improve release_upgrade, automate altlinux-release-p8 install

bin/epm-release_upgrade

@@ -80,12 +80,23 @@ __alt_repofix()
 	__replace_text_in_alt_repo "/^ *#/! s!\[[tp][6-9]\]![updates]!g"
 }
 
+__get_conflict_release_pkg()
+{
+	epmqf --quiet --short /etc/fedora-release | head -n1
+}
+
 get_fix_release_pkg()
 {
 	# TODO: check for version incompatibilities
 	if epmqf /etc/altlinux-release | grep -q sisyphus ; then
 		echo altlinux-release-$1
 	fi
+	# workaround against
+	#    file /etc/fedora-release from install of altlinux-release-p8-20160414-alt1 conflicts with file from package branding-simply-linux-release-8.2.0-alt1
+	# problem
+	if __get_conflict_release_pkg | grep -q -v "^altlinux-release" ; then
+		echo altlinux-release-$1 $(__get_conflict_release_pkg)-
+	fi
 }
 
 __update_to_the_distro()
@@ -105,7 +116,7 @@ __update_to_the_distro()
 			docmd epm update || fatal
 			if ! docmd epm install apt rpm apt-conf-branch "$(get_fix_release_pkg "$TO")" ; then
 				# Hack for error: execution of %post scriptlet from glibc-core-2.23-alt1.eter1
-				docmd rpm -ev glibc-core-2.17 || fatal "Check an error and run epm release-upgrade again"
+				#docmd rpm -ev glibc-core-2.17 || fatal "Check an error and run epm release-upgrade again"
 				docmd epm install apt rpm apt-conf-branch "$(get_fix_release_pkg "$TO")" || fatal "Check an error and run epm release-upgrade again"
 			fi
 			__alt_repofix
@@ -118,21 +129,24 @@ __update_to_the_distro()
 			;;
 		Sisyphus)
 			docmd epm update || fatal
-			docmd epm install apt rpm librpm7 librpm apt-conf-sisyphus altlinux-release-sisyphus || fatal "Check an error and run again"
+			docmd epm install apt rpm librpm7 librpm apt-conf-sisyphus altlinux-release-sisyphus $(__get_conflict_release_pkg) || fatal "Check an error and run again"
 			docmd epm upgrade || fatal "Check an error and run epm release-upgrade again"
 			;;
 		*)
 	esac
 }
 
+
 __update_alt_to_next_distro()
 {
-	local TO=""
+	local TO="$2"
 	local FROM="$1"
+	[ -n "$TO" ] || TO="$FROM"
 	info
  	case "$*" in
-		"p6"|"p6 p7"|"t6 p7")
+		"p6"|"p6 p7"|"t6 p7"|"c6 c7")
 			TO="p7"
+			docmd epm install apt rpm
 			info "Upgrade $DISTRNAME from $FROM to $TO ..."
 			docmd epm install apt-conf-branch || fatal
 			__replace_alt_version_in_repo "$FROM/branch/" "$TO/branch/"
@@ -141,8 +155,9 @@ __update_alt_to_next_distro()
 			info "Done."
 			info "Run epm release-upgrade again for update to p8"
 			;;
-		"p7"|"p7 p8"|"t7 p8")
+		"p7"|"p7 p8"|"t7 p8"|"c7 c8"|"p8 p8")
 			TO="p8"
+			docmd epm install apt rpm
 			info "Upgrade $DISTRNAME from $FROM to $TO ..."
 			docmd epm install apt-conf-branch "$(get_fix_release_pkg "$FROM")" || fatal
 			__replace_alt_version_in_repo $FROM/branch/ $TO/branch/
@@ -152,6 +167,7 @@ __update_alt_to_next_distro()
 			;;
 		"Sisyphus p8")
 			TO="p8"
+			docmd epm install apt rpm
 			info "Downgrade $DISTRNAME from $FROM to $TO ..."
 			docmd epm install apt-conf-branch || fatal
 			__replace_alt_version_in_repo "$FROM/" "$FROM/branch/"
@@ -162,6 +178,7 @@ __update_alt_to_next_distro()
 			;;
 		"p8 Sisyphus")
 			TO="Sisyphus"
+			docmd epm install apt rpm
 			info "Upgrade $DISTRNAME from $FROM to $TO ..."
 			docmd epm install apt-conf-branch || fatal
 			docmd epm upgrade || fatal
@@ -173,7 +190,11 @@ __update_alt_to_next_distro()
 			info "Done."
 			;;
 		*)
+			if [ "$FROM" = "$TO" ] ; then
+				info "It seems your system is already updated to newest $DISTRNAME $TO"
+			else
 				warning "Have no idea how to update from $DISTRNAME $FROM to $DISTRNAME $TO."
+			fi
 			info "Try run f.i. # epm release-upgrade p8 or # epm release-upgrade Sisyphus"
 			info "Also possible you need install altlinux-release-p? package for correct distro version detecting"
 			return 1
@@ -186,10 +207,12 @@ epm_release_upgrade()
 	info "Starting upgrade whole system to the next release"
 	info "Check also http://wiki.etersoft.ru/Admin/UpdateLinux"
 
+	# TODO: it is possible eatmydata does not do his work
+	export EPMNOEATMYDATA=1
+
 	case $DISTRNAME in
 	ALTLinux)
 		docmd epm update
-		docmd epm install apt rpm
 
 		# try to detect current release by repo
 		if [ "$DISTRVERSION" = "Sisyphus" ] || [ -z "$DISTRVERSION" ] ; then
@@ -208,6 +231,7 @@ epm_release_upgrade()
 			[ "$(__wcount $pkg_filenames)" = "1" ] || fatal "Too many args: $pkg_filenames"
 		fi
 
+		# TODO: ask before upgrade
 		__update_alt_to_next_distro $DISTRVERSION $pkg_filenames
 		return
 		;;