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linux-initrd: Rewrite using gexps. 

* gnu/system/linux-initrd.scm (expression->initrd): Rename 'inputs'
  parameter to 'to-copy'.  Remove 'files-to-copy'.  Rewrite 'builder' as
  a gexp, and use 'gexp->derivation'.
  (qemu-initrd): Adjust accordingly.
This commit is contained in:
Ludovic Courtès 2014-04-27 23:06:15 +02:00
parent 8c35bfb68c
commit 0c21d92b1c
1 changed files with 137 additions and 161 deletions
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298
gnu/system/linux-initrd.scm
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@ -18,6 +18,7 @@
(define-module (gnu system linux-initrd)
#:use-module (guix monads)
#:use-module (guix gexp)
#:use-module (guix utils)
#:use-module ((guix store)
#:select (%store-prefix))
@ -52,14 +53,14 @@
(name "guile-initrd")
(system (%current-system))
(modules '())
(inputs '())
(to-copy '())
(linux #f)
(linux-modules '()))
"Return a package that contains a Linux initrd (a gzipped cpio archive)
containing GUILE and that evaluates EXP upon booting. LINUX-MODULES is a list
of `.ko' file names to be copied from LINUX into the initrd. INPUTS is a list
of additional inputs to be copied in the initrd. MODULES is a list of Guile
module names to be embedded in the initrd."
of `.ko' file names to be copied from LINUX into the initrd. TO-COPY is a
list of additional derivations or packages to copy to the initrd. MODULES is
a list of Guile module names to be embedded in the initrd."
;; General Linux overview in `Documentation/early-userspace/README' and
;; `Documentation/filesystems/ramfs-rootfs-initramfs.txt'.
@ -68,154 +69,129 @@ module names to be embedded in the initrd."
;; Return a regexp that matches STR exactly.
(string-append "^" (regexp-quote str) "$"))
(define (files-to-copy)
(mlet %store-monad ((inputs (lower-inputs inputs)))
(return (map (match-lambda
((_ drv)
(derivation->output-path drv))
((_ drv sub-drv)
(derivation->output-path drv sub-drv)))
inputs))))
(mlet* %store-monad ((source (imported-modules modules))
(compiled (compiled-modules modules)))
(define builder
;; TODO: Move most of this code to (guix build linux-initrd).
#~(begin
(use-modules (guix build utils)
(ice-9 pretty-print)
(ice-9 popen)
(ice-9 match)
(ice-9 ftw)
(srfi srfi-26)
(system base compile)
(rnrs bytevectors)
((system foreign) #:select (sizeof)))
(define (builder to-copy)
`(begin
(use-modules (guix build utils)
(ice-9 pretty-print)
(ice-9 popen)
(ice-9 match)
(ice-9 ftw)
(srfi srfi-26)
(system base compile)
(rnrs bytevectors)
((system foreign) #:select (sizeof)))
(let ((cpio (string-append #$cpio "/bin/cpio"))
(gzip (string-append #$gzip "/bin/gzip"))
(modules #$source)
(gos #$compiled)
(scm-dir (string-append "share/guile/" (effective-version)))
(go-dir (format #f ".cache/guile/ccache/~a-~a-~a-~a"
(effective-version)
(if (eq? (native-endianness) (endianness little))
"LE"
"BE")
(sizeof '*)
(effective-version))))
(mkdir #$output)
(mkdir "contents")
(with-directory-excursion "contents"
(copy-recursively #$guile ".")
(call-with-output-file "init"
(lambda (p)
(format p "#!/bin/guile -ds~%!#~%" #$guile)
(pretty-print '#$exp p)))
(chmod "init" #o555)
(chmod "bin/guile" #o555)
(let ((guile (assoc-ref %build-inputs "guile"))
(cpio (string-append (assoc-ref %build-inputs "cpio")
"/bin/cpio"))
(gzip (string-append (assoc-ref %build-inputs "gzip")
"/bin/gzip"))
(modules (assoc-ref %build-inputs "modules"))
(gos (assoc-ref %build-inputs "modules/compiled"))
(scm-dir (string-append "share/guile/" (effective-version)))
(go-dir (format #f ".cache/guile/ccache/~a-~a-~a-~a"
(effective-version)
(if (eq? (native-endianness) (endianness little))
"LE"
"BE")
(sizeof '*)
(effective-version)))
(out (assoc-ref %outputs "out")))
(mkdir out)
(mkdir "contents")
(with-directory-excursion "contents"
(copy-recursively guile ".")
(call-with-output-file "init"
(lambda (p)
(format p "#!/bin/guile -ds~%!#~%" guile)
(pretty-print ',exp p)))
(chmod "init" #o555)
(chmod "bin/guile" #o555)
;; Copy Guile modules.
(chmod scm-dir #o777)
(copy-recursively modules scm-dir
#:follow-symlinks? #t)
(copy-recursively gos (string-append "lib/guile/"
(effective-version) "/ccache")
#:follow-symlinks? #t)
;; Copy Guile modules.
(chmod scm-dir #o777)
(copy-recursively modules scm-dir
#:follow-symlinks? #t)
(copy-recursively gos (string-append "lib/guile/"
(effective-version) "/ccache")
#:follow-symlinks? #t)
;; Compile `init'.
(mkdir-p go-dir)
(set! %load-path (cons modules %load-path))
(set! %load-compiled-path (cons gos %load-compiled-path))
(compile-file "init"
#:opts %auto-compilation-options
#:output-file (string-append go-dir "/init.go"))
;; Compile `init'.
(mkdir-p go-dir)
(set! %load-path (cons modules %load-path))
(set! %load-compiled-path (cons gos %load-compiled-path))
(compile-file "init"
#:opts %auto-compilation-options
#:output-file (string-append go-dir "/init.go"))
;; Copy Linux modules.
(let* ((linux #$linux)
(module-dir (and linux
(string-append linux "/lib/modules"))))
(mkdir "modules")
#$@(map (lambda (module)
#~(match (find-files module-dir
#$(string->regexp module))
((file)
(format #t "copying '~a'...~%" file)
(copy-file file (string-append "modules/"
#$module)))
(()
(error "module not found" #$module module-dir))
((_ ...)
(error "several modules by that name"
#$module module-dir))))
linux-modules))
;; Copy Linux modules.
(let* ((linux (assoc-ref %build-inputs "linux"))
(module-dir (and linux
(string-append linux "/lib/modules"))))
(mkdir "modules")
,@(map (lambda (module)
`(match (find-files module-dir
,(string->regexp module))
((file)
(format #t "copying '~a'...~%" file)
(copy-file file (string-append "modules/"
,module)))
(()
(error "module not found" ,module module-dir))
((_ ...)
(error "several modules by that name"
,module module-dir))))
linux-modules))
(let ((store #$(string-append "." (%store-prefix)))
(to-copy '#$to-copy))
(unless (null? to-copy)
(mkdir-p store))
;; XXX: Should we do export-references-graph?
(for-each (lambda (input)
(let ((target
(string-append store "/"
(basename input))))
(copy-recursively input target)))
to-copy))
,@(if (null? to-copy)
'()
`((let ((store ,(string-append "." (%store-prefix))))
(mkdir-p store)
;; XXX: Should we do export-references-graph?
(for-each (lambda (input)
(let ((target
(string-append store "/"
(basename input))))
(copy-recursively input target)))
',to-copy))))
;; Reset the timestamps of all the files that will make it in the
;; initrd.
(for-each (cut utime <> 0 0 0 0)
(find-files "." ".*"))
;; Reset the timestamps of all the files that will make it in the
;; initrd.
(for-each (cut utime <> 0 0 0 0)
(find-files "." ".*"))
(system* cpio "--version")
(let ((pipe (open-pipe* OPEN_WRITE cpio "-o"
"-O" (string-append #$output "/initrd")
"-H" "newc" "--null")))
(define print0
(let ((len (string-length "./")))
(lambda (file)
(format pipe "~a\0" (string-drop file len)))))
(system* cpio "--version")
(let ((pipe (open-pipe* OPEN_WRITE cpio "-o"
"-O" (string-append out "/initrd")
"-H" "newc" "--null")))
(define print0
(let ((len (string-length "./")))
(lambda (file)
(format pipe "~a\0" (string-drop file len)))))
;; Note: as per `ramfs-rootfs-initramfs.txt', always add
;; directory entries before the files that are inside of it: "The
;; Linux kernel cpio extractor won't create files in a directory
;; that doesn't exist, so the directory entries must go before
;; the files that go in those directories."
(file-system-fold (const #t)
(lambda (file stat result) ; leaf
(print0 file))
(lambda (dir stat result) ; down
(unless (string=? dir ".")
(print0 dir)))
(const #f) ; up
(const #f) ; skip
(const #f)
#f
".")
;; Note: as per `ramfs-rootfs-initramfs.txt', always add
;; directory entries before the files that are inside of it: "The
;; Linux kernel cpio extractor won't create files in a directory
;; that doesn't exist, so the directory entries must go before
;; the files that go in those directories."
(file-system-fold (const #t)
(lambda (file stat result) ; leaf
(print0 file))
(lambda (dir stat result) ; down
(unless (string=? dir ".")
(print0 dir)))
(const #f) ; up
(const #f) ; skip
(const #f)
#f
".")
(and (zero? (close-pipe pipe))
(with-directory-excursion #$output
(and (zero? (system* gzip "--best" "initrd"))
(rename-file "initrd.gz" "initrd")))))))))
(and (zero? (close-pipe pipe))
(with-directory-excursion out
(and (zero? (system* gzip "--best" "initrd"))
(rename-file "initrd.gz" "initrd")))))))))
(mlet* %store-monad
((source (imported-modules modules))
(compiled (compiled-modules modules))
(inputs (lower-inputs
`(("guile" ,guile)
("cpio" ,cpio)
("gzip" ,gzip)
("modules" ,source)
("modules/compiled" ,compiled)
,@(if linux
`(("linux" ,linux))
'())
,@inputs)))
(to-copy (files-to-copy)))
(derivation-expression name (builder to-copy)
#:modules '((guix build utils))
#:inputs inputs)))
(gexp->derivation name builder
#:modules '((guix build utils)))))
(define* (qemu-initrd #:key
guile-modules-in-chroot?
@ -257,26 +233,26 @@ to it are lost."
'("fuse.ko")
'())))
(mlet %store-monad
((unionfs (package-file unionfs-fuse/static "bin/unionfs")))
(expression->initrd
`(begin
(use-modules (guix build linux-initrd))
(expression->initrd
#~(begin
(use-modules (guix build linux-initrd)
(srfi srfi-26))
(boot-system #:mounts ',mounts
#:linux-modules ',linux-modules
#:qemu-guest-networking? #t
#:guile-modules-in-chroot? ',guile-modules-in-chroot?
#:unionfs ,unionfs
#:volatile-root? ',volatile-root?))
#:name "qemu-initrd"
#:modules '((guix build utils)
(guix build linux-initrd))
#:linux linux-libre
#:linux-modules linux-modules
#:inputs (if volatile-root?
`(("unionfs" ,unionfs-fuse/static))
'()))))
(boot-system #:mounts '#$mounts
#:linux-modules '#$linux-modules
#:qemu-guest-networking? #t
#:guile-modules-in-chroot? '#$guile-modules-in-chroot?
#:unionfs (and=> #$(and volatile-root? unionfs-fuse/static)
(cut string-append <> "/bin/unionfs"))
#:volatile-root? '#$volatile-root?))
#:name "qemu-initrd"
#:modules '((guix build utils)
(guix build linux-initrd))
#:to-copy (if volatile-root?
(list unionfs-fuse/static)
'())
#:linux linux-libre
#:linux-modules linux-modules))
(define (gnu-system-initrd)
"Initrd for the GNU system itself, with nothing QEMU-specific."