Merge refs/heads/master from .

diff --git a/Documentation/git.txt b/Documentation/git.txt
index 55d63d9..d133250 100644 (file)
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -16,6 +16,9 @@ DESCRIPTION
 
 This is reference information for the core git commands.
 
+Before reading this cover to cover, you may want to take a look
+at the link:tutorial.html[tutorial] document.
+
 The Discussion section below contains much useful definition and
 clarification info - read that first.  And of the commands, I suggest
 reading link:git-update-cache.html[git-update-cache] and

diff --git a/git-resolve-script b/git-resolve-script
index 50d5f83..7c0e3d8 100755 (executable)
--- a/git-resolve-script
+++ b/git-resolve-script
@@ -49,7 +49,41 @@ if [ "$common" == "$head" ]; then
        dropheads
        exit 0
 fi
-echo "Trying to merge $merge into $head"
+
+# Find an optimum merge base if there are more than one candidates.
+LF='
+'
+common=$(git-merge-base -a $head $merge)
+case "$common" in
+?*"$LF"?*)
+       echo "Trying to find the optimum merge base."
+       G=.tmp-index$$
+       best=
+       best_cnt=-1
+       for c in $common
+       do
+               rm -f $G
+               GIT_INDEX_FILE=$G git-read-tree -m $c $head $merge \
+                       2>/dev/null || continue
+               # Count the paths that are unmerged.
+               cnt=`GIT_INDEX_FILE=$G git-ls-files --unmerged | wc -l`
+               if test $best_cnt -le 0 -o $cnt -le $best_cnt
+               then
+                       best=$c
+                       best_cnt=$cnt
+                       if test "$best_cnt" -eq 0
+                       then
+                               # Cannot do any better than all trivial merge.
+                               break
+                       fi
+               fi
+       done
+       rm -f $G
+       common="$best"
+esac
+
+echo "Trying to merge $merge into $head using $common."
+git-update-cache --refresh 2>/dev/null
 git-read-tree -u -m $common $head $merge || exit 1
 result_tree=$(git-write-tree  2> /dev/null)
 if [ $? -ne 0 ]; then

diff --git a/merge-base.c b/merge-base.c
index 923256c..286bf0e 100644 (file)
--- a/merge-base.c
+++ b/merge-base.c
@@ -82,13 +82,17 @@ static struct commit *interesting(struct commit_list *list)
  * commit B.
  */
 
-static struct commit *common_ancestor(struct commit *rev1, struct commit *rev2)
+static int show_all = 0;
+
+static int merge_base(struct commit *rev1, struct commit *rev2)
 {
        struct commit_list *list = NULL;
        struct commit_list *result = NULL;
 
-       if (rev1 == rev2)
-               return rev1;
+       if (rev1 == rev2) {
+               printf("%s\n", sha1_to_hex(rev1->object.sha1));
+               return 0;
+       }
 
        parse_commit(rev1);
        parse_commit(rev2);
@@ -108,7 +112,7 @@ static struct commit *common_ancestor(struct commit *rev1, struct commit *rev2)
                if (flags == 3) {
                        insert_by_date(commit, &result);
 
-                       /* Mark children of a found merge uninteresting */
+                       /* Mark parents of a found merge uninteresting */
                        flags |= UNINTERESTING;
                }
                parents = commit->parents;
@@ -122,26 +126,46 @@ static struct commit *common_ancestor(struct commit *rev1, struct commit *rev2)
                        insert_by_date(p, &list);
                }
        }
-       return interesting(result);
+
+       if (!result)
+               return 1;
+
+       while (result) {
+               struct commit *commit = result->item;
+               result = result->next;
+               if (commit->object.flags & UNINTERESTING)
+                       continue;
+               printf("%s\n", sha1_to_hex(commit->object.sha1));
+               if (!show_all)
+                       return 0;
+               commit->object.flags |= UNINTERESTING;
+       }
+       return 0;
 }
 
+static const char merge_base_usage[] =
+"git-merge-base [--all] <commit-id> <commit-id>";
+
 int main(int argc, char **argv)
 {
-       struct commit *rev1, *rev2, *ret;
+       struct commit *rev1, *rev2;
        unsigned char rev1key[20], rev2key[20];
 
+       while (1 < argc && argv[1][0] == '-') {
+               char *arg = argv[1];
+               if (!strcmp(arg, "-a") || !strcmp(arg, "--all"))
+                       show_all = 1;
+               else
+                       usage(merge_base_usage);
+               argc--; argv++;
+       }
        if (argc != 3 ||
            get_sha1(argv[1], rev1key) ||
-           get_sha1(argv[2], rev2key)) {
-               usage("git-merge-base <commit-id> <commit-id>");
-       }
+           get_sha1(argv[2], rev2key))
+               usage(merge_base_usage);
        rev1 = lookup_commit_reference(rev1key);
        rev2 = lookup_commit_reference(rev2key);
        if (!rev1 || !rev2)
                return 1;
-       ret = common_ancestor(rev1, rev2);
-       if (!ret)
-               return 1;
-       printf("%s\n", sha1_to_hex(ret->object.sha1));
-       return 0;
+       return merge_base(rev1, rev2);
 }