Andrew's git - gitweb.git/blob - 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#   $7 - file in branch2 mode (or empty)
  14#
  15# Handle some trivial cases.. The _really_ trivial cases have
  16# been handled already by git-read-tree, but that one doesn't
  17# do any merges that might change the tree layout.
  18
  19case "${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 -- "$4" &&
  29                rmdir -p "$(expr "$4" : '\(.*\)/')" 2>/dev/null || :
  30        fi &&
  31                exec git-update-index --remove -- "$4"
  32        ;;
  33
  34#
  35# Added in one.
  36#
  37".$2." | "..$3" )
  38        echo "Adding $4"
  39        git-update-index --add --cacheinfo "$6$7" "$2$3" "$4" &&
  40                exec git-checkout-index -u -f -- "$4"
  41        ;;
  42
  43#
  44# Added in both, identically (check for same permissions).
  45#
  46".$3$2")
  47        if [ "$6" != "$7" ]; then
  48                echo "ERROR: File $4 added identically in both branches,"
  49                echo "ERROR: but permissions conflict $6->$7."
  50                exit 1
  51        fi
  52        echo "Adding $4"
  53        git-update-index --add --cacheinfo "$6" "$2" "$4" &&
  54                exec git-checkout-index -u -f -- "$4"
  55        ;;
  56
  57#
  58# Modified in both, but differently.
  59#
  60"$1$2$3" | ".$2$3")
  61
  62        case ",$6,$7," in
  63        *,120000,*)
  64                echo "ERROR: $4: Not merging symbolic link changes."
  65                exit 1
  66                ;;
  67        esac
  68
  69        src2=`git-unpack-file $3`
  70        case "$1" in
  71        '')
  72                echo "Added $4 in both, but differently."
  73                # This extracts OUR file in $orig, and uses git-apply to
  74                # remove lines that are unique to ours.
  75                orig=`git-unpack-file $2`
  76                sz0=`wc -c <"$orig"`
  77                diff -u -La/$orig -Lb/$orig $orig $src2 | git-apply --no-add 
  78                sz1=`wc -c <"$orig"`
  79
  80                # If we do not have enough common material, it is not
  81                # worth trying two-file merge using common subsections.
  82                expr "$sz0" \< "$sz1" \* 2 >/dev/null || : >$orig
  83                ;;
  84        *)
  85                echo "Auto-merging $4"
  86                orig=`git-unpack-file $1`
  87                ;;
  88        esac
  89
  90        # Be careful for funny filename such as "-L" in "$4", which
  91        # would confuse "merge" greatly.
  92        src1=`git-unpack-file $2`
  93        merge "$src1" "$orig" "$src2"
  94        ret=$?
  95
  96        # Create the working tree file, using "our tree" version from the
  97        # index, and then store the result of the merge.
  98        git-checkout-index -f --stage=2 -- "$4" && cat "$src1" >"$4"
  99        rm -f -- "$orig" "$src1" "$src2"
 100
 101        if [ "$6" != "$7" ]; then
 102                echo "ERROR: Permissions conflict: $5->$6,$7."
 103                ret=1
 104        fi
 105        if [ "$1" = '' ]; then
 106                ret=1
 107        fi
 108
 109        if [ $ret -ne 0 ]; then
 110                echo "ERROR: Merge conflict in $4"
 111                exit 1
 112        fi
 113        exec git-update-index -- "$4"
 114        ;;
 115
 116*)
 117        echo "ERROR: $4: Not handling case $1 -> $2 -> $3"
 118        ;;
 119esac
 120exit 1