Author: allanjude
Date: Sat Jul 11 17:06:48 2020
New Revision: 363101
URL: https://svnweb.freebsd.org/changeset/base/363101

Log:
  bsdinstall: don't fail if fstab is empty
  
  PR:           210865
  Submitted by: Tim Lukasiewicz <eclipzetec...@gmail.com>, 
h-fujish...@sakura.ad.jp (original version)
  Reported by:  h-fujish...@sakura.ad.jp
  Reviewed by:  sef
  MFC after:    2 weeks
  Sponsored by: Klara Inc.
  Event:                July 2020 Bugathon

Modified:
  head/usr.sbin/bsdinstall/scripts/umount

Modified: head/usr.sbin/bsdinstall/scripts/umount
==============================================================================
--- head/usr.sbin/bsdinstall/scripts/umount     Sat Jul 11 16:57:44 2020        
(r363100)
+++ head/usr.sbin/bsdinstall/scripts/umount     Sat Jul 11 17:06:48 2020        
(r363101)
@@ -39,4 +39,6 @@ cat $PATH_FSTAB | awk -v BSDINSTALL_CHROOT=$BSDINSTALL
 }' > $TMP_FSTAB
 
 umount $BSDINSTALL_CHROOT/dev 2>/dev/null
-umount -F $TMP_FSTAB -a 2>/dev/null
+if [ -n "$TMP_FSTAB" ]; then
+       umount -F $TMP_FSTAB -a 2>/dev/null
+fi
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