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file-systems: Add a 'dependencies' field to <file-system>.

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* gnu/system/file-systems.scm (<file-system>)[dependencies]: New field.
* gnu/system.scm (other-file-system-services)[requirements]: Honor
  'file-system-dependencies'.
* doc/guix.texi (File Systems): Document it.
This commit is contained in:
Ludovic Courtès 2015-07-17 19:24:15 +02:00
parent 97121c2a21
commit e51710d1ef
3 changed files with 23 additions and 5 deletions
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8
doc/guix.texi
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@ -5027,6 +5027,14 @@ errors before being mounted.
@item @code{create-mount-point?} (default: @code{#f})
When true, the mount point is created if it does not exist yet.
@item @code{dependencies} (default: @code{'()})
This is a list of @code{<file-system>} objects representing file systems
that must be mounted before (and unmounted after) this one.
As an example, consider a hierarchy of mounts: @file{/sys/fs/cgroup} is
a dependency of @file{/sys/fs/cgroup/cpu} and
@file{/sys/fs/cgroup/memory}.
@end table
@end deftp

14
gnu/system.scm
View file

@ -228,10 +228,16 @@ (define (device-mappings fs)
(operating-system-mapped-devices os)))
(define (requirements fs)
(map (lambda (md)
(symbol-append 'device-mapping-
(string->symbol (mapped-device-target md))))
(device-mappings fs)))
;; XXX: Fiddling with dmd service names is not nice.
(append (map (lambda (fs)
(symbol-append 'file-system-
(string->symbol
(file-system-mount-point fs))))
(file-system-dependencies fs))
(map (lambda (md)
(symbol-append 'device-mapping-
(string->symbol (mapped-device-target md))))
(device-mappings fs))))
(sequence %store-monad
(map (lambda (fs)

6
gnu/system/file-systems.scm
View file

@ -37,6 +37,7 @@ (define-module (gnu system file-systems)
file-system-options
file-system-check?
file-system-create-mount-point?
file-system-dependencies
file-system->spec
string->uuid
@ -97,7 +98,10 @@ (define-record-type* <file-system> file-system
(check? file-system-check? ; Boolean
(default #t))
(create-mount-point? file-system-create-mount-point? ; Boolean
(default #f)))
(default #f))
(dependencies file-system-dependencies ; list of strings (mount
; points depended on)
(default '())))
(define-inlinable (file-system-needed-for-boot? fs)
"Return true if FS has the 'needed-for-boot?' flag set, or if it's the root