[augeas-devel] Calling augtool from a script

[Raphaël Pinson]

On Wed, Apr 24, 2013 at 2:56 PM, Graham Leggett <minfrin at sharp.fm> wrote:

> On 24 Apr 2013, at 4:20 AM, Ian Mortimer <i.mortimer at uq.edu.au> wrote:
>
> > Here's a very simple example from a centos kickstart %post:
> >
> > augtool -s <<-EOF
> > set /files/etc/pam.d/system-auth-ac/*[module =
> 'pam_mkhomedir.so']/argument[1] umask=0077
> > set /files/etc/pam.d/password-auth-ac/*[module =
> 'pam_mkhomedir.so']/argument[1] umask=0077
> > rm /files/etc/ntp.conf/server[. =~ regexp('.*\.centos\.pool\.ntp\.org')]
> > EOF
>
> Extending the above, I tried the following:
>
> augtool -s <<-EOF
>

-s calls save. You don't really need it here since you're calling save
manually.


> set /files/etc/fstab/1[file='/home/monica/minfrin']/spec
> "/dev/vg001/home-monica-minfrin2"
>

This line doesn't really make sense: you're selecting the first entry, but
only if its file value is "/home/monica/minfin". I guess you want:

    set /files/etc/fstab/*[file='/home/monica/minfrin']/spec
"/dev/vg001/home-monica-minfrin2"

which will update whichever entry matches the condition (not only if it's
the first one). If you want only the first entry matching the condition,
then use:

    set /files/etc/fstab/*[file='/home/monica/minfrin'][1]/spec
"/dev/vg001/home-monica-minfrin2"



> save
> print /augeas//error
> EOF
>
> What I expected was for the existing line to be updated, and the result
> saved. What I get instead is this:
>
> + augtool -s
> error: Failed to execute command
> error: saving failed (run 'print /augeas//error' for details)
> /augeas/files/etc/fstab/error = "put_failed"
> /augeas/files/etc/fstab/error/path = "/files/etc/fstab/1"
> /augeas/files/etc/fstab/error/lens =
> "/usr/share/augeas/lenses/dist/fstab.aug:23.17-30.22:"
> /augeas/files/etc/fstab/error/message = "Failed to match \n    { /spec/ =
> /[^\\001-\\004\\t\\n #,][^\\001-\\004\\t\\n ]*/ }{ /file/ =
> /[^\\001-\\004\\t\\n #,]+/ }{ /vfstype/ = /[^\\001-\\004\\t\\n #,=]+/ }({
> /vfstype/ = /[^\\001-\\004\\t\\n #,=]+/ })*{ /opt/ = /[^\\001-\\004\\t\\n
> #,=]+/ }({ /opt/ = /[^\\001-\\004\\t\\n #,=]+/ })*({ /dump/ = /[0-9]+/ }({
> /passno/ = /[0-9]+/ })?)?\n  with tree\n    { \"spec\" =
> \"/dev/vg001/home-monica-minfrin2\" }"
>
>
The entry didn't exist at all (or was not the first entry, as mentioned
above), so your "set" command created a "spec" node in the tree, without
the other mandatory sibling nodes for a valid fstab entry. When trying to
save the new tree to the file, it failed because the tree was not valid.


Regards,

-- 
Raphaël Pinson
Développeur et Formateur Infrastructure
+33 479 926 57 93

Camptocamp France
Savoie Technolac
BP 352
48, avenue du Lac du Bourget
73372 Le Bourget du Lac, Cedex
www.camptocamp.com
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