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(define-module (gnu home-services state)
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:use-module (gnu home services)
#:use-module (gnu home-services-utils)
#:use-module (gnu home services shepherd)
#:use-module (gnu home-services version-control)
#:use-module (gnu services shepherd)
#:use-module (gnu services configuration)
#:use-module (gnu packages ssh)
#:use-module (guix packages)
#:use-module (guix gexp)
#:use-module (guix monads)
#:use-module (guix modules)
#:use-module (guix records)
#:export (home-state-service-type
state-generic
state-git
state-hg
state-rsync))
(use-modules (gnu packages version-control))
(define* (state-hg path remote #:key (config #f))
(state-generic
path
#:init-gexp
#~(lambda* (_ self)
(let* ((meta (perform-service-action self 'metadata))
(path (assoc-ref meta 'path))
(remote (assoc-ref meta 'remote)))
(format #t "Initializing ~a.\n" self)
(let* ((port ((@@ (guix build utils) open-pipe-with-stderr)
#$(file-append mercurial "/bin/hg") "clone" remote path)))
(waitpid WAIT_ANY)
(display ((@ (ice-9 rdelim) read-delimited) "" port))
(close-port port))
(when '#$config
(call-with-output-file (string-append path "/.hg/hgrc")
(lambda (port) (display (string-append
#$@(serialize-hg-config config)) port))))))
#:additional-metadata `((remote . ,remote)
(general-sync? . #f))))
(define* (state-git path remote #:key (config #f))
(state-generic
path
#:init-gexp
#~(lambda* (_ self)
(let* ((meta (perform-service-action self 'metadata))
(path (assoc-ref meta 'path))
(remote (assoc-ref meta 'remote)))
(format #t "Initializing ~a.\n" self)
;; TODO: revisit git clone implementation
;; FIXME: Hang up shepherd if username/password asked
(let* ((port ((@@ (guix build utils) open-pipe-with-stderr)
#$(file-append git "/bin/git") "clone" remote path)))
(waitpid WAIT_ANY)
(display ((@ (ice-9 rdelim) read-delimited) "" port))
(close-port port))
(when #$config
(call-with-output-file (string-append path "/.git/config")
(lambda (port) (display #$config port))))))
#:additional-metadata `((remote . ,remote)
(general-sync? . #f))))
(use-modules (gnu packages rsync))
(define* (state-rsync path remote)
(state-generic
path
#:init-gexp
#~(lambda* (_ self)
(let* ((meta (perform-service-action self 'metadata))
(path (assoc-ref meta 'path))
(remote (assoc-ref meta 'remote)))
(format #t "Initializing ~a.\n" self)
;; TODO: revisit git clone implementation
(let* ((port ((@@ (guix build utils) open-pipe-with-stderr)
#$(file-append rsync "/bin/rsync") "-aP" remote path)))
(waitpid WAIT_ANY)
(display ((@ (ice-9 rdelim) read-delimited) "" port))
(close-port port))))
#:sync-gexp
#~(lambda* (_ self)
(let* ((meta (perform-service-action self 'metadata))
(path (assoc-ref meta 'path))
(remote (assoc-ref meta 'remote)))
(format #t "Synchronizing ~a.\n" self)
(let* ((port ((@@ (guix build utils) open-pipe-with-stderr)
#$(file-append rsync "/bin/rsync") "-aP" path remote)))
(waitpid WAIT_ANY)
(display ((@ (ice-9 rdelim) read-delimited) "" port))
(close-port port))))
#:additional-metadata `((remote . ,remote)
(general-sync? . #t))))
(define %service-get-gexp
#~(lambda (x)
(car
(filter
(lambda (y) (eq? (car (service-provision y)) x))
((@@ (shepherd service) service-list))))))
(define* (state-generic
path
#:key
(init-gexp
#~(lambda* (_ self)
(let ((path (assoc-ref (perform-service-action self 'metadata) 'path)))
(format #t "Initializing ~a.\n" self)
(format #t "Creating ~a directory..." path)
(mkdir-p path)
(display " done\n"))))
(sync-gexp
#~(lambda* (_ self)
(let ((path (assoc-ref (perform-service-action self 'metadata) 'path)))
(format #t "Synchronizing ~a.\n" self)
(format #t "Nothing to synchronize.\n"))))
(additional-metadata '((general-sync? . #f))))
"A function which returns a shepherd-service with all required
actions for state management, should be used as a basis for other
state related items like git-state, rsync-state, etc."
(let ((self (string->symbol
(format #f "state-~a" path))))
(shepherd-service
(documentation (format #f "Managing state at ~a." path))
(provision (list self))
(auto-start? #f)
(start #~(lambda ()
(if (perform-service-action (#$%service-get-gexp '#$self) 'state-exists?)
#t
(begin
(format #t "~a is not initilized yet." '#$self)
#f))))
(actions (list
(shepherd-action
(name 'state-exists?)
(documentation "Check if state file/directory exists.")
(procedure #~(lambda* (#:rest rest)
(file-exists? #$path))))
(shepherd-action
(name 'unchecked-init)
(documentation "Do not use this action directly.")
(procedure #~(lambda* (#:rest rest)
(#$init-gexp rest (#$%service-get-gexp '#$self)))))
(shepherd-action
(name 'metadata)
(documentation "Returns metadata related to the state.")
(procedure #~(lambda* _
(append
`((path . #$path)
(self . ,(#$%service-get-gexp '#$self)))
'#$additional-metadata))))
(shepherd-action
(name 'sync)
(documentation "Sync the state.")
(procedure #~(lambda* (#:rest rest)
(#$sync-gexp rest (#$%service-get-gexp '#$self)))))
(shepherd-action
(name 'init)
(documentation "Generic initialize.")
(procedure #~(lambda* (#:rest rest)
(if (perform-service-action (#$%service-get-gexp '#$self) 'state-exists?)
(format #t "~a already initialized.\n" '#$self)
(begin
(perform-service-action (#$%service-get-gexp '#$self) 'unchecked-init (#$%service-get-gexp '#$self))
(start-service (#$%service-get-gexp '#$self))))))))))))
(define (add-shepherd-services services)
(let* ((service-names
(map
(lambda (service) (car (shepherd-service-provision service)))
services)))
(append
services
(list
(shepherd-service
(documentation "Init, update and maybe destroy state.")
(provision '(state))
(auto-start? #t)
(start #~(lambda ()
(map (lambda (name)
(let ((name (#$%service-get-gexp name)))
(when (perform-service-action name 'state-exists?)
(start-service name))))
'#$service-names)))
(actions (list
(shepherd-action
(name 'sync)
(documentation
"Sync all the state. Highly dependent on state type.")
(procedure
#~(lambda _
(map (lambda (name)
(let ((name (#$%service-get-gexp name)))
(when (assoc-ref (perform-service-action name 'metadata)
'general-sync?)
(perform-service-action name 'sync name))))
'#$service-names))))
(shepherd-action
(name 'init)
(documentation "Initialize all the state.")
(procedure #~(lambda _
(map (lambda (name)
(let ((name (#$%service-get-gexp name)))
(when (not (perform-service-action name 'state-exists?))
(perform-service-action name 'init)
(start-service name))))
'#$service-names)))))))))))
(define home-state-service-type
(service-type (name 'home-state)
(extensions
(list (service-extension
home-shepherd-service-type
add-shepherd-services)))
(default-value '())
(compose concatenate)
(extend append)
(description "A toolset for initializing state.")))
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