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(define-module (freya services cow)
#:use-module (gnu services shepherd)
#:use-module (guix modules)
#:use-module (gnu))
; guix doesnt export the cow store
; bruch >:(
(define %backing-directory
;; Sub-directory used as the backing store for copy-on-write.
"/tmp/guix-inst")
(define cow-store-service-type
(shepherd-service-type
'cow-store
(lambda _
(define (import-module? module)
;; Since we don't use deduplication support in 'populate-store', don't
;; import (guix store deduplication) and its dependencies, which
;; includes Guile-Gcrypt.
(and (guix-module-name? module)
(not (equal? module '(guix store deduplication)))))
(shepherd-service
(requirement '(root-file-system user-processes))
(provision '(cow-store))
(documentation
"Make the store copy-on-write, with writes going to \
the given target.")
;; This is meant to be explicitly started by the user.
(auto-start? #f)
(modules `((gnu build install)
,@%default-modules))
(start
(with-imported-modules (source-module-closure
'((gnu build install))
#:select? import-module?)
#~(case-lambda
((target)
(mount-cow-store target #$%backing-directory)
target)
(else
;; Do nothing, and mark the service as stopped.
#f))))
(stop #~(lambda (target)
;; Delete the temporary directory, but leave everything
;; mounted as there may still be processes using it since
;; 'user-processes' doesn't depend on us. The 'user-file-systems'
;; service will unmount TARGET eventually.
(delete-file-recursively
(string-append target #$%backing-directory))))))
(description "Make the store copy-on-write, with writes going to \
the given target.")))
(define-public (cow-store-service)
"Return a service that makes the store copy-on-write, such that writes go to
the user's target storage device rather than on the RAM disk."
;; See <http://bugs.gnu.org/18061> for the initial report.
(service cow-store-service-type 'mooooh!))
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