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file-system: Add mount-may-fail? option.

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* gnu/system/file-systems.scm (<file-system>): Add a mount-may-fail? field.
(file-system->spec): adapt accordingly,
(spec->file-system): ditto.
* gnu/build/file-systems.scm (mount-file-system): If 'system-error is raised
and mount-may-fail? is true, ignore it. Otherwise, re-raise the exception.

Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
This commit is contained in:
Mathieu Othacehe 2020-07-31 13:43:20 +02:00
parent 6bb07e91e1
commit 7c27bd115b
No known key found for this signature in database
GPG key ID: 8354763531769CA6
2 changed files with 34 additions and 22 deletions
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45
gnu/build/file-systems.scm
View file

@ -814,26 +814,33 @@ (define (mount-nfs source mount-point type flags options)
(when (file-system-check? fs)
(check-file-system source type))
;; Create the mount point. Most of the time this is a directory, but
;; in the case of a bind mount, a regular file or socket may be needed.
(if (and (= MS_BIND (logand flags MS_BIND))
(not (file-is-directory? source)))
(unless (file-exists? mount-point)
(mkdir-p (dirname mount-point))
(call-with-output-file mount-point (const #t)))
(mkdir-p mount-point))
(catch 'system-error
(lambda ()
;; Create the mount point. Most of the time this is a directory, but
;; in the case of a bind mount, a regular file or socket may be
;; needed.
(if (and (= MS_BIND (logand flags MS_BIND))
(not (file-is-directory? source)))
(unless (file-exists? mount-point)
(mkdir-p (dirname mount-point))
(call-with-output-file mount-point (const #t)))
(mkdir-p mount-point))
(cond
((string-prefix? "nfs" type)
(mount-nfs source mount-point type flags options))
(else
(mount source mount-point type flags options)))
(cond
((string-prefix? "nfs" type)
(mount-nfs source mount-point type flags options))
(else
(mount source mount-point type flags options)))
;; For read-only bind mounts, an extra remount is needed, as per
;; <http://lwn.net/Articles/281157/>, which still applies to Linux 4.0.
(when (and (= MS_BIND (logand flags MS_BIND))
(= MS_RDONLY (logand flags MS_RDONLY)))
(let ((flags (logior MS_BIND MS_REMOUNT MS_RDONLY)))
(mount source mount-point type flags #f)))))
;; For read-only bind mounts, an extra remount is needed, as per
;; <http://lwn.net/Articles/281157/>, which still applies to Linux
;; 4.0.
(when (and (= MS_BIND (logand flags MS_BIND))
(= MS_RDONLY (logand flags MS_RDONLY)))
(let ((flags (logior MS_BIND MS_REMOUNT MS_RDONLY)))
(mount source mount-point type flags #f))))
(lambda args
(or (file-system-mount-may-fail? fs)
(apply throw args))))))
;;; file-systems.scm ends here

11
gnu/system/file-systems.scm
View file

@ -48,6 +48,7 @@ (define-module (gnu system file-systems)
alist->file-system-options
file-system-mount?
file-system-mount-may-fail?
file-system-check?
file-system-create-mount-point?
file-system-dependencies
@ -114,6 +115,8 @@ (define-record-type* <file-system> %file-system
(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
@ -301,18 +304,19 @@ (define (file-system->spec fs)
"Return a list corresponding to file-system FS that can be passed to the
initrd code."
(match fs
(($ <file-system> device mount-point type flags options _ _ check?)
(($ <file-system> device mount-point type flags options mount?
mount-may-fail? needed-for-boot? check?)
(list (cond ((uuid? device)
`(uuid ,(uuid-type device) ,(uuid-bytevector device)))
((file-system-label? device)
`(file-system-label ,(file-system-label->string device)))
(else device))
mount-point type flags options check?))))
mount-point type flags options mount-may-fail? check?))))
(define (spec->file-system sexp)
"Deserialize SEXP, a list, to the corresponding <file-system> object."
(match sexp
((device mount-point type flags options check?)
((device mount-point type flags options mount-may-fail? check?)
(file-system
(device (match device
(('uuid (? symbol? type) (? bytevector? bv))
@ -323,6 +327,7 @@ (define (spec->file-system sexp)
device)))
(mount-point mount-point) (type type)
(flags flags) (options options)
(mount-may-fail? mount-may-fail?)
(check? check?)))))
(define (specification->file-system-mapping spec writable?)