git-merge-one-file-script

   1 #!/bin/sh
   2 #
   3 # Copyright (c) Linus Torvalds, 2005
   4 #
   5 # This is the git per-file merge script, called with
   6 #
   7 #   $1 - original file SHA1 (or empty)
   8 #   $2 - file in branch1 SHA1 (or empty)
   9 #   $3 - file in branch2 SHA1 (or empty)
  10 #   $4 - pathname in repository
  11 #   $5 - orignal file mode (or empty)
  12 #   $6 - file in branch1 mode (or empty)
  13 #   $7 - file in branch2 mode (or empty)
  14 #
  15 # Handle some trivial cases.. The _really_ trivial cases have
  16 # been handled already by git-read-tree, but that one doesn't
  17 # do any merges that might change the tree layout.
  18
  19 case "${1:-.}${2:-.}${3:-.}" in
  20 #
  21 # Deleted in both or deleted in one and unchanged in the other
  22 #
  23 "$1.." | "$1.$1" | "$1$1.")
  24         echo "Removing $4"
  25         if test -f "$4"; then
  26                 rm -f -- "$4"
  27         fi &&
  28                 exec git-update-cache --remove -- "$4"
  29         ;;
  30
  31 #
  32 # Added in one.
  33 #
  34 ".$2." | "..$3" )
  35         echo "Adding $4"
  36         git-update-cache --add --cacheinfo "$6$7" "$2$3" "$4" &&
  37                 exec git-checkout-cache -u -f -- "$4"
  38         ;;
  39
  40 #
  41 # Added in both (check for same permissions).
  42 #
  43 ".$3$2")
  44         if [ "$6" != "$7" ]; then
  45                 echo "ERROR: File $4 added identically in both branches,"
  46                 echo "ERROR: but permissions conflict $6->$7."
  47                 exit 1
  48         fi
  49         echo "Adding $4"
  50         git-update-cache --add --cacheinfo "$6" "$2" "$4" &&
  51                 exec git-checkout-cache -u -f -- "$4"
  52         ;;
  53
  54 #
  55 # Modified in both, but differently.
  56 #
  57 "$1$2$3")
  58         echo "Auto-merging $4."
  59         orig=`git-unpack-file $1`
  60         src2=`git-unpack-file $3`
  61
  62         # We reset the index to the first branch, making
  63         # git-diff-file useful
  64         git-update-cache --add --cacheinfo "$6" "$2" "$4"
  65                 git-checkout-cache -u -f -- "$4" &&
  66                 merge "$4" "$orig" "$src2"
  67         ret=$?
  68         rm -f -- "$orig" "$src2"
  69
  70         if [ "$6" != "$7" ]; then
  71                 echo "ERROR: Permissions conflict: $5->$6,$7."
  72                 ret=1
  73         fi
  74
  75         if [ $ret -ne 0 ]; then
  76                 echo "ERROR: Merge conflict in $4."
  77                 exit 1
  78         fi
  79         exec git-update-cache -- "$4"
  80         ;;
  81
  82 *)
  83         echo "ERROR: $4: Not handling case $1 -> $2 -> $3"
  84         ;;
  85 esac
  86 exit 1