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scripts: Commands warn when passed zero arguments.

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This is a followup to 3f8326237d.

* guix/scripts/archive.scm (export-from-store): Warn then FILES is
empty.
* guix/scripts/build.scm (guix-build): Likewise.
* guix/scripts/copy.scm (warn-if-empty): New procedure.
(send-to-remote-host, retrieve-from-remote-host): Call it.
* guix/scripts/edit.scm (guix-edit): Warn when SPECS is empty.
* guix/scripts/environment.scm (guix-environment): Warn when MANIFEST
has zero entries.
* guix/scripts/graph.scm (guix-graph): Warn then ITEMS is empty.
* guix/scripts/package.scm (process-actions): Warn when FILES and TRANS
are both empty.
This commit is contained in:
Ludovic Courtès 2021-05-28 10:53:49 +02:00
parent 7243a8c7ec
commit 681af1fb78
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7 changed files with 27 additions and 3 deletions
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guix/scripts/archive.scm
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@ -260,6 +260,9 @@ build and a list of store files to transfer."
resulting archive to the standard output port."
(let-values (((drv files)
(options->derivations+files store opts)))
(when (null? files)
(warning (G_ "no arguments specified; creating an empty archive~%")))
(if (build-derivations store drv)
(export-paths store files (current-output-port)
#:recursive? (assoc-ref opts 'export-recursive?))