From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Marusich Subject: Re: (Exposing?) config files and non-start/stop operations Date: Sun, 20 Nov 2016 20:54:35 -0800 Message-ID: <87polpo2k4.fsf@gmail.com> References: <87a8cuaszg.fsf@dustycloud.org> <878tsdbx2d.fsf@dustycloud.org> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha256; protocol="application/pgp-signature" Return-path: Received: from eggs.gnu.org ([2001:4830:134:3::10]:34231) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c8gct-0005Mf-I3 for guix-devel@gnu.org; Sun, 20 Nov 2016 23:54:44 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1c8gcs-0000ke-Nb for guix-devel@gnu.org; Sun, 20 Nov 2016 23:54:43 -0500 Received: from mail-pg0-x22e.google.com ([2607:f8b0:400e:c05::22e]:32768) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1c8gcs-0000jL-DJ for guix-devel@gnu.org; Sun, 20 Nov 2016 23:54:42 -0500 Received: by mail-pg0-x22e.google.com with SMTP id 3so126405020pgd.0 for ; Sun, 20 Nov 2016 20:54:41 -0800 (PST) In-Reply-To: <878tsdbx2d.fsf@dustycloud.org> (Christopher Allan Webber's message of "Sun, 20 Nov 2016 16:34:02 -0600") List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org Sender: "Guix-devel" To: Christopher Allan Webber Cc: guix-devel@gnu.org --=-=-= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Christopher Allan Webber writes: > Christopher Allan Webber writes: > >> Hello, >> >> I'm writing a service for dirvish, and I realized that if I'm following >> current guix service routes, I might not be able to run all the >> operations I need to.=20=20 Why not? I read the rest of your email but this wasn't clear to me. >> It seems that the current route for Guix is to have your service >> write out a config that more or less becomes part of the environment >> for starting / stopping a daemon via Shepherd. But what if that's >> not all you need to do? >> >> Aside from just "running as a daemon", plenty of (especially >> applications which manage state) will need to have other commands that >> are unlikely to be run from shepherd. For example: >> >> - Initializing a data store. For example, in dirvish I need to run >> a command to initialize a "vault" where I will be storing my data. >> - Manually invoking a garbage collection utility. >> - Manually invoking an integrity check utility. >> - Possibly some side effect involving querying the network. >> - Running schema migrations. >> >> All sorts of things! Most of them (all?) involve state or side effects, >> but plenty of our most important services will be "state overlords" of >> some type. Why do those activities need to be represented as actions in Shepherd? If we're running a daemon or service that already exposes a mechanism for manually running tasks like these, then can't we just use "the usual mechanism" for doing it? For example, if we're running a daemon that already provides a script to perform garbage collection, can't we just invoke that script? It isn't clear to me why we would need to model domain-specific actions like that in Shepherd, although I can see why it might be convenient. Am I missing something? =2D-=20 Chris --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJYMn4LAAoJEN1AmhXYIkadp8MP/3P/TiYftmSBeuXF+pvOsYUm 50h8qP21Pxpv1aWvrKn5jda3zQ65olhGm1uOIL9Jr4opMkuguvqifN22GMTef/xW T9NJHyaeP897v1IdWheM1JdGVmhFM1bYoZGJOMXUvWg7N/+3B/jzCEadB2FER4rd jNnRWfURf40qYr7gXP4jPss5L57FlFUU/gNaZSw6sKvt4XrBb5SxTuNl7YE9e32b Zc6AOz7aaCWftJ41Y1etmt2s6/4GCGxtTjtUrxzCiCHDmkYHFIeLMtISA/2HCYaa dG8htt2KWAiNFgAoVl1OxSW6XNhZ6qyDvlsBA0cePWo7BU/nPNJpeuPeQJ4QxiAY SuWPjM4b8P7RenG96Bp30lH+NI8YgApBhK+jdT73y4BIoYOHR6B80pzbvNTdO9dC DNBr2jottUfbxFhns+R4mjQvwjCfIi+hS5J7jsa/f5xM0jue7ewnSWfN9xTXINVe OmgxrjfdxIduep8P6d/zckDK4wXhETXXj3ntEhVfAd1z4hRerknF8lSnasMVMVPX 59IKjHpsSdJjGXYWzqMaW7blI8XRwBGTpzw+sawm+ZUt358qG7yNvT8VWs5QXz34 oIN4gqyqtJ/QfuONm+ddOjmNMr/lPPdWyN2cqZWIDA+vGCsqnHLHsCgWzTIQKFz/ Zi2ZXm2iKiY5CwNdzXds =/g9G -----END PGP SIGNATURE----- --=-=-=--