In libguestfs we use /dev/fd/<NN> to pass pre-opened file descriptors to qemu-img. Lately I've discovered that although this works, qemu believes that these are floppy disk images. That in itself isn't much of a problem, but now qemu prints a warning about host floppy pass-thru being deprecated.
Extend the existing test so that it ignores /dev/fd/ as well as /dev/fdset/ A simple test of this, if you are using the bash shell, is: qemu-img info <( cat /dev/null ) without this patch: $ qemu-img info <( cat /dev/null ) qemu-img: Host floppy pass-through is deprecated Support for it will be removed in a future release. qemu-img: Could not open '/dev/fd/63': Could not refresh total sector count: Illegal seek with this patch: $ qemu-img info <( cat /dev/null ) qemu-img: Could not open '/dev/fd/63': Could not refresh total sector count: Illegal seek Signed-off-by: Richard W.M. Jones <rjo...@redhat.com> Fixes: https://bugs.launchpad.net/qemu/+bug/1470536 --- block/raw-posix.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/raw-posix.c b/block/raw-posix.c index cbe6574..855febe 100644 --- a/block/raw-posix.c +++ b/block/raw-posix.c @@ -2430,7 +2430,8 @@ static int floppy_probe_device(const char *filename) struct stat st; if (strstart(filename, "/dev/fd", NULL) && - !strstart(filename, "/dev/fdset/", NULL)) { + !strstart(filename, "/dev/fdset/", NULL) && + !strstart(filename, "/dev/fd/", NULL)) { prio = 50; } -- 2.3.1
