161 lines
3.7 KiB
Bash
Executable File
161 lines
3.7 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) Linus Torvalds, 2005
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#
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# This is the git per-file merge script, called with
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#
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# $1 - original file SHA1 (or empty)
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# $2 - file in branch1 SHA1 (or empty)
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# $3 - file in branch2 SHA1 (or empty)
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# $4 - pathname in repository
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# $5 - original file mode (or empty)
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# $6 - file in branch1 mode (or empty)
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# $7 - file in branch2 mode (or empty)
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#
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# Handle some trivial cases.. The _really_ trivial cases have
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# been handled already by git read-tree, but that one doesn't
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# do any merges that might change the tree layout.
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USAGE='<orig blob> <our blob> <their blob> <path>'
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USAGE="$USAGE <orig mode> <our mode> <their mode>"
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LONG_USAGE="Usage: git merge-one-file $USAGE
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Blob ids and modes should be empty for missing files."
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if ! test "$#" -eq 7
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then
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echo "$LONG_USAGE"
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exit 1
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fi
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case "${1:-.}${2:-.}${3:-.}" in
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#
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# Deleted in both or deleted in one and unchanged in the other
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#
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"$1.." | "$1.$1" | "$1$1.")
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if [ "$2" ]; then
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echo "Removing $4"
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else
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# read-tree checked that index matches HEAD already,
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# so we know we do not have this path tracked.
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# there may be an unrelated working tree file here,
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# which we should just leave unmolested. Make sure
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# we do not have it in the index, though.
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exec git update-index --remove -- "$4"
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fi
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if test -f "$4"; then
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rm -f -- "$4" &&
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rmdir -p "$(expr "z$4" : 'z\(.*\)/')" 2>/dev/null || :
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fi &&
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exec git update-index --remove -- "$4"
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;;
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#
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# Added in one.
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#
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".$2.")
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# the other side did not add and we added so there is nothing
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# to be done, except making the path merged.
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exec git update-index --add --cacheinfo "$6" "$2" "$4"
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;;
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"..$3")
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echo "Adding $4"
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if test -f "$4"
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then
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echo "ERROR: untracked $4 is overwritten by the merge."
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exit 1
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fi
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git update-index --add --cacheinfo "$7" "$3" "$4" &&
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exec git checkout-index -u -f -- "$4"
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;;
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#
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# Added in both, identically (check for same permissions).
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#
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".$3$2")
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if [ "$6" != "$7" ]; then
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echo "ERROR: File $4 added identically in both branches,"
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echo "ERROR: but permissions conflict $6->$7."
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exit 1
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fi
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echo "Adding $4"
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git update-index --add --cacheinfo "$6" "$2" "$4" &&
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exec git checkout-index -u -f -- "$4"
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;;
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#
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# Modified in both, but differently.
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#
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"$1$2$3" | ".$2$3")
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case ",$6,$7," in
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*,120000,*)
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echo "ERROR: $4: Not merging symbolic link changes."
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exit 1
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;;
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*,160000,*)
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echo "ERROR: $4: Not merging conflicting submodule changes."
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exit 1
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;;
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esac
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src2=`git-unpack-file $3`
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case "$1" in
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'')
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echo "Added $4 in both, but differently."
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# This extracts OUR file in $orig, and uses git apply to
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# remove lines that are unique to ours.
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orig=`git-unpack-file $2`
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sz0=`wc -c <"$orig"`
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diff -u -La/$orig -Lb/$orig $orig $src2 | git apply --no-add
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sz1=`wc -c <"$orig"`
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# If we do not have enough common material, it is not
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# worth trying two-file merge using common subsections.
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expr "$sz0" \< "$sz1" \* 2 >/dev/null || : >$orig
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;;
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*)
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echo "Auto-merging $4"
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orig=`git-unpack-file $1`
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;;
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esac
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# Be careful for funny filename such as "-L" in "$4", which
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# would confuse "merge" greatly.
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src1=`git-unpack-file $2`
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git merge-file "$src1" "$orig" "$src2"
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ret=$?
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msg=
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if [ $ret -ne 0 ]; then
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msg='content conflict'
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fi
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# Create the working tree file, using "our tree" version from the
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# index, and then store the result of the merge.
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git checkout-index -f --stage=2 -- "$4" && cat "$src1" >"$4"
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rm -f -- "$orig" "$src1" "$src2"
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if [ "$6" != "$7" ]; then
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if [ -n "$msg" ]; then
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msg="$msg, "
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fi
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msg="${msg}permissions conflict: $5->$6,$7"
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ret=1
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fi
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if [ "$1" = '' ]; then
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ret=1
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fi
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if [ $ret -ne 0 ]; then
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echo "ERROR: $msg in $4"
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exit 1
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fi
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exec git update-index -- "$4"
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;;
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*)
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echo "ERROR: $4: Not handling case $1 -> $2 -> $3"
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;;
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esac
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exit 1
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