git-resolve.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Linus Torvalds
   4 #
   5 # Resolve two trees.
   6 #
   7
   8 USAGE='<head> <remote> <merge-message>'
   9 . git-sh-setup
  10
  11 dropheads() {
  12         rm -f -- "$GIT_DIR/MERGE_HEAD" \
  13                 "$GIT_DIR/LAST_MERGE" || exit 1
  14 }
  15
  16 head=$(git-rev-parse --verify "$1"^0) &&
  17 merge=$(git-rev-parse --verify "$2"^0) &&
  18 merge_msg="$3" || usage
  19
  20 #
  21 # The remote name is just used for the message,
  22 # but we do want it.
  23 #
  24 if [ -z "$head" -o -z "$merge" -o -z "$merge_msg" ]; then
  25         usage
  26 fi
  27
  28 dropheads
  29 echo $head > "$GIT_DIR"/ORIG_HEAD
  30 echo $merge > "$GIT_DIR"/LAST_MERGE
  31
  32 common=$(git-merge-base $head $merge)
  33 if [ -z "$common" ]; then
  34         die "Unable to find common commit between" $merge $head
  35 fi
  36
  37 case "$common" in
  38 "$merge")
  39         echo "Already up-to-date. Yeeah!"
  40         dropheads
  41         exit 0
  42         ;;
  43 "$head")
  44         echo "Updating from $head to $merge"
  45         git-read-tree -u -m $head $merge || exit 1
  46         git-update-ref HEAD "$merge" "$head"
  47         git-diff-tree -p $head $merge | git-apply --stat
  48         dropheads
  49         exit 0
  50         ;;
  51 esac
  52
  53 # We are going to make a new commit.
  54 git var GIT_COMMITTER_IDENT >/dev/null || exit
  55
  56 # Find an optimum merge base if there are more than one candidates.
  57 LF='
  58 '
  59 common=$(git-merge-base -a $head $merge)
  60 case "$common" in
  61 ?*"$LF"?*)
  62         echo "Trying to find the optimum merge base."
  63         G=.tmp-index$$
  64         best=
  65         best_cnt=-1
  66         for c in $common
  67         do
  68                 rm -f $G
  69                 GIT_INDEX_FILE=$G git-read-tree -m $c $head $merge \
  70                         2>/dev/null || continue
  71                 # Count the paths that are unmerged.
  72                 cnt=`GIT_INDEX_FILE=$G git-ls-files --unmerged | wc -l`
  73                 if test $best_cnt -le 0 -o $cnt -le $best_cnt
  74                 then
  75                         best=$c
  76                         best_cnt=$cnt
  77                         if test "$best_cnt" -eq 0
  78                         then
  79                                 # Cannot do any better than all trivial merge.
  80                                 break
  81                         fi
  82                 fi
  83         done
  84         rm -f $G
  85         common="$best"
  86 esac
  87
  88 echo "Trying to merge $merge into $head using $common."
  89 git-update-index --refresh 2>/dev/null
  90 git-read-tree -u -m $common $head $merge || exit 1
  91 result_tree=$(git-write-tree  2> /dev/null)
  92 if [ $? -ne 0 ]; then
  93         echo "Simple merge failed, trying Automatic merge"
  94         git-merge-index -o git-merge-one-file -a
  95         if [ $? -ne 0 ]; then
  96                 echo $merge > "$GIT_DIR"/MERGE_HEAD
  97                 die "Automatic merge failed, fix up by hand"
  98         fi
  99         result_tree=$(git-write-tree) || exit 1
 100 fi
 101 result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree -p $head -p $merge)
 102 echo "Committed merge $result_commit"
 103 git-update-ref HEAD "$result_commit" "$head"
 104 git-diff-tree -p $head $result_commit | git-apply --stat
 105 dropheads