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