Comment 4 for bug 309762

The problem is that fstype doesn't detect a ext4 filesystem. It detects it as ext3, and tries to mount the rootfs with "mount -t ext3...", which fails because ext3 can't mount a ext4 filesystem.

The problem is in scripts/local:

========================
get_fstype ()
{
        local FS FSTYPE FSSIZE RET
        FS="${1}"

        # vol_id has a more complete list of file systems,
        # but fstype is more robust
        eval $(fstype "${FS}" 2> /dev/null)
========================

fstype pass ext3 as filesystem there.

It turns out that the "unreliable" vol_id detects the ext4 properly, while fstype does not...