Move 'with-atomic-file-output' to (guix utils).

* guix/scripts/substitute-binary.scm (with-atomic-file-output): Move to...
* guix/utils.scm (with-atomic-file-output): ... here.

.dir-locals.el

@@ -20,6 +20,7 @@
    (eval . (put 'substitute-keyword-arguments 'scheme-indent-function 1))
    (eval . (put 'with-error-handling 'scheme-indent-function 0))
    (eval . (put 'with-mutex 'scheme-indent-function 1))
+   (eval . (put 'with-atomic-file-output 'scheme-indent-function 1))
 
    (eval . (put 'syntax-parameterize 'scheme-indent-function 1))
    (eval . (put 'with-monad 'scheme-indent-function 1))

guix/scripts/substitute-binary.scm

@@ -72,21 +72,6 @@ (define %narinfo-expired-cache-entry-removal-delay
   ;; How often we want to remove files corresponding to expired cache entries.
   (* 7 24 3600))
 
-(define (with-atomic-file-output file proc)
-  "Call PROC with an output port for the file that is going to replace FILE.
-Upon success, FILE is atomically replaced by what has been written to the
-output port, and PROC's result is returned."
-  (let* ((template (string-append file ".XXXXXX"))
-         (out      (mkstemp! template)))
-    (with-throw-handler #t
-      (lambda ()
-        (let ((result (proc out)))
-          (close out)
-          (rename-file template file)
-          result))
-      (lambda (key . args)
-        (false-if-exception (delete-file template))))))
-
 ;; In Guile 2.0.9, `regexp-exec' is thread-unsafe, so work around it.
 ;; See <http://bugs.gnu.org/14404>.
 (set! regexp-exec
@@ -594,7 +579,6 @@ (define (guix-substitute-binary . args)
 
 
 ;;; Local Variables:
-;;; eval: (put 'with-atomic-file-output 'scheme-indent-function 1)
 ;;; eval: (put 'with-timeout 'scheme-indent-function 1)
 ;;; End:
 

guix/utils.scm

@@ -67,6 +67,7 @@ (define-module (guix utils)
             file-extension
             file-sans-extension
             call-with-temporary-output-file
+            with-atomic-file-output
             fold2
             filtered-port))
 
@@ -426,6 +427,21 @@ (define (call-with-temporary-output-file proc)
         (false-if-exception (close out))
         (false-if-exception (delete-file template))))))
 
+(define (with-atomic-file-output file proc)
+  "Call PROC with an output port for the file that is going to replace FILE.
+Upon success, FILE is atomically replaced by what has been written to the
+output port, and PROC's result is returned."
+  (let* ((template (string-append file ".XXXXXX"))
+         (out      (mkstemp! template)))
+    (with-throw-handler #t
+      (lambda ()
+        (let ((result (proc out)))
+          (close out)
+          (rename-file template file)
+          result))
+      (lambda (key . args)
+        (false-if-exception (delete-file template))))))
+
 (define fold2
   (case-lambda
     ((proc seed1 seed2 lst)