Re: sed append in preseed/late_command

[Philip Hands <phil@hands.com>]

Jack Bates <q34yzh@nottheoilrig.com> writes:

> Hi,
>
> How can I use sed in preseed/late_command to insert a new line, two 
> lines after the line which contains "<!-- Volume definitions -->", in 
> pam_mount.conf.xml?
>
> Normally I'd use something like the following, but I think the sed 
> append command must be terminated with a newline?
>
>  > in-target sed -i '/<!-- Volume definitions -->/ {
>  >     n
>  >     a <volume fstype="cifs" mountpoint="~/earth" 
> path="students/%(USER)" pgrp="users" server="earth.lan" />
>  >   }' etc/security/pam_mount.conf.xml
>
> Is there any way to express this script ^ without newline characters? Is 
> there any way to embed newline characters in preseed/late_command
> value?

You may be able to do:

  in-target sed -i "$(echo '/<!-- Volume definitions -->/ {\nn\na <volume fstype="cifs" mountpoint="~/earth" path="students/%(USER)" pgrp="users" server="earth.lan" />\n}')" etc/security/pam_mount.conf.xml

also, I don't see why you need to run this in the target chroot, so you
can probably avoid some quoting problems with something like:

  sed -i "$(echo '/<!-- Volume definitions -->/ {\nn\na <volume fstype="cifs" mountpoint="~/earth" path="students/%(USER)" pgrp="users" server="earth.lan" />\n}')" /target/etc/security/pam_mount.conf.xml

or, even, just as you'd normally do it, with the embedded newlines
(which you were presumably avoiding because of the in-target, which you
don't need as it turns out)

Cheers, Phil.
-- 
|)|  Philip Hands [+44 (0)20 8530 9560]    http://www.hands.com/
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