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guestfs_last_errno() isn't exposed in the perl bindings, meaning it is not directly possible to determine the cause of a failure.

An example which has come up recently in virt-v2v is failure checking on mkdir(). EEXIST would be non-fatal, but any other error would be fatal.

We seem to have agreed to defer this to 6.2.  Setting flags
accordingly.

Patch posted upstream:
https://www.redhat.com/archives/libguestfs/2011-March/msg00077.html

Sorry, this is not the upstream bug, setting state
back to ASSIGNED.

Upstream:
http://git.annexia.org/?p=libguestfs.git;a=commitdiff;h=883390fb2e8cdaf81223eb41c87f245571e3d63d

dev-ack'd for RHEL 6.2.

https://brewweb.devel.redhat.com/taskinfo?taskID=3546057

Verified this using this script:

$ perl <<'EOF'
use Sys::Guestfs;
my $h = Sys::Guestfs->new ();
print $h->last_errno();
EOF

script output:

libguestfs-1.7.17-19:
Can't locate object method "last_errno" via package "Sys::Guestfs" at - line 3.


libguestfs-1.7.17-26:
0

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2011-1512.html