[augeas-devel] Augeas to parse informational files from install CDs?

[Owen Mann]

David Lutterkort wrote:
> Hi Rich,
>
> On Mon, 2011-01-17 at 18:10 +0000, Richard W.M. Jones wrote:
>> These files are not in a fixed location, but found relative to the
>> mountpoint of the CD.
>
> That means you'll have to set up where to read the files by
> manipulating /augeas/load and then issuing an aug_load[1]
>
>> Assuming it is in scope, then here are some examples:
>>
>> (1) From Fedora DVD:
>>
>> Two files of interest, '/.discinfo' and '/.treeinfo', examples
>> attached.  There are many interesting fields, but particularly we'd
>> like to read the OS name, version, architecture and disk number.
>
> I am attaching the lens for .discinfo; .treeinfo seems to be a INI-file.
> I'll try and cobble sth together from the IniFile module tomorrow
> (unless somebody beats me to it).
>
> Basically, entries will go to .treeinfo/$section/$key except for the
> stuff in the 'checksums' section since the keys there contain slashes.
> That section will need to be treated special.
>
>> (2) From Windows XP - 2003 install CDs:
>>
>> We parse a file called '/i386/txtsetup.sif' ('/amd64/txtsetup.sif' on
>> x86-64).  These huge text files contain several interesting fields
>> describing the CD including:
>
> What a beauty. This should also be tractable with a fairly generic INI
> lens.
>
> David
>
> [1] http://augeas.net/page/Loading_specific_files
>
>
>
>
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Oddly, I was just working on this recently, but got stuck.
Using Augeas to modify this file, combined with the new template-able tftpd.py in Cobbler, has the potential to make a killer
Windows deployment system (if there is such a thing).

Starting from the IniFile lens, I had to change some things to be compatible with this file, including:

- DOS-format CRLF's
- some LHS settings are quoted, with spaces. Either side may have underscores or percents.

The part that stumped me is the [Files.DeleteOnUpgrade] sections:

[Files.DeleteOnUpgrade]
msilrai.dll   , 2
1394vdbg.inf  , 20
1394vdbg.sys  , 4
15_16wdm.sys  , 4
[...]

I haven't been able to figure out a lens/regexp/whatever to just add these lines as-is (i.e. no values). Anybody have some advice?
Here's what I've got so far (I haven't tackled CRLF's yet):

----8<------------------------------------------------------------------
module Txtsetup =
   autoload xfm

let comment    = Util.comment_generic /[ \t]*;[ \t]*/ "; "
let sep        = IniFile.sep "=" "="
let sto_to_comment_re =  /[^; \t\n][^;\n]*[^; \t\n]|[^; \t\n]/
let sto_to_comment = Util.del_opt_ws "" . store (sto_to_comment_re | /"/ . sto_to_comment_re . /"/)

let entry_re = ( /[A-Za-z0-9\._%,-]+/ )
let dqentry_re = /"[ A-Za-z#0-9\._-]+"/
let entry_uq      = [ key entry_re . sep . sto_to_comment? . (comment|Util.eol) ]
let entry_dq      = [ key dqentry_re . sep . sto_to_comment? . (comment|Util.eol) ]
let entry         = Util.empty | entry_uq | entry_dq | comment

let title   = Util.del_str "[" . key IniFile.record_re . Util.del_str "]" . Util.eol

let record  = IniFile.record_noempty title entry

let lns     = IniFile.lns record comment

let filter = (incl "/tftpboot/w2k3SESP2-32/i386/aug/*")
let xfm = transform lns filter
----8<------------------------------------------------------------------

I've tried adding a third "entry" type:
let entry_new     = [ key entry_re . (comment|Util.eol) ]

but it complains that this overlaps with the entry_uq lens.
I've tinkered like crazy, but I can't figure out how to make this lens unique. Basically I want it to match a
non-{empty,entry_uq,entry_dq,comment} line without an '='. What am I missing?

Any help appreciated!

-Owen Mann