The script allows a person to review and apply a 3 way merge of a given
file. I find it useful for my work especially with the merge process we
chose.
We have a process where we bring lots of different types of code (java,
javascript, sql) together in a merge. A lot of parallel development
happens in different branches, so when those branches merge there is
inevitably a merge conflict. The merge engineer is usually only familiar
with one or two of the source code types being merged. We wanted a process
by which we could assign out the task to merge different file types to
different engineers. We did not really find a good way to do this.
Here is the process we ended.
1) Merge engineer merges two branches
2) Merge results in conflicts
3) Merge engineer does a best effort attempt at resolving merges.
4) Any remaining ugly merges are committed with their merge annotations
5) Build is now broken
6) Merge engineer emails responsible engineers informing them of the
conflicts and instructing them to fix
7) Each Engineer merges their individual files by hand
8) Each engineer commits the fixed files.
Not necessarily ideal, but it is the best process we could come up with
given our constraints.
I tend to use git remerge in step 7. Since the merge annotations are ugly
and difficult to understand I wanted to use a three way merge to see the
conflict and resolve the conflict. Git really does not have a command like
mergetool to look at a resolved file. So I created a script. The next
thing I would like to do with the script is make it use the preconfigured
user preferred merge tool. Right now I use meld.
#!/bin/bash -x
usage() {
cat << EOF
usage: $0 [merge revision] [--] file
Launch meld in a three way comparison, allows remerging files already
merged.
OPTIONS:
merge revision: The revision that contains the merge. Defaults to
HEAD
--: Seperate the args from the file name. Conventionaly git
argument style
file: The name of the file in the repository meld will be used to
redo the merge
EOF
}
if [[ $# == 1 ]] ; then
export TARGET_FILE=$1
export MERGE_VERSION=HEAD
elif [[ $# == 2 ]] ; then
export TARGET_FILE=$2
export MERGE_VERSION=$1
elif [[ $# == 3 && ${2}a == "--a" ]] ; then
export TARGET_FILE=$3
export MERGE_VERSION=$1
else
usage
exit
fi
if [[ `git log -1 $MERGE_VERSION | grep -o "^Merge:"`a != "Merge:a" ]] ;
then
echo "Not a merge commit: $MERGE_VERSION"
exit 1
fi
export LEFT_VERSION=`git log -1 $MERGE_VERSION | grep "^Merge:" | sed -e
's/Merge: //g' | grep -o "^[a-f0-9]\+"`
export RIGHT_VERSION=`git log -1 $MERGE_VERSION | grep "^Merge:" | grep -o
"[^ ]\+\$"`
export BASE_VERSION=`git merge-base $LEFT_VERSION $RIGHT_VERSION`
export LEFT_FILE=`tempfile -p $(basename $TARGET_FILE) -s
-${LEFT_VERSION:0:6}`
export RIGHT_FILE=`tempfile -p $(basename $TARGET_FILE) -s
-${RIGHT_VERSION:0:6}`
export BASE_FILE=`tempfile -p $(basename $TARGET_FILE) -s
-${BASE_VERSION:0:6}`
git show $LEFT_VERSION:$TARGET_FILE > $LEFT_FILE
git show $RIGHT_VERSION:$TARGET_FILE > $RIGHT_FILE
git show $BASE_VERSION:$TARGET_FILE > $BASE_FILE
meld --output $TARGET_FILE $LEFT_FILE $BASE_FILE $RIGHT_FILE
#meld --auto-merge --output $TARGET_FILE $LEFT_FILE $BASE_FILE $RIGHT_FILE
rm $LEFT_FILE $RIGHT_FILE $BASE_FILE
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