[Libguestfs] guestunmount issues

[Maxim Perevedentsev]

Hello everyone!

I'm playing with guestunmount and got the following issues:

1) guestunmount never returns 3 (not mounted) - i guess it's a bug at 
guestunmount.c:223

2) I don't know whether it's a bug in guestunmount or fusermount, but on 
my machine while executing
 > guestmount
 > guestunmount
 > guestunmount
on second "guestunmount" I get
"guestunmount: failed to unmount {...}: fusermount: failed to unmount 
{...}: Invalid argument"
while, according to guestunmount.c, guestunmount should return something 
like
"entry for {} not found"

3)
 > fusermount -u {}
gives me "Invalid argument" as well, while
 > umount {}
handles this error successfully and returns "not mounted".
(strace logs attached)

I have a custom centos7-based distro, but I don't think it matters.

I'd like someone to compare results with mine, and, possibly, give me 
some explanations about why it's going like this and how to distinguish 
non-mounted mountpoints from busy ones (I guess I'll have to parse 
umount {} output).

Thanks in advance!

-- 
Your sincerely,
Maxim Perevedentsev

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