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#
# git-flow -- A collection of Git extensions to provide high-level
# repository operations for Vincent Driessen's branching model.
#
# Original blog post presenting this model is found at:
# http://nvie.com/git-model
#
# Feel free to contribute to this project at:
# http://github.com/nvie/gitflow
#
# Copyright 2010 Vincent Driessen. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY VINCENT DRIESSEN ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
# EVENT SHALL VINCENT DRIESSEN OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
# OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# The views and conclusions contained in the software and documentation are
# those of the authors and should not be interpreted as representing official
# policies, either expressed or implied, of Vincent Driessen.
#

require_git_repo
require_gitflow_initialized
gitflow_load_settings
VERSION_PREFIX=$(eval "echo `git config --get gitflow.prefix.versiontag`")
PREFIX=$(git config --get gitflow.prefix.release)

usage() {
echo "usage: git flow release [list] [-v]"
echo " git flow release start [-F] <version> [<base>]"
echo " git flow release finish [-Fsumpk] <version>"
echo " git flow release publish <name>"
echo " git flow release track <name>"
}

cmd_default() {
cmd_list "$@"
}

cmd_list() {
DEFINE_boolean verbose false 'verbose (more) output' v
parse_args "$@"

local release_branches
local current_branch
local short_names
release_branches=$(echo "$(git_local_branches)" | grep "^$PREFIX")
if [ -z "$release_branches" ]; then
warn "No release branches exist."
                warn ""
                warn "You can start a new release branch:"
                warn ""
                warn " git flow release start <name> [<base>]"
                warn ""
exit 0
fi

current_branch=$(git branch --no-color | grep '^\* ' | grep -v 'no branch' | sed 's/^* //g')
short_names=$(echo "$release_branches" | sed "s ^$PREFIX g")

# determine column width first
local width=0
local branch
for branch in $short_names; do
local len=${#branch}
width=$(max $width $len)
done
width=$(($width+3))

local branch
for branch in $short_names; do
local fullname=$PREFIX$branch
local base=$(git merge-base "$fullname" "$DEVELOP_BRANCH")
local develop_sha=$(git rev-parse "$DEVELOP_BRANCH")
local branch_sha=$(git rev-parse "$fullname")
if [ "$fullname" = "$current_branch" ]; then
printf "* "
else
printf " "
fi
if flag verbose; then
printf "%-${width}s" "$branch"
if [ "$branch_sha" = "$develop_sha" ]; then
printf "(no commits yet)"
else
local nicename=$(git rev-parse --short "$base")
printf "(based on $nicename)"
fi
else
printf "%s" "$branch"
fi
echo
done
}

cmd_help() {
usage
exit 0
}

parse_args() {
# parse options
FLAGS "$@" || exit $?
eval set -- "${FLAGS_ARGV}"

# read arguments into global variables
VERSION=$1
BRANCH=$PREFIX$VERSION
}

require_version_arg() {
if [ "$VERSION" = "" ]; then
warn "Missing argument <version>"
usage
exit 1
fi
}

require_base_is_on_develop() {
if ! git branch --no-color --contains "$BASE" 2>/dev/null \
| sed 's/[* ] //g' \
| grep -q "^$DEVELOP_BRANCH\$"; then
die "fatal: Given base '$BASE' is not a valid commit on '$DEVELOP_BRANCH'."
fi
}

require_no_existing_release_branches() {
local release_branches=$(echo "$(git_local_branches)" | grep "^$PREFIX")
local first_branch=$(echo ${release_branches} | head -n1)
first_branch=${first_branch#$PREFIX}
[ -z "$release_branches" ] || \
die "There is an existing release branch ($first_branch). Finish that one first."
}

cmd_start() {
DEFINE_boolean fetch false "fetch from $ORIGIN before performing finish" F
parse_args "$@"
BASE=${2:-$DEVELOP_BRANCH}
require_version_arg
require_base_is_on_develop
require_no_existing_release_branches

# sanity checks
require_clean_working_tree
require_branch_absent "$BRANCH"
require_tag_absent "$VERSION_PREFIX$VERSION"
if flag fetch; then
git fetch -q "$ORIGIN" "$DEVELOP_BRANCH"
fi
if has "$ORIGIN/$DEVELOP_BRANCH" $(git_remote_branches); then
require_branches_equal "$DEVELOP_BRANCH" "$ORIGIN/$DEVELOP_BRANCH"
fi

# create branch
git checkout -b "$BRANCH" "$BASE"

echo
echo "Summary of actions:"
echo "- A new branch '$BRANCH' was created, based on '$BASE'"
echo "- You are now on branch '$BRANCH'"
echo
echo "Follow-up actions:"
echo "- Bump the version number now!"
echo "- Start committing last-minute fixes in preparing your release"
echo "- When done, run:"
echo
echo " git flow release finish '$VERSION'"
echo
}

cmd_finish() {
DEFINE_boolean fetch false "fetch from $ORIGIN before performing finish" F
DEFINE_boolean sign false "sign the release tag cryptographically" s
DEFINE_string signingkey "" "use the given GPG-key for the digital signature (implies -s)" u
DEFINE_string message "" "use the given tag message" m
DEFINE_boolean push false "push to $ORIGIN after performing finish" p
DEFINE_boolean keep false "keep branch after performing finish" k
DEFINE_boolean notag false "don't tag this release" n

parse_args "$@"
require_version_arg

# handle flags that imply other flags
if [ "$FLAGS_signingkey" != "" ]; then
FLAGS_sign=$FLAGS_TRUE
fi

# sanity checks
require_branch "$BRANCH"
require_clean_working_tree
if flag fetch; then
git fetch -q "$ORIGIN" "$MASTER_BRANCH" || \
die "Could not fetch $MASTER_BRANCH from $ORIGIN."
git fetch -q "$ORIGIN" "$DEVELOP_BRANCH" || \
die "Could not fetch $DEVELOP_BRANCH from $ORIGIN."
fi
if has "$ORIGIN/$MASTER_BRANCH" $(git_remote_branches); then
require_branches_equal "$MASTER_BRANCH" "$ORIGIN/$MASTER_BRANCH"
fi
if has "$ORIGIN/$DEVELOP_BRANCH" $(git_remote_branches); then
require_branches_equal "$DEVELOP_BRANCH" "$ORIGIN/$DEVELOP_BRANCH"
fi

# try to merge into master
# in case a previous attempt to finish this release branch has failed,
# but the merge into master was successful, we skip it now
if ! git_is_branch_merged_into "$BRANCH" "$MASTER_BRANCH"; then
git checkout "$MASTER_BRANCH" || \
die "Could not check out $MASTER_BRANCH."
git merge --no-ff "$BRANCH" || \
die "There were merge conflicts."
# TODO: What do we do now?
fi

if noflag notag; then
# try to tag the release
# in case a previous attempt to finish this release branch has failed,
# but the tag was set successful, we skip it now
local tagname=$VERSION_PREFIX$VERSION
if ! git_tag_exists "$tagname"; then
local opts="-a"
flag sign && opts="$opts -s"
[ "$FLAGS_signingkey" != "" ] && opts="$opts -u '$FLAGS_signingkey'"
[ "$FLAGS_message" != "" ] && opts="$opts -m '$FLAGS_message'"
git tag $opts "$tagname" || \
die "Tagging failed. Please run finish again to retry."
fi
fi

# try to merge into develop
# in case a previous attempt to finish this release branch has failed,
# but the merge into develop was successful, we skip it now
if ! git_is_branch_merged_into "$BRANCH" "$DEVELOP_BRANCH"; then
git checkout "$DEVELOP_BRANCH" || \
die "Could not check out $DEVELOP_BRANCH."

# TODO: Actually, accounting for 'git describe' pays, so we should
# ideally git merge --no-ff $tagname here, instead!
git merge --no-ff "$BRANCH" || \
die "There were merge conflicts."
# TODO: What do we do now?
fi

# delete branch
if noflag keep; then
if [ "$BRANCH" = "$(git_current_branch)" ]; then
git checkout "$MASTER_BRANCH"
fi
git branch -d "$BRANCH"
CHECK_REMOTE=$(git branch -r | grep "$ORIGIN"/"$BRANCH" | wc -l)
                if [ $CHECK_REMOTE = 1 ]; then
git push "$ORIGIN" :"$BRANCH"
                fi
fi

if flag push; then
git push "$ORIGIN" "$DEVELOP_BRANCH" || \
die "Could not push to $DEVELOP_BRANCH from $ORIGIN."
git push "$ORIGIN" "$MASTER_BRANCH" || \
die "Could not push to $MASTER_BRANCH from $ORIGIN."
if noflag notag; then
git push --tags "$ORIGIN" || \
die "Could not push tags to $ORIGIN."
fi
git push "$ORIGIN" :"$BRANCH" || \
die "Could not delete the remote $BRANCH in $ORIGIN."
fi

echo
echo "Summary of actions:"
echo "- Latest objects have been fetched from '$ORIGIN'"
echo "- Release branch has been merged into '$MASTER_BRANCH'"
if noflag notag; then
echo "- The release was tagged '$tagname'"
fi
echo "- Release branch has been back-merged into '$DEVELOP_BRANCH'"
if flag keep; then
echo "- Release branch '$BRANCH' is still available"
else
echo "- Release branch '$BRANCH' has been deleted"
fi
if flag push; then
echo "- '$DEVELOP_BRANCH', '$MASTER_BRANCH' and tags have been pushed to '$ORIGIN'"
echo "- Release branch '$BRANCH' in '$ORIGIN' has been deleted."
fi
echo
}

cmd_publish() {
parse_args "$@"
require_version_arg

# sanity checks
require_clean_working_tree
require_branch "$BRANCH"
git fetch -q "$ORIGIN"
require_branch_absent "$ORIGIN/$BRANCH"

# create remote branch
git push "$ORIGIN" "$BRANCH:refs/heads/$BRANCH"
git fetch -q "$ORIGIN"

# configure remote tracking
git config "branch.$BRANCH.remote" "$ORIGIN"
git config "branch.$BRANCH.merge" "refs/heads/$BRANCH"
git checkout "$BRANCH"

echo
echo "Summary of actions:"
echo "- A new remote branch '$BRANCH' was created"
echo "- The local branch '$BRANCH' was configured to track the remote branch"
echo "- You are now on branch '$BRANCH'"
echo
}

cmd_track() {
parse_args "$@"
require_version_arg

# sanity checks
require_clean_working_tree
require_branch_absent "$BRANCH"
git fetch -q "$ORIGIN"
require_branch "$ORIGIN/$BRANCH"

# create tracking branch
git checkout -b "$BRANCH" "$ORIGIN/$BRANCH"

echo
echo "Summary of actions:"
echo "- A new remote tracking branch '$BRANCH' was created"
echo "- You are now on branch '$BRANCH'"
echo
}
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