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services: file-system: Filter what goes to /etc/fstab.

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Fixes a longstanding issue whereby, due to our long fstab that included
pseudo file systems like cgroup mounts, graphical file managers would
display all of these.  Initially reported at
<https://lists.gnu.org/archive/html/help-guix/2017-11/msg00084.html>.

* gnu/services/base.scm (file-system-fstab-entries): New procedure.
(file-system-service-type): Use it to extend FSTAB-SERVICE-TYPE.
This commit is contained in:
Ludovic Courtès 2019-04-26 23:46:20 +02:00
parent cdb57a831c
commit 74685a4369
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1 changed files with 18 additions and 1 deletions
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19
gnu/services/base.scm
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@ -510,13 +510,30 @@ (define (known? mount-point)
(cons* sink user-unmount
(map file-system-shepherd-service file-systems))))
(define (file-system-fstab-entries file-systems)
"Return the subset of @var{file-systems} that should have an entry in
@file{/etc/fstab}."
;; /etc/fstab is about telling fsck(8), mount(8), and umount(8) about
;; relevant file systems they'll have to deal with. That excludes "pseudo"
;; file systems.
;;
;; In particular, things like GIO (part of GLib) use it to determine the set
;; of mounts, which is then used by graphical file managers and desktop
;; environments to display "volume" icons. Thus, we really need to exclude
;; those pseudo file systems from the list.
(remove (lambda (file-system)
(or (member (file-system-type file-system)
%pseudo-file-system-types)
(memq 'bind-mount (file-system-flags file-system))))
file-systems))
(define file-system-service-type
(service-type (name 'file-systems)
(extensions
(list (service-extension shepherd-root-service-type
file-system-shepherd-services)
(service-extension fstab-service-type
identity)
file-system-fstab-entries)
;; Have 'user-processes' depend on 'file-systems'.
(service-extension user-processes-service-type