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services: base: Add optional delayed mount of file-systems 

Add a mechanism to only require mounting a subset of file-system entries
during early Shepherd initialization. Any file-system with additional Shepherd
service requirements (e.g. networking) is not required to provision
'file-systems.

* gnu/services/base.scm (file-system-shepherd-service): Splice
file-system-requirements into the Shepherd service requirement list.
(file-system-shepherd-services): Provision 'file-system only when file system
services without additional Shepherd requirements are started.
* gnu/system/file-systems.scm (file-system): Add shepherd-requirements field
to the file-system record. This field is used for adding additional Shepherd
requirements to a file-system Shepherd service.
* doc/guix.texi: Add documentation for file-system shepherd-requirements.

Change-Id: If0392db03d48e8820aa53df1df482c12ec72e1a5
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
master
Richard Sent 2024-06-01 19:26:16 -04:00 committed by Ludovic Courtès
parent 5d3edff1a6
commit 579df5bc80
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3 changed files with 56 additions and 29 deletions
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14
doc/guix.texi
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@ -17862,6 +17862,20 @@ a dependency of @file{/sys/fs/cgroup/cpu} and
Another example is a file system that depends on a mapped device, for
example for an encrypted partition (@pxref{Mapped Devices}).
@item @code{shepherd-requirements} (default: @code{'()})
This is a list of symbols denoting Shepherd requirements that must be
met before mounting the file system.
As an example, an NFS file system would typically have a requirement for
@code{networking}.
Typically, file systems are mounted before most other Shepherd services
are started. However, file systems with a non-empty
shepherd-requirements field are mounted after Shepherd services have
begun. Any Shepherd service that depends on a file system with a
non-empty shepherd-requirements field must depend on it directly and not
on the generic symbol @code{file-systems}.
@end table
@end deftp

14
gnu/services/base.scm
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@ -404,6 +404,7 @@ upon boot."
(create? (file-system-create-mount-point? file-system))
(mount? (file-system-mount? file-system))
(dependencies (file-system-dependencies file-system))
(requirements (file-system-shepherd-requirements file-system))
(packages (file-system-packages (list file-system))))
(and (or mount? create?)
(with-imported-modules (source-module-closure
@ -412,7 +413,8 @@ upon boot."
(provision (list (file-system->shepherd-service-name file-system)))
(requirement `(root-file-system
udev
,@(map dependency->shepherd-service-name dependencies)))
,@(map dependency->shepherd-service-name dependencies)
,@requirements))
(documentation "Check, mount, and unmount the given file system.")
(start #~(lambda args
#$(if create?
@ -461,12 +463,20 @@ upon boot."
(or (file-system-mount? x)
(file-system-create-mount-point? x)))
file-systems)))
(define sink
(shepherd-service
(provision '(file-systems))
(requirement (cons* 'root-file-system 'user-file-systems
(map file-system->shepherd-service-name
file-systems)))
;; Do not require file systems with Shepherd
;; requirements to provision
;; 'file-systems. Many Shepherd services
;; require 'file-systems, so we would likely
;; deadlock.
(filter (lambda (file-system)
(null? (file-system-shepherd-requirements file-system)))
file-systems))))
(documentation "Target for all the initially-mounted file systems")
(start #~(const #t))
(stop #~(const #f))))

57
gnu/system/file-systems.scm
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@ -57,6 +57,7 @@
file-system-repair
file-system-create-mount-point?
file-system-dependencies
file-system-shepherd-requirements
file-system-location
file-system-type-predicate
@ -161,33 +162,35 @@ flags are found."
(define-record-type* <file-system> file-system
make-file-system
file-system?
(device file-system-device) ; string | <uuid> | <file-system-label>
(mount-point file-system-mount-point) ; string
(type file-system-type) ; string
(flags file-system-flags ; list of symbols
(default '())
(sanitize validate-file-system-flags))
(options file-system-options ; string or #f
(default #f))
(mount? file-system-mount? ; Boolean
(default #t))
(mount-may-fail? file-system-mount-may-fail? ; Boolean
(default #f))
(needed-for-boot? %file-system-needed-for-boot? ; Boolean
(default #f))
(check? file-system-check? ; Boolean
(default #t))
(skip-check-if-clean? file-system-skip-check-if-clean? ; Boolean
(default #t))
(repair file-system-repair ; symbol or #f
(default 'preen))
(create-mount-point? file-system-create-mount-point? ; Boolean
(default #f))
(dependencies file-system-dependencies ; list of <file-system>
(default '())) ; or <mapped-device>
(location file-system-location
(default (current-source-location))
(innate)))
(device file-system-device) ; string | <uuid> | <file-system-label>
(mount-point file-system-mount-point) ; string
(type file-system-type) ; string
(flags file-system-flags ; list of symbols
(default '())
(sanitize validate-file-system-flags))
(options file-system-options ; string or #f
(default #f))
(mount? file-system-mount? ; Boolean
(default #t))
(mount-may-fail? file-system-mount-may-fail? ; Boolean
(default #f))
(needed-for-boot? %file-system-needed-for-boot? ; Boolean
(default #f))
(check? file-system-check? ; Boolean
(default #t))
(skip-check-if-clean? file-system-skip-check-if-clean? ; Boolean
(default #t))
(repair file-system-repair ; symbol or #f
(default 'preen))
(create-mount-point? file-system-create-mount-point? ; Boolean
(default #f))
(dependencies file-system-dependencies ; list of <file-system>
(default '())) ; or <mapped-device>
(shepherd-requirements file-system-shepherd-requirements ; list of symbols
(default '()))
(location file-system-location
(default (current-source-location))
(innate)))
;; A file system label for use in the 'device' field.
(define-record-type <file-system-label>