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 "WARNING: $4 is removed in both branches."
  23         echo "WARNING: This is a potential rename conflict."
  24         exec git-update-cache --remove -- "$4" ;;
  25 #
  26 # Deleted in one and unchanged in the other.
  27 #
  28 "$1.." | "$1.$1" | "$1$1.")
  29         echo "Removing $4"
  30         rm -f -- "$4"
  31         exec git-update-cache --remove -- "$4" ;;
  32 #
  33 # Added in one.
  34 #
  35 ".$2." | "..$3" )
  36         case "$6$7" in *7??) mode=+x;; *) mode=-x;; esac
  37         echo "Adding $4 with perm $mode."
  38         git-cat-file blob "$2$3" > "$4"
  39         chmod $mode -- "$4"
  40         exec git-update-cache --add -- "$4" ;;
  41 #
  42 # Added in both (check for same permissions).
  43 #
  44 ".$3$2")
  45         if [ "$6" != "$7" ]; then
  46                 echo "ERROR: File $4 added identically in both branches,"
  47                 echo "ERROR: but permissions conflict $6->$7."
  48                 exit 1
  49         fi
  50         case "$6" in *7??) mode=+x;; *) mode=-x;; esac
  51         echo "Adding $4 with perm $mode"
  52         git-cat-file blob "$2" > "$4"
  53         chmod $mode -- "$4"
  54         exec git-update-cache --add -- "$4" ;;
  55 #
  56 # Modified in both, but differently.
  57 #
  58 "$1$2$3")
  59         echo "Auto-merging $4."
  60         orig=`git-unpack-file $1`
  61         src1=`git-unpack-file $2`
  62         src2=`git-unpack-file $3`
  63         merge -p "$src1" "$orig" "$src2" > "$4"
  64         ret=$?
  65         rm -f -- "$orig" "$src1" "$src2"
  66         if [ "$6" != "$7" ]; then
  67                 echo "ERROR: Permissions $5->$6->$7 don't match."
  68                 ret=1
  69         fi
  70         if [ $ret -ne 0 ]; then
  71                 # Reset the index to the first branch, making
  72                 # git-diff-file useful
  73                 git-update-cache --add --cacheinfo "$6" "$2" "$4"
  74                 echo "ERROR: Merge conflict in $4."
  75                 exit 1
  76         fi
  77         exec git-update-cache --add -- "$4" ;;
  78 *)
  79         echo "ERROR: Not handling case $4: $1 -> $2 -> $3" ;;
  80 esac
  81 exit 1