From: "Richard W.M. Jones" <rjo...@redhat.com> See also: https://bugzilla.redhat.com/show_bug.cgi?id=835466#c9 --- fuse/guestmount.pod | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/fuse/guestmount.pod b/fuse/guestmount.pod index a0bc6f1..c37301c 100644 --- a/fuse/guestmount.pod +++ b/fuse/guestmount.pod @@ -106,6 +106,22 @@ namespace using the Linux-specific L<clone(2)>/L<unshare(2)> flag C<CLONE_NEWNS>. Unfortunately at the moment this requires root and we would also probably need to add it as a feature to guestmount. +=head2 Race conditions possible when shutting down the connection + +When C<fusermount -u> exits, guestmount may still be running and +cleaning up the mountpoint. The disk image will not be fully +finalized. + +This means that scripts like the following have a nasty race +condition: + + guestmount -a disk.img -i /mnt + # copy things into /mnt + fusermount -u /mnt + # immediately try to use 'disk.img' <-- UNSAFE + +The solution is to spin waiting for the guestmount process to exit. + =head1 OPTIONS =over 4 -- 1.7.10.4 _______________________________________________ Libguestfs mailing list Libguestfs@redhat.com https://www.redhat.com/mailman/listinfo/libguestfs