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 - original file mode (or empty)
  12#   $6 - file in branch1 mode (or empty)
  13#   $7 - file in branch2 mode (or empty)
  14#
  15# Handle some trivial cases.. The _really_ trivial cases have
  16# been handled already by git read-tree, but that one doesn't
  17# do any merges that might change the tree layout.
  18
  19USAGE='<orig blob> <our blob> <their blob> <path>'
  20USAGE="$USAGE <orig mode> <our mode> <their mode>"
  21LONG_USAGE="usage: git merge-one-file $USAGE
  22
  23Blob ids and modes should be empty for missing files."
  24
  25SUBDIRECTORY_OK=Yes
  26. git-sh-setup
  27cd_to_toplevel
  28require_work_tree
  29
  30if test $# != 7
  31then
  32        echo "$LONG_USAGE"
  33        exit 1
  34fi
  35
  36case "${1:-.}${2:-.}${3:-.}" in
  37#
  38# Deleted in both or deleted in one and unchanged in the other
  39#
  40"$1.." | "$1.$1" | "$1$1.")
  41        if test -n "$2"
  42        then
  43                echo "Removing $4"
  44        else
  45                # read-tree checked that index matches HEAD already,
  46                # so we know we do not have this path tracked.
  47                # there may be an unrelated working tree file here,
  48                # which we should just leave unmolested.  Make sure
  49                # we do not have it in the index, though.
  50                exec git update-index --remove -- "$4"
  51        fi
  52        if test -f "$4"
  53        then
  54                rm -f -- "$4" &&
  55                rmdir -p "$(expr "z$4" : 'z\(.*\)/')" 2>/dev/null || :
  56        fi &&
  57                exec git update-index --remove -- "$4"
  58        ;;
  59
  60#
  61# Added in one.
  62#
  63".$2.")
  64        # the other side did not add and we added so there is nothing
  65        # to be done, except making the path merged.
  66        exec git update-index --add --cacheinfo "$6" "$2" "$4"
  67        ;;
  68"..$3")
  69        echo "Adding $4"
  70        if test -f "$4"
  71        then
  72                echo "ERROR: untracked $4 is overwritten by the merge." >&2
  73                exit 1
  74        fi
  75        git update-index --add --cacheinfo "$7" "$3" "$4" &&
  76                exec git checkout-index -u -f -- "$4"
  77        ;;
  78
  79#
  80# Added in both, identically (check for same permissions).
  81#
  82".$3$2")
  83        if test "$6" != "$7"
  84        then
  85                echo "ERROR: File $4 added identically in both branches," >&2
  86                echo "ERROR: but permissions conflict $6->$7." >&2
  87                exit 1
  88        fi
  89        echo "Adding $4"
  90        git update-index --add --cacheinfo "$6" "$2" "$4" &&
  91                exec git checkout-index -u -f -- "$4"
  92        ;;
  93
  94#
  95# Modified in both, but differently.
  96#
  97"$1$2$3" | ".$2$3")
  98
  99        case ",$6,$7," in
 100        *,120000,*)
 101                echo "ERROR: $4: Not merging symbolic link changes." >&2
 102                exit 1
 103                ;;
 104        *,160000,*)
 105                echo "ERROR: $4: Not merging conflicting submodule changes." >&2
 106                exit 1
 107                ;;
 108        esac
 109
 110        src1=$(git-unpack-file $2)
 111        src2=$(git-unpack-file $3)
 112        case "$1" in
 113        '')
 114                echo "Added $4 in both, but differently."
 115                orig=$(git-unpack-file $2)
 116                create_virtual_base "$orig" "$src2"
 117                ;;
 118        *)
 119                echo "Auto-merging $4"
 120                orig=$(git-unpack-file $1)
 121                ;;
 122        esac
 123
 124        git merge-file "$src1" "$orig" "$src2"
 125        ret=$?
 126        msg=
 127        if test $ret != 0 || test -z "$1"
 128        then
 129                msg='content conflict'
 130                ret=1
 131        fi
 132
 133        # Create the working tree file, using "our tree" version from the
 134        # index, and then store the result of the merge.
 135        git checkout-index -f --stage=2 -- "$4" && cat "$src1" >"$4" || exit 1
 136        rm -f -- "$orig" "$src1" "$src2"
 137
 138        if test "$6" != "$7"
 139        then
 140                if test -n "$msg"
 141                then
 142                        msg="$msg, "
 143                fi
 144                msg="${msg}permissions conflict: $5->$6,$7"
 145                ret=1
 146        fi
 147
 148        if test $ret != 0
 149        then
 150                echo "ERROR: $msg in $4" >&2
 151                exit 1
 152        fi
 153        exec git update-index -- "$4"
 154        ;;
 155
 156*)
 157        echo "ERROR: $4: Not handling case $1 -> $2 -> $3" >&2
 158        ;;
 159esac
 160exit 1