[Ovirt-devel] [PATCH node] add rescue mode

[Alan Pevec]

Append "rescue" boot parameter to invoke an emergency shell early in the
boot process, right after the persistent configuration is mounted.
This can be used for debugging and fixing configuration issues.

Signed-off-by: Alan Pevec <apevec at redhat.com>
---
 scripts/ovirt-early |   21 ++++++++++++++++++++-
 1 files changed, 20 insertions(+), 1 deletions(-)

diff --git a/scripts/ovirt-early b/scripts/ovirt-early
index bc0f58d..ac54e4b 100755
--- a/scripts/ovirt-early
+++ b/scripts/ovirt-early
@@ -134,6 +134,7 @@ start() {
     #   ovirt_local_boot
     #   ovirt_standalone
     #   ovirt_firstboot
+    #   rescue
     #   pxelinux format: ip=<client-ip>:<boot-server-ip>:<gw-ip>:<netmask>
     #   anaconda format: ip=<client-ip> netmask=<netmask> gateway=<gw-ip>
     #   ipv6=dhcp|auto
@@ -194,6 +195,10 @@ start() {
     # in auto-install mode, overwrite the disk chosen by ovirt_init parameter
     firstboot=
 
+    #   rescue
+    # enter emergency shell for fixing configuration issues
+    rescue=
+
     #   pxelinux format: ip=<client-ip>:<boot-server-ip>:<gw-ip>:<netmask>
     #   anaconda format: ip=<client-ip> netmask=<netmask> gateway=<gw-ip>
     #   ipv6=dhcp|auto
@@ -304,6 +309,9 @@ start() {
             ovirt_firstboot*)
             firstboot=1
             ;;
+            rescue)
+            rescue=1
+            ;;
 
             ovirt_overcommit*)
             i=${i#ovirt_overcommit=}
@@ -378,6 +386,15 @@ start() {
         fi
     fi
 
+    if [ "$rescue" = 1 ]; then
+        log "Rescue mode requested, starting emergency shell"
+        stop_log
+        plymouth --hide-splash
+        bash < /dev/console
+        plymouth --show-splash
+        start_log
+    fi
+
     if [ "$standalone" = 1 ]; then
         # In standalone mode, fix libvirt to not use gssapi
         sed -c -i -e s/^keytab/#keytab/ \
@@ -436,10 +453,12 @@ case "$1" in
         printf "Starting ovirt-early: "
 
         {
+            start_log
             log "Starting ovirt-early"
             start
             log "Completed ovirt-early"
-        } >> $OVIRT_LOGFILE 2>&1
+            stop_log
+        }
 
         test $? == 0 && success || failure
         echo
-- 
1.6.0.6