services: ganeti: Add support for cluster hooks.

* gnu/services/ganeti.scm (<ganeti-configuration>): Add HOOKS.
(hooks->directory): Rename to ...
(debootstrap-hooks->directory): ... this, for clarity.
(debootstrap-configuration-compiler): Adjust accordingly.
(ganeti-directory): Add HOOKS when set.
(ganeti-etc-service): Pass HOOKS.
* doc/guix.texi (Virtualization Services): Mention it.

2 files changed, 14 insertions, 4 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 5cb5ae1dfe..eb37d4d393 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -34249,6 +34249,10 @@ To override a setting, you must use the configuration type for that service:
 @item @code{file-storage-paths} (default: @code{'()})
 List of allowed directories for file storage backend.
 
+@item @code{hooks} (default: @code{#f})
+When set, this should be a file-like object containing a directory with
+@url{https://docs.ganeti.org/docs/ganeti/3.0/html/hooks.html,cluster execution hooks}.
+
 @item @code{os} (default: @code{%default-ganeti-os})
 List of @code{<ganeti-os>} records.
 @end table
diff --git a/gnu/services/ganeti.scm b/gnu/services/ganeti.scm
index d9770b1a29..f8127e8721 100644
--- a/gnu/services/ganeti.scm
+++ b/gnu/services/ganeti.scm
@@ -777,6 +777,8 @@ than 21 days from @file{/var/lib/ganeti/queue/archive}.")))
                           (default (ganeti-cleaner-configuration)))
   (file-storage-paths     ganeti-configuration-file-storage-paths ;list of strings | gexp
                           (default '()))
+  (hooks                  ganeti-configuration-hooks  ;<file-like> | #f
+                          (default #f))
   (os                     ganeti-configuration-os  ;list of <ganeti-os>
                           (default '())))
 
@@ -910,7 +912,7 @@ trap - EXIT
   (partition-alignment debootstrap-configuration-partition-alignment ;#f | integer
                        (default 2048)))
 
-(define (hooks->directory hooks)
+(define (debootstrap-hooks->directory hooks)
   (match hooks
     ((? file-like?)
      hooks)
@@ -918,7 +920,7 @@ trap - EXIT
      (let ((names (map car hooks))
            (files (map cdr hooks)))
        (with-imported-modules '((guix build utils))
-         (computed-file "hooks-union"
+         (computed-file "debootstrap-hooks"
                         #~(begin
                             (use-modules (guix build utils)
                                          (ice-9 match))
@@ -942,7 +944,7 @@ trap - EXIT
     (($ <debootstrap-configuration> hooks proxy mirror arch suite extra-pkgs
                                     components generate-cache? clean-cache
                                     partition-style partition-alignment)
-     (let ((customize-dir (hooks->directory hooks)))
+     (let ((customize-dir (debootstrap-hooks->directory hooks)))
        (gexp->derivation
         "debootstrap-variant"
         #~(call-with-output-file (ungexp output "out")
@@ -1034,7 +1036,7 @@ in /etc/ganeti/instance-$os for OS."
     (computed-file (string-append name "-os") builder
                    #:local-build? #t)))
 
-(define (ganeti-directory file-storage-file os)
+(define (ganeti-directory file-storage-file hooks os)
   (let ((dirs (map ganeti-os->directory os))
         (names (map ganeti-os-name os)))
     (define builder
@@ -1044,6 +1046,9 @@ in /etc/ganeti/instance-$os for OS."
           (when #$file-storage-file
             (symlink #$file-storage-file
                      (string-append #$output "/file-storage-paths")))
+          (when #$hooks
+            (symlink #$hooks
+                     (string-append #$output "/hooks")))
           (for-each (match-lambda
                       ((name dest)
                        (symlink dest
@@ -1063,6 +1068,7 @@ in /etc/ganeti/instance-$os for OS."
   (list `("ganeti" ,(ganeti-directory
                      (file-storage-file
                       (ganeti-configuration-file-storage-paths config))
+                     (ganeti-configuration-hooks config)
                      (ganeti-configuration-os config)))))
 
 (define (debootstrap-os variants)