Date: Tue, 23 Nov 2004 19:56:19 +0100
From: Jan Hudec <bulb@ucw.cz>
To: Tez Kamihira <tez@kamihira.com>
Subject: Re: [Gnu-arch-users] [Question] how to preserve multiple file's
	atomicity ?
Message-ID: <20041123185619.GA936@vagabond>
References: <20041122.144539.71098295.tez@kamihira.com>
	<878y8uqnco.fsf@flame.org>
	<20041122.175904.104043386.tez@kamihira.com>
Mime-Version: 1.0
In-Reply-To: <20041122.175904.104043386.tez@kamihira.com>
User-Agent: Mutt/1.5.6+20040907i
Cc: gnu-arch-users@gnu.org
Precedence: list
Content-Type: multipart/mixed; boundary="===============1564510194=="
Sender: gnu-arch-users-bounces+migo=homemail.com@gnu.org
Errors-To: gnu-arch-users-bounces+migo=homemail.com@gnu.org
Status: RO
Content-Length: 2092
Lines: 70

--===============1564510194==
Content-Type: multipart/signed; micalg=pgp-sha1;
	protocol="application/pgp-signature"; boundary="ikeVEW9yuYc//A+q"
Content-Disposition: inline


--ikeVEW9yuYc//A+q
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Mon, Nov 22, 2004 at 17:59:04 +0900, Tez Kamihira wrote:
> On Mon, 22 Nov 2004 02:50:15 -0600, Matthew Dempsky <jivera@flame.org> sa=
id:
> >=20
> > Are you asking for something beyond simple atomic commits which arch
> > already natively supports?
> >=20
>=20
> If I'm correct, arch, and any other SCM's transaction is essentially,
> "file appending". Such operation does not interfere any files that
> already exists. But the way I want is "multiple file's atomic modificatio=
n".
> It's not the same.

Have a look at the File::Transaction::Atomic perl module on CPAN
(http://search.cpan.org/~ncleaton/File-Transaction-Atomic-1.00/).

The algorithm used there is sheer madness, but it works for the general
case (well, it requires that it does not matter when the files are
actualy symlinks, because symlinks need to be used in the process).
Simpler ones are possible for special cases.

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

--ikeVEW9yuYc//A+q
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: Digital signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.5 (GNU/Linux)

iD8DBQFBo4fTRel1vVwhjGURAn2YAKDJZKYslRgYAyQSl3UPDKAcermjUQCgvsxI
tEcOGpPBRYsLipMoh+DBmZ8=
=K5FP
-----END PGP SIGNATURE-----

--ikeVEW9yuYc//A+q--


--===============1564510194==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________
Gnu-arch-users mailing list
Gnu-arch-users@gnu.org
http://lists.gnu.org/mailman/listinfo/gnu-arch-users

GNU arch home page:
http://savannah.gnu.org/projects/gnu-arch/
--===============1564510194==--