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vm: Modularize build-side code. 

* guix/build/install.scm (install-grub): Call 'error' if 'system*'
  returns non-zero.
* guix/build/vm.scm (initialize-partition-table): Make 'partition-size'
  a positional parameter.  Call 'error' when 'system*' returns
  non-zero'.
  (format-partition, initialize-root-partition): New procedures.
  (initialize-hard-disk): Use them.
This commit is contained in:
Ludovic Courtès 2014-05-21 23:31:46 +02:00
parent d1f477199d
commit 641f9a2a1f
2 changed files with 64 additions and 48 deletions
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10
guix/build/install.scm
View File

@ -37,7 +37,7 @@
(define* (install-grub grub.cfg device mount-point)
"Install GRUB with GRUB.CFG on DEVICE, which is assumed to be mounted on
MOUNT-POINT. Return #t on success."
MOUNT-POINT."
(let* ((target (string-append mount-point "/boot/grub/grub.cfg"))
(pivot (string-append target ".new")))
(mkdir-p (dirname target))
@ -47,9 +47,11 @@ MOUNT-POINT. Return #t on success."
(copy-file grub.cfg pivot)
(rename-file pivot target)
(zero? (system* "grub-install" "--no-floppy"
"--boot-directory" (string-append mount-point "/boot")
device))))
(unless (zero? (system* "grub-install" "--no-floppy"
"--boot-directory"
(string-append mount-point "/boot")
device))
(error "failed to install GRUB"))))
(define (evaluate-populate-directive directive target)
"Evaluate DIRECTIVE, an sexp describing a file or directory to create under

102
guix/build/vm.scm
View File

@ -25,6 +25,9 @@
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:export (load-in-linux-vm
format-partition
initialize-root-partition
initialize-partition-table
initialize-hard-disk))
;;; Commentary:
@ -113,16 +116,20 @@ The data at PORT is the format produced by #:references-graphs."
(loop (read-line port)
result)))))
(define* (initialize-partition-table device
(define* (initialize-partition-table device partition-size
#:key
(label-type "msdos")
partition-size)
(offset (expt 2 20)))
"Create on DEVICE a partition table of type LABEL-TYPE, with a single
partition of PARTITION-SIZE MiB. Return #t on success."
(display "creating partition table...\n")
(zero? (system* "parted" device "mklabel" label-type
"mkpart" "primary" "ext2" "1MiB"
(format #f "~aB" partition-size))))
partition of PARTITION-SIZE bytes starting at OFFSET bytes. Return #t on
success."
(format #t "creating partition table with a ~a B partition...\n"
partition-size)
(unless (zero? (system* "parted" device "mklabel" label-type
"mkpart" "primary" "ext2"
(format #f "~aB" offset)
(format #f "~aB" partition-size)))
(error "failed to create partition table")))
(define* (populate-store reference-graphs target)
"Populate the store under directory TARGET with the items specified in
@ -146,43 +153,19 @@ REFERENCE-GRAPHS, a list of reference-graph files."
(define MS_BIND 4096) ; <sys/mounts.h> again!
(define* (initialize-hard-disk device
#:key
grub.cfg
disk-image-size
(file-system-type "ext4")
(closures '())
copy-closures?
(register-closures? #t)
(directives '()))
"Initialize DEVICE, a disk of DISK-IMAGE-SIZE bytes, with a
FILE-SYSTEM-TYPE partition, and with GRUB installed. If REGISTER-CLOSURES? is
true, register all of CLOSURES is the partition's store. If COPY-CLOSURES? is
true, copy all of CLOSURES to the partition. Lastly, apply DIRECTIVES to
further populate the partition."
(define target-directory
"/fs")
(define (format-partition partition type)
"Create a file system TYPE on PARTITION."
(format #t "creating ~a partition...\n" type)
(unless (zero? (system* (string-append "mkfs." type) "-F" partition))
(error "failed to create partition")))
(define* (initialize-root-partition target-directory
#:key copy-closures? register-closures?
closures)
"Initialize the root partition mounted at TARGET-DIRECTORY."
(define target-store
(string-append target-directory (%store-directory)))
(define partition
(string-append device "1"))
(unless (initialize-partition-table device
#:partition-size
(- disk-image-size (* 5 (expt 2 20))))
(error "failed to create partition table"))
(format #t "creating ~a partition...\n" file-system-type)
(unless (zero? (system* (string-append "mkfs." file-system-type)
"-F" partition))
(error "failed to create partition"))
(display "mounting partition...\n")
(mkdir target-directory)
(mount partition target-directory file-system-type)
(when copy-closures?
;; Populate the store.
(populate-store (map (cut string-append "/xchg/" <>) closures)
@ -207,12 +190,43 @@ further populate the partition."
(unless copy-closures?
(system* "umount" target-store)))
;; Evaluate the POPULATE directives.
;; Add the non-store directories and files.
(display "populating...\n")
(populate-root-file-system target-directory)
(populate-root-file-system target-directory))
(unless (install-grub grub.cfg device target-directory)
(error "failed to install GRUB"))
(define* (initialize-hard-disk device
#:key
grub.cfg
disk-image-size
(file-system-type "ext4")
(closures '())
copy-closures?
(register-closures? #t))
"Initialize DEVICE, a disk of DISK-IMAGE-SIZE bytes, with a
FILE-SYSTEM-TYPE partition, and with GRUB installed. If REGISTER-CLOSURES? is
true, register all of CLOSURES is the partition's store. If COPY-CLOSURES? is
true, copy all of CLOSURES to the partition."
(define target-directory
"/fs")
(define partition
(string-append device "1"))
(initialize-partition-table device
(- disk-image-size (* 5 (expt 2 20))))
(format-partition partition file-system-type)
(display "mounting partition...\n")
(mkdir target-directory)
(mount partition target-directory file-system-type)
(initialize-root-partition target-directory
#:copy-closures? copy-closures?
#:register-closures? register-closures?
#:closures closures)
(install-grub grub.cfg device target-directory)
;; 'guix-register' resets timestamps and everything, so no need to do it
;; once more in that case.