[OSSTEST,30/38] overlay-initrd-buster/sbin/reopen-console: Copy from Debian
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Message ID 20200519190230.29519-31-ian.jackson@eu.citrix.com
State New
Headers show
Series
  • Upgrade most hosts/guests to buster
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Commit Message

Ian Jackson May 19, 2020, 7:02 p.m. UTC
We are going to patch this file to work around a bug, using the new
overlay mechanism.

The first step is to include the file in our overlay so we overwrite
it.  Currently, this is a no-op, so no functional change.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
---
 overlay-initrd-buster/sbin/reopen-console | 94 +++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100755 overlay-initrd-buster/sbin/reopen-console

Patch
diff mbox series

diff --git a/overlay-initrd-buster/sbin/reopen-console b/overlay-initrd-buster/sbin/reopen-console
new file mode 100755
index 00000000..dd354deb
--- /dev/null
+++ b/overlay-initrd-buster/sbin/reopen-console
@@ -0,0 +1,94 @@ 
+#!/bin/sh
+
+# First find the enabled consoles from the kernel, noting if one is 'preferred'
+# Record these.
+# Run the startup scripts on the preferred console
+
+# In order to have D-I appear on all consoles, modify the inittab to
+# add one entry for each console, running debian-installer.
+# Finally HUP init so that it runs those installers
+# (but doesn't rerun the sysinit startup stuff, including this script)
+
+
+NL="
+"
+
+LOGGER_UP=0
+LOG_FILE=/var/log/reopen-console
+
+log() {
+	# In very early startup we don't have syslog. Log to file that
+	# we can flush out later so we can at least see what happened
+	# at early startup
+	if [ $LOGGER_UP -eq 1 ]; then
+	        logger -t reopen-console "$@"
+	else
+		echo "$@" >> $LOG_FILE
+	fi
+}
+
+flush_logger () {
+	cat $LOG_FILE | logger -t reopen-console
+	rm $LOG_FILE
+}
+
+consoles=
+preferred=
+# Retrieve all enabled consoles from kernel; ignore those
+# for which no device file exists
+
+kernelconsoles="$(cat /proc/consoles)"
+for cons in $(echo "$kernelconsoles" | sed -n -r -e 's/(^.*)  .*\((.*)\).*$/\1/p' )
+do
+	log "Looking at console $cons from /proc/consoles"
+	status=$(echo "$kernelconsoles" | grep $cons | sed -n -r -e 's/(^.*) *.*\((.*)\).*$/\2/p' )
+	if [ -e "/dev/$cons" ] && [ $(echo "$status" | grep -o 'E') ]; then
+		consoles="${consoles:+$consoles$NL}$cons"
+		log "   Adding $cons to consoles list"
+	fi
+	# 'C' console is 'most prefered'.
+	if [ $(echo "$status" | grep -o 'C') ]; then
+		preferred="$cons"
+		log "   $cons is preferred"
+	fi
+done
+
+if [ -z "$consoles" ]; then
+	# Nothing found? Default to /dev/console.
+	log "Found no consoles! Defaulting to /dev/console"
+	consoles=console
+fi
+if [ -z "$preferred" ]; then
+	#None marked preferred? Use the first one
+	preferred=$(echo "$consoles" | head -n 1)
+	log "Found no preferred console. Picking $preferred"
+fi
+
+for cons in $consoles
+do
+	echo "/dev/$cons " >> /var/run/console-devices
+done
+echo "/dev/$preferred " > /var/run/console-preferred
+
+
+# Add debian-installer lines into inittab - one per console
+for cons in $consoles
+do
+	log "Adding inittab entry for $cons"
+	echo "$cons::respawn:/sbin/debian-installer" >> /etc/inittab
+done
+
+# Run the startup scripts once, using the preferred console
+cons=$(cat /var/run/console-preferred)
+# Some other session may have that console as ctty. Steal it from them
+/sbin/steal-ctty $cons "$@"
+
+# Now we should have syslog running, so flush our log entries
+LOGGER_UP=1
+flush_logger
+
+# Finally restart init to run debian-installer on discovered consoles
+log "Restarting init to start d-i on the consoles we found"
+kill -HUP 1
+
+exit 0