freddierice/go-losetup

A losetup implementation for go-lang

go-losetup's Issues

tag new release?

hey!
it'd be great to tag a new release with the latest commits at some point :-)

unable to mount partition after losetup

Thanks for the great package!

I use the example program to attach one device, but seems like unable to mount it. Can you help with it?

# losetup
NAME       SIZELIMIT OFFSET AUTOCLEAR RO BACK-FILE                DIO LOG-SEC
/dev/loop0         0      0         0  0 /tmp/deploy/newimage.img   0     512

# fdisk -l
Disk /dev/loop0: 4.9 GiB, 5242880000 bytes, 10240000 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x9f0032d8

Device       Boot   Start      End Sectors  Size Id Type
/dev/loop0p1 *       2048  2099199 2097152    1G 83 Linux
/dev/loop0p2      2099200  3123199 1024000  500M 82 Linux swap / Solaris
/dev/loop0p3      3123200 10239999 7116800  3.4G 83 Linux

# mount /dev/loop0p1 ./tt/
mount: /tmp/deploy/tt: special device /dev/loop0p1 does not exist.

Try again on -EAGAIN from SetInfo64 syscall

See https://lkml.org/lkml/2021/6/15/185, w/ the upstream util-linux maintainer agreeing to do likewise for the command-line losetup tool.

This error can also happen while changing the block size.

It's not unreasonable to make this the caller's job (so they can make decisions about number of retries, delays between them, etc); but it's probably worth documenting the need for the caller to check for the case if that's the chosen behavior.