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 #   $5 - orignal file mode (or empty)
  10 #   $6 - file in branch1 mode (or empty)
  11 #   $7 - file in branch2 mode (or empty)
  12 #
  13 # Handle some trivial cases.. The _really_ trivial cases have
  14 # been handled already by git-read-tree, but that one doesn't
  15 # do any merges that migth change the tree layout.
  16
  17 case "${1:-.}${2:-.}${3:-.}" in
  18 #
  19 # Deleted in both.
  20 #
  21 "$1..")
  22         echo "ERROR: $4 is removed in both branches."
  23         echo "ERROR: This is a potential rename conflict."
  24         exit 1;;
  25 #
  26 # Deleted in one and unchanged in the other.
  27 #
  28 "$1.." | "$1.$1" | "$1$1.")
  29         echo "Removing $4"
  30         exec git-update-cache --force-remove "$4" ;;
  31 #
  32 # Added in one.
  33 #
  34 ".$2." | "..$3" )
  35         case "$6$7" in *7??) mode=+x;; *) mode=-x;; esac
  36         echo "Adding $4 with perm $mode."
  37         exec git-update-cache --add --cacheinfo "$6$7" "$2$3" "$4" ;;
  38 #
  39 # Added in both (check for same permissions).
  40 #
  41 ".$3$2")
  42         if [ "$6" != "$7" ]; then
  43                 echo "ERROR: File $4 added identically in both branches,"
  44                 echo "ERROR: but permissions conflict $6->$7."
  45                 exit 1
  46         fi
  47         case "$6" in *7??) mode=+x;; *) mode=-x;; esac
  48         echo "Adding $4 with perm $mode"
  49         exec git-update-cache --add --cacheinfo "$6" "$2" "$4" ;;
  50 #
  51 # Modified in both, but differently.
  52 #
  53 "$1$2$3")
  54         echo "Auto-merging $4."
  55         orig=$(git-unpack-file $1)
  56         src1=$(git-unpack-file $2)
  57         src2=$(git-unpack-file $3)
  58         merge "$src2" "$orig" "$src1"
  59         ret=$?
  60         if [ "$6" != "$7" ]; then
  61                 echo "ERROR: Permissions $5->$6->$7 don't match."
  62         fi
  63         if [ $ret -ne 0 ]; then
  64                 echo "ERROR: Leaving conflict merge in $src2."
  65                 exit 1
  66         fi
  67         sha1=$(git-write-blob "$src2") || {
  68                 echo "ERROR: Leaving conflict merge in $src2."
  69         }
  70         exec git-update-cache --add --cacheinfo "$6" $sha1 "$4" ;;
  71 *)
  72         echo "ERROR: Not handling case $4: $1 -> $2 -> $3" ;;
  73 esac
  74 exit 1