install: Use 'reset-timestamps' from (guix store database).

* gnu/build/install.scm (reset-timestamps): Remove.
* gnu/build/vm.scm: Use 'reset-timestamps' from (guix store database).

gnu/build/install.scm

@@ -26,7 +26,6 @@
   #:export (install-boot-config
             evaluate-populate-directive
             populate-root-file-system
-            reset-timestamps
             register-closure
             populate-single-profile-directory))
 
@@ -145,20 +144,6 @@ includes /etc, /var, /run, /bin/sh, etc., and all the symlinks to SYSTEM."
                 (try))
               (apply throw args)))))))
 
-(define (reset-timestamps directory)
-  "Reset the timestamps of all the files under DIRECTORY, so that they appear
-as created and modified at the Epoch."
-  (display "clearing file timestamps...\n")
-  (for-each (lambda (file)
-              (let ((s (lstat file)))
-                ;; XXX: Guile uses libc's 'utime' function (not 'futime'), so
-                ;; the timestamp of symlinks cannot be changed, and there are
-                ;; symlinks here pointing to /gnu/store, which is the host,
-                ;; read-only store.
-                (unless (eq? (stat:type s) 'symlink)
-                  (utime file 0 0 0 0))))
-            (find-files directory #:directories? #t)))
-
 (define* (register-closure prefix closure
                            #:key
                            (deduplicate? #t) (reset-timestamps? #t)

gnu/build/vm.scm

@@ -25,6 +25,7 @@
   #:use-module (guix build utils)
   #:use-module (guix build store-copy)
   #:use-module (guix build syscalls)
+  #:use-module ((guix store database) #:select (reset-timestamps))
   #:use-module (gnu build linux-boot)
   #:use-module (gnu build install)
   #:use-module (gnu system uuid)

guix/store/database.scm

@@ -183,7 +183,6 @@ Every store item in REFERENCES must already be registered."
 ;;; High-level interface.
 ;;;
 
-;; TODO: Factorize with that in (gnu build install).
 (define (reset-timestamps file)
   "Reset the modification time on FILE and on all the files it contains, if
 it's a directory.  While at it, canonicalize file permissions."