Andrew's git - gitweb.git/blob - git-merge-one-file-script

   1#!/bin/sh
   2#
   3# This is the git merge script, called with
   4#
   5#   $1 - original file SHA1 (or empty)
   6#   $2 - file in branch1 SHA1 (or empty)
   7#   $3 - file in branch2 SHA1 (or empty)
   8#   $4 - pathname in repository
   9#
  10#
  11# Handle some trivial cases.. The _really_ trivial cases have
  12# been handled already by read-tree, but that one doesn't
  13# do any merges that migth change the tree layout
  14#
  15
  16# if the directory is newly added in a branch, it might not exist
  17# in the current tree
  18dir=$(dirname "$4")
  19mkdir -p "$dir"
  20
  21case "${1:-.}${2:-.}${3:-.}" in
  22#
  23# deleted in both
  24#
  25"$1..")
  26        echo "ERROR: $4 is removed in both branches"
  27        echo "ERROR: This is a potential rename conflict"
  28        exit 1;;
  29#
  30# deleted in one and unchanged in the other
  31#
  32"$1.." | "$1.$1" | "$1$1.")
  33        rm -f -- "$4"
  34        echo "Removing $4"
  35        update-cache --remove -- "$4"
  36        exit 0
  37        ;;
  38
  39#
  40# added in one
  41#
  42".$2." | "..$3" )
  43        echo "Adding $4 with perm $6$7"
  44        mv $(unpack-file "$2$3") $4
  45        chmod "$6$7" $4
  46        update-cache --add -- $4
  47        exit 0
  48        ;;
  49#
  50# Added in both (check for same permissions)
  51#
  52".$2$2")
  53        if [ "$6" != "$7" ]; then
  54                echo "ERROR: File $4 added in both branches, permissions conflict $6->$7"
  55                exit 1
  56        fi
  57        echo "Adding $4 with perm $6"
  58        mv $(unpack-file "$2") $4
  59        chmod "$6" $4
  60        update-cache --add -- $4
  61        exit 0;;
  62#
  63# Modified in both, but differently ;(
  64#
  65"$1$2$3")
  66        echo "Auto-merging $4"
  67        orig=$(unpack-file $1)
  68        src1=$(unpack-file $2)
  69        src2=$(unpack-file $3)
  70        merge "$src2" "$orig" "$src1"
  71        ret=$?
  72        if [ "$6" != "$7" ]; then
  73                echo "ERROR: Permissions $5->$6->$7 don't match merging $src2"
  74                if [ $ret -ne 0 ]; then
  75                        echo "ERROR: Leaving conflict merge in $src2"
  76                fi
  77                exit 1
  78        fi
  79        chmod -- "$6" "$src2"
  80        if [ $ret -ne 0 ]; then
  81                echo "ERROR: Leaving conflict merge in $src2"
  82                exit 1
  83        fi
  84        cp -- "$src2" "$4" && chmod -- "$6" "$4" &&  update-cache --add -- "$4" && exit 0
  85        ;;
  86
  87*)
  88        echo "Not handling case $1 -> $2 -> $3"
  89        ;;
  90esac
  91exit 1