linux-command-line
make-essential-device-nodes
configure-qemu-networking
- mount-qemu-smb-share
- mount-qemu-9p
+ mount-file-system
bind-mount
load-linux-module*
device-number
(logand (network-interface-flags sock interface) IFF_UP)))
-(define (mount-qemu-smb-share share mount-point)
- "Mount QEMU's CIFS/SMB SHARE at MOUNT-POINT.
-
-Vanilla QEMU's `-smb' option just exports a /qemu share, whereas our
-`qemu-with-multiple-smb-shares' package exports the /xchg and /store shares
- (the latter allows the store to be shared between the host and guest.)"
-
- (format #t "mounting QEMU's SMB share `~a'...\n" share)
- (let ((server "10.0.2.4"))
- (mount (string-append "//" server share) mount-point "cifs" 0
- (string->pointer "guest,sec=none"))))
-
-(define (mount-qemu-9p source mount-point)
- "Mount QEMU's 9p file system from SOURCE at MOUNT-POINT.
-
-This uses the 'virtio' transport, which requires the various virtio Linux
-modules to be loaded."
-
- (format #t "mounting QEMU's 9p share '~a'...\n" source)
- (let ((server "10.0.2.4"))
- (mount source mount-point "9p" 0
- (string->pointer "trans=virtio"))))
+;; Linux mount flags, from libc's <sys/mount.h>.
+(define MS_RDONLY 1)
+(define MS_BIND 4096)
(define (bind-mount source target)
"Bind-mount SOURCE at TARGET."
- (define MS_BIND 4096) ; from libc's <sys/mount.h>
-
(mount source target "" MS_BIND))
(define (load-linux-module* file)
the last argument of `mknod'."
(+ (* major 256) minor))
+(define* (mount-root-file-system root type
+ #:key volatile-root? unionfs)
+ "Mount the root file system of type TYPE at device ROOT. If VOLATILE-ROOT?
+is true, mount ROOT read-only and make it a union with a writable tmpfs using
+UNIONFS."
+ (catch #t
+ (lambda ()
+ (if volatile-root?
+ (begin
+ (mkdir-p "/real-root")
+ (mount root "/real-root" type MS_RDONLY)
+ (mkdir-p "/rw-root")
+ (mount "none" "/rw-root" "tmpfs")
+
+ ;; We want read-write /dev nodes.
+ (make-essential-device-nodes #:root "/rw-root")
+
+ ;; Make /root a union of the tmpfs and the actual root.
+ (unless (zero? (system* unionfs "-o"
+ "cow,allow_other,use_ino,suid,dev"
+ "/rw-root=RW:/real-root=RO"
+ "/root"))
+ (error "unionfs failed")))
+ (mount root "/root" "ext3")))
+ (lambda args
+ (format (current-error-port) "exception while mounting '~a': ~s~%"
+ root args)
+ (start-repl))))
+
+(define* (mount-file-system spec #:key (root "/root"))
+ "Mount the file system described by SPEC under ROOT. SPEC must have the
+form:
+
+ (DEVICE MOUNT-POINT TYPE (FLAGS ...) OPTIONS)
+
+DEVICE, MOUNT-POINT, and TYPE must be strings; OPTIONS can be a string or #f;
+FLAGS must be a list of symbols."
+ (define flags->bit-mask
+ (match-lambda
+ (('read-only rest ...)
+ (or MS_RDONLY (flags->bit-mask rest)))
+ (('bind-mount rest ...)
+ (or MS_BIND (flags->bit-mask rest)))
+ (()
+ 0)))
+
+ (match spec
+ ((source mount-point type (flags ...) options)
+ (let ((mount-point (string-append root "/" mount-point)))
+ (mkdir-p mount-point)
+ (mount source mount-point type (flags->bit-mask flags)
+ (if options
+ (string->pointer options)
+ %null-pointer))))))
+
(define* (boot-system #:key
(linux-modules '())
qemu-guest-networking?
guile-modules-in-chroot?
volatile-root? unionfs
+ (root-fs-type "ext3")
(mounts '()))
"This procedure is meant to be called from an initrd. Boot a system by
first loading LINUX-MODULES, then setting up QEMU guest networking if
and finally booting into the new root if any. The initrd supports kernel
command-line options '--load', '--root', and '--repl'.
-MOUNTS must be a list of elements of the form:
-
- (FILE-SYSTEM-TYPE SOURCE TARGET)
+MOUNTS must be a list suitable for 'mount-file-system'.
When GUILE-MODULES-IN-CHROOT? is true, make core Guile modules available in
the new root.
(resolve (string-append "/root" target)))
file)))
- (define MS_RDONLY 1)
-
(display "Welcome, this is GNU's early boot Guile.\n")
(display "Use '--repl' for an initrd REPL.\n\n")
(unless (file-exists? "/root")
(mkdir "/root"))
(if root
- (catch #t
- (lambda ()
- (if volatile-root?
- (begin
- (mkdir-p "/real-root")
- (mount root "/real-root" "ext3" MS_RDONLY)
- (mkdir-p "/rw-root")
- (mount "none" "/rw-root" "tmpfs")
-
- ;; We want read-write /dev nodes.
- (make-essential-device-nodes #:root "/rw-root")
-
- ;; Make /root a union of the tmpfs and the actual root.
- (unless (zero? (system* unionfs "-o"
- "cow,allow_other,use_ino,suid,dev"
- "/rw-root=RW:/real-root=RO"
- "/root"))
- (error "unionfs failed")))
- (mount root "/root" "ext3")))
- (lambda args
- (format (current-error-port) "exception while mounting '~a': ~s~%"
- root args)
- (start-repl)))
+ (mount-root-file-system root root-fs-type
+ #:volatile-root? volatile-root?
+ #:unionfs unionfs)
(mount "none" "/root" "tmpfs"))
(mount-essential-file-systems #:root "/root")
(make-essential-device-nodes #:root "/root"))
;; Mount the specified file systems.
- (for-each (match-lambda
- (('cifs source target)
- (let ((target (string-append "/root/" target)))
- (mkdir-p target)
- (mount-qemu-smb-share source target)))
- (('9p source target)
- (let ((target (string-append "/root/" target)))
- (mkdir-p target)
- (mount-qemu-9p source target))))
- mounts)
+ (for-each mount-file-system mounts)
(when guile-modules-in-chroot?
;; Copy the directories that contain .scm and .go files so that the
HCoop / jackhill / guix / guix.git / blobdiff