Andrew's git - gitweb.git/blob

   1#!/bin/sh
   2#
   3# Copyright (c) 2005 Junio C Hamano
   4#
   5# Resolve two or more trees recorded in $GIT_DIR/FETCH_HEAD.
   6#
   7. git-sh-setup
   8
   9usage () {
  10    die "usage: git octopus"
  11}
  12
  13# Sanity check the heads early.
  14while read SHA1 REPO
  15do
  16        test $(git-cat-file -t $SHA1) = "commit" ||
  17                die "$REPO given to octopus is not a commit"
  18done <"$GIT_DIR/FETCH_HEAD"
  19
  20head=$(git-rev-parse --verify HEAD) || exit
  21
  22git-update-index --refresh ||
  23        die "Your working tree is dirty."
  24test "$(git-diff-index --cached "$head")" = "" ||
  25        die "Your working tree does not match HEAD."
  26
  27# MRC is the current "merge reference commit"
  28# MRT is the current "merge result tree"
  29
  30MRC=$head PARENT="-p $head"
  31MRT=$(git-write-tree)
  32CNT=1 ;# counting our head
  33NON_FF_MERGE=0
  34while read SHA1 REPO
  35do
  36        common=$(git-merge-base $MRC $SHA1) ||
  37                die "Unable to find common commit with $SHA1 from $REPO"
  38
  39        if test "$common" = $SHA1
  40        then
  41                echo "Already up-to-date: $REPO"
  42                continue
  43        fi
  44
  45        CNT=`expr $CNT + 1`
  46        PARENT="$PARENT -p $SHA1"
  47
  48        if test "$common,$NON_FF_MERGE" = "$MRC,0"
  49        then
  50                # The first head being merged was a fast-forward.
  51                # Advance MRC to the head being merged, and use that
  52                # tree as the intermediate result of the merge.
  53                # We still need to count this as part of the parent set.
  54
  55                echo "Fast forwarding to: $REPO"
  56                git-read-tree -u -m $head $SHA1 || exit
  57                MRC=$SHA1 MRT=$(git-write-tree)
  58                continue
  59        fi
  60
  61        NON_FF_MERGE=1
  62
  63        echo "Trying simple merge with $REPO"
  64        git-read-tree -u -m $common $MRT $SHA1 || exit
  65        next=$(git-write-tree 2>/dev/null)
  66        if test $? -ne 0
  67        then
  68                echo "Simple merge did not work, trying automatic merge."
  69                git-merge-index -o git-merge-one-file -a || {
  70                git-read-tree --reset "$head"
  71                git-checkout-index -f -q -u -a
  72                die "Automatic merge failed; should not be doing Octopus"
  73                }
  74                next=$(git-write-tree 2>/dev/null)
  75        fi
  76        MRC=$common
  77        MRT=$next
  78done <"$GIT_DIR/FETCH_HEAD"
  79
  80# Just to be careful in case the user feeds nonsense to us.
  81case "$CNT" in
  821)
  83        echo "No changes."
  84        exit 0 ;;
  85esac
  86result_commit=$(git-fmt-merge-msg <"$GIT_DIR/FETCH_HEAD" |
  87                git-commit-tree $MRT $PARENT)
  88echo "Committed merge $result_commit"
  89git-update-ref HEAD $result_commit $head
  90git-diff-tree -p $head $result_commit | git-apply --stat