contrib/examples/git-resolve.sh

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