Cannot mount squashfs

Installing and Using OpenWrt
1

what am I doing wrong here? Tried creating squashfs with lzma(according to https://openwrt.org/docs/techref/filesystems) and gzip(the only one built into shfs-tools-mk). Both compressions fail with the error about compression not supported in kernel message.

Thx, KN

root@novitk:/mnt# mount -t squashfs -o loop /mnt/backup/oldroot-X7SPA.sqsh /mnt/oldroot-X7SPA
mount: mounting /dev/loop0 on /mnt/oldroot-X7SPA failed: Invalid argument
root@novitk:/mnt# dmesg | tail -n 1
[491431.807170] squashfs: SQUASHFS error: Filesystem uses "lzma" compression. This is not supported

2

You need to install "xz" tools (contains support for xz and lzma) on your host system (where you try to mount the file).

3

Didn't help. Also this only changes user space, no? The issue I think is in the kernel.

root@novitk:~# opkg list | grep xz
xz - 5.2.4-5
xz-utils - 5.2.4-5
root@novitk:~# opkg list | grep lzma
liblzma - 5.2.4-5
python3-lzma - 3.7.7-3
root@novitk:~# opkg list | grep zlib
kmod-lib-zlib-deflate - 4.14.180-1
kmod-lib-zlib-inflate - 4.14.180-1
zlib - 1.2.11-3

4

I thought xz is enough. But maybe it is stripped for embedded systems. Anyway try to install liblzma. xz-utils looks to me like a "complete package" including liblzma?

You would need kernel support if you want to start/mount images during system start. So e. g. initramfs should have support for it. But that should be handled by the Makefiles already.

For just mounting/reading xz (tools) should be enough.

5

not embedded, the install is from
https://downloads.openwrt.org/releases/19.07.3/targets/x86/64/openwrt-19.07.3-x86-64-combined-ext4.img.gz
perhaps it's stripped there, as it's not squashfs based.