malabar // install netbsd on ext2fs from gnu/linux

bsd/ext2fs | bsd/ext2fs-boot | xen guest | kvm guest

this guide has been implemented as a script

descrdescr

no partition table required

fsck_ext2fs has been enhanced therefore this is now possible since netbsd-current Sun Mar 31 13:16:52 2019 UTC (revs 1.36 - 1.39)

requirementsrequirements

grab NetBSD binary sets

virtual diskvirtual disk

guest=nbext2fs

start clean

losetup --list
losetup --all
losetup --detach /dev/loop0

virsh list --all
virsh destroy $guest

prepare the vdisk

mkdir /root/guests/$guest/
cd /root/guests/$guest/

rm -f $guest.sparse
dd if=/dev/zero of=$guest.sparse bs=1G count=0 seek=10
# bs=1000k count=0 seek=4000

bootstrapbootstrap

…

additional notesadditional notes

supported ext2 features

let us test the features that NetBSD 8.99.36 implements

newfs_ext2fs -I -O1 /dev/rxbd1d

then from the gnu/linux host

file $guest.data.sparse
tune2fs -l $guest.data.sparse
dumpe2fs $guest.data.sparse > $guest.data.sparse.dumpe2fs.dist
dumpe2fs $guest.data.sparse | grep ^Group | wc -l #31
dumpe2fs $guest.data.sparse | grep 'Backup superblock' | wc -l #7

gives

Linux rev 1.0 ext2 filesystem data, UUID=29a111d1-03f8-9048-9b95-30446b526f74 (large files)

tune2fs 1.44.1 (24-Mar-2018)
Filesystem volume name:   <none>
Last mounted on:      <not available>
Filesystem UUID:      29a111d1-03f8-9048-9b95-30446b526f74
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      resize_inode filetype sparse_super large_file
Default mount options:    (none)
Filesystem state:    clean
Errors behavior:      Continue
Filesystem OS type:       Linux
Inode count:          500960
Block count:          1000000
Reserved block count:     50000
Free blocks:          982309
Free inodes:          500949
First block:          0
Block size:        4096
Fragment size:      4096
Reserved GDT blocks:      244
Blocks per group:    32768
Fragments per group:      32768
Inodes per group:    16160
Inode blocks per group:   505
Last mount time:      n/a
Last write time:      Sat Mar 30 16:12:01 2019
Mount count:          0
Maximum mount count:      20
Last checked:        Sat Mar 30 16:12:01 2019
Check interval:    15552000 (6 months)
Next check after:    Thu Sep 26 16:12:01 2019
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:          11
Inode size:        128