Use absolute path symlinks to create ostree layout

[wegel]

Otherwise non-root directories (eg, /usr/local) won't work.

[GrabbenD]

Thank you for contributing and great catch:

[root@ostree ~]# readlink /usr/local
var/usrlocal
[root@ostree ~]# cd /usr/local
-bash: cd: /usr/local: No such file or directory

In spirit of keeping the same symlink syntax as other Linux distros in /, let's only fix the faulty symlink:

Default (Arch Linux)

bin -> usr/bin
boot
dev
etc
home
lib -> usr/lib
lib64 -> usr/lib
mnt
opt
proc
root
run
sbin -> usr/bin
srv
sys
tmp
usr
var

OSTREE_CREATE_LAYOUT

bin -> usr/bin
boot
dev
etc
home -> var/home
kuk
lib -> usr/lib
lib64 -> usr/lib
mnt -> var/mnt
opt -> var/opt
ostree -> sysroot/ostree
proc
root -> var/roothome
run
sbin -> usr/bin
srv -> var/srv
sys
sysroot
tmp
usr
var

Proposed change

bin -> usr/bin
boot
dev
home -> /var/home
lib -> usr/lib
lib64 -> usr/lib
mnt -> /var/mnt
opt -> /var/opt
ostree -> /sysroot/ostree
proc
root -> /var/roothome
run
sbin -> usr/bin
srv -> /var/srv
sys
sysroot
tmp
usr
var