#!/bin/bash

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

# Copyright (c) 2008,2009 Novell, Inc.

# All Rights Reserved.

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of version 2 of the GNU General Public License as

# published by the Free Software Foundation.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.   See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, contact Novell, Inc.

#

# To contact Novell about this file by physical or electronic mail,

# you may find current contact information at www.novell.com

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

# add scripts/git-hooks/pre-commit-test

cdup=$(git rev-parse --show-cdup) || exit

cd "${cdup:-./}" || exit

GIT_DIR=$(git rev-parse --git-dir) || exit

check_snippet()

{

    # do not grep for the exact line so that those who really don't like

    # the pre-commit check can add '# kernel-source-pre-commit' to silence

    # the warnings

    grep -qs kernel-source-pre-commit "$GIT_DIR"/hooks/pre-commit

}

install_snippet()

{

    local hookdir="$GIT_DIR"/hooks

    local hook="$hookdir"/pre-commit

    local snippet='

# runs kernel-source-patch-check for each added or modified patch

. "$(dirname "$0")"/kernel-source-pre-commit'

    # fix up old clones that had '$GIT_DIR/hooks' here which doesn't work

    # with older gits

    if grep -qs '"$GIT_DIR"/hooks/' "$hook"; then

        sed -i 's:"\$GIT_DIR"/hooks/:"$(dirname "$0")"/:' "$hook"

    fi

    if check_snippet; then

        return

    fi

    mkdir -p "$hookdir"

    if ! test -x "$hook"; then

        # if the hook was not enabled before, don't run the example code that

        # is usually there

        snippet="$snippet"$'\n'"exit 0"

    fi

    if test -e "$hook"; then

        snippet="$snippet" perl -pi'.orig' -e '

           if (/^[^#]/ && !$inserted) {

               print $ENV{"snippet"} . "\n";

               $inserted = 1;

           }' "$hook"

    else

        (echo '#!/bin/bash'

        echo

        echo "$snippet") >"$hook"

    fi

}

is_eq()

{

    test "$1" -ef "$2" || cmp -s "$1" "$2"

}

clean_attributes()

{

    # Previous versions of this file wrote attributes meant to be distributed

    # with the repository into $GIT_DIR/info/attributes rather than

    # .gitattributes. In order to avoid the former potentially overriding the

    # latter, remove them.

    # If you intentionally want to override these attributes with these values,

    # make sure that the line in your "attributes" file differs, for example,

    # by adding some leading or trailing whitespace to the line.

    if [ -e "$GIT_DIR"/info/attributes ]; then

        sed -i -e '

            /^\*\.changes merge=rpm-changes$/ d

            /^symsets-\*\.tar\.gz diff=symsets$/ d

        ' "$GIT_DIR"/info/attributes

    fi

}

clean_config()

{

    # Previous versions of this file set configuration values meant to be

    # distributed with the repository into the repository-specific

    # configuration file (.git/config). Currently, configuration values are set

    # in a versioned file (extra-gitconfig) which is included from the

    # repository-specific config. Check if the old scheme is in place and

    # update it.

    if ! git config --local --get "include.path" >/dev/null || \

        ! git config --local --get-all "include.path" | \

        grep -q "../extra-gitconfig"; then

        if git config --local --get "merge.rpm-changes.name" >/dev/null; then

            git config --local --remove-section "merge.rpm-changes"

        fi

        if git config --local --get "diff.symsets.textconv" >/dev/null; then

            git config --local --remove-section "diff.symsets"

        fi

        git config --add "include.path" "../extra-gitconfig"

    fi

}

check_scripts()

{

    clean_attributes

    clean_config

    test -x "$GIT_DIR"/hooks/pre-commit && \

    is_eq "$GIT_DIR"/hooks/kernel-source-pre-commit scripts/git-pre-commit

}

# try to create a relative symlink if possible

relative_scripts_dir()

{

    local toplevel=$PWD

    if test "$toplevel/.git" -ef "$GIT_DIR"; then

        echo "../../scripts"

    else

        echo "$toplevel/scripts"

    fi

}

install_scripts()

{

    chmod +x "$GIT_DIR"/hooks/pre-commit

    dir=$(relative_scripts_dir)

    ln -sf "$dir"/git-pre-commit "$GIT_DIR"/hooks/kernel-source-pre-commit

}

case "$1" in

--check)

    check_snippet && check_scripts

    exit

    ;;

"")

    echo "Installing git commit hooks."

    install_snippet

    install_scripts

    echo "Installing git config include directive."

    clean_config

    ;;

*)

    echo "Usage: $0 [--check]" >&2

    exit 1

    ;;

esac

# vim: sw=4 : et