[pacman-dev] [PATCH] updpkgsums: add new contrib script

[Dave Reisner]

On Mon, Jan 09, 2012 at 08:51:57PM -0500, Dave Reisner wrote:
> updpkgsums updates checksums in a PKGBUILD "in place"
> ---
> This is really a whole lot of sanity checking and very little actual noise,
> but given what this script does (deleting a file), I chose to err on the
> side of extreme caution.
> 
> I remembered to add to .gitignore this time!
> 
>  contrib/.gitignore    |    1 +
>  contrib/Makefile.am   |    5 ++-
>  contrib/updpkgsums.in |   90 +++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 95 insertions(+), 1 deletions(-)
>  create mode 100755 contrib/updpkgsums.in
> 
> diff --git a/contrib/.gitignore b/contrib/.gitignore
> index 19b81e0..4f8e1e7 100644
> --- a/contrib/.gitignore
> +++ b/contrib/.gitignore
> @@ -7,5 +7,6 @@ paclog-pkglist
>  pacscripts
>  pacsearch
>  pacsysclean
> +updpkgsums
>  wget-xdelta.sh
>  zsh_completion
> diff --git a/contrib/Makefile.am b/contrib/Makefile.am
> index eca39e7..fab8d7c 100644
> --- a/contrib/Makefile.am
> +++ b/contrib/Makefile.am
> @@ -12,7 +12,8 @@ OURSCRIPTS = \
>  	paclog-pkglist \
>  	pacscripts \
>  	pacsearch \
> -	pacsysclean
> +	pacsysclean \
> +	updpkgsums
>  
>  OURFILES = \
>  	bash_completion \
> @@ -29,6 +30,7 @@ EXTRA_DIST = \
>  	pacscripts.in \
>  	pacsearch.in \
>  	pacsysclean.in \
> +	updpkgsums.in \
>  	vimprojects \
>  	zsh_completion.in \
>  	README
> @@ -84,6 +86,7 @@ pacscripts: $(srcdir)/pacscripts.in
>  pacsearch: $(srcdir)/pacsearch.in
>  pacsysclean: $(srcdir)/pacsysclean.in
>  pactree: $(srcdir)/pactree.in
> +updpkgsums: $(srcdir)/updpkgsums.in
>  zsh_completion: $(srcdir)/zsh_completion.in
>  
>  # vim:set ts=2 sw=2 noet:
> diff --git a/contrib/updpkgsums.in b/contrib/updpkgsums.in
> new file mode 100755
> index 0000000..304f5db
> --- /dev/null
> +++ b/contrib/updpkgsums.in
> @@ -0,0 +1,90 @@
> +#!/bin/bash
> +#
> +# updpkgsums - update source checksums in-place in PKGBUILDs
> +#
> +# Copyright (C) 2012 Dave Reisner <dreisner at archlinux.org>
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License
> +# as published by the Free Software Foundation; either version 2
> +# of the License, or (at your option) any later version.
> +#
> +# This program is distributed in the hope that it will be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program.  If not, see <http://www.gnu.org/licenses/>.
> +
> +shopt -s extglob
> +
> +declare -r myname='updpkgsums'
> +declare -r myver='@PACKAGE_VERSION@'
> +
> +usage() {
> +	printf 'usage: %s [buildfile]\n\n' "$myname"
> +	printf '    -h, --help        display this help message and exit\n'
> +	printf '    -V, --version     display version information and exit\n\n'
> +	printf '%s will perform an in place update the checksums in the\n' "$myname"
> +	printf 'path specified by [buildfile], defaulting to PKGBUILD in the current\n'
> +	printf 'working directory.\n'
> +}
> +
> +version() {
> +	printf "%s %s\n" "$myname" "$myver"
> +	echo 'Copyright (C) 2012 Dave Reisner <dreisner at archlinux.org>'
> +}
> +
> +case $1 in
> +	-h|--help) usage; exit ;;
> +	-V|--version) version; exit ;;
> +esac
> +
> +buildfile=${1:-PKGBUILD}
> +if [[ ! -f $buildfile ]]; then
> +	printf $'==> ERROR: \`%s\' not found or is not a file: %s\n' "$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 OS's.
> +while [[ -L $buildfile ]]; do
> +	buildfile=$(readlink "$buildfile")
> +	cd "${buildfile%/*}"
> +	buildfile=${buildfile##*/}

Thought of an edge case where this fails last night before I went to
sleep. When the symlink contains no slashes, it'll cd to nowhere. Fixed
on my local by wrapping the cd and buildfile reassignment in the if
condition: [[ $buildfile = */* ]].

> +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.
> +	newsums=$(makepkg -g -p "$buildfile") && rm -f "$buildfile" &&
> +	exec awk -v newsums="$newsums" '
> +	/^[[:blank:]]*(md|sha)[[:digit:]]+sums=/,/\)[[:blank:]]*(#.*)?$/ {
> +		if (!w) {
> +			print newsums
> +			w++
> +		}
> +		next
> +	}
> +
> +	1
> +	' > "$buildfile"
> +} < "$buildfile"
> +
> +# vim: set ts=2 sw=2 noet:
> -- 
> 1.7.8.3
> 
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