ocp_merge.sh

#!/bin/bash

######################################################################
# ocp-merge: Merge origin to enterprise in preparation for a release
#
# Usage: Takes no options. Just run it.
#
# Note: This is heavily based on versionmerge which was originally
#       written by Tim Bielawa.
#
# smunilla@redhat.com
######################################################################

if [ "${1}" = "--help" -o "${1}" = "-h" ]; then
    cat <<EOF
usage: ${0}
   default behavior - parenting fixed, prompted to review diffs at end

usage: ${0} {GIT-DIFF ARGS}
   pass arbitrary args/options to the git-diff at the end

Attempts to maintain the proper qa->stage->master merge history that
we want to see.

In other words: fix 'current stage is not a child of..' errors.

Your branches must be named 'qa', 'stage', and 'master' for this to
work. The correct remote will be figured out automatically.


You may optionally set/erase the default git-diff options:

   SET default diff options:

      ${0} --set-diff-options -b
      ${0} --set-diff-options --no-color --stat

   ERASE default diff options:

      ${0} --erase-diff-options

EOF
    exit 0;
fi

function get_diff_options() {
    git config --get merge.versionmerge.diffoptions
}

function has-branch {
    branch=$1
    git branch --no-color | grep -q " ${branch}$"
}

thisbranch() {
    git branch --no-color | sed -r -n "s/(\* )(.*)/\2/p"
}

function fix-branch {
    branch=$1
    parent=$2
    git checkout --quiet ${1}
    ${RESET}${1}
    git merge -m "merging ${2} into ${1}" --quiet ${2}
    break_on_conflict $?
}

RESET=": "

hr() {
    cat <<EOF

#############################################

EOF
}

if [ "${1}" = "--set-diff-options" ]; then
    shift
    git config --global --unset merge.versionmerge.diffoptions
    echo "Setting default diff options to: '${*}'"
    git config --global merge.versionmerge.diffoptions "$*"
    echo "Default diff options are now set to: '`get_diff_options`'"
    exit 0
elif [ "${1}" = "--erase-diff-options" ]; then
    git config --global --unset merge.versionmerge.diffoptions
    echo "Default diff options have been erased"
    exit 0
fi

if [[ ! -z ${1} ]]; then
    shift
    to_merge=${1}
else
    echo "Must specify a remote repo to merge"
    exit 1
fi

list_conflicts() {
    git status | grep "both modified:" | tr "#" " "
}

break_on_conflict() {
    if [[ "${1}" -ne "0" ]]; then
        cat <<EOF

     >>>>> Merge Conflict Detected! <<<<<

To continue:

  1. resolve these conflicts:
`list_conflicts`

  2. 'git add' the changed files
  3. 'git commit'
  4. 'ocp-merge'

You may have to repeat this process if content is conflicting.

               THIS IS EXPECTED BEHAVIOR.

     Continue until ocp-merge runs straight through.

EOF
        exit 1
    fi
}

STARTBRANCH=`thisbranch`

git fetch --all

echo "Aligning all your branches now..."

hr

if has-branch master; then
    echo "Aligning master"
	fix-branch master $to_merge
fi

hr

git checkout --quiet ${STARTBRANCH}

cat <<EOF
Back on ${STARTBRANCH} and all lined up!
EOF