[bug#71639] [PATCH WIP 4/5] services: backup: Move restic package to restic-configuration

[Richard Sent <richard@freakingpenguin.com>]

* gnu/services/backup.scm (restic-backup-configuration): Add restic field.
(restic-backup-job-program): Add restic package to function signature.
(restic-guix): Ditto.
(restic-guix-wrapper-package): Ditto. Add restic package as package input.
(restic-backup-service-profile): Remove excess lamba.

* doc/guix.texi (Miscellaneous Services): Document it.

Change-Id: I1e5f63c21cd072354225afe0ee270dca8d9d840b
---
 doc/guix.texi           |  6 +++---
 gnu/services/backup.scm | 38 ++++++++++++++++++++------------------
 2 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index 32ce0c86b9..e4379c5e1c 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -41311,6 +41311,9 @@ Miscellaneous Services
 Available @code{restic-backup-configuration} fields are:
 
 @table @asis
+@item @code{restic} (default: @code{restic}) (type: package)
+The restic package to use for all jobs.
+
 @item @code{jobs} (default: @code{'()}) (type: list-of-restic-backup-jobs)
 The list of backup jobs for the current system.
 
@@ -41327,9 +41330,6 @@ Miscellaneous Services
 Available @code{restic-backup-job} fields are:
 
 @table @asis
-@item @code{restic} (default: @code{restic}) (type: package)
-The restic package to be used for the current job.
-
 @item @code{user} (default: @code{"root"}) (type: string)
 The user used for running the current job.
 
diff --git a/gnu/services/backup.scm b/gnu/services/backup.scm
index a6d8404a5a..a59cf08c71 100644
--- a/gnu/services/backup.scm
+++ b/gnu/services/backup.scm
@@ -29,10 +29,10 @@ (define-module (gnu services backup)
   #:use-module (guix modules)
   #:use-module (guix packages)
   #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
   #:export (restic-backup-job
             restic-backup-job?
             restic-backup-job-fields
-            restic-backup-job-restic
             restic-backup-job-user
             restic-backup-job-name
             restic-backup-job-repository
@@ -46,6 +46,7 @@ (define-module (gnu services backup)
 
             restic-backup-configuration
             restic-backup-configuration?
+            restic-backup-configuration-restic
             restic-backup-configuration-fields
             restic-backup-configuration-jobs
 
@@ -71,9 +72,6 @@ (define-maybe/no-serialization string)
 (define-maybe/no-serialization file-like)
 
 (define-configuration/no-serialization restic-backup-job
-  (restic
-   (package restic)
-   "The restic package to be used for the current job.")
   (user
    (string "root")
    "The user used for running the current job.")
@@ -129,11 +127,14 @@ (define list-of-restic-backup-jobs?
   (list-of restic-backup-job?))
 
 (define-configuration/no-serialization restic-backup-configuration
+  (restic
+   (package restic)
+   "The restic package to be used.")
   (jobs
    (list-of-restic-backup-jobs '())
    "The list of backup jobs for the current system."))
 
-(define (restic-backup-job-program config)
+(define (restic-backup-job-program restic-package config)
   (define (maybe-value-or-false maybe)
     (if (maybe-value-set? maybe)
         maybe
@@ -143,7 +144,7 @@ (define (restic-backup-job-program config)
   (verify-restic-backup-job-configuration config)
 
   (let ((restic
-         (file-append (restic-backup-job-restic config) "/bin/restic"))
+         (file-append restic-package "/bin/restic"))
         (repository
          (restic-backup-job-repository config))
         (password-file
@@ -191,7 +192,7 @@ (define (restic-backup-job-program config)
                  #$@extra-flags
                  "backup" #$@files)))))
 
-(define (restic-guix jobs)
+(define (restic-guix restic-package jobs)
   (program-file
    "restic-guix"
    #~(begin
@@ -199,7 +200,7 @@ (define (restic-guix jobs)
                     (srfi srfi-1))
 
        (define names '#$(map restic-backup-job-name jobs))
-       (define programs '#$(map restic-backup-job-program jobs))
+       (define programs '#$(map (cut restic-backup-job-program restic-package <>) jobs))
 
        (define (get-program name)
          (define idx
@@ -242,13 +243,13 @@ (define (restic-backup-job->mcron-job config)
            #$(string-append "restic-guix backup " name)
            #:user #$user)))
 
-(define (restic-guix-wrapper-package jobs)
+(define (restic-guix-wrapper-package restic jobs)
   (let ((extra-packages (append-map restic-backup-job-extra-packages
                                     jobs)))
     (package
       (name "restic-backup-service-wrapper")
       (version "0.0.0")
-      (source (restic-guix restic-package jobs))
+      (source (restic-guix restic jobs))
       (build-system copy-build-system)
       (arguments
        (list #:install-plan #~'(("./" "/bin"))))
@@ -260,16 +261,17 @@ (define (restic-guix-wrapper-package jobs)
 by the @code{restic-backup-service-type}.  It allows for easily interacting
 with Guix configured backup jobs, for example for manually triggering a backup
 without waiting for the scheduled job to run.")
-      (inputs extra-packages)
+      (inputs (cons restic extra-packages))
       (license license:gpl3+))))
 
-(define restic-backup-service-profile
-  (lambda (config)
-    (define jobs (restic-backup-configuration-jobs config))
-    (if (> (length jobs) 0)
-        (list
-         (restic-guix-wrapper-package jobs))
-        '())))
+(define (restic-backup-service-profile config)
+  (let ((jobs (restic-backup-configuration-jobs config))
+        (restic (restic-backup-configuration-restic config)))
+    ;; Even if we provide a wrapper we need to add restic to the profile so
+    ;; the service works in containers and VMs which only see a subset of
+    ;; /gnu/store. https://issues.guix.gnu.org/70553. Ergo pass restic to
+    ;; the wrapper package so it is added as an input.
+    (list (restic-guix-wrapper-package restic jobs))))
 
 (define restic-backup-service-type
   (service-type (name 'restic-backup)
-- 
2.45.1