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#!/bin/bash
#
# updpkgsums - update source checksums in-place in PKGBUILDs
#
# Copyright (C) 2012-2013 Dave Reisner <dreisner@archlinux.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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, see <http://www.gnu.org/licenses/>.

shopt -s extglob

declare -r myname='updpkgsums'
declare -r myver='@PACKAGE_VERSION@'

usage() {
        printf "%s (pacman) v%s\n" "${myname}" "${myver}"
        echo
        printf "%s will perform an in place update of the checksums in the\n" "${myname}"
        echo "path specified by [build file], defaulting to PKGBUILD in the current"
        echo "working directory."
        echo
        printf "Usage: %s [build file]\n" "${myname}"
        echo
        echo "    -h, --help        display this help message and exit"
        echo "    -V, --version     display version information and exit"
}

version() {
        printf "%s %s\n" "$myname" "$myver"
        echo 'Copyright (C) 2012-2013 Dave Reisner <dreisner@archlinux.org>'
}

case $1 in
        -h|--help) usage; exit ;;
        -V|--version) version; exit ;;
esac

buildfile=${1:-PKGBUILD}
if [[ ! -f $buildfile ]]; then
        printf "==> ERROR: %s not found or is not a file\n" "$buildfile"
        exit 1
fi

# Resolve any symlinks to avoid replacing the symlink with a file. But, we
# have to do this portably -- readlink's flags are inconsistent across OSes.
while [[ -L $buildfile ]]; do
        buildfile=$(readlink "$buildfile")
        if [[ $buildfile = */* ]]; then
                cd "${buildfile%/*}"
                buildfile=${buildfile##*/}
        fi
done

# cd into the directory with the build file. This avoids creating random src/
# directories scattered about the filesystem, and avoids cases where we might
# not be able to write in the $PWD.
if [[ $buildfile = */* ]]; then
        cd "${buildfile%/*}"
        buildfile=${buildfile##*/}
fi

# Check $PWD/ for permission to unlink the $buildfile and write a new one
if [[ ! -w . ]]; then
        printf "==> ERROR: No write permission in '%s'\n" "$PWD"
        exit 1
fi

{
        # Generate the new sums and try to unlink the file before writing stdin back
        # into it. This final precaution shouldn't fail based on the previous checks,
        # but it's better to be extra careful before unlinking files.
        export BUILDDIR=$(mktemp -d --tmpdir updpkgsums.XXXXXX)
        trap "rm -rf '$BUILDDIR'" EXIT
        newsums=$(makepkg -g -p "$buildfile") && rm -f "$buildfile" &&
        awk -v newsums="$newsums" '
        /^[[:blank:]]*(md|sha)[[:digit:]]+sums(_[^=]+)?=/,/\)[[:blank:]]*(#.*)?$/ {
                if (!w) {
                        print newsums
                        w++
                }
                next
        }

        1
        END { if (!w) print newsums }
        ' > "$buildfile"
} < "$buildfile"

# vim: set noet: