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Diffstat (limited to 'git-merge-one-file.sh')
| -rwxr-xr-x | git-merge-one-file.sh | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/git-merge-one-file.sh b/git-merge-one-file.sh new file mode 100755 index 0000000000..d067894bf4 --- /dev/null +++ b/git-merge-one-file.sh @@ -0,0 +1,160 @@ +#!/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) +# $7 - file in branch2 mode (or empty) +# +# Handle some trivial cases.. The _really_ trivial cases have +# been handled already by git read-tree, but that one doesn't +# do any merges that might change the tree layout. + +USAGE='<orig blob> <our blob> <their blob> <path>' +USAGE="$USAGE <orig mode> <our mode> <their mode>" +LONG_USAGE="Usage: git merge-one-file $USAGE + +Blob ids and modes should be empty for missing files." + +if ! test "$#" -eq 7 +then + echo "$LONG_USAGE" + exit 1 +fi + +case "${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 |