On Tue, 2008-12-16 at 09:52 +0100, Thomas Bellman wrote:
> 1. Is it possible to specify what lens to use for editing a
> certain file? Can I for instance tell it to use the sshd lens
> to edit an sshd config file in a non-standard place?
Add the directory with your custom lens to the load_path; augeas will
then load that lens instead of the default one.
> Or to
> use the shellvars lens to edit /etc/sysconfig/sendmail (the
> version of Augeas in Fedora 9 happily edits lots of other
> files in /etc/sysconfig, but not the sendmail file). Do I
> have to write a new lens for this?
That was an oversight; I just comitted a fix to add that file in
shellvars.aug.
For now, you can work around that by adding a module like
module Sendmail
autoload xfm
let xfm = transform Shellvars.lns (incl "/etc/sysconfig/sendmail")
> 2. How do I modify an entry in the tree, as opposed to rewrite it
> with a fixed string? For example, the grub.conf file has
> lines saying
>
> kernel /vmlinuz-2.6.27.5-41.fc9.x86_64 ro root=/dev/sda2 rhgb quiet
>
> and I want to remove the words "rhgb" and "quiet". Just doing
>
> set /files/etc/grub.conf/title[1]/kernel
> "/vmlinuz-2.6.27.5-41.fc9.x86_64 ro root=/dev/sda2"
>
> is the wrong answer, because I might not know what "/dev/sda2"
> should be on every system, and I certainly do not know what
> the version of the kernel should be.
>
> You might think that I could use the $kernelrelease fact, but
> the kernel line I want to modify might not be for the kernel
> that is actually running.
Yeah, that is a problem. It's not quite a solution, but to allow such
operations we'd need to change the grub lens to split the kernel line
into individual arguments, so that you get something like
/files/etc/grub.conf/title[1]/kernel = "/vmlinuz-2.6.27.5-41.fc9.x86_64"
/files/etc/grub.conf/title[1]/kernel/arg = "ro"
/files/etc/grub.conf/title[1]/kernel/arg = "root=/dev/sda2"
/files/etc/grub.conf/title[1]/kernel/arg = "rhgb"
/files/etc/grub.conf/title[1]/kernel/arg = "quiet"
Right now, you're still stuck even with that - I am working on extending
the query language so that you could remove the "rhgb" arg with
something like
rm /files/etc/grub.conf/title/kernel[value() =
"/vmlinuz-2.6.27.5-41.fc9.x86_64"]/arg[value() = "rhgb"]
and do the same for all kernels with
rm /files/etc/grub.conf/title/kernel/arg[value() = "rhgb"]
but unfortunately, that isn't quite finished yet.
> 4. In the /etc/logrotate.conf file in Fedora and CentOS, there is
> an entry on the form:
>
> /var/log/wtmp {
> monthly
> create 0664 root utmp
> rotate 1
> }
>
> I want to comment out, or remove entirely, that entry. I can
> find it with
>
> match /files/etc/logrotate.conf/*/file "/var/log/wtmp"
>
> which right now happens to give me
>
> /files/etc/logrotate.conf/rule[1]/file
>
> After finding that information, I want to do
>
> rm /files/etc/logrotate.conf/rule[1]
>
> but how do I feed the information from the match back to the
> rm command?
That will also require the XPath extension I am working on, so that you
can say
rm /files/etc/logrotate.conf/rule[file = "/var/log/wtmp"]
David
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