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# Copyright 1999-2007 Gentoo Foundation
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# Distributed under the terms of the GNU General Public License v2
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# $Header: /var/cvsroot/gentoo-x86/eclass/savedconfig.eclass,v 1.13 2010/03/08 04:31:59 jer Exp $
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# @ECLASS: savedconfig.eclass
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# @MAINTAINER:
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# base-system@gentoo.org
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# @BLURB: common API for saving/restoring complex configuration files
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# @DESCRIPTION:
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# It is not uncommon to come across a package which has a very fine
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# grained level of configuration options that go way beyond what
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# USE flags can properly describe. For this purpose, a common API
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# of saving and restoring the configuration files was developed
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# so users can modify these config files and the ebuild will take it
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# into account as needed.
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inherit portability
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IUSE="savedconfig"
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# @FUNCTION: save_config
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# @USAGE: <config files to save>
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# @DESCRIPTION:
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# Use this function to save the package's configuration file into the
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# right location. You may specify any number of configuration files,
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# but just make sure you call save_config with all of them at the same
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# time in order for things to work properly.
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save_config() {
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if [[ ${EBUILD_PHASE} != "install" ]]; then
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die "Bad package! save_config only for use in src_install functions!"
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fi
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case $# in
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0) die "Tell me what to save"
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;;
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1) if [[ -f "$1" ]]; then
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dodir /etc/portage/savedconfig/${CATEGORY}
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cp "$1" "${D}"/etc/portage/savedconfig/${CATEGORY}/${PF} \
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|| die "Failed to save $1"
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else
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dodir /etc/portage/savedconfig/${CATEGORY}/${PF}
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treecopy "$1" "${D}"/etc/portage/savedconfig/${CATEGORY}/${PF} \
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|| die "Failed to save $1"
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fi
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;;
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*)
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dodir "${PORTAGE_CONFIGROOT}"/etc/portage/savedconfig/${CATEGORY}/${PF}
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treecopy $* "${D}/${PORTAGE_CONFIGROOT}"/etc/portage/savedconfig/${CATEGORY}/${PF} \
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|| die "Failed to save $1"
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esac
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elog "Your configuration for ${CATEGORY}/${PF} has been saved in "
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elog "/etc/portage/savedconfig/${CATEGORY}/${PF} for your editing pleasure."
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elog "You can edit these files by hand and remerge this package with"
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elog "USE=savedconfig to customise the configuration."
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elog "You can rename this file/directory to one of the following for"
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elog "its configuration to apply to multiple versions:"
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elog '${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/'
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elog '[${CTARGET}|${CHOST}|""]/${CATEGORY}/[${PF}|${P}|${PN}]'
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}
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# @FUNCTION: restore_config
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# @USAGE: <config files to restore>
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# @DESCRIPTION:
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# Restores the configuation saved ebuild previously potentially with user edits.
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# You can restore a single file or a whole bunch, just make sure you call
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# restore_config with all of the files to restore at the same time.
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#
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# Config files can be laid out as:
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# @CODE
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# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CTARGET}/${CATEGORY}/${PF}
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# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CHOST}/${CATEGORY}/${PF}
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# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CATEGORY}/${PF}
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# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CTARGET}/${CATEGORY}/${P}
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# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CHOST}/${CATEGORY}/${P}
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# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CATEGORY}/${P}
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# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CTARGET}/${CATEGORY}/${PN}
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# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CHOST}/${CATEGORY}/${PN}
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# ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CATEGORY}/${PN}
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# @CODE
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restore_config() {
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use savedconfig || return
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case ${EBUILD_PHASE} in
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unpack|compile|configure|prepare) ;;
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*) die "Bad package! restore_config only for use in src_{unpack,compile,configure,prepare} functions!" ;;
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esac
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local found check configfile
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local base=${PORTAGE_CONFIGROOT}/etc/portage/savedconfig
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for check in {${CATEGORY}/${PF},${CATEGORY}/${P},${CATEGORY}/${PN}}; do
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configfile=${base}/${CTARGET}/${check}
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[[ -r ${configfile} ]] || configfile=${base}/${CHOST}/${check}
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[[ -r ${configfile} ]] || configfile=${base}/${check}
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einfo "Checking existence of ${configfile} ..."
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if [[ -r "${configfile}" ]]; then
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einfo "found ${configfile}"
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found=${configfile};
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break;
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fi
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done
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if [[ -f ${found} ]]; then
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elog "Building using saved configfile ${found}"
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if [ $# -gt 0 ]; then
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cp -pPR "${found}" "$1" || die "Failed to restore ${found} to $1"
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else
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die "need to know the restoration filename"
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fi
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elif [[ -d ${found} ]]; then
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elog "Building using saved config directory ${found}"
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local dest=${PWD}
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pushd "${found}" > /dev/null
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treecopy . "${dest}" || die "Failed to restore ${found} to $1"
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popd > /dev/null
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else
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# maybe the user is screwing around with perms they shouldnt #289168
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if [[ ! -r ${base} ]] ; then
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eerror "Unable to read ${base} -- please check its permissions."
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die "Reading config files failed"
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fi
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ewarn "No saved config to restore - please remove USE=savedconfig or"
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ewarn "provide a configuration file in ${PORTAGE_CONFIGROOT}/etc/portage/savedconfig/${CATEGORY}/${PN}"
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ewarn "Your config file(s) will not be used this time"
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fi
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}
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