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| -rw-r--r-- | fuse/guestmount.pod | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fuse/guestmount.pod b/fuse/guestmount.pod index a0bc6f14..c37301c9 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 |