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git/git-mergetool.sh
Johannes Sixt 7e6d6f7610 mergetool: use shell variable magic instead of `awk` 
git-mergetool spawns an enormous amount of processes. For this reason,
the test script, t7610, is exceptionally slow, in particular, on
Windows. Most of the processes are invocations of git. There are
also some that can be replaced with shell builtins. Avoid repeated
calls of `git ls-files` and `awk`.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-06-12 13:20:56 -07:00

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#!/bin/sh
#
# This program resolves merge conflicts in git
#
# Copyright (c) 2006 Theodore Y. Ts'o
# Copyright (c) 2009-2016 David Aguilar
#
# This file is licensed under the GPL v2, or a later version
# at the discretion of Junio C Hamano.
#
USAGE='[--tool=tool] [--tool-help] [-y|--no-prompt|--prompt] [-g|--gui|--no-gui] [-O<orderfile>] [file to merge] ...'
SUBDIRECTORY_OK=Yes
NONGIT_OK=Yes
OPTIONS_SPEC=
TOOL_MODE=merge
. git-sh-setup
. git-mergetool--lib
# 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"
}
mergetool_tmpdir_init () {
if test "$(git config --bool mergetool.writeToTemp)" != true
then
MERGETOOL_TMPDIR=.
return 0
fi
if MERGETOOL_TMPDIR=$(mktemp -d -t "git-mergetool-XXXXXX" 2>/dev/null)
then
return 0
fi
die "error: mktemp is needed when 'mergetool.writeToTemp' is true"
}
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
if test "$MERGETOOL_TMPDIR" != "."
then
rmdir "$MERGETOOL_TMPDIR"
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 $file"
elif base_present
then
echo "modified file"
else
echo "created file"
fi
}
resolve_symlink_merge () {
while true
do
printf "Use (l)ocal or (r)emote, or (a)bort? "
read ans || return 1
case "$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"
if test "$merge_keep_backup" = "true"
then
cleanup_temp_files --save-backup
else
cleanup_temp_files
fi
return 0
;;
[dD]*)
git rm -- "$MERGED" > /dev/null
cleanup_temp_files
return 0
;;
[aA]*)
if test "$merge_keep_temporaries" = "false"
then
cleanup_temp_files
fi
return 1
;;
esac
done
}
resolve_submodule_merge () {
while true
do
printf "Use (l)ocal or (r)emote, or (a)bort? "
read ans || return 1
case "$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" "${work_rel_path%/}" || die
}
checkout_staged_file () {
tmpfile="$(git checkout-index --temp --stage="$1" "$2" 2>/dev/null)" &&
tmpfile=${tmpfile%%' '*}
if test $? -eq 0 && test -n "$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 "$MERGED: file does not need merging"
fi
return 1
fi
# extract file extension from the last path component
case "${MERGED##*/}" in
*.*)
ext=.${MERGED##*.}
BASE=${MERGED%"$ext"}
;;
*)
BASE=$MERGED
ext=
esac
mergetool_tmpdir_init
if test "$MERGETOOL_TMPDIR" != "."
then
# If we're using a temporary directory then write to the
# top-level of that directory.
BASE=${BASE##*/}
fi
BACKUP="$MERGETOOL_TMPDIR/${BASE}_BACKUP_$$$ext"
LOCAL="$MERGETOOL_TMPDIR/${BASE}_LOCAL_$$$ext"
REMOTE="$MERGETOOL_TMPDIR/${BASE}_REMOTE_$$$ext"
BASE="$MERGETOOL_TMPDIR/${BASE}_BASE_$$$ext"
base_mode= local_mode= remote_mode=
# here, $IFS is just a LF
for line in $f
do
mode=${line%% *} # 1st word
sha1=${line#"$mode "}
sha1=${sha1%% *} # 2nd word
case "${line#$mode $sha1 }" in # remainder
'1 '*)
base_mode=$mode
;;
'2 '*)
local_mode=$mode local_sha1=$sha1
;;
'3 '*)
remote_mode=$mode remote_sha1=$sha1
;;
esac
done
if is_submodule "$local_mode" || is_submodule "$remote_mode"
then
echo "Submodule merge conflict for '$MERGED':"
describe_file "$local_mode" "local" "$local_sha1"
describe_file "$remote_mode" "remote" "$remote_sha1"
resolve_submodule_merge
return
fi
if test -f "$MERGED"
then
mv -- "$MERGED" "$BACKUP"
cp -- "$BACKUP" "$MERGED"
fi
# Create a parent directory to handle delete/delete conflicts
# where the base's directory no longer exists.
mkdir -p "$(dirname "$MERGED")"
checkout_staged_file 1 "$MERGED" "$BASE"
checkout_staged_file 2 "$MERGED" "$LOCAL"
checkout_staged_file 3 "$MERGED" "$REMOTE"
if test -z "$local_mode" || test -z "$remote_mode"
then
echo "Deleted merge conflict for '$MERGED':"
describe_file "$local_mode" "local" "$LOCAL"
describe_file "$remote_mode" "remote" "$REMOTE"
resolve_deleted_merge
status=$?
rmdir -p "$(dirname "$MERGED")" 2>/dev/null
return $status
fi
if is_symlink "$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" "$REMOTE"
if test "$guessed_merge_tool" = true || test "$prompt" = true
then
printf "Hit return to start merge resolution tool (%s): " "$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 -- "$MERGED"
cleanup_temp_files
return 0
}
prompt_after_failed_merge () {
while true
do
printf "Continue merging other unresolved paths [y/n]? "
read ans || return 1
case "$ans" in
[yY]*)
return 0
;;
[nN]*)
return 1
;;
esac
done
}
print_noop_and_exit () {
echo "No files need merging"
exit 0
}
main () {
prompt=$(git config --bool mergetool.prompt)
GIT_MERGETOOL_GUI=false
guessed_merge_tool=false
orderfile=
while test $# != 0
do
case "$1" in
--tool-help=*)
TOOL_MODE=${1#--tool-help=}
show_tool_help
;;
--tool-help)
show_tool_help
;;
-t|--tool*)
case "$#,$1" in
*,*=*)
merge_tool=${1#*=}
;;
1,*)
usage ;;
*)
merge_tool="$2"
shift ;;
esac
;;
--no-gui)
GIT_MERGETOOL_GUI=false
;;
-g|--gui)
GIT_MERGETOOL_GUI=true
;;
-y|--no-prompt)
prompt=false
;;
--prompt)
prompt=true
;;
-O*)
orderfile="${1#-O}"
;;
--)
shift
break
;;
-*)
usage
;;
*)
break
;;
esac
shift
done
git_dir_init
require_work_tree
if test -z "$merge_tool"
then
if ! merge_tool=$(get_merge_tool)
then
guessed_merge_tool=true
fi
fi
merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
prefix=$(git rev-parse --show-prefix) || exit 1
cd_to_toplevel
if test -n "$orderfile"
then
orderfile=$(
git rev-parse --prefix "$prefix" -- "$orderfile" |
sed -e 1d
)
fi
if test $# -eq 0 && test -e "$GIT_DIR/MERGE_RR"
then
set -- $(git rerere remaining)
if test $# -eq 0
then
print_noop_and_exit
fi
elif test $# -ge 0
then
# rev-parse provides the -- needed for 'set'
eval "set $(git rev-parse --sq --prefix "$prefix" -- "$@")"
fi
files=$(git -c core.quotePath=false \
diff --name-only --diff-filter=U \
${orderfile:+"-O$orderfile"} -- "$@")
if test -z "$files"
then
print_noop_and_exit
fi
printf "Merging:\n"
printf "%s\n" "$files"
rc=0
set -- $files
while test $# -ne 0
do
printf "\n"
if ! merge_file "$1"
then
rc=1
test $# -ne 1 && prompt_after_failed_merge || exit 1
fi
shift
done
exit $rc
}
main "$@"
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