       int is_merged;
+
+       if (merge_filter == NO_FILTER)
+               return 1;
+
+       is_merged = !!(commit->object.flags & UNINTERESTING);
+       return (is_merged == (merge_filter == SHOW_MERGED));
+}
+
 static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
-                          int abbrev, int current)
+                          int abbrev, int current, char *prefix)
 {
        char c;
        int color;
-       struct commit *commit;
+       struct commit *commit = item->commit;
+       struct strbuf out = STRBUF_INIT, name = STRBUF_INIT;
+
+       if (!matches_merge_filter(commit))
+               return;
 
        switch (item->kind) {
        case REF_LOCAL_BRANCH:
@@ -307,50 +353,92 @@ static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
                color = COLOR_BRANCH_CURRENT;
        }
 
-       if (verbose) {
-               struct strbuf subject;
-               const char *sub = " **** invalid ref ****";
+       strbuf_addf(&name, "%s%s", prefix, item->name);
+       if (verbose)
+               strbuf_addf(&out, "%c %s%-*s%s", c, branch_get_color(color),
+                           maxwidth, name.buf,
+                           branch_get_color(COLOR_BRANCH_RESET));
+       else
+               strbuf_addf(&out, "%c %s%s%s", c, branch_get_color(color),
+                           name.buf, branch_get_color(COLOR_BRANCH_RESET));
 
-               strbuf_init(&subject, 0);
+       if (item->dest)
+               strbuf_addf(&out, " -> %s", item->dest);
+       else if (verbose) {
+               struct strbuf subject = STRBUF_INIT, stat = STRBUF_INIT;
+               const char *sub = " **** invalid ref ****";
 
-               commit = lookup_commit(item->sha1);
+               commit = item->commit;
                if (commit && !parse_commit(commit)) {
                        pretty_print_commit(CMIT_FMT_ONELINE, commit,
                                            &subject, 0, NULL, NULL, 0, 0);
                        sub = subject.buf;
                }
-               printf("%c %s%-*s%s %s %s\n", c, branch_get_color(color),
-                      maxwidth, item->name,
-                      branch_get_color(COLOR_BRANCH_RESET),
-                      find_unique_abbrev(item->sha1, abbrev), sub);
+
+               if (item->kind == REF_LOCAL_BRANCH)
+                       fill_tracking_info(&stat, item->name);
+
+               strbuf_addf(&out, " %s %s%s",
+                       find_unique_abbrev(item->commit->object.sha1, abbrev),
+                       stat.buf, sub);
+               strbuf_release(&stat);
                strbuf_release(&subject);
-       } else {
-               printf("%c %s%s%s\n", c, branch_get_color(color), item->name,
-                      branch_get_color(COLOR_BRANCH_RESET));
        }
+       printf("%s\n", out.buf);
+       strbuf_release(&name);
+       strbuf_release(&out);
+}
+
+static int calc_maxwidth(struct ref_list *refs)
+{
+       int i, w = 0;
+       for (i = 0; i < refs->index; i++) {
+               if (!matches_merge_filter(refs->list[i].commit))
+                       continue;
+               if (refs->list[i].len > w)
+                       w = refs->list[i].len;
+       }
+       return w;
 }
 
 static void print_ref_list(int kinds, int detached, int verbose, int abbrev, struct commit_list *with_commit)
 {
        int i;
        struct ref_list ref_list;
+       struct commit *head_commit = lookup_commit_reference_gently(head_sha1, 1);
 
        memset(&ref_list, 0, sizeof(ref_list));
        ref_list.kinds = kinds;
        ref_list.with_commit = with_commit;
+       if (merge_filter != NO_FILTER)
+               init_revisions(&ref_list.revs, NULL);
        for_each_ref(append_ref, &ref_list);
+       if (merge_filter != NO_FILTER) {
+               struct commit *filter;
+               filter = lookup_commit_reference_gently(merge_filter_ref, 0);
+               filter->object.flags |= UNINTERESTING;
+               add_pending_object(&ref_list.revs,
+                                  (struct object *) filter, "");
+               ref_list.revs.limited = 1;
+               prepare_revision_walk(&ref_list.revs);
+               if (verbose)
+                       ref_list.maxwidth = calc_maxwidth(&ref_list);
+       }
 
        qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
 
        detached = (detached && (kinds & REF_LOCAL_BRANCH));
-       if (detached && has_commit(head_sha1, with_commit)) {
+       if (detached && head_commit &&
+           is_descendant_of(head_commit, with_commit)) {
                struct ref_item item;
                item.name = xstrdup("(no branch)");
+               item.len = strlen(item.name);
                item.kind = REF_LOCAL_BRANCH;
-               hashcpy(item.sha1, head_sha1);
+               item.dest = NULL;
+               item.commit = head_commit;
                if (strlen(item.name) > ref_list.maxwidth)
-                             ref_list.maxwidth = strlen(item.name);
-               print_ref_item(&item, ref_list.maxwidth, verbose, abbrev, 1);
+                       ref_list.maxwidth = strlen(item.name);
+               print_ref_item(&item, ref_list.maxwidth, verbose, abbrev, 1, "");
                free(item.name);
        }
 
@@ -358,8 +446,11 @@ static void print_ref_list(int kinds, int detached, int verbose, int abbrev, str
                int current = !detached &&
                        (ref_list.list[i].kind == REF_LOCAL_BRANCH) &&
                        !strcmp(ref_list.list[i].name, head);
+               char *prefix = (kinds != REF_REMOTE_BRANCH &&
+                               ref_list.list[i].kind == REF_REMOTE_BRANCH)
+                               ? "remotes/" : "";
                print_ref_item(&ref_list.list[i], ref_list.maxwidth, verbose,
-                              abbrev, current);
+                              abbrev, current, prefix);
        }
 
        free_ref_list(&ref_list);
@@ -367,57 +458,58 @@ static void print_ref_list(int kinds, int detached, int verbose, int abbrev, str
 
 static void rename_branch(const char *oldname, const char *newname, int force)
 {
-       char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
+       struct strbuf oldref = STRBUF_INIT, newref = STRBUF_INIT, logmsg = STRBUF_INIT;
        unsigned char sha1[20];
-       char oldsection[PATH_MAX], newsection[PATH_MAX];
+       struct strbuf oldsection = STRBUF_INIT, newsection = STRBUF_INIT;
 
        if (!oldname)
                die("cannot rename the current branch while not on any.");
 
-       if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
-               die("Old branchname too long");
+       strbuf_addf(&oldref, "refs/heads/%s", oldname);
 
-       if (check_ref_format(oldref))
-               die("Invalid branch name: %s", oldref);
+       if (check_ref_format(oldref.buf))
+               die("Invalid branch name: %s", oldref.buf);
 
-       if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
-               die("New branchname too long");
+       strbuf_addf(&newref, "refs/heads/%s", newname);
 
-       if (check_ref_format(newref))
-               die("Invalid branch name: %s", newref);
+       if (check_ref_format(newref.buf))
+               die("Invalid branch name: %s", newref.buf);
 
-       if (resolve_ref(newref, sha1, 1, NULL) && !force)
+       if (resolve_ref(newref.buf, sha1, 1, NULL) && !force)
                die("A branch named '%s' already exists.", newname);
 
-       snprintf(logmsg, sizeof(logmsg), "Branch: renamed %s to %s",
-                oldref, newref);
+       strbuf_addf(&logmsg, "Branch: renamed %s to %s",
+                oldref.buf, newref.buf);
 
-       if (rename_ref(oldref, newref, logmsg))
+       if (rename_ref(oldref.buf, newref.buf, logmsg.buf))
                die("Branch rename failed");
+       strbuf_release(&logmsg);
 
        /* no need to pass logmsg here as HEAD didn't really move */
-       if (!strcmp(oldname, head) && create_symref("HEAD", newref, NULL))
+       if (!strcmp(oldname, head) && create_symref("HEAD", newref.buf, NULL))
                die("Branch renamed to %s, but HEAD is not updated!", newname);
 
-       snprintf(oldsection, sizeof(oldsection), "branch.%s", oldref + 11);
-       snprintf(newsection, sizeof(newsection), "branch.%s", newref + 11);
-       if (git_config_rename_section(oldsection, newsection) < 0)
+       strbuf_addf(&oldsection, "branch.%s", oldref.buf + 11);
+       strbuf_release(&oldref);
+       strbuf_addf(&newsection, "branch.%s", newref.buf + 11);
+       strbuf_release(&newref);
+       if (git_config_rename_section(oldsection.buf, newsection.buf) < 0)
                die("Branch is renamed, but update of config-file failed");
+       strbuf_release(&oldsection);
+       strbuf_release(&newsection);
 }
 
-static int opt_parse_with_commit(const struct option *opt, const char *arg, int unset)
+static int opt_parse_merge_filter(const struct option *opt, const char *arg, int unset)
 {
-       unsigned char sha1[20];
-       struct commit *commit;
-
+       merge_filter = ((opt->long_name[0] == 'n')
+                       ? SHOW_NOT_MERGED
+                       : SHOW_MERGED);
+       if (unset)
+               merge_filter = SHOW_NOT_MERGED; /* b/c for --no-merged */
        if (!arg)
-               return -1;
-       if (get_sha1(arg, sha1))
+               arg = "HEAD";
+       if (get_sha1(arg, merge_filter_ref))
                die("malformed object name %s", arg);
-       commit = lookup_commit_reference(sha1);
-       if (!commit)
-               die("no such commit %s", arg);
-       commit_list_insert(commit, opt->value);
        return 0;
 }
 
@@ -438,13 +530,17 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                OPT_BOOLEAN( 0 , "color",  &branch_use_color, "use colored output"),
                OPT_SET_INT('r', NULL,     &kinds, "act on remote-tracking branches",
                        REF_REMOTE_BRANCH),
-               OPT_CALLBACK(0, "contains", &with_commit, "commit",
-                            "print only branches that contain the commit",
-                            opt_parse_with_commit),
+               {
+                       OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
+                       "print only branches that contain the commit",
+                       PARSE_OPT_LASTARG_DEFAULT,
+                       parse_opt_with_commit, (intptr_t)"HEAD",
+               },
                {
                        OPTION_CALLBACK, 0, "with", &with_commit, "commit",
                        "print only branches that contain the commit",
-                       PARSE_OPT_HIDDEN, opt_parse_with_commit,
+                       PARSE_OPT_HIDDEN | PARSE_OPT_LASTARG_DEFAULT,
+                       parse_opt_with_commit, (intptr_t) "HEAD",
                },
                OPT__ABBREV(&abbrev),
 
@@ -457,7 +553,18 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                OPT_BIT('M', NULL, &rename, "move/rename a branch, even if target exists", 2),
                OPT_BOOLEAN('l', NULL, &reflog, "create the branch's reflog"),
                OPT_BOOLEAN('f', NULL, &force_create, "force creation (when already exists)"),
-               OPT_SET_INT(0, "merged", &mergefilter, "list only merged branches", 1),
+               {
+                       OPTION_CALLBACK, 0, "no-merged", &merge_filter_ref,
+                       "commit", "print only not merged branches",
+                       PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
+                       opt_parse_merge_filter, (intptr_t) "HEAD",
+               },
+               {
+                       OPTION_CALLBACK, 0, "merged", &merge_filter_ref,
+                       "commit", "print only merged branches",
+                       PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
+                       opt_parse_merge_filter, (intptr_t) "HEAD",
+               },
                OPT_END(),
        };
 
@@ -467,9 +574,6 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                branch_use_color = git_use_color_default;
 
        track = git_branch_track;
-       argc = parse_options(argc, argv, options, builtin_branch_usage, 0);
-       if (!!delete + !!rename + !!force_create > 1)
-               usage_with_options(builtin_branch_usage, options);
 
        head = resolve_ref("HEAD", head_sha1, 0, NULL);
        if (!head)
@@ -482,6 +586,11 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                        die("HEAD not found below refs/heads!");
                head += 11;
        }
+       hashcpy(merge_filter_ref, head_sha1);
+
+       argc = parse_options(argc, argv, options, builtin_branch_usage, 0);
+       if (!!delete + !!rename + !!force_create > 1)
+               usage_with_options(builtin_branch_usage, options);
 
        if (delete)
                return delete_branches(argc, argv, delete > 1, kinds);