epm-release_upgrade: drop signs if there are unknown vendor ID during update from repo

bin/epm-release_upgrade

@@ -81,22 +81,29 @@ __replace_alt_version_in_repo()
 	docmd apt-repo list
 }
 
+__alt_replace_sign_name()
+{
+	local TO="$1"
+	__replace_text_in_alt_repo "/^ *#/! s!\[alt\]!$TO!g"
+	__replace_text_in_alt_repo "/^ *#/! s!\[sisyphus\]!$TO!g"
+	__replace_text_in_alt_repo "/^ *#/! s!\[updates\]!$TO!g"
+	__replace_text_in_alt_repo "/^ *#/! s!\[cert[789]\]!$TO!g"
+	__replace_text_in_alt_repo "/^ *#/! s!\[[tpc][6-9]\.?[0-9]?\]!$TO!g"
+}
+
 __alt_repofix()
 {
 	local TO="$1"
 	epm --quiet repo fix >/dev/null
-	# TODO: switch it in repo code
-	TO="$(__repofix_filter_vendor "$TO")"
 
-	# replace sign name
 	if [ -n "$TO" ] ; then
-		__replace_text_in_alt_repo "/^ *#/! s!\[alt\]![$TO]!g"
-		__replace_text_in_alt_repo "/^ *#/! s!\[sisyphus\]![$TO]!g"
-		__replace_text_in_alt_repo "/^ *#/! s!\[updates\]![$TO]!g"
-		__replace_text_in_alt_repo "/^ *#/! s!\[[tpc][6-9]\.?[0-9]?\]![$TO]!g"
+		# TODO: switch it in repo code
+		TO="$(__repofix_filter_vendor "$TO")"
+		__alt_replace_sign_name "[$TO]"
 	fi
 }
 
+
 __get_conflict_release_pkg()
 {
 	epm qf --quiet --short /etc/fedora-release | head -n1
@@ -177,6 +184,15 @@ __check_system()
 	fi
 }
 
+__epm_ru_update()
+{
+    docmd epm update && return
+    epm update 2>&1 | grep "E: Unknown vendor ID" || return
+    info "Drop vendor signs"
+    __alt_replace_sign_name ""
+    docmd epm update
+}
+
 get_next_release()
 {
 	local FROM="$1"
@@ -214,7 +230,7 @@ __switch_alt_to_distro()
 			confirm_info "Upgrade $DISTRNAME from $FROM to $TO ..."
 			docmd epm install rpm apt "$(get_fix_release_pkg "$FROM")" || fatal
 			__switch_repo_to $TO
-			docmd epm update || fatal
+			__epm_ru_update || fatal
 			docmd epm install rpm apt "$(get_fix_release_pkg --force "$TO")" || fatal "Check an error and run epm release-upgrade again"
 			docmd epm upgrade || fatal "Check an error and run epm release-upgrade again"
 			docmd epm update-kernel
@@ -225,7 +241,7 @@ __switch_alt_to_distro()
 			confirm_info "Upgrade $DISTRNAME from $FROM to $TO ..."
 			docmd epm install rpm apt "$(get_fix_release_pkg "$FROM")" || fatal
 			__switch_repo_to $TO
-			docmd epm update || fatal
+			__epm_ru_update || fatal
 			docmd epm install rpm apt "$(get_fix_release_pkg --force "$TO")" || fatal "Check an error and run epm release-upgrade again"
 			__check_system
 			docmd epm upgrade || fatal "Check an error and run epm release-upgrade again"
@@ -236,7 +252,7 @@ __switch_alt_to_distro()
 			confirm_info "Upgrade $DISTRNAME from $FROM to $TO ..."
 			docmd epm install rpm apt "$(get_fix_release_pkg "$FROM")" || fatal
 			__switch_repo_to $TO
-			docmd epm update || fatal
+			__epm_ru_update || fatal
 			docmd epm install rpm apt "$(get_fix_release_pkg --force "$TO")" || fatal "Check an error and run epm release-upgrade again"
 			__check_system
 			docmd epm upgrade || fatal "Check an error and run epm release-upgrade again"
@@ -247,7 +263,7 @@ __switch_alt_to_distro()
 			confirm_info "Upgrade $DISTRNAME from $FROM to $TO ..."
 			docmd epm install rpm apt "$(get_fix_release_pkg "$FROM")" || fatal
 			__switch_repo_to $TO
-			docmd epm update || fatal
+			__epm_ru_update || fatal
 			docmd epm install rpm apt "$(get_fix_release_pkg --force "$TO")" || fatal "Check an error and run epm release-upgrade again"
 			__check_system
 			if epm installed libcrypt >/dev/null ; then
@@ -265,7 +281,7 @@ __switch_alt_to_distro()
 			info "Workaround for https://bugzilla.altlinux.org/show_bug.cgi?id=35492 ..."
 			docmd epm remove gdb || fatal
 			__switch_repo_to $TO
-			docmd epm update || fatal
+			__epm_ru_update || fatal
 			__check_system
 			docmd epm upgrade || fatal "Check an error and run epm release-upgrade again"
 			docmd epm install rpm apt "$(get_fix_release_pkg --force "$TO")" || fatal "Check an error and run epm release-upgrade again"
@@ -276,7 +292,7 @@ __switch_alt_to_distro()
 			confirm_info "Downgrade $DISTRNAME from $FROM to $TO ..."
 			docmd epm install "$(get_fix_release_pkg "$FROM")" || fatal
 			__switch_repo_to $TO
-			docmd epm update || fatal
+			__epm_ru_update || fatal
 			docmd epm downgrade rpm apt "$(get_fix_release_pkg --force "$TO")" || fatal "Check an error and run epm release-upgrade again"
 			__check_system
 			if epm installed libcrypt >/dev/null ; then
@@ -291,7 +307,7 @@ __switch_alt_to_distro()
 			confirm_info "Downgrade $DISTRNAME from $FROM to $TO ..."
 			docmd epm install "$(get_fix_release_pkg "$FROM")" || fatal
 			__switch_repo_to $TO
-			docmd epm update || fatal
+			__epm_ru_update || fatal
 			docmd epm downgrade rpm apt "$(get_fix_release_pkg --force "$TO")" || fatal "Check an error and run epm release-upgrade again"
 			__check_system
 			#if epm installed libcrypt >/dev/null ; then
@@ -306,7 +322,7 @@ __switch_alt_to_distro()
 			confirm_info "Downgrade $DISTRNAME from $FROM to $TO ..."
 			docmd epm install "$(get_fix_release_pkg "$FROM")" || fatal
 			__switch_repo_to $TO
-			docmd epm update || fatal
+			__epm_ru_update || fatal
 			docmd epm install rpm apt "$(get_fix_release_pkg --force "$TO")" || fatal "Check an error and run epm release-upgrade again"
 			__check_system
 			docmd epm downgrade
@@ -319,7 +335,7 @@ __switch_alt_to_distro()
 			docmd epm upgrade || fatal
 			__replace_alt_version_in_repo "$FROM/branch/" "$TO/"
 			__alt_repofix "sisyphus"
-			docmd epm update || fatal
+			__epm_ru_update || fatal
 			docmd epm install rpm apt "$(get_fix_release_pkg --force "$TO")" || fatal "Check an error and run epm release-upgrade again"
 			#local ADDPKG
 			#ADDPKG=$(epm -q --short make-initrd sssd-ad 2>/dev/null)
@@ -353,7 +369,7 @@ epm_release_upgrade()
 
 	case $DISTRNAME in
 	ALTLinux)
-		docmd epm update || fatal
+		__epm_ru_update || fatal
 
 		# try to detect current release by repo
 		if [ "$DISTRVERSION" = "Sisyphus" ] || [ -z "$DISTRVERSION" ] ; then