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-rw-r--r--doc/guix.texi6
-rw-r--r--nix/nix-daemon/guix-daemon.cc42
2 files changed, 42 insertions, 6 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 94998f170f..b7005f0ef1 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -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
diff --git a/nix/nix-daemon/guix-daemon.cc b/nix/nix-daemon/guix-daemon.cc
index 36a06a3fae..d7ab9c5e64 100644
--- a/nix/nix-daemon/guix-daemon.cc
+++ b/nix/nix-daemon/guix-daemon.cc
@@ -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)