OpenHPC:fixes

Preshell/Postshell fix

• Identify the bootstrap that the relevant node is using, from the node's MAC address (for example fa:16:3e:cc:30:e3):

[root@ohpc-head ~]# ls /var/lib/tftpboot/warewulf/pxelinux.cfg/
01-fa-16-3e-34-14-bd  01-fa-16-3e-8f-2c-f2  01-fa-16-3e-fc-44-6d
01-fa-16-3e-3c-75-21  01-fa-16-3e-cc-30-e3
[root@ohpc-head ~]# cat /var/lib/tftpboot/warewulf/pxelinux.cfg/01-fa-16-3e-cc-30-e3 
# Configuration for Warewulf node: caas01
# Warewulf data store ID: 18
DEFAULT bootstrap
LABEL bootlocal
LOCALBOOT 0
LABEL bootstrap
SAY Now booting caas01 with Warewulf bootstrap (3.10.0-327.22.2.el7.x86_64)
KERNEL bootstrap/11/kernel
APPEND ro initrd=bootstrap/11/initfs.gz wwhostname=caas01 quiet wwmaster=10.16.0.150 wwipaddr=10.16.0.151 wwnetmask=255.255.255.0 wwnetdev=eth0 wwgateway=10.16.0.150

In the KERNEL and APPEND values we can see that it's using bootstrap 11

• We now need to unzip and uncompress the initfs image of this bootstrap to a temp directory:

[root@ohpc-head ~]# mkdir /tmp/initfs-dir
[root@ohpc-head ~]# ls /var/lib/tftpboot/warewulf/bootstrap/11/
cookie  initfs.gz  kernel
[root@ohpc-head ~]# cp /var/lib/tftpboot/warewulf/bootstrap/11/initfs.gz /tmp/initfs-dir/
[root@ohpc-head ~]# cd /tmp/initfs-dir/
[root@ohpc-head initfs-dir]# gunzip initfs.gz
[root@ohpc-head initfs-dir]# ls 
initfs
[root@ohpc-head initfs-dir]# mkdir uncompressed
[root@ohpc-head initfs-dir]# cd uncompressed/
[root@ohpc-head uncompressed]# cat ../initfs | cpio -i
113303 blocks
[root@ohpc-head uncompressed]# ls
bin  dev  etc  init  lib  lib64  proc  sbin  tmp  usr  var  warewulf

• Change the relevant lines in /init:

@@ -240,7 +240,7 @@ 
 if [ $WWDEBUG -ge 3 ]; then 
     echo 
     echo "Spawning a debug shell. Exit to continue provisioning." 
-    setsid cttyhack sh 
+    setsid /bin/cttyhack /bin/sh 
     echo "Continuing provisioning process." 
     echo 
 fi 
@@ -317,7 +317,7 @@ 
     echo "due to the 'preshell' Warewulf node configuration... So be it!" 
     echo 
     wwlogger "PRESHELL defined, waiting for local shell to exit" 
-    setsid cttyhack sh 
+    setsid /bin/cttyhack /bin/sh 
 fi 
  
 wwlogger "Starting the provision handler" 
@@ -331,7 +331,7 @@ 
     echo "due to the 'postshell' Warewulf node configuration... So be it!" 
     echo 
     wwlogger "POSTSHELL defined, waiting for local shell to exit" 
-    setsid cttyhack sh 
+    setsid /bin/cttyhack /bin/sh 
 fi

• Change the relevant line in etc/functions:

@@ -160,5 +160,5 @@
     echo "Spawning a debug shell."
     echo "System will reboot automatically when you close the shell."
     echo
     rm /reboot
-    setsid cttyhack sh
+    setsid /bin/cttyhack /bin/sh
     wwlogger "Node rebooting"

• Compress the initfs back:

[root@ohpc-head uncompressed]# find ./* | cpio -o -c > ../initfs
113303 blocks
[root@ohpc-head uncompressed]# cd ..
[root@ohpc-head initfs-dir]# ls
initfs  uncompressed
[root@ohpc-head initfs-dir]# gzip initfs 
[root@ohpc-head initfs-dir]# ls
initfs.gz  uncompressed

• Finally copy the compresses initfs.gz back to its original location:

[root@ohpc-head initfs-dir]# cp initfs.gz /var/lib/tftpboot/warewulf/bootstrap/11/

• Reboot the relevant node and if you've set its provision POSTSHELL and/or PRESHELL arguments to TRUE then the shells will work fine