[bug#55220,2/4] platform: Add discovery support.
Commit Message
* gnu/platform.scm (platform-modules, systems, targets): New procedures.
(%platforms): New variable.
Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
---
gnu/platform.scm | 62 +++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 59 insertions(+), 3 deletions(-)
Comments
Mathieu Othacehe <othacehe@gnu.org> skribis:
> * gnu/platform.scm (platform-modules, systems, targets): New procedures.
> (%platforms): New variable.
>
> Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
[...]
> +(define %platforms
> + ;; The list of publically-known platforms.
> + (delay (fold-module-public-variables (lambda (obj result)
> + (if (platform? obj)
> + (cons obj result)
> + result))
> + '()
> + (platform-modules))))
Maybe expose it as a memoizing procedure thunk called ‘platforms’, for
consistency with the names ‘systems’ and ‘targets’.
> +
> +;;;
> +;;; Systems & Targets.
> +;;;
> +
> +(define (systems)
> + "Return the list of supported systems."
> + (delete-duplicates
> + (filter-map platform-system (force %platforms))))
> +
> +(define (targets)
> + "Return the list of supported targets."
> + (map platform-target (force %platforms)))
Or ‘supported-systems’ and ‘supported-targets’?
Ludo’.
> Maybe expose it as a memoizing procedure thunk called ‘platforms’, for
> consistency with the names ‘systems’ and ‘targets’.
Done.
> Or ‘supported-systems’ and ‘supported-targets’?
That would clash with the supported-systems field of <package>.
But by the way, there's already a %supported-systems in (guix packages)
that I would like to replace by systems. However importing (gnu
platform) from there seems problematic.
Thanks,
Mathieu
@@ -17,22 +17,78 @@
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu platform)
+ #:use-module (guix discovery)
#:use-module (guix records)
+ #:use-module (guix ui)
+ #:use-module (srfi srfi-1)
#:export (platform
platform?
platform-target
platform-system
- platform-linux-architecture))
+ platform-linux-architecture
+
+ platform-modules
+ %platforms
+
+ systems
+ targets))
;;;
;;; Platform record.
;;;
-;; Description of a platform supported by the GNU system.
+;; Description of a platform supported by GNU Guix.
+;;
+;; The 'target' field must be a valid GNU triplet as defined here:
+;; https://www.gnu.org/software/autoconf/manual/autoconf-2.68/html_node/Specifying-Target-Triplets.html.
+;; It is used for cross-compilation purposes.
+;;
+;; The 'system' field is the name of the corresponding system as defined in
+;; the (gnu packages bootstrap) module. It can be for instance
+;; "aarch64-linux" or "armhf-linux". It is used to emulate a different host
+;; architecture, for instance i686-linux on x86_64-linux-gnu, or armhf-linux
+;; on x86_64-linux, using the QEMU binfmt transparent emulation mechanism.
+;;
+;; The 'linux-architecture' is only relevant if the kernel is Linux. In that
+;; case, it corresponds to the ARCH variable used when building Linux.
(define-record-type* <platform> platform make-platform
platform?
(target platform-target) ;"x86_64-linux-gnu"
(system platform-system) ;"x86_64-linux"
- (linux-architecture platform-linux-architecture ;"amd64"
+ (linux-architecture platform-linux-architecture ;"x86"
(default #f)))
+
+;;;
+;;; Platforms.
+;;;
+
+(define (platform-modules)
+ "Return the list of platform modules."
+ (all-modules (map (lambda (entry)
+ `(,entry . "gnu/platforms"))
+ %load-path)
+ #:warn warn-about-load-error))
+
+(define %platforms
+ ;; The list of publically-known platforms.
+ (delay (fold-module-public-variables (lambda (obj result)
+ (if (platform? obj)
+ (cons obj result)
+ result))
+ '()
+ (platform-modules))))
+
+
+;;;
+;;; Systems & Targets.
+;;;
+
+(define (systems)
+ "Return the list of supported systems."
+ (delete-duplicates
+ (filter-map platform-system (force %platforms))))
+
+(define (targets)
+ "Return the list of supported targets."
+ (map platform-target (force %platforms)))