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file-systems: Add a 'mount?' field.
Fixes <http://bugs.gnu.org/22176>. Reported by Florian Paul Schmidt <mista.tapas@gmx.net>. * gnu/system/file-systems.scm (<file-system>)[mount?]: New field. (file-system->spec): Adjust accordingly. * gnu/services/base.scm (file-system-dmd-service): Return the empty list when FILE-SYSTEM has 'mount?' set to false. (user-processes-service): Select the subset of FILE-SYSTEMS that matches 'file-system-mount?'. * doc/guix.texi (File Systems): Document it.
This commit is contained in:
Ludovic Courtès
parent
e43e84ba7a
commit
be21979d85
3 changed files with 60 additions and 48 deletions
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@ -5936,6 +5936,12 @@ bits), and @code{no-exec} (disallow program execution.)
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@item @code{options} (default: @code{#f})
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This is either @code{#f}, or a string denoting mount options.
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@item @code{mount?} (default: @code{#t})
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This value indicates whether to automatically mount the file system when
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the system is brought up. When set to @code{#f}, the file system gets
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an entry in @file{/etc/fstab} (read by the @command{mount} command) but
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is not automatically mounted.
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@item @code{needed-for-boot?} (default: @code{#f})
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This Boolean value indicates whether the file system is needed when
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booting. If that is true, then the file system is mounted when the
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@ -222,57 +222,60 @@ (define (file-system-dmd-service 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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(if (file-system-mount? file-system)
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(list
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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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#$(file-system-options file-system))
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(mount device #$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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;; For read-only bind mounts, an extra remount is
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;; needed, as per <http://lwn.net/Articles/281157/>,
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;; which still 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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;; Make sure PID 1 doesn't keep TARGET busy.
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(chdir "/")
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(umount #$target)
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#f))
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(umount #$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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;; 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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'())))
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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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@ -416,7 +419,7 @@ (define* (user-processes-service file-systems #:key (grace-delay 4))
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All the services that spawn processes must depend on this one so that they are
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stopped before 'kill' is called."
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(service user-processes-service-type
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(list file-systems grace-delay)))
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(list (filter file-system-mount? file-systems) grace-delay)))
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;;;
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@ -35,6 +35,7 @@ (define-module (gnu system file-systems)
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file-system-needed-for-boot?
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file-system-flags
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file-system-options
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file-system-mount?
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file-system-check?
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file-system-create-mount-point?
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file-system-dependencies
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@ -93,6 +94,8 @@ (define-record-type* <file-system> file-system
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(default '()))
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(options file-system-options ; string or #f
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(default #f))
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(mount? file-system-mount? ; Boolean
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(default #t))
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(needed-for-boot? %file-system-needed-for-boot? ; Boolean
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(default #f))
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(check? file-system-check? ; Boolean
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@ -112,7 +115,7 @@ (define (file-system->spec fs)
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"Return a list corresponding to file-system FS that can be passed to the
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initrd code."
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(match fs
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(($ <file-system> device title mount-point type flags options _ check?)
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(($ <file-system> device title mount-point type flags options _ _ check?)
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(list device title mount-point type flags options check?))))
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(define %uuid-rx
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