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services: Add 'fstab-service-type'.
* gnu/services/base.scm (file-system->fstab-entry) (file-systems->fstab): New procedures. (fstab-service-type): New variable. * gnu/services/base.scm (file-system-dmd-service): New procedure, taken from... (file-system-service-type): ... here. * gnu/system.scm (essential-services): Add FSTAB-SERVICE-TYPE instance.
This commit is contained in:
Ludovic Courtès
parent
12d38e8d43
commit
e43e84ba7a
2 changed files with 112 additions and 62 deletions
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@ -43,7 +43,8 @@ (define-module (gnu services base)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 match)
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#:use-module (ice-9 format)
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#:export (root-file-system-service
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#:export (fstab-service-type
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root-file-system-service
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file-system-service
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user-unmount-service
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device-mapping-service
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@ -105,6 +106,48 @@ (define-module (gnu services base)
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;;; File systems.
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;;;
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(define (file-system->fstab-entry file-system)
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"Return a @file{/etc/fstab} entry for @var{file-system}."
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(string-append (case (file-system-title file-system)
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((label)
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(string-append "LABEL=" (file-system-device file-system)))
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((uuid)
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(string-append
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"UUID="
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(uuid->string (file-system-device file-system))))
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(else
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(file-system-device file-system)))
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"\t"
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(file-system-mount-point file-system) "\t"
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(file-system-type file-system) "\t"
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(or (file-system-options file-system) "defaults") "\t"
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;; XXX: Omit the 'fs_freq' and 'fs_passno' fields because we
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;; don't have anything sensible to put in there.
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))
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(define (file-systems->fstab file-systems)
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"Return a @file{/etc} entry for an @file{fstab} describing
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@var{file-systems}."
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`(("fstab" ,(plain-file "fstab"
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(string-append
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"\
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# This file was generated from your GuixSD configuration. Any changes
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# will be lost upon reboot or reconfiguration.\n\n"
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(string-join (map file-system->fstab-entry
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file-systems)
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"\n")
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"\n")))))
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(define fstab-service-type
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;; The /etc/fstab service.
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(service-type (name 'fstab)
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(extensions
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(list (service-extension etc-service-type
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file-systems->fstab)))
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(compose identity)
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(extend append)))
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(define %root-file-system-dmd-service
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(dmd-service
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(documentation "Take care of the root file system.")
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@ -170,70 +213,76 @@ (define dependency->dmd-service-name
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((? file-system? fs)
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(file-system->dmd-service-name fs))))
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(define (file-system-dmd-service file-system)
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"Return a list containing the dmd service for @var{file-system}."
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(let ((target (file-system-mount-point file-system))
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(device (file-system-device file-system))
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(type (file-system-type file-system))
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(title (file-system-title file-system))
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(check? (file-system-check? file-system))
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(create? (file-system-create-mount-point? file-system))
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(dependencies (file-system-dependencies file-system)))
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(list (dmd-service
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(provision (list (file-system->dmd-service-name file-system)))
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(requirement `(root-file-system
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,@(map dependency->dmd-service-name dependencies)))
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(documentation "Check, mount, and unmount the given file system.")
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(start #~(lambda args
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;; FIXME: Use or factorize with 'mount-file-system'.
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(let ((device (canonicalize-device-spec #$device '#$title))
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(flags #$(mount-flags->bit-mask
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(file-system-flags file-system))))
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#$(if create?
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#~(mkdir-p #$target)
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#~#t)
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#$(if check?
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#~(begin
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;; Make sure fsck.ext2 & co. can be found.
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(setenv "PATH"
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(string-append
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#$e2fsprogs "/sbin:"
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"/run/current-system/profile/sbin:"
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(getenv "PATH")))
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(check-file-system device #$type))
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#~#t)
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(mount device #$target #$type flags
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#$(file-system-options file-system))
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;; For read-only bind mounts, an extra remount is needed,
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;; as per <http://lwn.net/Articles/281157/>, which still
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;; applies to Linux 4.0.
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(when (and (= MS_BIND (logand flags MS_BIND))
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(= MS_RDONLY (logand flags MS_RDONLY)))
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(mount device #$target #$type
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(logior MS_BIND MS_REMOUNT MS_RDONLY))))
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#t))
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(stop #~(lambda args
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;; Normally there are no processes left at this point, so
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;; TARGET can be safely unmounted.
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;; Make sure PID 1 doesn't keep TARGET busy.
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(chdir "/")
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(umount #$target)
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#f))
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;; We need an additional module.
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(modules `(((gnu build file-systems)
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#:select (check-file-system canonicalize-device-spec))
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,@%default-modules))
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(imported-modules `((gnu build file-systems)
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,@%default-imported-modules))))))
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(define file-system-service-type
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;; TODO(?): Make this an extensible service that takes <file-system> objects
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;; and returns a list of <dmd-service>.
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(dmd-service-type
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'file-system
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(lambda (file-system)
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(let ((target (file-system-mount-point file-system))
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(device (file-system-device file-system))
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(type (file-system-type file-system))
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(title (file-system-title file-system))
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(check? (file-system-check? file-system))
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(create? (file-system-create-mount-point? file-system))
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(dependencies (file-system-dependencies file-system)))
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(dmd-service
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(provision (list (file-system->dmd-service-name file-system)))
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(requirement `(root-file-system
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,@(map dependency->dmd-service-name dependencies)))
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(documentation "Check, mount, and unmount the given file system.")
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(start #~(lambda args
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;; FIXME: Use or factorize with 'mount-file-system'.
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(let ((device (canonicalize-device-spec #$device '#$title))
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(flags #$(mount-flags->bit-mask
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(file-system-flags file-system))))
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#$(if create?
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#~(mkdir-p #$target)
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#~#t)
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#$(if check?
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#~(begin
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;; Make sure fsck.ext2 & co. can be found.
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(setenv "PATH"
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(string-append
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#$e2fsprogs "/sbin:"
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"/run/current-system/profile/sbin:"
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(getenv "PATH")))
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(check-file-system device #$type))
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#~#t)
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(mount device #$target #$type flags
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#$(file-system-options file-system))
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;; For read-only bind mounts, an extra remount is needed,
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;; as per <http://lwn.net/Articles/281157/>, which still
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;; applies to Linux 4.0.
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(when (and (= MS_BIND (logand flags MS_BIND))
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(= MS_RDONLY (logand flags MS_RDONLY)))
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(mount device #$target #$type
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(logior MS_BIND MS_REMOUNT MS_RDONLY))))
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#t))
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(stop #~(lambda args
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;; Normally there are no processes left at this point, so
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;; TARGET can be safely unmounted.
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;; Make sure PID 1 doesn't keep TARGET busy.
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(chdir "/")
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(umount #$target)
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#f))
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;; We need an additional module.
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(modules `(((gnu build file-systems)
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#:select (check-file-system canonicalize-device-spec))
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,@%default-modules))
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(imported-modules `((gnu build file-systems)
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,@%default-imported-modules)))))))
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(service-type (name 'file-system)
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(extensions
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(list (service-extension dmd-root-service-type
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file-system-dmd-service)
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(service-extension fstab-service-type
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identity)))))
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(define* (file-system-service file-system)
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"Return a service that mounts @var{file-system}, a @code{<file-system>}
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@ -299,6 +299,7 @@ (define known-fs
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(operating-system-groups os))
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(operating-system-skeletons os))
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(operating-system-etc-service os)
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(service fstab-service-type '())
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(session-environment-service
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(operating-system-environment-variables os))
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host-name procs root-fs unmount
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