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GUIX中输入重写时如何使用劣势？

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GUIX中输入重写时如何使用劣势？

这GUIX 下级手册指出

因此，您几乎可以在任何要插入常规包的地方插入劣质包：在清单中、在操作系统声明的包字段中，等等。

但是，我无法弄清楚在重写包的输入时如何使用 Inferior。例如这个清单，基于手册的定义包变体部分，对我不起作用：

(use-modules (guix inferior) (guix channels) (guix packages)
             (srfi srfi-1))
(use-package-modules docker)
(use-package-modules python-xyz)

(define mychannels
  (list (channel
         (name 'guix)
         (url "https://git.savannah.gnu.org/git/guix.git")
         ;; Last commit that still has python-pyyaml 5.4.1.
         (commit
          "d3e1a94391a838332b0565d56762a58cf87ac6b1"))))

(define myinferior
  (inferior-for-channels mychannels))

(define pyyaml5
  (first (lookup-inferior-packages myinferior "python-pyyaml")))


(define pyyaml5-instead-of-pyyaml6
  ;; This is a procedure to replace pyyaml 6.0 by pyyaml 5.4.1.

  ;; The line below does not work, raises this error:
  ;; In procedure package-properties: Wrong type argument:
  ;; #<inferior-package [email protected] 7f42653831b0>
  (package-input-rewriting `((,python-pyyaml . , pyyaml5)))

  ;; The line below does work (and has a similar result).
  ;(package-input-rewriting `((,python-pyyaml . , python-pyyaml-for-awscli)))
  )

(define docker-compose-with-pyyaml5
  (pyyaml5-instead-of-pyyaml6 docker-compose))

(packages->manifest
 (list pyyaml5
       (specification->package "python")
       docker-compose-with-pyyaml5
       ))

docker-compose仅适用于python-pyyaml5.4.1，频道中的版本已升级至6.0。因此，我尝试进行的重写是将输入重写为docker-compose使用python-pyyaml早期版本的通道中的 5.4.1。但是，我的尝试失败了

Backtrace:
In guix/packages.scm:
  1269:17 19 (supported-package? #<package [email protected] gu…> …)
In guix/memoization.scm:
    101:0 18 (_ #<hash-table 7fa05e6274c0 152/223> #<package docker…> …)
In guix/packages.scm:
  1247:37 17 (_)
  1507:16 16 (package->bag _ _ _ #:graft? _)
  1608:48 15 (thunk)
  1403:25 14 (inputs _)
In srfi/srfi-1.scm:
   586:29 13 (map1 (("python-cached-property" #<package python-…>) …))
   586:29 12 (map1 (("python-distro" #<package python-distro@1.…>) …))
   586:29 11 (map1 (("python-docker" #<package python-docker@5.…>) …))
   586:29 10 (map1 (("python-dockerpty" #<package python-docker…>) …))
   586:29  9 (map1 (("python-docopt" #<package python-docopt@0.…>) …))
   586:29  8 (map1 (("python-dotenv" #<package python-dotenv@0.…>) …))
   586:29  7 (map1 (("python-jsonschema" #<package python-jsons…>) …))
   586:17  6 (map1 (("python-pyyaml" #<package python-pyyaml@6.…>) …))
In guix/packages.scm:
  1360:20  5 (rewrite ("python-pyyaml" #<package [email protected]…>))
In guix/memoization.scm:
    101:0  4 (_ #<hash-table 7fa06ac0b540 8/31> #<package python-py…> …)
In guix/packages.scm:
  1377:22  3 (_)
  1435:37  2 (loop #<inferior-package [email protected] 7fa06304b3…>)
In ice-9/boot-9.scm:
  1685:16  1 (raise-exception _ #:continuable? _)
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
In procedure package-properties: Wrong type argument: #<inferior-package [email protected] 7fa06304b3f0>

我怎样才能用劣质的输入重写呢？

python-pyyaml显然频道中现在有一个5.4.1，名为python-pyyaml-for-awscli.使用该包重写输入docker-compose确实可以按预期工作，因此据我所知，我在重写输入时使用了正确的语法。 （我不确定反引号、点和逗号的作用，也许那里有错误。）

（对于 XY 问题，我现在可以docker-compose使用运行python-pyaml-for-awscli，但是我仍然对如何使用 Inferior 感兴趣，因为接下来可能没有这样的包可用。）

答案1

显然，现在有一个modify-inputsGUIX 1.3.0 中还没有的功能，我不知道是否有一个“nightly”在线文档可以链接到。

这有效：

(use-modules (guix inferior) (guix channels) (guix packages)
             (srfi srfi-1))
(use-package-modules docker)
(use-package-modules python-xyz)

(define mychannels
  (list (channel
         (name 'guix)
         (url "https://git.savannah.gnu.org/git/guix.git")
         ;; Last commit with pyyaml 5.4.1.
         (commit
          "d3e1a94391a838332b0565d56762a58cf87ac6b1"))))

(define myinferior
  (inferior-for-channels mychannels))

(define pyyaml5
  (first (lookup-inferior-packages myinferior "python-pyyaml")))


(define (also-pyyaml5-instead-of-pyyaml6 apackage)
  ;; This is a procedure to replace pyyaml 6.0 by pyyaml 5.4.1.
  (package
   (inherit apackage)
   (inputs
    (modify-inputs (package-inputs apackage)
                   (replace "python-pyyaml" pyyaml5)))))

(define also-docker-compose-with-pyyaml5
  (also-pyyaml5-instead-of-pyyaml6 docker-compose))

(packages->manifest
 (list python-pyyaml
       (specification->package "python")
       also-docker-compose-with-pyyaml5))

现在docker-compose使用 5.4.1 版本python-pyyaml，配置文件的其余部分使用 6.0。

我仍然不清楚是否可以使用下级 with package-input-rewriting，但 usingmodify-inputs可以实现同样的效果，并且它有效。

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