added savedconfig.eclass - draft 1

1 files changed, 124 insertions, 0 deletions

diff --git a/eclass/savedconfig.eclass b/eclass/savedconfig.eclass
new file mode 100644
index 000000000000..3b863144b81d
--- /dev/null
+++ b/eclass/savedconfig.eclass
@@ -0,0 +1,124 @@
+# 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 1.1 2007/02/04 13:43:34 dragonheart Exp $
+
+# Original Author: Daniel Black <dragonheart@gentoo.org>
+#
+# Purpose: Define an interface for ebuilds to save and restore
+# complex configuration that may be edited by users.
+#
+
+# TODO
+#
+# - Move away from cp --parents because BSD doesn't like it
+
+# Should I be using: $PORTAGE_CONFIGROOT ???? Whatever it means, whereever it is
+# documented.
+
+IUSE="savedconfig"
+
+# save_config
+#
+# Saves the files and/or directories to
+# /etc/portage/savedconfig/${CATEGORY}/${PF}
+# If a single file is specified ${PF} is that file else it is a directory
+# containing all specified files and directories.
+#
+
+save_config() {
+	case ${EBUILD_PHASE} in
+		preinst|install)
+		;;
+		*) die "Bad package!  save_config only for use in pkg_preinst or src_install functions!"
+		;;
+	esac
+	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}
+				cp --parents -pPR "$1" "${D}"/etc/portage/savedconfig/${CATEGORY}/${PF} \
+					|| die "Failed to save $1"
+			fi
+			;;
+		*)
+			dodir /etc/portage/savedconfig/${CATEGORY}/${PF}
+			while [ "$1" ]; do
+				cp --parents -pPR "$1" "${D}"/etc/portage/savedconfig/${CATEGORY}/${PF} \
+					|| die "Failed to save $1"
+				shift
+			done
+	esac
+}
+
+
+# restore_config
+#
+# Restores the configuation saved ebuild previously potentially with user edits
+#
+# Requires the name of the file to restore to if a single file was given to
+# save_config. Otherwise it restores the directory structure.
+#
+# Looks for config files in the following order.
+# ${ROOT}/etc/portage/savedconfig/${CTARGET}/${CATEGORY}/${PF}
+# ${ROOT}/etc/portage/savedconfig/${CHOST}/${CATEGORY}/${PF}
+# ${ROOT}/etc/portage/savedconfig/${CATEGORY}/${PF}
+# ${ROOT}/etc/portage/savedconfig/${CTARGET}/${CATEGORY}/${P}
+# ${ROOT}/etc/portage/savedconfig/${CHOST}/${CATEGORY}/${P}
+# ${ROOT}/etc/portage/savedconfig/${CATEGORY}/${P}
+# ${ROOT}/etc/portage/savedconfig/${CTARGET}/${CATEGORY}/${PN}
+# ${ROOT}/etc/portage/savedconfig/${CHOST}/${CATEGORY}/${PN}
+# ${ROOT}/etc/portage/savedconfig/${CATEGORY}/${PN}
+#
+#
+
+restore_config() {
+	use savedconfig || return
+
+	case ${EBUILD_PHASE} in
+		unpack|compile)
+		;;
+		*) die "Bad package!  save_config only for use in pkg_preinst or src_install functions!"
+		;;
+	esac
+	local found;
+	local base=${ROOT}/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
+		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 ${found} ]]; then
+		dest=${PWD}
+		pushd "${found}"
+		cp --parents . "${DEST}" \
+			|| die "Failed to restore ${found} to $1"
+		popd
+	elif [[ -a {found} ]]; then 
+		die "do not know how to handle non-file/directory ${found}"
+	else
+		eerror "No saved config to restore - please remove USE=saveconfig or"
+		die "provide a configuration file in /etc/portage/savedconfig/${CATEGORY}/${PN}"
+	fi
+}
+
+
+#warn_config() {
+#
+#}