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authorLudovic Courtès <ludo@gnu.org>2023-09-15 15:16:04 +0200
committerLudovic Courtès <ludo@gnu.org>2023-10-01 22:58:19 +0200
commitaa40b085dc36721c00eb7fcde69c70c5d9284c1c (patch)
tree43268a6b89b5c11092040a39d92fee2be97cb4ea /doc
parent21deb89e287b5821975544118bf137562a91d4e1 (diff)
services: guix: Support declarative offloading setup.
* gnu/services/base.scm (guix-machines-files-installation): New procedure. (<guix-configuration>)[build-machines]: New field. (guix-activation): Call ‘ guix-machines-files-installation’. (<guix-extension>)[build-machines]: New field. (guix-extension-merge): Handle it. (guix-service-type)[extend]: Likewise. * doc/guix.texi (Daemon Offload Setup): Add note linking to ‘guix-configuration’. (Base Services): Document ‘build-machines’ field of <guix-configuration> and of <guix-extension>. (Virtualization Services): Add ‘hurd-vm’ anchor.
Diffstat (limited to 'doc')
-rw-r--r--doc/guix.texi42
1 files changed, 41 insertions, 1 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index f49ed894a7..103f6b4c64 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -1485,6 +1485,14 @@ name, and they will be scheduled on matching build machines.
@end table
@end deftp
+@quotation Note
+On Guix System, instead of managing @file{/etc/guix/machines.scm}
+independently, you can choose to specify build machines directly in the
+@code{operating-system} declaration, in the @code{build-machines} field
+of @code{guix-configuration}. @xref{guix-configuration-build-machines,
+@code{build-machines} field of @code{guix-configuration}}.
+@end quotation
+
The @command{guix} command must be in the search path on the build
machines. You can check whether this is the case by running:
@@ -19263,6 +19271,28 @@ The type of compression used for build logs---one of @code{gzip},
Whether to discover substitute servers on the local network using mDNS
and DNS-SD.
+@anchor{guix-configuration-build-machines}
+@item @code{build-machines} (default: @code{#f})
+This field must be either @code{#f} or a list of gexps evaluating to a
+@code{build-machine} record (@pxref{Daemon Offload Setup}).
+
+When it is @code{#f}, the @file{/etc/guix/machines.scm} file is left
+untouched. Otherwise, the list of of gexps is written to
+@file{/etc/guix/machines.scm}; if a previously-existing file is found,
+it is backed up as @file{/etc/guix/machines.scm.bak}. This allows you
+to declare build machines for offloading directly in the operating
+system declaration, like so:
+
+@lisp
+(guix-configuration
+ (build-machines
+ (list #~(build-machine (name "foo.example.org") @dots{})
+ #~(build-machine (name "bar.example.org") @dots{}))))
+@end lisp
+
+Additional build machines may be added @i{via} the @code{guix-extension}
+mechanism (see below).
+
@item @code{extra-options} (default: @code{'()})
List of extra command-line options for @command{guix-daemon}.
@@ -19300,7 +19330,6 @@ Environment variables to be set before starting the daemon, as a list of
@end deftp
@deftp {Data Type} guix-extension
-
This data type represents the parameters of the Guix build daemon that
are extendable. This is the type of the object that must be used within
a guix service extension.
@@ -19313,6 +19342,16 @@ A list of file-like objects where each element contains a public key.
@item @code{substitute-urls} (default: @code{'()})
A list of strings where each element is a substitute URL.
+@item @code{build-machines} (default: @code{'()})
+A list of gexps that evaluate to @code{build-machine} records
+(@pxref{Daemon Offload Setup}).
+
+Using this field, a service may add new build machines to receive builds
+offloaded by the daemon. This is useful for a service such as
+@code{hurd-vm-service-type}, which can make a GNU/Hurd virtual machine
+directly usable for offloading (@pxref{hurd-vm,
+@code{hurd-vm-service-type}}).
+
@item @code{chroot-directories} (default: @code{'()})
A list of file-like objects or strings pointing to additional directories the build daemon can use.
@end table
@@ -35654,6 +35693,7 @@ host. If empty, QEMU uses a default file name.
@end deftp
+@anchor{hurd-vm}
@subsubheading The Hurd in a Virtual Machine
@cindex @code{hurd}