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When the result guestfs_disk_format() is not known, free the string before returning an error. --- lib/launch-libvirt.c | 1 + 1 file changed, 1 insertion(+) diff --git a/lib/launch-libvirt.c b/lib/launch-libvirt.c index e4961f201..844023b80 100644 --- a/lib/launch-libvirt.c +++ b/lib/launch-libvirt.c @@ -197,6 +197,7 @@ get_source_format_or_autodetect (guestfs_h *g, struct drive *drv) error (g, _("could not auto-detect the format.\n" "If the format is known, pass the format to libguestfs, eg. u...

libvirt doesn't have a concept of "session qemu" for root: https://bugzilla.redhat.com/show_bug.cgi?id=890291 When a libguestfs-using process runs as root, and libvirt runs a qemu subprocess, the qemu subprocess is run as a non-root user (typically qemu.qemu). This causes various problems, for example if we try to open a file which is readable by root but unreadable by qemu.qemu