[ALFS Trac] #1738: "make chroot" should umount kernfs even if the shell exits with non-zero code

#1738: "make chroot" should umount kernfs even if the shell exits with non-zero
code
--------------------+------------------------
 Reporter:  xry111  |      Owner:  alfs-log@…
     Type:  defect  |     Status:  new
 Priority:  normal  |  Milestone:
Component:  jhalfs  |    Version:  GIT
 Severity:  normal  |   Keywords:
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 "make chroot" will start an interactive shell, and it's too easy to make
 it exit with non-zero code (for example, pressing Ctrl+C before typing
 "exit").

 So I think we should make the exit code of the shell ignored:

 {{{
 chroot: devices
         -sudo $(CHROOT1)
         $(MAKE) teardown
 }}}

 Add a "-" before "sudo" here.
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Ticket URL: <https://wiki.linuxfromscratch.org/alfs /ticket/1738>
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