mjhjmtu

I'm trying to create an appropriate /etc/fstab file for my LFS partition, as in LFS part 8.2. How do I find out the file systems for my / mount-point and my swap mount point ( and )? And how do I find out the type of my / mount-point? I'm using a Ubuntu 17.04 host, and this is what I'm using as a model (pasted below).

cat > /etc/fstab << "EOF"
# Begin /etc/fstab

# file system mount-point type options dump fsck
# order

/dev/<xxx> / <fff> defaults 1 1
/dev/<yyy> swap swap pri=1 0 0
proc /proc proc nosuid,noexec,nodev 0 0
sysfs /sys sysfs nosuid,noexec,nodev 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
tmpfs /run tmpfs defaults 0 0
devtmpfs /dev devtmpfs mode=0755,nosuid 0 0

# End /etc/fstab
EO

as per lfs book description:

Replace <xxx>, <yyy>, and <fff> with the values appropriate for the
system, for example, sda2, sda5, and ext4.

your root partition described by:

/dev/<xxx> / <fff> defaults 1 1

is the same partition you set up in chapter "2.4. Creating a New Partition", and later mounted as your $LFS (by default /mnt/lfs). and as per book description it's something like /dev/sda5.

type of root partition (<fff> in fstab example) was set by you in chapter "2.5. Creating a File System on the Partition". by default it is ext4.

if unsure, you can use mount command from your host. wihout any options it returns all mounted partitions, so you look for something like:

/dev/sda9 on /mnt/lfs type ext4 (rw,relatime,data=ordered)

in my case it is device /dev/sda9 and type is ext4, and that's what i put in my fstab for <xxx> and <fff>.

swap partition described by:

/dev/<yyy> swap swap pri=1 0 0

was probably already on your ubuntu host, so you didn't set it up in chapter 2. but we can again look it up in already mounted partitions.
command mount | grep swap will show you only mounted swap partitions. and again, you take device name and substitute <yyy> for it :)

rest of the fstab file you leave as it is in the example, should work without any more changes.

I am not familiar with LFS. But, the "mount" command does a good job of guessing what file system is on the partition. Create a mount point for the partition, mount it, then run the mount command again.

# mkdir -p /mnt/hd
# mount /dev/sdb1 /mnt/hd
# mount

The output of the last command should look something like this:

/dev/sda6 swap swap defaults 0 0
/dev/sda8 / ext4 defaults 1 1
/dev/sda5 /mnt/old ext4 defaults 1 2
/dev/sda7 /usr/src/ ext4 defaults 1 2
/dev/sda9 /var/log ext4 defaults 1 2
/dev/sdb1 /home ext4 defaults 1 2