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Date: Mon, 21 Dec 2015 17:59:32 +0100
From: Lars Wirzenius <liw@liw.fi>
To: Ben Boeckel <mathstuf@gmail.com>
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Subject: Re: [PATCH] backup: take an inhibitor lock if possible
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On Mon, Dec 21, 2015 at 11:17:06AM -0500, Ben Boeckel wrote:
> On Mon, Dec 21, 2015 at 16:33:18 +0100, Lars Wirzenius wrote:
> > That just indicates to me that you should write a simpler program,
> > perhaps as a wrapper around systemd-inhibit. :)
>=20
> Would this at least be acceptable to include in obnam? obnam-inhibit? It
> seems silly to have everyone rewrite this thing when it is such an
> important behavior.
I'd rather it was a separate, generic utility than something named so
people think it's related to Obnam, sorry. I'd be happy to add
pointers to it to Obnam documentation, and have the Obnam Debian
packaging suggest it.
> > GUI programs such as video players are not generally composable.
> > Command line programs such as Obnam are. That's an important
> > distinction.
>=20
> Sorry, when am I ever going to pipe obnam output to anything other than
> a log file (or less, sed, etc.)? Does obnam even read stdin?
There are other forms of composability than pipes. For example, the
flock(1) utility, which creates a lock file while it runs a command,
and automatically releases it even if it crashes. That's the same
pattern as I suggest for the inhibition utility.
That said, I expect Obnam to start reading from stdin some day. And
produce output to stdout. Both for using in pipelines. Examples:
* Have Obnam read the list of files to back up from stdin, fed by,
say, find(1).
* Have "obnam export-repository" produce a representation of a backup
repository that is independent of the backup storage format, and
"obnam import-repository" read such a representation to create a new
repository. This would be quite useful for repository conversion.
--=20
Schr=F6dinger's backup hypothesis: the condition of any backup is
undefined until a restore is attempted. -- andrewsh
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