lint: Separate checkers by dependence on the internet.

I think there are a couple of potential uses for this. It's somewhat a
separation in to what checkers are just checking the contents of the
repository (line length for example), and other checkers which are bringing in
external information which could change.

I'm thinking particularly, about treating network dependent checkers
differently when automatically running them, but this commit also adds a
--no-network flag to guix lint, which selects the checkers that don't access
the network, which could be useful if no network access is available.

* guix/lint.scm (%checkers): Rename to %all-checkers.
(%local-checkers, %network-dependent-checkers): New variables.
* guix/scripts/lint.scm (run-checkers): Make the checkers argument mandatory.
(list-checkers-and-exit): Handle the checkers as an argument.
(%options): Adjust for changes to %checkers, add a --no-network option, and
change how the --list-checkers option is handled.
(guix-lint): Adjust indentation, and update how the checkers are handled.

2 files changed, 66 insertions, 46 deletions

diff --git a/guix/lint.scm b/guix/lint.scm
index c2c0914958..2542a81a2d 100644
--- a/guix/lint.scm
+++ b/guix/lint.scm
@@ -91,7 +91,9 @@
             lint-warning-message-data
             lint-warning-location
 
-            %checkers
+            %local-checkers
+            %network-dependent-checkers
+            %all-checkers
 
             lint-checker
             lint-checker?
@@ -1146,17 +1148,13 @@ them for PACKAGE."
 ;;; List of checkers.
 ;;;
 
-(define %checkers
+(define %local-checkers
   (list
    (lint-checker
      (name        'description)
      (description "Validate package descriptions")
      (check       check-description-style))
    (lint-checker
-     (name        'gnu-description)
-     (description "Validate synopsis & description of GNU packages")
-     (check       check-gnu-synopsis+description))
-   (lint-checker
      (name        'inputs-should-be-native)
      (description "Identify inputs that should be native inputs")
      (check       check-inputs-should-be-native))
@@ -1165,14 +1163,6 @@ them for PACKAGE."
      (description "Identify inputs that shouldn't be inputs at all")
      (check       check-inputs-should-not-be-an-input-at-all))
    (lint-checker
-     (name        'patch-file-names)
-     (description "Validate file names and availability of patches")
-     (check       check-patch-file-names))
-   (lint-checker
-     (name        'home-page)
-     (description "Validate home-page URLs")
-     (check       check-home-page))
-   (lint-checker
      (name        'license)
      ;; TRANSLATORS: <license> is the name of a data type and must not be
      ;; translated.
@@ -1180,18 +1170,10 @@ them for PACKAGE."
 or a list thereof")
      (check       check-license))
    (lint-checker
-     (name        'source)
-     (description "Validate source URLs")
-     (check       check-source))
-   (lint-checker
      (name        'mirror-url)
      (description "Suggest 'mirror://' URLs")
      (check       check-mirror-url))
    (lint-checker
-     (name        'github-url)
-     (description "Suggest GitHub URLs")
-     (check       check-github-url))
-   (lint-checker
      (name        'source-file-name)
      (description "Validate file names of sources")
      (check       check-source-file-name))
@@ -1204,10 +1186,37 @@ or a list thereof")
      (description "Report failure to compile a package to a derivation")
      (check       check-derivation))
    (lint-checker
+    (name        'patch-file-names)
+    (description "Validate file names and availability of patches")
+    (check       check-patch-file-names))
+   (lint-checker
+     (name        'formatting)
+     (description "Look for formatting issues in the source")
+     (check       check-formatting))))
+
+(define %network-dependent-checkers
+  (list
+   (lint-checker
      (name        'synopsis)
      (description "Validate package synopses")
      (check       check-synopsis-style))
    (lint-checker
+     (name        'gnu-description)
+     (description "Validate synopsis & description of GNU packages")
+     (check       check-gnu-synopsis+description))
+   (lint-checker
+     (name        'home-page)
+     (description "Validate home-page URLs")
+     (check       check-home-page))
+   (lint-checker
+     (name        'source)
+     (description "Validate source URLs")
+     (check       check-source))
+   (lint-checker
+     (name        'github-url)
+     (description "Suggest GitHub URLs")
+     (check       check-github-url))
+   (lint-checker
      (name        'cve)
      (description "Check the Common Vulnerabilities and Exposures\
  (CVE) database")
@@ -1215,8 +1224,8 @@ or a list thereof")
    (lint-checker
      (name        'refresh)
      (description "Check the package for new upstream releases")
-     (check       check-for-updates))
-   (lint-checker
-     (name        'formatting)
-     (description "Look for formatting issues in the source")
-     (check       check-formatting))))
+     (check       check-for-updates))))
+
+(define %all-checkers
+  (append %local-checkers
+          %network-dependent-checkers))
diff --git a/guix/scripts/lint.scm b/guix/scripts/lint.scm
index 1c46fba16b..98ee469501 100644
--- a/guix/scripts/lint.scm
+++ b/guix/scripts/lint.scm
@@ -52,7 +52,7 @@
                (lint-warning-message lint-warning))))
    warnings))
 
-(define* (run-checkers package #:optional (checkers %checkers))
+(define (run-checkers package checkers)
   "Run the given CHECKERS on PACKAGE."
   (let ((tty? (isatty? (current-error-port))))
     (for-each (lambda (checker)
@@ -68,14 +68,14 @@
       (format (current-error-port) "\x1b[K")
       (force-output (current-error-port)))))
 
-(define (list-checkers-and-exit)
+(define (list-checkers-and-exit checkers)
   ;; Print information about all available checkers and exit.
   (format #t (G_ "Available checkers:~%"))
   (for-each (lambda (checker)
               (format #t "- ~a: ~a~%"
                       (lint-checker-name checker)
                       (G_ (lint-checker-description checker))))
-            %checkers)
+            checkers)
   (exit 0))
 
 
@@ -111,26 +111,33 @@ run the checkers on all packages.\n"))
   ;;                                  'certainty'.
   (list (option '(#\c "checkers") #t #f
                 (lambda (opt name arg result)
-                  (let ((names (map string->symbol (string-split arg #\,))))
+                  (let ((names (map string->symbol (string-split arg #\,)))
+                        (checker-names (map lint-checker-name %all-checkers)))
                     (for-each (lambda (c)
-                                (unless (memq c
-                                              (map lint-checker-name
-                                                   %checkers))
+                                (unless (memq c checker-names)
                                   (leave (G_ "~a: invalid checker~%") c)))
                               names)
                     (alist-cons 'checkers
                                 (filter (lambda (checker)
                                           (member (lint-checker-name checker)
                                                   names))
-                                        %checkers)
+                                        %all-checkers)
                                 result))))
+        (option '(#\n "no-network") #f #f
+                (lambda (opt name arg result)
+                  (alist-cons 'checkers
+                              %local-checkers
+                              (alist-delete 'checkers
+                                            result))))
         (option '(#\h "help") #f #f
                 (lambda args
                   (show-help)
                   (exit 0)))
         (option '(#\l "list-checkers") #f #f
-                (lambda args
-                   (list-checkers-and-exit)))
+                (lambda (opt name arg result)
+                  (alist-cons 'list?
+                              #t
+                              result)))
         (option '(#\V "version") #f #f
                 (lambda args
                   (show-version-and-exit "guix lint")))))
@@ -148,13 +155,17 @@ run the checkers on all packages.\n"))
 
   (let* ((opts (parse-options))
          (args (filter-map (match-lambda
-                            (('argument . value)
-                             value)
-                            (_ #f))
+                             (('argument . value)
+                              value)
+                             (_ #f))
                            (reverse opts)))
-         (checkers (or (assoc-ref opts 'checkers) %checkers)))
-     (if (null? args)
-          (fold-packages (lambda (p r) (run-checkers p checkers)) '())
-          (for-each (lambda (spec)
-                      (run-checkers (specification->package spec) checkers))
-                    args))))
+         (checkers (or (assoc-ref opts 'checkers) %all-checkers)))
+    (cond
+     ((assoc-ref opts 'list?)
+      (list-checkers-and-exit checkers))
+     ((null? args)
+      (fold-packages (lambda (p r) (run-checkers p checkers)) '()))
+     (else
+      (for-each (lambda (spec)
+                  (run-checkers (specification->package spec) checkers))
+                args)))))