[bug#69343] [PATCH v4 04/11] Move epoch->date-string to gnu/system/boot.scm and use it elsewhere.

[Lilah Tascheter via Guix-patches <guix-patches@gnu.org>]

From: Felix Lechner <felix.lechner@lease-up.com>

* guix/scripts/system.scm (profile-boot-parameters): Rename time to
  epoch to fit new procedure name.
  (epoch->date-string): Move to...
* gnu/system/boot.scm (epoch->date-string): ...here.
* gnu/machine/ssh.scm (machine-boot-parameters): Rename time to epoch.
  (machine-boot-parameters)[boot-parameters]: Use epoch->date-string.

Change-Id: I6a5f793567221f81edd7b2d8d9f0f3e801d1b113
---
 gnu/machine/ssh.scm     | 10 ++++------
 gnu/system/boot.scm     |  8 ++++++++
 guix/scripts/system.scm | 10 ++--------
 3 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/gnu/machine/ssh.scm b/gnu/machine/ssh.scm
index 749aa2b6d8..e68e64527e 100644
--- a/gnu/machine/ssh.scm
+++ b/gnu/machine/ssh.scm
@@ -442,10 +442,10 @@ (define (machine-boot-parameters machine)
                                                              generation))
                           (boot-parameters-path (string-append system-path
                                                                "/parameters"))
-                          (time (stat:mtime (lstat system-path))))
+                          (epoch (stat:mtime (lstat system-path))))
                      (list generation
                            system-path
-                           time
+                           epoch
                            (read-file boot-parameters-path))))
                  (reverse (generation-numbers %system-profile)))))))
 
@@ -453,7 +453,7 @@ (define (machine-boot-parameters machine)
     (return
      (map (lambda (generation)
             (match generation
-              ((generation system-path time serialized-params)
+              ((generation system-path epoch serialized-params)
                (let* ((params (call-with-input-string serialized-params
                                 read-boot-parameters))
                       (root (boot-parameters-root-device params))
@@ -464,9 +464,7 @@ (define (machine-boot-parameters machine)
                   (label
                    (string-append label " (#"
                                   (number->string generation) ", "
-                                  (let ((time (make-time time-utc 0 time)))
-                                    (date->string (time-utc->date time)
-                                                  "~Y-~m-~d ~H:~M"))
+                                  (epoch->date-string epoch)
                                   ")"))
                   (kernel-arguments
                    (append (bootable-kernel-arguments system-path root version)
diff --git a/gnu/system/boot.scm b/gnu/system/boot.scm
index df27b8aea4..01e3a965e4 100644
--- a/gnu/system/boot.scm
+++ b/gnu/system/boot.scm
@@ -45,6 +45,7 @@ (define-module (gnu system boot)
   #:use-module (ice-9 format)
   #:use-module (ice-9 match)
   #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-19)
   #:use-module (srfi srfi-34)
   #:use-module (srfi srfi-35)
   #:use-module (rnrs bytevectors)
@@ -70,6 +71,7 @@ (define-module (gnu system boot)
             read-boot-parameters-file
             bootable-kernel-arguments
 
+            epoch->date-string
             boot-parameters->menu-entry
 
             ensure-not-/dev
@@ -296,6 +298,12 @@ (define* (bootable-kernel-arguments system root-device version)
            #~(string-append (if #$version>0? "gnu.load=" "--load=")
                             #$system "/boot")))))
 
+(define (epoch->date-string epoch)
+  "Return a string representing the date for EPOCH seconds."
+  (let ((time (make-time time-utc 0 epoch)))
+    (date->string (time-utc->date time)
+                  "~Y-~m-~d ~H:~M")))
+
 (define (boot-parameters->menu-entry conf)
   "Return a <menu-entry> instance given CONF, a <boot-parameters> instance."
   (let* ((kernel (boot-parameters-kernel conf))
diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
index cb70d36219..b197812e63 100644
--- a/guix/scripts/system.scm
+++ b/guix/scripts/system.scm
@@ -328,19 +328,13 @@ (define-syntax-rule (unless-file-not-found exp)
           #f
           (apply throw args)))))
 
-(define (epoch->date-string epoch)
-  "Return a string representing the date for EPOCH seconds."
-  (let ((time (make-time time-utc 0 epoch)))
-    (date->string (time-utc->date time)
-                  "~Y-~m-~d ~H:~M")))
-
 (define* (profile-boot-parameters #:optional (profile %system-profile)
                                   (numbers
                                    (reverse (generation-numbers profile))))
   "Return a list of 'boot-parameters' for the generations of PROFILE specified
 by NUMBERS, which is a list of generation numbers. The list is ordered from
 the most recent to the oldest profiles."
-  (define (system->boot-parameters system number time)
+  (define (system->boot-parameters system number epoch)
     (unless-file-not-found
      (let* ((params           (read-boot-parameters-file system))
             (label            (boot-parameters-label params)))
@@ -348,7 +342,7 @@ (define* (profile-boot-parameters #:optional (profile %system-profile)
          (inherit params)
          (label (string-append label " (#"
                                (number->string number) ", "
-                               (epoch->date-string time) ")"))))))
+                               (epoch->date-string epoch) ")"))))))
   (let* ((systems (map (cut generation-file-name profile <>)
                        numbers))
          (times   (map (lambda (system)
-- 
2.45.2