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offload: Ignore EEXIST when registering a .drv as a GC root.

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Fixes <http://bugs.gnu.org/18115>.
Reported by Mark H Weaver <mhw@netris.org>.

* guix/scripts/offload.scm (register-gc-root)[script]: Wrap 'symlink'
  call in "catch 'system-error", and ignore EEXIST errors.
This commit is contained in:
Ludovic Courtès 2014-08-29 14:53:15 +02:00
parent b1e48f222b
commit b9a31d90e9
1 changed files with 11 additions and 2 deletions
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13
guix/scripts/offload.scm
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@ -316,8 +316,17 @@ (define script
(let ((root-directory (string-append %state-directory
"/gcroots/tmp")))
(false-if-exception (mkdir root-directory))
(symlink ,file
(string-append root-directory "/" ,%gc-root-file)))))
(catch 'system-error
(lambda ()
(symlink ,file
(string-append root-directory "/" ,%gc-root-file)))
(lambda args
;; If FILE already exists, we can assume that either it's a stale
;; reference (which is fine), or another process is already
;; building the derivation represented by FILE (which is fine
;; too.) Thus, do nothing in that case.
(unless (= EEXIST (system-error-errno args))
(apply throw args)))))))
(let ((pipe (remote-pipe machine OPEN_READ
`("guile" "-c" ,(object->string script)))))