[SOLVED] no /dev/disk/by-uuid in initramfs

pll · n00b Joined: 16 Dec 2011 Posts: 19

My root partition is not on the same drive as the bootloader and kernel. I'm trying to mount root by uuid within an initramfs (I need the initramfs for other things) but /dev/disk/by-uuid does not exist. Manually running blkid does list devices and their uuid's, I suppose I could hack something together with that.

I was just wondering if I could get some help with how /dev/disk/by-uuid gets populated. I've tried mounting devtmpfs and running mdev -s but neither do the trick, though they do bring up /dev/sdb sdc etc..

Thanks for any help.
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eccerr0r · Posted: Wed Aug 01, 2012 1:45 pm Post subject:

You could try installing udev into initramfs. Udev creates the uuid directories.

mdev is a miniature udev, which doesn't fully populate /dev.

Could you do it without the uuid directories? I think you should just hack it - Translate uuid to /dev/xxx with the help of blkid...
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pll · n00b Joined: 16 Dec 2011 Posts: 19

I see. I suppose it's not worth installing udev in it's entirety.

I just had a look at blkid's man pages it turns out you can simply do

SlashBeast · Retired Dev Joined: 23 May 2006 Posts: 2922

You can also use findfs, here you have resolve_device function, under BSD license: https://github.com/slashbeast/better-initramfs/blob/master/sourceroot/functions.sh#L48
Supports LABEL= and UUID=.