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inferior: Use a safe symlink monadic procedure. 

This is a follow-up of 6ee7e3d26b.

* guix/inferior.scm (cached-channel-instance): Introduce "symlink/safe" and
use it instead of symlink. Remove the duplicated "file-exists?" call.
This commit is contained in:
Mathieu Othacehe 2021-03-10 12:08:10 +01:00
parent 8898eaec57
commit a831ff6bc3
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1 changed files with 11 additions and 4 deletions
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guix/inferior.scm
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@ -740,8 +740,16 @@ determines whether CHANNELS are authenticated."
(string-append directory "/" file))
(scandir directory base32-encoded-sha256?)))
(define (symlink/safe old new)
(catch 'system-error
(lambda ()
(symlink old new))
(lambda args
(unless (= EEXIST (system-error-errno args))
(apply throw args)))))
(define symlink*
(lift2 symlink %store-monad))
(lift2 symlink/safe %store-monad))
(define add-indirect-root*
(store-lift add-indirect-root))
@ -766,9 +774,8 @@ determines whether CHANNELS are authenticated."
(built-derivations (list profile))
;; Note: Caching is fine even when AUTHENTICATE? is false because
;; we always call 'latest-channel-instances?'.
(unless (file-exists? cached)
(symlink* (derivation->output-path profile) cached)
(add-indirect-root* cached))
(symlink* (derivation->output-path profile) cached)
(add-indirect-root* cached)
(return cached))))))
(define* (inferior-for-channels channels