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system: Add support for boot-time mapped devices.

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* gnu/build/linux-boot.scm (boot-system): Add #:pre-mount parameter and
  honor it.
* gnu/system/linux-initrd.scm (base-initrd): Add #:mapped-devices
  parameter.  Add 'device-mapping-commands' variable, and use it to
  build the #:pre-mount argument of 'boot-system'.
* gnu/system.scm (mapped-device-user,
  operating-system-user-mapped-devices,
  operating-system-boot-mapped-devices): New procedures.
  (device-mapping-services): Use 'operating-system-user-mapped-devices'
  instead of 'operating-system-mapped-devices'.
  (operating-system-initrd-file): Call the initrd with #:mapped-devices.
This commit is contained in:
Ludovic Courtès 2014-09-22 11:06:42 +02:00
parent e2b464b7f4
commit de1c158f32
3 changed files with 61 additions and 9 deletions
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12
gnu/build/linux-boot.scm
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@ -340,13 +340,14 @@ bailing out.~%root contents: ~s~%" (scandir "/"))
(linux-modules '())
qemu-guest-networking?
volatile-root?
pre-mount
(mounts '()))
"This procedure is meant to be called from an initrd. Boot a system by
first loading LINUX-MODULES (a list of absolute file names of '.ko' files),
then setting up QEMU guest networking if QEMU-GUEST-NETWORKING? is true,
mounting the file systems specified in MOUNTS, and finally booting into the
new root if any. The initrd supports kernel command-line options '--load',
'--root', and '--repl'.
calling PRE-MOUNT, mounting the file systems specified in MOUNTS, and finally
booting into the new root if any. The initrd supports kernel command-line
options '--load', '--root', and '--repl'.
Mount the root file system, specified by the '--root' command-line argument,
if any.
@ -403,6 +404,11 @@ to it are lost."
(mkdir "/root/dev")
(make-essential-device-nodes #:root "/root"))
(when (procedure? pre-mount)
;; Do whatever actions are needed before mounting--e.g., installing
;; device mappings.
(pre-mount))
;; Mount the specified file systems.
(for-each mount-file-system
(remove root-mount-point? mounts))