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daemon: Support systemd-style socket activation.

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* nix/nix-daemon/guix-daemon.cc (SD_LISTEN_FDS_START): New macro.
(systemd_activation_sockets): New function.
(main): Use it.  Remove obsolete 'printMsg' call.
* doc/guix.texi (Invoking guix-daemon): Document socket activation.
This commit is contained in:
Ludovic Courtès 2022-04-09 11:02:33 +02:00
parent b9233cb9a8
commit 5f74169e8e
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2 changed files with 42 additions and 6 deletions
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6
doc/guix.texi
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@ -1554,7 +1554,11 @@ is normally run as @code{root} like this:
# guix-daemon --build-users-group=guixbuild
@end example
@noindent
@cindex socket activation, for @command{guix-daemon}
This daemon can also be started following the systemd ``socket
activation'' protocol (@pxref{Service De- and Constructors,
@code{make-systemd-constructor},, shepherd, The GNU Shepherd Manual}).
For details on how to set it up, @pxref{Setting Up the Daemon}.
@cindex chroot

42
nix/nix-daemon/guix-daemon.cc
View file

@ -1,5 +1,5 @@
/* GNU Guix --- Functional package management for GNU
Copyright (C) 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2021 Ludovic Courtès <ludo@gnu.org>
Copyright (C) 2012-2019, 2021-2022 Ludovic Courtès <ludo@gnu.org>
Copyright (C) 2006, 2010, 2012, 2014 Eelco Dolstra <e.dolstra@tudelft.nl>
This file is part of GNU Guix.
@ -434,6 +434,31 @@ listening_sockets (const std::list<std::string> &options)
return result;
}
/* First file descriptor provided at startup using systemd-style socket
activation. */
#define SD_LISTEN_FDS_START 3
/* Return a list of file descriptors of listening sockets provided following
the systemd "socket activation" protocol. Return the empty list if we are
not being socket-activated. */
static std::vector<int>
systemd_activation_sockets ()
{
std::vector<int> result;
if (getEnv ("LISTEN_PID") == std::to_string (getpid ()))
{
unsigned int fdCount;
if (string2Int (getEnv ("LISTEN_FDS"), fdCount))
{
for (unsigned int i = 0; i < fdCount; i++)
result.push_back (SD_LISTEN_FDS_START + i);
}
}
return result;
}
int
main (int argc, char *argv[])
@ -494,7 +519,17 @@ main (int argc, char *argv[])
argp_parse (&argp, argc, argv, 0, 0, 0);
auto sockets = listening_sockets (listen_options);
auto sockets = systemd_activation_sockets ();
if (sockets.empty ())
/* We were not "socket-activated" so open the sockets specified by
LISTEN_OPTIONS. */
sockets = listening_sockets (listen_options);
else
printMsg (lvlInfo,
format (ngettext ("socket-activated with %1% socket",
"socket-activated with %1% sockets",
sockets.size ()))
% sockets.size ());
/* Effect all the changes made via 'settings.set'. */
settings.update ();
@ -531,9 +566,6 @@ using `--build-users-group' is highly recommended\n"));
format ("automatic deduplication set to %1%")
% settings.autoOptimiseStore);
printMsg (lvlDebug,
format ("listening on `%1%'") % settings.nixDaemonSocketFile);
run (sockets);
}
catch (std::exception &e)