#!/bin/bash

# Style 
#NC='\e[0m'
#red='\e[0;31m'
#blue='\e[1;34m'
#green='\e[0;32m'
#bold='\e[1m'
#italic='\e[3m'
# ==============================================================================
# Usage and Help
# ==============================================================================
usage() {
    # Format this section with 75 columns.
    cat << EOF
  ${release_script} [-d DATE] [-h] [-e REMOTE] [-r [RC] [SPIN]] [-R [SPIN]]
                  [-S [SPIN]] [-t TRACK] [-u] [-v]
EOF
    return 0
}

extended_usage() {
    echo -e "${bold}Usage:${NC}"
    usage;
    print_info "Run \"${release_script} -help\" for detailed usage information."
}

help()
{
    # Format this section of text with 75 columns.
    #cat << EOF
    echo -e "\
${bold}NAME${NC}
  ${release_script} - The Linaro GCC snapshot, and release script.

${bold}SYNOPSIS${NC}"

    usage

    echo -e "\

${bold}DESCRIPTION${NC}"
    echo -e "\
  \"${release_script}\" is a utility that is used to create tarballs
  and branches for Linaro toolchain GCC monthly snapshots, quarterly
  releases.

  By default ${release_script} creates a snapshot tarball, branch,
  and tag.

  ${bold}REMOTES${NC}
    ${release_script} attempts to be intelligent (and slightly permissive)
    about handling git remote naming.  Its ability to do so is complicated
    by how the Linaro git mirror is set-up.

    Linaro maintains a mirror of the upstream FSF git repository in order
    to locally stage backports, store snapshot and release branches, and store
    snapshot, release candidate, and release tags.

    The Linaro GCC mirror includes a writeable ${bold}linaro-local/${NC} namespace
    that is not present on the upstream FSF git repository.

    The following, Linaro only, writable namespaces are used for storing
    Linaro snapshot and release branches, respectively:

      ${bold}linaro-local/snapshots/${NC}
      ${bold}linaro-local/releases/${NC}

    Linaro provides read-only access to the Linaro GCC mirror via ${italic}gitolite${NC}
    and read-write access (only to the linaro-local/* namespace) via ${italic}gerrit${NC}.

    Here is the recommended setup of the gcc git repository:

      1) Clone the read-only gitolite repository as 'origin':

        git clone https://git.linaro.org/toolchain/gcc.git gcc.git

         ${italic}${bold}Note: ${NC}${italic} If you would like use a remote name other than 'origin' run
         the following command and then replace 'origin' in the examples with
         your desired remote name.${NC}

         git remote rename origin ${italic}<remote>${NC}

      2) Set the pushurl for the default remote as the gerrit server:

        git config remote.origin.pushurl \\
          ssh://review.linaro.org:29418/toolchain/gcc

       3) Set the gerrit username:

           ${italic}${bold}Note: ${NC}${italic}To find your gerrit username look on: review.linaro.org
	     -> [User Name] -> Settings -> username

         git config remote.origin.username ${italic}<Linaro gerrit username>${NC}

    This is an example of what .git/config will look like for remote
    'origin' after setting up the repository:

      [remote "origin"]
              url = https://git.linaro.org/toolchain/gcc.git
              fetch = +refs/heads/*:refs/remotes/origin/*
              pushurl = ssh://review.linaro.org:29418/toolchain/gcc
              username = ryanarn

${bold}PRECONDITIONS${NC}
  ${release_script} needs to be executed in the top-level GCC source
  directory.

  The GCC source directory must be a git repository.  This script will not
  work on a GCC source tarball or a GCC SVN repository.

  See the following subsection on ${bold}REMOTES${NC} for a
  recommendation on how how to clone the GCC repository in a manner which
  will allow pushing changes to the repository.

${bold}OPTIONS${NC}"
    cat << EOF
  -d DATE
                Create DATE snapshot or release.  The DATE may be in the
                following formats: YYYY.MM, YYYY-MM, YYYY/MM, YYYY.MM.DD,
                YYYY-MM-DD, YYYY/MM/DD.  The Default is the current date.

  -e REMOTE
                This specifies the remote (as REMOTE) to use when
                outputting the push instructions.  NOTE: This script does
                not actually push to the remotes.

                It is necessary to designate an alternate FSF remote in
                order to push tags and gcc/LINARO-VERSION updates to the
                upstream branches for snapshots.

  -h
                Print this extended help text.

  -R [SPIN]
                This tells ${release_script} to create a release tarball,
                branch and tag with an optional spin number SPIN.  By
                default no SPIN number is used.  SPIN must be > 0 if
                specified.

  -S [SPIN]
                [Default] This explicitly tells ${release_script} to create
                a snapshot tarball, branch, and tag with an optional spin
                number SPIN.  By default no SPIN number is used.  SPIN must
                be > 0 if specified.

  -r [RC] [SPIN]
                This tells ${release_script} to create a release candidate
                tarball, branch and tag with an optional release candidate
                number RC and an optional spin number SPIN.  By default RC
                number '1' is used and SPIN is left blank/off.  RC must be
                >= 1.  SPIN must be >= 1 if used.  This option will append
                "[-SPIN]-rcRC" on the end of the release string.

                Note: If you want to specify a SPIN you MUST specify an RC
                argument as well or ${release_script} will make the first
                argument the RC value.

  -t TRACK_REF
                Derive (track) the snapshot, release, or release candidate
                from tacked reference TRACK_REF.  The default is to use the
	       	existing branch and not use a tag.

  -v
                Emit verbose output.  Use more than once to increase output
                further.

  -u
EOF
echo -e "\
                Print the short form usage text.  See '${bold}SYNOPSIS${NC}' above.

${bold}EXAMPLES${NC}

  ${bold}Snapshot Examples:

    ${bold}Implicit Snapshot Based on Current Branch:${NC}
      ${release_script}

    ${bold}Explicit Snapshot Based on Current Branch With Today's Date:${NC}
      ${release_script} -S

    ${bold}Snapshot Based on Linaro GCC 5 Branch With Today's Date:${NC}
      ${release_script} -S -b remotes/origin/linaro/gcc-5-branch

    ${bold}Respin Snapshot Based On A Snapshot Branch And An Explicit Date:${NC}
      ${release_script} -S 1 -d 2015.06 \\
      -b remotes/origin/linaro-local/snapshots/linaro-5.1-2015.06

  ${bold}Release Candidate Examples:

    ${bold}Release Candidate With Implicit Spin Number Based On A Snapshot
    Branch And An Explicit Date:${NC}
      ${release_script} -d 2015.06 \\
      -b remotes/origin/linaro-local/snapshots/linaro-5.1-2015.06

    ${bold}Release Candidate Based On A Snapshot Branch And An Explicit Date:${NC}
      ${release_script} -r 1 -d 2015.06 \\
      -b remotes/origin/linaro-local/snapshots/linaro-5.1-2015.06

    ${bold}Release Candidate Respin Based On The Release Branch With An
    Explicit Date:${NC}
      ${release_script} -r 2 -d 2015.06 \\
      -b remotes/origin/linaro-local/releases/linaro-5.1-2015.06

  ${bold}Release Examples:

    ${bold}Release Based on Current Branch With Today's Date:${NC}
      ${release_script} -R

    ${bold}Release Based on Release Branch With An Explicit Date:${NC}
      ${release_script} -R -d 2015.05 \\
      -b remotes/origin/linaro-local/releases/linaro-5.1-2015.06

    ${bold}Release Respin Based on Release Branch With An Explicit Date:${NC}
      ${release_script} -R 1 -d 2015.05 \\
      -b remotes/origin/linaro-local/releases/linaro-5.1-2015.06

${bold}AUTHORS${NC}
  ${release_script} was written by:

    Yvan Roux <yvan.roux@linaro.org>
    Christophe Lyon <christophe.lyon@linaro.org>
    Ryan S Arnold <ryan.arnold@linaro.org>
"
    return 0
}

# ==============================================================================
# Functions
# ==============================================================================
print_info() {
    echo -e "${blue}** ${NC}${1}${NC}"
}

clean() {
    # This will bring us back to the starting directory even if we're already
    # there.
    popd &>/dev/null

    # Return the tree to the starting branch if it's not already there.  We
    # can't be in one of the working branches if we want to delete it.
    if [ "${save_branch:+set}" = "set" ]; then
	print_info "${bold}Returning tree to the saved branch..."
	git checkout ${save_branch} 2>&1>/dev/null
    fi

    if [ -d "$REL_DIR/git" ]; then
	rm -rf $REL_DIR/git
	if [ $? -eq 0 ]; then
	    print_info "Removed ${REL_DIR}/git"
	fi
    fi

    git_out=""

    # check to see if the local_branch has been created.
    git rev-parse --verify ${local_branch} &>/dev/null
    if [ $? -eq 0 ]; then
	git_out=$(git branch -D ${local_branch})
	print_info "${git_out}"
    fi

    if [[ "${SNAPSHOT:+set}" = "set" && "${SPIN:+set}" != "set" ]]; then
	# check to see if the local_int_branch has been created.
	git rev-parse --verify ${local_int_branch} &>/dev/null
	if [ $? -eq 0 ]; then
	    git_out=$(git branch -D ${local_int_branch})
	    print_info "${git_out}"
	fi
    fi

    # If there is a tag created/associated with this release then it should be
    # removed as well.
    if [ x"$(git tag -l ${release_tag})" != x ]; then
	git_out=$(git tag -d ${release_tag})
	print_info "${git_out}"
    fi
}

clean_and_die() {
    echo -e "${red}${bold}ERROR: ${NC}${bold}${1}${NC}"
    clean
    exit 1
}

die() {
    echo -e "${red}${bold}ERROR: ${NC}${bold}${1}${NC}"
    exit 1
}

handle_ctrl_c() {
    # set -x is not well handled by trap and cleanup, so turning it off.
    (( VERBOSITY >= 2 )) && set +x
    clean_and_die "User hit ctrl-c.  Operation aborted."
}

debug_handler() {
    echo "$BASH_COMMAND" | grep -v "echo\|print\|exec\|eval\|\[\|\]"
}

# arg1: a date in any format
# print a sanitized version of the date, or the error
# as generated by `date` if the input is invalid.  The
# return value is non-zero if there's an error.
sanitize_input_date() {
    local in_date="$1"
    in_date=${in_date//./-}

    # If the in_date doesn't include the 'day' add it on
    # because `date` expects it.
    [[ ${#in_date} -lt 8 ]] && { in_date="${in_date}-01"; }

    local sanitized_date=
    sanitized_date="$(date -d ${in_date} +%Y-%m-%d 2>&1)"
    ret=$?
    echo "${sanitized_date}"

    return $ret;
}

# Return true if $1 is a valid tag reference.
is_tag() {
    $(git rev-parse -q --verify $1^{tag} &>/dev/null)
    return $?

}

changelog() {
    echo "${SNAPSHOT:+Snapshot }${release}" > $REL_DIR/git/gcc/LINARO-VERSION
    for cl in $(find $REL_DIR/git -name 'ChangeLog.linaro'); do
	if [ x"$cl" = x"$REL_DIR/git/gcc/ChangeLog.linaro" ]; then
	    cat - $cl > $cl.new <<EOF
$today  $NAME  <$EMAIL>

	$chglmsg
	* LINARO-VERSION: Update.

EOF
	else
	    cat - $cl > $cl.new <<EOF
$today  $NAME  <$EMAIL>

	$chglmsg

EOF
	fi
	mv $cl.new $cl
    done

    if [ ${vstring%%.*} -ge "5" ]; then
	git commit -a -F- <<EOF
${commitmsg}

	gcc/
	* LINARO-VERSION: Update.
EOF
    else
	git commit -a -m "${commitmsg}"
    fi
}

bump_and_dev() {
    local bump_to="$1"
    echo "${bump_to}" > $REL_DIR/git/gcc/LINARO-VERSION
    git commit -q -a -F- <<EOF
	gcc/
	* LINARO-VERSION: Bump version number, post ${SNAPSHOT:+snapshot}${RELEASE:+release}${CANDIDATE:+release candidate}.
EOF
    print_info "${bold}Bumped gcc/LINARO-VERSION to ${bump_to} in $(git rev-parse --abbrev-ref HEAD)"
}

tag() {
    git tag -a ${release_tag} -m "${tagmsg}"
    if [ $? != 0 ]; then
	clean_and_die "Creation of git tag ${release_tag} failed."
    fi

    # Query the git repo for the tag as a sanity step.
    print_info "${bold}Created tag \"${red}$(git tag -l ${release_tag})${NC}${bold}\" with tag message \"${red}${tagmsg}${NC}${bold}\""
}

info() {
    print_info "${bold}${italic}You are about to create ${SNAPSHOT:+snapshot }${RELEASE:+release }${CANDIDATE:+release candidate }${red}${rname}:"
    print_info "${bold}+--------------------------------------------------------------------------------"
    print_info "${bold}+ Tracking remote reference:"
    print_info "${bold}|   ${red}${track}"
    print_info "${bold}+ With new local branch:"
    print_info "${bold}|   ${red}${local_branch}"
    print_info "${bold}+ The ${RELEASE:+release}${SNAPSHOT:+snapshot}${CANDIDATE:+release candidate} will be tagged as:"
    print_info "${bold}|   ${red}${release_tag}"
    print_info "${bold}+ The local branch has gcc/LINARO-VERSION set to:"
    print_info "${bold}|   ${red}$(git show ${track}:gcc/LINARO-VERSION)"
    print_info "${bold}+ For the ${SNAPSHOT:+snapshot}${RELEASE:+release}${CANDIDATE:+release candidate} gcc/LINARO-VERSION will be set:"
    print_info "${bold}|   ${red}${SNAPSHOT:+Snapshot }${release}"
    print_info "${bold}+ The gcc/LINARO-VERSION will be bumped to:"
    print_info "${bold}|   ${red}${bump_mode_to}"
    print_info "${bold}+ The local branch should be pushed to:"
    print_info "${bold}|   ${red}${remote_mode_branch}"
    if [[ "${SNAPSHOT:+set}" = "set" && "${SPIN:+set}" != "set" ]]; then
        print_info "${bold}|  +-----------------------------------------------------------------------------"
	print_info "${bold}|  + The local integration branch is:"
	print_info "${bold}|  |   ${red}${local_int_branch}"
	print_info "${bold}|  + The local integration branch will have gcc/LINARO-VERSION bumped:"
	print_info "${bold}|  |   ${italic}from: ${red}$(git show ${remote_int__branch}:gcc/LINARO-VERSION)"
	print_info "${bold}|  |   ${italic}to:   ${red}${bump_int_to}"
	print_info "${bold}|  + The local integration branch should be pushed to:"
	print_info "${bold}|  |   ${red}${remote_int_branch}"
	print_info "${bold}+--+-----------------------------------------------------------------------------"
    else
	print_info "${bold}+--------------------------------------------------------------------------------"
    fi
    print_info "${italic}${bold}After the build completes push branches and tags to the Linaro git repo:"
}

# Called at the beginning and the end to give pertinent information to the user.
hint() {
    local pushurl=$(git config --get remote.${REMOTE}.pushurl)
    if [ x"${pushurl}" = x ]; then
	print_info "Couldn't determine viable url from remote \"${REMOTE}\""
    fi

    print_info "${bold}+--------------------------------------------------------------------------------"
    print_info "${bold}|  ${italic}NOTE:${NC}${italic} The Linaro GCC git mirror only allows pushes through gerrit"
    print_info "${bold}|  The pushurl for remote \"${REMOTE}\" is:"
    print_info "${bold}|${NC}    ${red}${pushurl}"
    print_info "${bold}|  For gerrit user:"
    print_info "${bold}|${NC}    ${red}$(git config --get remote.${REMOTE}.username)"
    print_info "${bold}+--------------------------------------------------------------------------------"
    print_info "${bold}+  Push local tag ${red}${release_tag}${NC}${bold} to remote \"${REMOTE}\" with:"
    print_info "${bold}|${NC}    git push ${REMOTE} ${release_tag}"
    print_info "${bold}+  Push local branch ${red}${local_branch}${NC}${bold} to remote \"${REMOTE}\" with:"
    print_info "${bold}|${NC}    git push ${REMOTE} ${local_branch}:${remote_mode_branch/remotes\/${REMOTE}/refs/heads}"

    if [[ "${SNAPSHOT:+set}" = "set" && "${SPIN:+set}" != "set" ]]; then
	print_info "${bold}+  Push local integration branch ${red}${local_int_branch}${NC}${bold} to remote \"${REMOTE}\" with:"
	print_info "${bold}|${NC}    git push ${REMOTE} ${local_int_branch}:${remote_int_branch/remotes\/${REMOTE}/refs/heads}"
        print_info "${bold}+--------------------------------------------------------------------------------"
	print_info ""
	print_info "${italic}${bold}Note: ${NC}${italic}Someone with FSF write permission (and a configured fsf remote) will need"
	print_info "${italic}      to push the remote_int_branch changes to the FSF linaro/gcc-${vstring%.*}-branch:"
        print_info "${NC}        git push FSF ${remote_int_branch}:linaro/gcc-${vstring%.*}-branch"
    else
        print_info "${bold}+--------------------------------------------------------------------------------"
    fi
    print_info ""
    print_info "${bold}The ${SNAPSHOT:+snapshot}${RELEASE:+release}${CANDIDATE:+release candidate} tarball is in:"
    print_info "  ${REL_DIR}/gcc-linaro-${rname}.tar.xz"
    print_info "${bold}The ${SNAPSHOT:+snapshot}${RELEASE:+release}${CANDIDATE:+release candidate} tarball signature file is in:"
    print_info "  ${REL_DIR}/gcc-linaro-${rname}.tar.xz.asc"
}

# ==============================================================================
# Settings
# ==============================================================================

# Clear the directory stack so a popd in clean() always returns us to the right
# place.
dirs -c

GIT_REPO="$PWD"
VERBOSITY=0

# Leave these unset by default!
SPIN=
RELEASE=
SNAPSHOT=
RC=
CANDIDATE=
REMOTE=

NAME="$(git config user.name)"
EMAIL="$(git config user.email)"
today="$(date +%Y-%m-%d)"

release_script="$(basename "$0")"

# Arguments.  The first colon puts getopts into silent error reporting mode
# which sets $OPTARG to the unknown option if one is encountered.
while getopts ":b:d:e:hnrRSt:uv" options
do
    case $options in
	d ) DATE=$(sanitize_input_date "$OPTARG")
	    #if [ $? -ne 0 ]; then
		# ${DATE} will contain the error message
		#die "${DATE}"
	    #fi
	    # We only use YYYY.MM format
	    DATE=$(date -d "$DATE" +%Y.%m 2>&1)
	    ;;
	e ) REMOTE="$OPTARG"
	    ;;
	h ) help; exit 1;
	    ;;
	r ) CANDIDATE=1
	    # If the next input is not a -option then it is an optional RC arg.
	    [[ ${!OPTIND} =~ ^-. ]] || { RC=${!OPTIND} ; OPTIND=$(( OPTIND + 1 )); }

	    # If the next input is not a -option then it is an optional SPIN
	    # arg.
	    [[ ${!OPTIND} =~ ^-. ]] || { SPIN=${!OPTIND} ; OPTIND=$(( OPTIND + 1 )); }

	    # The default RC for release candidates is '1'. Set it if it's
	    # undefined or the null string.  The leading colon causes the
	    # variable expansion to take place without evaluating the expansion
	    # as a statement.
	    : ${RC:=1}
	    # SPIN is left unset if not provided by the user.
	    ;;
	R ) RELEASE=1
	    # If the next input is not a -option then it is an optional SPIN
	    # arg.
	    [[ ${!OPTIND} =~ ^-. ]] || { SPIN=${!OPTIND} ; OPTIND=$(( OPTIND + 1 )); }
	    ;;
	S ) SNAPSHOT=1
	    # If the next input is not a -option then it is an optional SPIN
	    # arg.
	    [[ ${!OPTIND} =~ ^-. ]] || { SPIN=${!OPTIND} ; OPTIND=$(( OPTIND + 1 )); }
	    ;;
	t ) TRACK_REF="$OPTARG"
	    ;;
	u ) extended_usage; exit 1;
	    ;;
	v ) (( VERBOSITY=VERBOSITY+1 ))
	    ;;
	\?) print_info "Option -${BOLD}$OPTARG${NC} Unsupported."
	    ;;
	: ) extended_usage; die "Option \"-$OPTARG\" requires an argument."
	    ;;
    esac
done

if [ $# -lt 1 ]; then
    extended_usage
fi

shift $(( OPTIND - 1 ))

# If DATE wasn't set by the user, set it.
: ${DATE:=$(date -d "$today" +%Y.%m)}

if [[ "${RELEASE:+rel}" = "rel" && "${SNAPSHOT:+snap}" = "snap" ]]; then
    die "-R and -S can not be specified at the same time."
elif [[ "${RELEASE:+rel}" = "rel" && "${CANDIDATE:+rc}" = "rc" ]]; then
    die "-R and -r can not be specified at the same time."
elif [[ "${CANDIDATE:+rc}" = "rc" && "${SNAPSHOT:+snap}" = "snap" ]]; then
    die "-r and -S can not be specified at the same time."
fi

# This uses variable substitution to test if SPIN is set, and NOT the empty
# string which protects against -S "" or -R "" (which sets SPIN to the empty
# string).
if [ "${SPIN:+set}" = "set" ]; then
    # Test if the user input contains anything other than numbers.
    if [[ ${SPIN} =~ [^0-9] ]]; then
	die "${RELEASE:+Release}${Snapshot:+Snapshot}${CANDIDATE:+Release candidate} with SPIN input \"${SPIN}\" is not a number."
    elif [[ ${SPIN} -le 0 ]]; then
	die "${RELEASE:+Release}${Snapshot:+Snapshot}${CANDIDATE:+Release candidate} with SPIN number '${SPIN}' must be greater than zero."
    fi
fi

if [ "${RC:+set}" = "set" ]; then
    # Test if the user input contains anything other than numbers.
    if [[ ${RC} =~ [^0-9] ]]; then
	die "Release candidate with RC input \"${RC}\" is not a number."
    elif [[ ${RC} -lt 1 ]]; then
	die "Release candidate with RC number '${RC}' must be greater than one."
    fi
fi

# Test if the current working directory is a git directory.
if [ x"$(git rev-parse --is-inside-work-tree 2>/dev/null)" != xtrue ]; then
    die "${GIT_REPO} is not a git repository."
elif [ ! -d "${GIT_REPO}/gcc" ]; then
    die "${GIT_REPO} is not the top-level GCC source directory."
fi

# Handle verbosity mode
if (( VERBOSITY == 1 )); then
    trap "debug_handler" DEBUG;
elif (( VERBOSITY == 2 )); then
    exec 4> >( grep -v "^++\|echo\|print\|exec\|eval\|\[\|\]" >&2)
    BASH_XTRACEFD=4
    set -x;
elif (( VERBOSITY >= 3 )); then
    set -x;
fi

# If the REMOTE hasn't been specified, default to 'origin'.
: ${REMOTE:=origin}

# Release-Candidates and Releases are both pushed to the release branch
# since there is a strict linear progression from candidates to releases.
#
# If the user is tracking a release tag or candidate tag to build a new
# candidate or release, we need to checkout from the release branch and not the
# tag so that we don't get merge conflicts with a previous rc 'bump' when the
# new series is pushed, or miss a cherry-picked patch on the release branch.
# The following is a merge-conflict due to checking out linaro-6.1-2018.08-rc2
# from the linaro-6.1-2016.08-rc1 tag:
#
#  linaro-local/releases/linaro-6.1-2016.08
#    o - Backport Commit
#    o - FSF Branch Merge Commit
#    o - Snapshot Version Commit
#    o - -rc1 Version Commit     <--- [TAG] linaro-6.1-2016.08-rc1
#    o - -rc2~dev Version Bump Commit   |
#    o - Cherry-Picked Patch Commit     +-- releases/linaro-6.1-2016.08-rc2
#                                            o - Backport Commit
#     ^                                      o - FSF Branch Merge Commit
#     |                                      o - Snapshot Version Commit
#     |                                      o - -rc1 Version Commit
#     |    linaro-6.1-2016.08-rc2 [TAG] ---> o - -rc2 Version Commit
#     |
#     +- merge conflict & merge commit <--- git push
#
# Pushing release/linaro-6.1-2016.08-rc2 onto the remote
# linaro-local/releases/linaro-6.1-2016.08 release branch will cause a merge
# conflict between the "-rc2 Version Commit", "-rc2~dev Version Bump Commit",
# and the "Cherry-Picked Patch Commit".  While a merge commit could be pushed
# to the linaro-local/releases/linaro-6.1-2016.08 remote branch, the newly
# created linaro-6.1-2016.08-rc2 tag would not represent an accurate view of the
# remote branch head.
#
# The correct behavior is use the tag to determine the correct release branch
# and checkout a working branch (releases/linaro-6.2-2016.08-rc2) from that and
# not the tag.
if [ "${CANDIDATE:+set}" = "set" ] || [ "${RELEASE:+set}" = "set" ]; then
    # We only redirect track to a branch if the tag being tracked is not
    # a snapshot tag.
    if [[ $(is_tag $TRACK_REF) -lt 1 ]] && [[ $(echo $TRACK_REF | grep -c "snapshot") -lt 1 ]]; then

	# The git -r switch denotes that we only want remote branches that a tag
	# lives on.  We then have to grep for '${REMOTE}' because users might
	# have more than one remote (e.g., an additional 'gerrit' remote) or have
	# a remote named something other than 'origin'.  The tag might show up on
	# more than one branch so we restrict to the first branch we find.
	BRANCH="`git branch -r --contains ${TRACK_REF} | grep -m 1 ${REMOTE}`"

	# If a branch isn't pushed upstream from a previous invocation, a tag
	# might not exist on a remote branch.  This should produce an error
	# rather than defaulting to 'master'.
	if [ "${BRANCH:+set}" != "set" ]; then
	    clean_and_die "Tag '${TRACK_REF}' not found in any remote branch.  Did you push the release branch from your previous build?"
	fi
	# Remove leading whitespace
	BRANCH="${BRANCH#"${BRANCH%%[![:space:]]*}"}"
	unset TRACK_REF
    fi
fi

# Track either the BRANCH or the TAG
track="${BRANCH:+${BRANCH}}${TRACK_REF:+${TRACK_REF}}"

if [ "x${track}" = "x" ]; then
    # If the user didn't specify a tracking branch, just use the current
    # branch.
    track="$(git rev-parse --abbrev-ref HEAD)"
fi

# Keep track of the branch we start from because we'll want to return there at
# the end or if we have to cleanup prematurely.
save_branch="$(git rev-parse --abbrev-ref HEAD)"

# Test to make sure the branch or tag exists
git rev-parse --abbrev-ref $track &>/dev/null || die "Reference \"$track\" doesn't exist."

if [[ x"$(git remote -v | grep "${REMOTE}")" = x ]]; then
    die "remote ${REMOTE} is not in your git repository."
fi

# Place this here so that all info output is after all die conditions.
if [[ "${RELEASE:+rel}" != "rel" && "${SNAPSHOT:+snap}" != "snap" && "${CANDIDATE:+rc}" != "rc" ]]; then
    print_info "${bold}${release_script} will default to creating a snapshot."
    SNAPSHOT=1
fi

vstring=$(git show "$track":gcc/BASE-VER)
release=${vstring%.*}-"$DATE"

# Some things are only necessary when we're in snapshot mode.
if [ "${SNAPSHOT:+set}" = "set" ]; then
    # The snapshot branch only gets the spin number bumped.
    bump_mode_to="${release}-$(( SPIN + 1 ))~dev"

    # The local integration branch only gets its DATE bumped.  Ask `date` to
    # figure out what the next month is.  Use mid-month as a starting point to
    # allow `date` to compute with accuracy.
    bump_int_date="$(date -d "$(date -d "${DATE//./-}-15" +%Y-%m-%d) +1 month" +%Y.%m)"

    # For next month on the integration branch there is no SPIN number.
    bump_int_to="${vstring%.*}-${bump_int_date}~dev"

    # Due to a change in the GCC branch naming policy, all new GCC releases
    # start with a single digit release.
    if [ ${vstring%%.*} -ge "5" ]; then
	int_vstring=${vstring%%.*}
    else
	# The 4.[1-9] branches have the .[digit] in the branch name.
	int_vstring=${vstring%.*}
    fi

    # This is the local branch where we bump the gcc/LINARO-VERSION to indicate
    # the next month.  We don't need ~dev in the local int branch name.  This
    # will not be used when respinning.
    local_int_branch="snapshots/gcc-${int_vstring}-integration-branch-${bump_int_to%\~dev}"

    # At the end of the script it will recommend that changes to the
    # local_int_branch will be pushed to the remote_int_branch.
    remote_int_branch="remotes/${REMOTE}/linaro-local/gcc-${int_vstring}-integration-branch"
elif [ "${CANDIDATE:+set}" = "set" ]; then
    bump_mode_to="${release}${SPIN:+-${SPIN}}-rc$(( RC + 1 ))~dev"
else
    bump_mode_to="${release}-$(( SPIN + 1 ))-rc$(( RC + 1 ))~dev"
fi

# The local branch can have the SPIN number on the name.
local_branch=${SNAPSHOT:+snapshots/}${RELEASE:+releases/}${CANDIDATE:+releases/}linaro-${release}${SPIN:+-$SPIN}${CANDIDATE:+-rc${RC}}

if [ x"${local_branch}" = x"$(git rev-parse --abbrev-ref HEAD)" ]; then
    die "Local branch \"${local_branch}\" already exists and your tree is checked out in it."
fi

# Release candidates and releases always push against the future or current
# release branch.  Snapshots always go into the snapshots namespace.
remote_mode_branch="remotes/${REMOTE}/linaro-local/${SNAPSHOT:+snapshots}${RELEASE:+releases}${CANDIDATE:+releases}/linaro-${release}"

# The rest of the uses of ${release} should include the SPIN number so add the
# SPIN number if it was specified.
release="${release}${SPIN:+-${SPIN}}${CANDIDATE:+-rc${RC}}"

# Differentiate between Snapshots and Releases, depending on what's set.
rname=${SNAPSHOT:+snapshot-}$release
chglmsg="GCC Linaro ${release} ${SNAPSHOT:+snapshot}${RELEASE:+release}${CANDIDATE:+release candidate}."
commitmsg="Make Linaro GCC ${SNAPSHOT:+Snapshot }${RELEASE:+Release }${CANDIDATE:+Release Candidate }${release}."

#Remove 'Make' for the front, and '.' from the back for the tag message.
tagmsg=${commitmsg#Make }
tagmsg=${tagmsg%.}
release_tag="linaro-${rname}"

REL_DIR="$PWD/../release/gcc-linaro-${rname}"


# ==============================================================================
# Prepare Sources
# ==============================================================================

info
echo -e "\n\n"

print_info "${bold}Creating git work dir \"${REL_DIR}/git\"..."
git-new-workdir $GIT_REPO $REL_DIR/git || die "Couldn't extract sources."
pushd $REL_DIR/git 1>/dev/null

print_info "${bold}Checking out branch \"${local_branch}\"..."
git checkout -B ${local_branch} ${track} 2>/dev/null

print_info "${bold}Creating ${SNAPSHOT:+snapshot}${RELEASE:+release}${CANDIDATE:+release candidate} ChangeLog entries..."

changelog

print_info "${bold}The following commit was made when updating the ChangeLog entries."

# Display the changes from the ChangeLog commit.
git --no-pager show -n 1 ${local_branch} 2>/dev/null
# Empty line seems appropriate for visual continuity.
echo ""

tag

if [[ "${SNAPSHOT:+set}" = "set" && "${SPIN:+set}" != "set" ]]; then
    print_info "${bold}Checking out branch \"${local_int_branch}\"..."
    git checkout -B ${local_int_branch} ${local_branch} 1>/dev/null

    # Bump the integration branch gcc/LINARO-VERSION
    bump_and_dev "${bump_int_to}"
fi

print_info "${bold}Checking out branch \"${local_branch}\"..."
git checkout ${local_branch} 1>/dev/null
bump_and_dev "${bump_mode_to}"

git push ${REMOTE} "${release_tag}"
git push ${REMOTE} "${local_branch}:${remote_mode_branch/remotes\/${REMOTE}/refs/heads}"

if [[ "${SNAPSHOT:+set}" = "set" && "${SPIN:+set}" != "set" ]]; then
    git push ${REMOTE} "${local_int_branch}:${remote_int_branch/remotes\/${REMOTE}/refs/heads}"
fi

popd 1>/dev/null