git-merge-one-file.sh

   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         if [ "$2" ]; then
  25                 echo "Removing $4"
  26         fi
  27         if test -f "$4"; then
  28                 rm -f -- "$4"
  29         fi &&
  30                 exec git-update-index --remove -- "$4"
  31         ;;
  32
  33 #
  34 # Added in one.
  35 #
  36 ".$2." | "..$3" )
  37         echo "Adding $4"
  38         git-update-index --add --cacheinfo "$6$7" "$2$3" "$4" &&
  39                 exec git-checkout-index -u -f -- "$4"
  40         ;;
  41
  42 #
  43 # Added in both, identically (check for same permissions).
  44 #
  45 ".$3$2")
  46         if [ "$6" != "$7" ]; then
  47                 echo "ERROR: File $4 added identically in both branches,"
  48                 echo "ERROR: but permissions conflict $6->$7."
  49                 exit 1
  50         fi
  51         echo "Adding $4"
  52         git-update-index --add --cacheinfo "$6" "$2" "$4" &&
  53                 exec git-checkout-index -u -f -- "$4"
  54         ;;
  55
  56 #
  57 # Modified in both, but differently.
  58 #
  59 "$1$2$3" | ".$2$3")
  60         src2=`git-unpack-file $3`
  61         case "$1" in
  62         '')
  63                 echo "Added $4 in both, but differently."
  64                 # This extracts OUR file in $orig, and uses git-apply to
  65                 # remove lines that are unique to ours.
  66                 orig=`git-unpack-file $2`
  67                 sz0=`wc -c <"$orig"`
  68                 diff -u -La/$orig -Lb/$orig $orig $src2 | git-apply --no-add
  69                 sz1=`wc -c <"$orig"`
  70
  71                 # If we do not have enough common material, it is not
  72                 # worth trying two-file merge using common subsections.
  73                 expr "$sz0" \< "$sz1" \* 2 >/dev/null || : >$orig
  74                 ;;
  75         *)
  76                 echo "Auto-merging $4."
  77                 orig=`git-unpack-file $1`
  78                 ;;
  79         esac
  80
  81         # We reset the index to the first branch, making
  82         # git-diff-file useful
  83         git-update-index --add --cacheinfo "$6" "$2" "$4"
  84                 git-checkout-index -u -f -- "$4" &&
  85                 merge "$4" "$orig" "$src2"
  86         ret=$?
  87         rm -f -- "$orig" "$src2"
  88
  89         if [ "$6" != "$7" ]; then
  90                 echo "ERROR: Permissions conflict: $5->$6,$7."
  91                 ret=1
  92         fi
  93         if [ "$1" = '' ]; then
  94                 ret=1
  95         fi
  96
  97         if [ $ret -ne 0 ]; then
  98                 echo "ERROR: Merge conflict in $4."
  99                 exit 1
 100         fi
 101         exec git-update-index -- "$4"
 102         ;;
 103
 104 *)
 105         echo "ERROR: $4: Not handling case $1 -> $2 -> $3"
 106         ;;
 107 esac
 108 exit 1