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git-commit-vandalism/git-mergetool.sh
David Aguilar ec245ba049 mergetool: Provide an empty file when needed 
Some merge tools cannot cope when $LOCAL, $BASE, or $REMOTE are missing.
$BASE can be missing when two branches independently add the same
filename.

Provide an empty file to make these tools happy.

When a delete/modify conflict occurs, $LOCAL and $REMOTE can also be
missing. We have special case code to handle such case so this change
may not affect that codepath, but try to be consistent and create an
empty file for them anyway.

Reported-by: Jason Wenger <jcwenger@gmail.com>
Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-01-23 11:50:22 -08:00

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#!/bin/sh
#
# This program resolves merge conflicts in git
#
# Copyright (c) 2006 Theodore Y. Ts'o
#
# This file is licensed under the GPL v2, or a later version
# at the discretion of Junio C Hamano.
#
USAGE='[--tool=tool] [-y|--no-prompt|--prompt] [file to merge] ...'
SUBDIRECTORY_OK=Yes
OPTIONS_SPEC=
TOOL_MODE=merge
. git-sh-setup
. git-mergetool--lib
require_work_tree
# Returns true if the mode reflects a symlink
is_symlink () {
test "$1" = 120000
}
is_submodule () {
test "$1" = 160000
}
local_present () {
test -n "$local_mode"
}
remote_present () {
test -n "$remote_mode"
}
base_present () {
test -n "$base_mode"
}
cleanup_temp_files () {
if test "$1" = --save-backup ; then
rm -rf -- "$MERGED.orig"
test -e "$BACKUP" && mv -- "$BACKUP" "$MERGED.orig"
rm -f -- "$LOCAL" "$REMOTE" "$BASE"
else
rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
fi
}
describe_file () {
mode="$1"
branch="$2"
file="$3"
printf " {%s}: " "$branch"
if test -z "$mode"; then
echo "deleted"
elif is_symlink "$mode" ; then
echo "a symbolic link -> '$(cat "$file")'"
elif is_submodule "$mode" ; then
echo "submodule commit $file"
else
if base_present; then
echo "modified file"
else
echo "created file"
fi
fi
}
resolve_symlink_merge () {
while true; do
printf "Use (l)ocal or (r)emote, or (a)bort? "
read ans || return 1
case "$ans" in
[lL]*)
git checkout-index -f --stage=2 -- "$MERGED"
git add -- "$MERGED"
cleanup_temp_files --save-backup
return 0
;;
[rR]*)
git checkout-index -f --stage=3 -- "$MERGED"
git add -- "$MERGED"
cleanup_temp_files --save-backup
return 0
;;
[aA]*)
return 1
;;
esac
done
}
resolve_deleted_merge () {
while true; do
if base_present; then
printf "Use (m)odified or (d)eleted file, or (a)bort? "
else
printf "Use (c)reated or (d)eleted file, or (a)bort? "
fi
read ans || return 1
case "$ans" in
[mMcC]*)
git add -- "$MERGED"
cleanup_temp_files --save-backup
return 0
;;
[dD]*)
git rm -- "$MERGED" > /dev/null
cleanup_temp_files
return 0
;;
[aA]*)
return 1
;;
esac
done
}
resolve_submodule_merge () {
while true; do
printf "Use (l)ocal or (r)emote, or (a)bort? "
read ans || return 1
case "$ans" in
[lL]*)
if ! local_present; then
if test -n "$(git ls-tree HEAD -- "$MERGED")"; then
# Local isn't present, but it's a subdirectory
git ls-tree --full-name -r HEAD -- "$MERGED" | git update-index --index-info || exit $?
else
test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
git update-index --force-remove "$MERGED"
cleanup_temp_files --save-backup
fi
elif is_submodule "$local_mode"; then
stage_submodule "$MERGED" "$local_sha1"
else
git checkout-index -f --stage=2 -- "$MERGED"
git add -- "$MERGED"
fi
return 0
;;
[rR]*)
if ! remote_present; then
if test -n "$(git ls-tree MERGE_HEAD -- "$MERGED")"; then
# Remote isn't present, but it's a subdirectory
git ls-tree --full-name -r MERGE_HEAD -- "$MERGED" | git update-index --index-info || exit $?
else
test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
git update-index --force-remove "$MERGED"
fi
elif is_submodule "$remote_mode"; then
! is_submodule "$local_mode" && test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
stage_submodule "$MERGED" "$remote_sha1"
else
test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
git checkout-index -f --stage=3 -- "$MERGED"
git add -- "$MERGED"
fi
cleanup_temp_files --save-backup
return 0
;;
[aA]*)
return 1
;;
esac
done
}
stage_submodule () {
path="$1"
submodule_sha1="$2"
mkdir -p "$path" || die "fatal: unable to create directory for module at $path"
# Find $path relative to work tree
work_tree_root=$(cd_to_toplevel && pwd)
work_rel_path=$(cd "$path" && GIT_WORK_TREE="${work_tree_root}" git rev-parse --show-prefix)
test -n "$work_rel_path" || die "fatal: unable to get path of module $path relative to work tree"
git update-index --add --replace --cacheinfo 160000 "$submodule_sha1" "${work_rel_path%/}" || die
}
checkout_staged_file () {
tmpfile=$(expr \
"$(git checkout-index --temp --stage="$1" "$2" 2>/dev/null)" \
: '\([^ ]*\) ')
if test $? -eq 0 -a -n "$tmpfile" ; then
mv -- "$(git rev-parse --show-cdup)$tmpfile" "$3"
else
>"$3"
fi
}
merge_file () {
MERGED="$1"
f=$(git ls-files -u -- "$MERGED")
if test -z "$f" ; then
if test ! -f "$MERGED" ; then
echo "$MERGED: file not found"
else
echo "$MERGED: file does not need merging"
fi
return 1
fi
ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
BACKUP="./$MERGED.BACKUP.$ext"
LOCAL="./$MERGED.LOCAL.$ext"
REMOTE="./$MERGED.REMOTE.$ext"
BASE="./$MERGED.BASE.$ext"
base_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}')
local_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}')
remote_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $1;}')
if is_submodule "$local_mode" || is_submodule "$remote_mode"; then
echo "Submodule merge conflict for '$MERGED':"
local_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $2;}')
remote_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $2;}')
describe_file "$local_mode" "local" "$local_sha1"
describe_file "$remote_mode" "remote" "$remote_sha1"
resolve_submodule_merge
return
fi
mv -- "$MERGED" "$BACKUP"
cp -- "$BACKUP" "$MERGED"
checkout_staged_file 1 "$MERGED" "$BASE"
checkout_staged_file 2 "$MERGED" "$LOCAL"
checkout_staged_file 3 "$MERGED" "$REMOTE"
if test -z "$local_mode" -o -z "$remote_mode"; then
echo "Deleted merge conflict for '$MERGED':"
describe_file "$local_mode" "local" "$LOCAL"
describe_file "$remote_mode" "remote" "$REMOTE"
resolve_deleted_merge
return
fi
if is_symlink "$local_mode" || is_symlink "$remote_mode"; then
echo "Symbolic link merge conflict for '$MERGED':"
describe_file "$local_mode" "local" "$LOCAL"
describe_file "$remote_mode" "remote" "$REMOTE"
resolve_symlink_merge
return
fi
echo "Normal merge conflict for '$MERGED':"
describe_file "$local_mode" "local" "$LOCAL"
describe_file "$remote_mode" "remote" "$REMOTE"
if "$prompt" = true; then
printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
read ans || return 1
fi
if base_present; then
present=true
else
present=false
fi
if ! run_merge_tool "$merge_tool" "$present"; then
echo "merge of $MERGED failed" 1>&2
mv -- "$BACKUP" "$MERGED"
if test "$merge_keep_temporaries" = "false"; then
cleanup_temp_files
fi
return 1
fi
if test "$merge_keep_backup" = "true"; then
mv -- "$BACKUP" "$MERGED.orig"
else
rm -- "$BACKUP"
fi
git add -- "$MERGED"
cleanup_temp_files
return 0
}
prompt=$(git config --bool mergetool.prompt || echo true)
while test $# != 0
do
case "$1" in
-t|--tool*)
case "$#,$1" in
*,*=*)
merge_tool=$(expr "z$1" : 'z-[^=]*=\(.*\)')
;;
1,*)
usage ;;
*)
merge_tool="$2"
shift ;;
esac
;;
-y|--no-prompt)
prompt=false
;;
--prompt)
prompt=true
;;
--)
shift
break
;;
-*)
usage
;;
*)
break
;;
esac
shift
done
prompt_after_failed_merge() {
while true; do
printf "Continue merging other unresolved paths (y/n) ? "
read ans || return 1
case "$ans" in
[yY]*)
return 0
;;
[nN]*)
return 1
;;
esac
done
}
if test -z "$merge_tool"; then
merge_tool=$(get_merge_tool "$merge_tool") || exit
fi
merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
last_status=0
rollup_status=0
files=
if test $# -eq 0 ; then
cd_to_toplevel
if test -e "$GIT_DIR/MERGE_RR"
then
files=$(git rerere remaining)
else
files=$(git ls-files -u | sed -e 's/^[^ ]* //' | sort -u)
fi
else
files=$(git ls-files -u -- "$@" | sed -e 's/^[^ ]* //' | sort -u)
fi
if test -z "$files" ; then
echo "No files need merging"
exit 0
fi
printf "Merging:\n"
printf "$files\n"
IFS='
'
for i in $files
do
if test $last_status -ne 0; then
prompt_after_failed_merge || exit 1
fi
printf "\n"
merge_file "$i"
last_status=$?
if test $last_status -ne 0; then
rollup_status=1
fi
done
exit $rollup_status
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