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tag: v1.6.5.7
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executable file 149 lines (136 sloc) 3.552 kb
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#!/bin/sh
#
# Copyright (c) Linus Torvalds, 2005
#
# This is the git per-file merge script, called with
#
# $1 - original file SHA1 (or empty)
# $2 - file in branch1 SHA1 (or empty)
# $3 - file in branch2 SHA1 (or empty)
# $4 - pathname in repository
# $5 - original file mode (or empty)
# $6 - file in branch1 mode (or empty)
# $7 - file in branch2 mode (or empty)
#
# Handle some trivial cases.. The _really_ trivial cases have
# been handled already by git read-tree, but that one doesn't
# do any merges that might change the tree layout.

case "${1:-.}${2:-.}${3:-.}" in
#
# Deleted in both or deleted in one and unchanged in the other
#
"$1.." | "$1.$1" | "$1$1.")
if [ "$2" ]; then
echo "Removing $4"
else
# read-tree checked that index matches HEAD already,
# so we know we do not have this path tracked.
# there may be an unrelated working tree file here,
# which we should just leave unmolested. Make sure
# we do not have it in the index, though.
exec git update-index --remove -- "$4"
fi
if test -f "$4"; then
rm -f -- "$4" &&
rmdir -p "$(expr "z$4" : 'z\(.*\)/')" 2>/dev/null || :
fi &&
exec git update-index --remove -- "$4"
;;

#
# Added in one.
#
".$2.")
# the other side did not add and we added so there is nothing
# to be done, except making the path merged.
exec git update-index --add --cacheinfo "$6" "$2" "$4"
;;
"..$3")
echo "Adding $4"
if test -f "$4"
then
echo "ERROR: untracked $4 is overwritten by the merge."
exit 1
fi
git update-index --add --cacheinfo "$7" "$3" "$4" &&
exec git checkout-index -u -f -- "$4"
;;

#
# Added in both, identically (check for same permissions).
#
".$3$2")
if [ "$6" != "$7" ]; then
echo "ERROR: File $4 added identically in both branches,"
echo "ERROR: but permissions conflict $6->$7."
exit 1
fi
echo "Adding $4"
git update-index --add --cacheinfo "$6" "$2" "$4" &&
exec git checkout-index -u -f -- "$4"
;;

#
# Modified in both, but differently.
#
"$1$2$3" | ".$2$3")

case ",$6,$7," in
*,120000,*)
echo "ERROR: $4: Not merging symbolic link changes."
exit 1
;;
*,160000,*)
echo "ERROR: $4: Not merging conflicting submodule changes."
exit 1
;;
esac

src2=`git-unpack-file $3`
case "$1" in
'')
echo "Added $4 in both, but differently."
# This extracts OUR file in $orig, and uses git apply to
# remove lines that are unique to ours.
orig=`git-unpack-file $2`
sz0=`wc -c <"$orig"`
diff -u -La/$orig -Lb/$orig $orig $src2 | git apply --no-add
sz1=`wc -c <"$orig"`

# If we do not have enough common material, it is not
# worth trying two-file merge using common subsections.
expr "$sz0" \< "$sz1" \* 2 >/dev/null || : >$orig
;;
*)
echo "Auto-merging $4"
orig=`git-unpack-file $1`
;;
esac

# Be careful for funny filename such as "-L" in "$4", which
# would confuse "merge" greatly.
src1=`git-unpack-file $2`
git merge-file "$src1" "$orig" "$src2"
ret=$?
msg=
if [ $ret -ne 0 ]; then
msg='content conflict'
fi

# Create the working tree file, using "our tree" version from the
# index, and then store the result of the merge.
git checkout-index -f --stage=2 -- "$4" && cat "$src1" >"$4"
rm -f -- "$orig" "$src1" "$src2"

if [ "$6" != "$7" ]; then
if [ -n "$msg" ]; then
msg="$msg, "
fi
msg="${msg}permissions conflict: $5->$6,$7"
ret=1
fi
if [ "$1" = '' ]; then
ret=1
fi

if [ $ret -ne 0 ]; then
echo "ERROR: $msg in $4"
exit 1
fi
exec git update-index -- "$4"
;;

*)
echo "ERROR: $4: Not handling case $1 -> $2 -> $3"
;;
esac
exit 1
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