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installing grub in chroot environment
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mgnut57
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Joined: 12 Jan 2008
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PostPosted: Sun Sep 29, 2019 5:25 am    Post subject: installing grub in chroot environment Reply with quote

I am attempting to copy a running system into a new system.

I have copied all the system folders to a new filesystem, which is stored on /dev/sdc1 and mounted.

I have bind-mounted /dev and /proc in the appropriate place on the mount of /dev/sdc1.

Attempting to install grub2 doesn't seem to be working:

Code:
grub2-install /dev/sdc
Installing for i386-pc platform.
Unknown device "/dev/sdc1": No such device
Unknown device "/dev/sdc1": No such device
Unknown device "/dev/sdc1": No such device
Unknown device "/dev/sdc2": No such device
Unknown device "/dev/sdc1": No such device
Unknown device "/dev/sdc1": No such device
Unknown device "/dev/sdc1": No such device
Unknown device "/dev/sdc1": No such device
Installation finished. No error reported.

It claims to have finished, but the file command shows no bootloader:
Code:
# file -s /dev/sdc
/dev/sdc: DOS/MBR boot sector


This may all need to be re-done because I am cloning to much newer hardware with UEFI, but I would like to get it solved.
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NeddySeagoon
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PostPosted: Sun Sep 29, 2019 8:30 am    Post subject: Reply with quote

mgnut57,

mgnut57 wrote:
I am attempting to copy a running system into a new system.


You can only do that if you have a way to create filesystem snapshots.
Any files you have open for writing will have incomplete contents on disk.
Worse, the directory tree pointing to files you have open for writing will be cached and updated in RAM.
In other words, a live filesystem is a mess that cannot usefully be copied.

Even if the copy succeeds and it may give all the appearances of working, it won't boot.
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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APolozov
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Location: Voronezh, Russia

PostPosted: Sun Sep 29, 2019 11:56 am    Post subject: Reply with quote

IMHO solution is in this place https://wiki.gentoo.org/wiki/Quick_Installation_Checklist#Chroot
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