refresh: Add --target-version option.

* guix/scripts/refresh.scm (%options): Register 'target-version' long version.
(update-specification->update-spec): Add a fallback-version argument.
(options->update-specs): Honor target-version option.
* tests/guix-refresh.sh: Test it.
* doc/guix.texi (Invoking guix refresh): Document it.

Reviewed-by: Ludovic Courtès <ludo@gnu.org>

doc/guix.texi

@@ -14529,6 +14529,26 @@ gnu/packages/guile.scm:147:2: guile: updating from version 2.0.10 to version 2.0
 @dots{}
 @end example
 
+In some specific cases, you may have many packages specified via a
+manifest or a module selection which should all be updated together; for
+these cases, the @option{--target-version} option can be provided to have
+them all refreshed to the same version, as shown in the examples below:
+
+@example
+$ guix refresh qtbase qtdeclarative --target-version=6.5.2
+gnu/packages/qt.scm:1248:13: qtdeclarative would be upgraded from 6.3.2 to 6.5.2
+gnu/packages/qt.scm:584:2: qtbase would be upgraded from 6.3.2 to 6.5.2
+@end example
+
+@example
+$ guix refresh --manifest=qt5-manifest.scm --target-version=5.15.10
+gnu/packages/qt.scm:1173:13: qtxmlpatterns would be upgraded from 5.15.8 to 5.15.10
+gnu/packages/qt.scm:1202:13: qtdeclarative would be upgraded from 5.15.8 to 5.15.10
+gnu/packages/qt.scm:1762:13: qtserialbus would be upgraded from 5.15.8 to 5.15.10
+gnu/packages/qt.scm:2070:13: qtquickcontrols2 would be upgraded from 5.15.8 to 5.15.10
+@dots{}
+@end example
+
 Sometimes the upstream name differs from the package name used in Guix,
 and @command{guix refresh} needs a little help.  Most updaters honor the
 @code{upstream-name} property in package definitions, which can be used

guix/scripts/refresh.scm

@@ -10,6 +10,7 @@
 ;;; Copyright © 2020 Simon Tournier <zimon.toutoune@gmail.com>
 ;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
 ;;; Copyright © 2022 Hartmut Goebel <h.goebel@crazy-compilers.com>
+;;; Copyright © 2023 Maxim Cournoyer maxim.cournoyer@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -106,6 +107,9 @@ (define %options
         (option '(#\m "manifest") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'manifest arg result)))
+        (option '("target-version") #t #f
+                (lambda (opt name arg result)
+                  (alist-cons 'target-version arg result)))
         (option '(#\e "expression") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'expression arg result)))
@@ -164,6 +168,9 @@ (define (show-help)
                          'module:(gnu packages guile)'"))
   (display (G_ "
   -m, --manifest=FILE    select all the packages from the manifest in FILE"))
+  (display (G_ "
+      --target-version=VERSION
+                         update the package or packages to VERSION"))
   (display (G_ "
   -t, --type=UPDATER,... restrict to updates from the specified updaters
                          (e.g., 'gnu')"))
@@ -213,17 +220,20 @@ (define-record-type <update-spec>
 (define* (update-spec package #:optional version)
   (%update-spec package version))
 
-(define (update-specification->update-spec spec)
+(define (update-specification->update-spec spec fallback-version)
   "Given SPEC, a package name like \"guile@2.0=2.0.8\", return a <update>
-record with two fields: the package to upgrade, and the target version."
+record with two fields: the package to upgrade, and the target version.  When
+SPEC lacks a version, use FALLBACK-VERSION."
   (match (string-rindex spec #\=)
-    (#f  (update-spec (specification->package spec) #f))
+    (#f  (update-spec (specification->package spec) fallback-version))
     (idx (update-spec (specification->package (substring spec 0 idx))
                       (substring spec (1+ idx))))))
 
 (define (options->update-specs opts)
   "Return the list of <update-spec> records requested by OPTS, honoring
 options like '--recursive'."
+  (define target-version (assoc-ref opts 'target-version))
+
   (define core-package?
     (let* ((input->package (match-lambda
                              ((name (? package? package) _ ...) package)
@@ -263,13 +273,18 @@ (define update-specs
     ;; Update specs explicitly passed as command-line arguments.
     (match (append-map (match-lambda
                          (('argument . spec)
-                          ;; Take either the specified version or the
+                          ;; Take either the specified version or the latest
-                          ;; latest one.
+                          ;; one.  The version specified as part of a spec
-                          (list (update-specification->update-spec spec)))
+                          ;; takes precedence, with the command-line specified
+                          ;; --target-version used as a fallback.
+                          (list (update-specification->update-spec
+                                 spec target-version)))
                          (('expression . exp)
-                          (list (update-spec (read/eval-package-expression exp))))
+                          (list (update-spec (read/eval-package-expression exp)
+                                             target-version)))
                          (('manifest . manifest)
-                          (map update-spec (packages-from-manifest manifest)))
+                          (map (cut update-spec <> target-version)
+                               (packages-from-manifest manifest)))
                          (_
                           '()))
                        opts)

tests/guix-refresh.sh

@@ -109,6 +109,13 @@ case "$(guix refresh -t test guile=2.0.0 2>&1)" in
     *"failed to find"*"2.0.0"*) true;;
     *) false;;
 esac
+
+guix refresh -t test guile --target-version=2.0.0 # XXX: should return non-zero?
+case "$(guix refresh -t test guile --target-version=2.0.0 2>&1)" in
+    *"failed to find"*"2.0.0"*) true;;
+    *) false;;
+esac
+
 for spec in "guile=1.6.4" "guile@3=1.6.4"
 do
     guix refresh -t test "$spec"