Date: Wed, 19 Jan 2005 10:21:37 +0100
From: Jan Hudec <bulb@ucw.cz>
To: Juraj Kubelka <Juraj.Kubelka@email.cz>
Subject: Re: [Gnu-arch-users] Keyword substitution,
	How can I automatically add version to file?
Message-ID: <20050119092137.GB6310@vagabond>
References: <20050118203950.GA14564@cesta>
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On Tue, Jan 18, 2005 at 21:39:50 +0100, Juraj Kubelka wrote:
> Hi!
>=20
> I need add something like $Id$ from CVS to file and automatically
> update it before commit to new version.

That's not possible. It is too complicated to handle this in mergeing to
be worth the trouble. Especialy since tla relies on external diff/patch,
that can't easily be given special hooks.

> I read it is not possible with GNU Arch (tla). Do you think I can use
> hook file? But how? When `$1 =3D=3D commit' it is too late for updating
> and when `$1 =3D=3D precommit' it hasn't any effect. It is added to file
> but not committed. Also I have to execute `touch file' and then `tla
> changes --diffs' shows me not added difference (line).

You do NOT want to commit that information! That would produce bogus
conflicts!

> Do you have better idea? I need it because of tagging builds (binary
> files). I need to know relation between binaries in sources and it
> isn't good depend on human factor.

There are two options. Either you can have a precious (ie. not commited
but always preserved) file, that will be updated in hooks after replay,
update, star-merge and get. Unfortunately I am not sure the hooks are
there (and I fear they are not). However, if you use build-config, it
creates a file called =3DRELEASE-ID with precisely this information.

There is another possibility, that I'd consider best. In fact I have
already used that several times. Just find that information dynamicaly
during build!

I will assume that you want to set the information in configure script,
so shell assignment is the right way. If it's something else, modify
appropriately. Basicaly the trick is to call:

VERSION=3D`tla logs -f -r | head -1`

(you can of course add decorations...:
VERSION=3D"arch-version: `tla logs -f -r | head -1`"
)

If you wanted to do this from make instead, you would write:
VERSION=3D"-DVERSION=3D\"`tla logs -f -r | head -1`\""

and then just expand $(VERSION) on the build command.

If you want to keep the version after the arch information is stripped
(like for a release), than just make a script or build target, that
creates this version, that will write the information is some file
during the process.

> Can this tag line cause any branch merging problem? When every release
> in every branch has unique this line in file? I talk about line like:

Sure. It will always cause a conflict. Which is a reason why it was not
implemented. The workarounds mentioned above were good enough for
everybody so far so that nobody cared enough to define and implement
keyword substitution.

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						 Jan 'Bulb' Hudec <bulb@ucw.cz>

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