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# Copyright 1999-2007 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/savedconfig.eclass,v 1.10 2009/04/11 15:19:50 vapier Exp $
# @ECLASS: savedconfig.eclass
# @MAINTAINER:
# base-system@gentoo.org
# @BLURB: common API for saving/restoring complex configuration files
# @DESCRIPTION:
# It is not uncommon to come across a package which has a very fine
# grained level of configuration options that go way beyond what
# USE flags can properly describe. For this purpose, a common API
# of saving and restoring the configuration files was developed
# so users can modify these config files and the ebuild will take it
# into account as needed.
inherit portability
IUSE="savedconfig"
# @FUNCTION: save_config
# @USAGE: <config files to save>
# @DESCRIPTION:
# Use this function to save the package's configuration file into the
# right location. You may specify any number of configuration files,
# but just make sure you call save_config with all of them at the same
# time in order for things to work properly.
save_config() {
if [[ ${EBUILD_PHASE} != "install" ]]; then
die "Bad package! save_config only for use in src_install functions!"
fi
case $# in
0) die "Tell me what to save"
;;
1) if [[ -f "$1" ]]; then
dodir /etc/portage/savedconfig/${CATEGORY}
cp "$1" "${D}"/etc/portage/savedconfig/${CATEGORY}/${PF} \
|| die "Failed to save $1"
else
dodir /etc/portage/savedconfig/${CATEGORY}/${PF}
treecopy "$1" "${D}"/etc/portage/savedconfig/${CATEGORY}/${PF} \
|| die "Failed to save $1"
fi
;;
*)
dodir "${PORTAGE_CONFIGROOT}"/etc/portage/savedconfig/${CATEGORY}/${PF}
treecopy $* "${D}/${PORTAGE_CONFIGROOT}"/etc/portage/savedconfig/${CATEGORY}/${PF} \
|| die "Failed to save $1"
esac
elog "Your configuration for ${CATEGORY}/${PF} has been saved in "
elog "/etc/portage/savedconfig/${CATEGORY}/${PF} for your editing pleasure."
elog "You can edit these files by hand and remerge this package with"
elog "USE=savedconfig to customise the configuration."
elog "You can rename this file/directory to one of the following for"
elog "its configuration to apply to multiple versions:"
elog '${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/'
elog '[${CTARGET}|${CHOST}|""]/${CATEGORY}/[${PF}|${P}|${PN}]'
}
# @FUNCTION: restore_config
# @USAGE: <config files to restore>
# @DESCRIPTION:
# Restores the configuation saved ebuild previously potentially with user edits.
# You can restore a single file or a whole bunch, just make sure you call
# restore_config with all of the files to restore at the same time.
#
# Config files can be laid out as:
# @CODE
# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CTARGET}/${CATEGORY}/${PF}
# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CHOST}/${CATEGORY}/${PF}
# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CATEGORY}/${PF}
# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CTARGET}/${CATEGORY}/${P}
# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CHOST}/${CATEGORY}/${P}
# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CATEGORY}/${P}
# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CTARGET}/${CATEGORY}/${PN}
# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CHOST}/${CATEGORY}/${PN}
# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CATEGORY}/${PN}
# @CODE
restore_config() {
use savedconfig || return
case ${EBUILD_PHASE} in
unpack|compile|prepare)
;;
*) die "Bad package! restore_config only for use in src_{unpack,compile,prepare} functions!"
;;
esac
local found;
local base=${PORTAGE_CONFIGROOT}/etc/portage/savedconfig
for check in {${CATEGORY}/${PF},${CATEGORY}/${P},${CATEGORY}/${PN}}; do
configfile=${base}/${CTARGET}/${check}
[[ -r ${configfile} ]] || configfile=${base}/${CHOST}/${check}
[[ -r ${configfile} ]] || configfile=${base}/${check}
einfo "Checking existence of ${configfile} ..."
if [[ -r "${configfile}" ]]; then
einfo "found ${configfile}"
found=${configfile};
break;
fi
done
if [[ -f ${found} ]]; then
elog "Building using saved configfile ${found}"
if [ $# -gt 0 ]; then
cp -pPR "${found}" "$1" || die "Failed to restore ${found} to $1"
else
die "need to know the restoration filename"
fi
elif [[ -d ${found} ]]; then
elog "Building using saved config directory ${found}"
dest=${PWD}
pushd "${found}" > /dev/null
treecopy . "${dest}" || die "Failed to restore ${found} to $1"
popd > /dev/null
elif [[ -a {found} ]]; then
die "do not know how to handle non-file/directory ${found}"
else
eerror "No saved config to restore - please remove USE=savedconfig or"
eerror "provide a configuration file in ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CATEGORY}/${PN}"
die "config file needed when USE=savedconfig is specified"
fi
}
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