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mapped-devices: Allow target to be list of strings.
* gnu/system/mapped-devices.scm (<mapped-device>): Rename constructor to %mapped-device. [target]: Remove field. [targets]: New field. Adjust users. (mapped-device-compatibility-helper, mapped-device): New macros. (mapped-device-target): New deprecated procedure. Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Mikhail Tsykalov
Ludovic Courtès
parent
0a1da4652d
commit
788df2ecd6
5 changed files with 111 additions and 74 deletions
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@ -13780,6 +13780,9 @@ specifying @code{"my-partition"} leads to the creation of
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the @code{"/dev/mapper/my-partition"} device.
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For RAID devices of type @code{raid-device-mapping}, the full device name
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such as @code{"/dev/md0"} needs to be given.
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@item targets
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This list of strings specifies names of the resulting mapped devices in case
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there are several. The format is identical to @var{target}.
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@item type
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This must be a @code{mapped-device-kind} object, which specifies how
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@ -298,7 +298,8 @@ (define (file-system->shepherd-service-name file-system)
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(define (mapped-device->shepherd-service-name md)
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"Return the symbol that denotes the shepherd service of MD, a <mapped-device>."
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(symbol-append 'device-mapping-
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(string->symbol (mapped-device-target md))))
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(string->symbol (string-join
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(mapped-device-targets md) "-"))))
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(define dependency->shepherd-service-name
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(match-lambda
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@ -475,9 +475,9 @@ (define (device-mappings fs)
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(let ((device (file-system-device fs)))
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(if (string? device) ;title is 'device
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(filter (lambda (md)
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(string=? (string-append "/dev/mapper/"
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(mapped-device-target md))
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device))
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(any (cut string=? device <>)
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(map (cut string-append "/dev/mapper" <>)
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(mapped-device-targets md))))
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(operating-system-mapped-devices os))
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'())))
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@ -497,11 +497,12 @@ (define (add-dependencies fs)
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(define (mapped-device-users device file-systems)
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"Return the subset of FILE-SYSTEMS that use DEVICE."
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(let ((target (string-append "/dev/mapper/" (mapped-device-target device))))
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(let ((targets (map (cut string-append "/dev/mapper/" <>)
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(mapped-device-targets device))))
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(filter (lambda (fs)
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(or (member device (file-system-dependencies fs))
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(and (string? (file-system-device fs))
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(string=? (file-system-device fs) target))))
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(any (cut string=? (file-system-device fs) <>) targets))))
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file-systems)))
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(define (operating-system-user-mapped-devices os)
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@ -195,11 +195,11 @@ (define* (raw-initrd file-systems
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(define device-mapping-commands
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;; List of gexps to open the mapped devices.
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(map (lambda (md)
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(let* ((source (mapped-device-source md))
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(target (mapped-device-target md))
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(type (mapped-device-type md))
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(open (mapped-device-kind-open type)))
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(open source target)))
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(let* ((source (mapped-device-source md))
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(targets (mapped-device-targets md))
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(type (mapped-device-type md))
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(open (mapped-device-kind-open type)))
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(open source targets)))
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mapped-devices))
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(define kodir
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@ -28,6 +28,7 @@ (define-module (gnu system mapped-devices)
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formatted-message
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&fix-hint
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&error-location))
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#:use-module (guix deprecation)
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#:use-module (gnu services)
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#:use-module (gnu services shepherd)
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#:use-module (gnu system uuid)
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@ -42,10 +43,12 @@ (define-module (gnu system mapped-devices)
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#:use-module (srfi srfi-35)
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#:use-module (ice-9 match)
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#:use-module (ice-9 format)
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#:export (mapped-device
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#:export (%mapped-device
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mapped-device
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mapped-device?
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mapped-device-source
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mapped-device-target
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mapped-device-targets
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mapped-device-type
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mapped-device-location
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@ -70,15 +73,36 @@ (define-module (gnu system mapped-devices)
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;;;
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;;; Code:
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(define-record-type* <mapped-device> mapped-device
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(define-record-type* <mapped-device> %mapped-device
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make-mapped-device
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mapped-device?
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(source mapped-device-source) ;string | list of strings
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(target mapped-device-target) ;string
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(targets mapped-device-targets) ;list of strings
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(type mapped-device-type) ;<mapped-device-kind>
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(location mapped-device-location
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(default (current-source-location)) (innate)))
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(define-syntax mapped-device-compatibility-helper
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(syntax-rules (target)
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((_ () (fields ...))
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(%mapped-device fields ...))
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((_ ((target exp) rest ...) (others ...))
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(%mapped-device others ...
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(targets (list exp))
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rest ...))
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((_ (field rest ...) (others ...))
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(mapped-device-compatibility-helper (rest ...)
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(others ... field)))))
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(define-syntax-rule (mapped-device fields ...)
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"Build an <mapped-device> record, automatically converting 'target' field
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specifications to 'targets'."
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(mapped-device-compatibility-helper (fields ...) ()))
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(define-deprecated (mapped-device-target md)
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mapped-device-targets
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(car (mapped-device-targets md)))
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(define-record-type* <mapped-device-type> mapped-device-kind
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make-mapped-device-kind
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mapped-device-kind?
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@ -97,14 +121,14 @@ (define device-mapping-service-type
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(shepherd-service-type
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'device-mapping
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(match-lambda
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(($ <mapped-device> source target
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(($ <mapped-device> source targets
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($ <mapped-device-type> open close))
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(shepherd-service
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(provision (list (symbol-append 'device-mapping- (string->symbol target))))
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(provision (list (symbol-append 'device-mapping- (string->symbol (string-join targets "-")))))
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(requirement '(udev))
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(documentation "Map a device node using Linux's device mapper.")
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(start #~(lambda () #$(open source target)))
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(stop #~(lambda _ (not #$(close source target))))
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(start #~(lambda () #$(open source targets)))
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(stop #~(lambda _ (not #$(close source targets))))
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(respawn? #f))))))
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(define (device-mapping-service mapped-device)
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@ -162,48 +186,52 @@ (define missing
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;;; Common device mappings.
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;;;
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(define (open-luks-device source target)
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(define (open-luks-device source targets)
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"Return a gexp that maps SOURCE to TARGET as a LUKS device, using
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'cryptsetup'."
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(with-imported-modules (source-module-closure
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'((gnu build file-systems)))
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#~(let ((source #$(if (uuid? source)
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(uuid-bytevector source)
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source)))
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;; XXX: 'use-modules' should be at the top level.
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(use-modules (rnrs bytevectors) ;bytevector?
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((gnu build file-systems)
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#:select (find-partition-by-luks-uuid)))
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(match targets
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((target)
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#~(let ((source #$(if (uuid? source)
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(uuid-bytevector source)
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source)))
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;; XXX: 'use-modules' should be at the top level.
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(use-modules (rnrs bytevectors) ;bytevector?
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((gnu build file-systems)
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#:select (find-partition-by-luks-uuid)))
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;; Use 'cryptsetup-static', not 'cryptsetup', to avoid pulling the
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;; whole world inside the initrd (for when we're in an initrd).
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(zero? (system* #$(file-append cryptsetup-static "/sbin/cryptsetup")
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"open" "--type" "luks"
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;; Use 'cryptsetup-static', not 'cryptsetup', to avoid pulling the
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;; whole world inside the initrd (for when we're in an initrd).
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(zero? (system* #$(file-append cryptsetup-static "/sbin/cryptsetup")
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"open" "--type" "luks"
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;; Note: We cannot use the "UUID=source" syntax here
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;; because 'cryptsetup' implements it by searching the
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;; udev-populated /dev/disk/by-id directory but udev may
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;; be unavailable at the time we run this.
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(if (bytevector? source)
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(or (let loop ((tries-left 10))
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(and (positive? tries-left)
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(or (find-partition-by-luks-uuid source)
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;; If the underlying partition is
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;; not found, try again after
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;; waiting a second, up to ten
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;; times. FIXME: This should be
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;; dealt with in a more robust way.
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(begin (sleep 1)
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(loop (- tries-left 1))))))
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(error "LUKS partition not found" source))
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source)
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;; Note: We cannot use the "UUID=source" syntax here
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;; because 'cryptsetup' implements it by searching the
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;; udev-populated /dev/disk/by-id directory but udev may
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;; be unavailable at the time we run this.
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(if (bytevector? source)
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(or (let loop ((tries-left 10))
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(and (positive? tries-left)
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(or (find-partition-by-luks-uuid source)
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;; If the underlying partition is
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;; not found, try again after
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;; waiting a second, up to ten
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;; times. FIXME: This should be
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;; dealt with in a more robust way.
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(begin (sleep 1)
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(loop (- tries-left 1))))))
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(error "LUKS partition not found" source))
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source)
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#$target)))))
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#$target)))))))
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(define (close-luks-device source target)
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(define (close-luks-device source targets)
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"Return a gexp that closes TARGET, a LUKS device."
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#~(zero? (system* #$(file-append cryptsetup-static "/sbin/cryptsetup")
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"close" #$target)))
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(match targets
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((target)
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#~(zero? (system* #$(file-append cryptsetup-static "/sbin/cryptsetup")
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"close" #$target)))))
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(define* (check-luks-device md #:key
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needed-for-boot?
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@ -235,36 +263,40 @@ (define luks-device-mapping
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(close close-luks-device)
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(check check-luks-device)))
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(define (open-raid-device sources target)
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(define (open-raid-device sources targets)
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"Return a gexp that assembles SOURCES (a list of devices) to the RAID device
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TARGET (e.g., \"/dev/md0\"), using 'mdadm'."
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#~(let ((sources '#$sources)
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(match targets
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((target)
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#~(let ((sources '#$sources)
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;; XXX: We're not at the top level here. We could use a
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;; non-top-level 'use-modules' form but that doesn't work when the
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;; code is eval'd, like the Shepherd does.
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(every (@ (srfi srfi-1) every))
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(format (@ (ice-9 format) format)))
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(let loop ((attempts 0))
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(unless (every file-exists? sources)
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(when (> attempts 20)
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(error "RAID devices did not show up; bailing out"
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sources))
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;; XXX: We're not at the top level here. We could use a
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;; non-top-level 'use-modules' form but that doesn't work when the
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;; code is eval'd, like the Shepherd does.
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(every (@ (srfi srfi-1) every))
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(format (@ (ice-9 format) format)))
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(let loop ((attempts 0))
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(unless (every file-exists? sources)
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(when (> attempts 20)
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(error "RAID devices did not show up; bailing out"
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sources))
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(format #t "waiting for RAID source devices~{ ~a~}...~%"
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sources)
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(sleep 1)
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(loop (+ 1 attempts))))
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(format #t "waiting for RAID source devices~{ ~a~}...~%"
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sources)
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(sleep 1)
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(loop (+ 1 attempts))))
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;; Use 'mdadm-static' rather than 'mdadm' to avoid pulling its whole
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;; closure (80 MiB) in the initrd when a RAID device is needed for boot.
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(zero? (apply system* #$(file-append mdadm-static "/sbin/mdadm")
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"--assemble" #$target sources))))
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;; Use 'mdadm-static' rather than 'mdadm' to avoid pulling its whole
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;; closure (80 MiB) in the initrd when a RAID device is needed for boot.
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(zero? (apply system* #$(file-append mdadm-static "/sbin/mdadm")
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"--assemble" #$target sources))))))
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(define (close-raid-device sources target)
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(define (close-raid-device sources targets)
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"Return a gexp that stops the RAID device TARGET."
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#~(zero? (system* #$(file-append mdadm-static "/sbin/mdadm")
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"--stop" #$target)))
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(match targets
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((target)
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#~(zero? (system* #$(file-append mdadm-static "/sbin/mdadm")
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"--stop" #$target)))))
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(define raid-device-mapping
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;; The type of RAID mapped devices.
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