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gnu: vm: Rewrite helper functions as monadic functions. 

* gnu/system/dmd.scm (host-name-service, nscd-service, mingetty-service,
  syslog-service, guix-service, static-networking-service): Rewrite as
  monadic functions.
  (dmd-configuration-file): Use 'text-file' instead of
  'add-text-to-store'.
* gnu/system/grub.scm (grub-configuration-file): Rewrite as a monadic
  function.
* gnu/system/linux.scm (pam-services->directory): Likewise.
* gnu/system/shadow.scm (group-file, passwd-file, guix-build-accounts):
  Likewise.
* gnu/system/vm.scm (expression->derivation-in-linux-vm, qemu-image,
  union, system-qemu-image): Likewise.
master
Ludovic Courtès 2013-10-03 21:30:30 +02:00
parent b860f38244
commit d9f0a23704
5 changed files with 525 additions and 523 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

68
gnu/system/dmd.scm
View File

@ -31,6 +31,7 @@
#:select (net-tools))
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (guix monads)
#:export (service?
service
service-provision
@ -69,19 +70,19 @@
(inputs service-inputs ; list of inputs
(default '())))
(define (host-name-service store name)
(define (host-name-service name)
"Return a service that sets the host name to NAME."
(service
(with-monad %store-monad
(return (service
(provision '(host-name))
(start `(lambda _
(sethostname ,name)))
(respawn? #f)))
(respawn? #f)))))
(define (mingetty-service store tty)
(define (mingetty-service tty)
"Return a service to run mingetty on TTY."
(let* ((mingetty-drv (package-derivation store mingetty))
(mingetty-bin (string-append (derivation->output-path mingetty-drv)
"/sbin/mingetty")))
(mlet %store-monad ((mingetty-bin (package-file mingetty "sbin/mingetty")))
(return
(service
(provision (list (symbol-append 'term- (string->symbol tty))))
@ -90,13 +91,12 @@
(requirement '(host-name))
(start `(make-forkexec-constructor ,mingetty-bin "--noclear" ,tty))
(inputs `(("mingetty" ,mingetty))))))
(inputs `(("mingetty" ,mingetty)))))))
(define* (nscd-service store
#:key (glibc glibc-final))
(define* (nscd-service #:key (glibc glibc-final))
"Return a service that runs libc's name service cache daemon (nscd)."
(let ((nscd (string-append (package-output store glibc) "/sbin/nscd")))
(service
(mlet %store-monad ((nscd (package-file glibc "sbin/nscd")))
(return (service
(provision '(nscd))
(start `(make-forkexec-constructor ,nscd "-f" "/dev/null"))
@ -108,14 +108,13 @@
#f)))
(respawn? #f)
(inputs `(("glibc" ,glibc))))))
(inputs `(("glibc" ,glibc)))))))
(define (syslog-service store)
(define (syslog-service)
"Return a service that runs 'syslogd' with reasonable default settings."
(define syslog.conf
;; Snippet adapted from the GNU inetutils manual.
(add-text-to-store store "syslog.conf" "
(define contents "
# Log all kernel messages, authentication messages of
# level notice or higher and anything of level err or
# higher to the console.
@ -134,31 +133,30 @@
# Log all the mail messages in one place.
mail.* /var/log/maillog
"))
")
(let* ((inetutils-drv (package-derivation store inetutils))
(syslogd (string-append (derivation->output-path inetutils-drv)
"/libexec/syslogd")))
(mlet %store-monad
((syslog.conf (text-file "syslog.conf" contents))
(syslogd (package-file inetutils "libexec/syslogd")))
(return
(service
(provision '(syslogd))
(start `(make-forkexec-constructor ,syslogd
"--rcfile" ,syslog.conf))
(inputs `(("inetutils" ,inetutils)
("syslog.conf" ,syslog.conf))))))
("syslog.conf" ,syslog.conf)))))))
(define* (guix-service store #:key (guix guix) (builder-group "guixbuild"))
(define* (guix-service #:key (guix guix) (builder-group "guixbuild"))
"Return a service that runs the build daemon from GUIX."
(let* ((drv (package-derivation store guix))
(daemon (string-append (derivation->output-path drv)
"/bin/guix-daemon")))
(service
(mlet %store-monad ((daemon (package-file guix "bin/guix-daemon")))
(return (service
(provision '(guix-daemon))
(start `(make-forkexec-constructor ,daemon
"--build-users-group"
,builder-group))
(inputs `(("guix" ,guix))))))
(inputs `(("guix" ,guix)))))))
(define* (static-networking-service store interface ip
(define* (static-networking-service interface ip
#:key
gateway
(inetutils inetutils)
@ -169,10 +167,9 @@ true, it must be a string specifying the default network gateway."
;; TODO: Eventually we should do this using Guile's networking procedures,
;; like 'configure-qemu-networking' does, but the patch that does this is
;; not yet in stock Guile.
(let ((ifconfig (string-append (package-output store inetutils)
"/bin/ifconfig"))
(route (string-append (package-output store net-tools)
"/sbin/route")))
(mlet %store-monad ((ifconfig (package-file inetutils "bin/ifconfig"))
(route (package-file net-tools "sbin/route")))
(return
(service
(provision '(networking))
(start `(lambda _
@ -190,10 +187,10 @@ true, it must be a string specifying the default network gateway."
(inputs `(("inetutils" ,inetutils)
,@(if gateway
`(("net-tools" ,net-tools))
'()))))))
'())))))))
(define (dmd-configuration-file store services)
(define (dmd-configuration-file services)
"Return the dmd configuration file for SERVICES."
(define config
`(begin
@ -209,7 +206,6 @@ true, it must be a string specifying the default network gateway."
services))
(for-each start ',(append-map service-provision services))))
(add-text-to-store store "dmd.conf"
(object->string config)))
(text-file "dmd.conf" (object->string config)))
;;; dmd.scm ends here

47
gnu/system/grub.scm
View File

@ -21,6 +21,7 @@
#:use-module (guix packages)
#:use-module (guix derivations)
#:use-module (guix records)
#:use-module (guix monads)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:export (menu-entry
@ -42,43 +43,45 @@
(default '()))
(initrd menu-entry-initrd))
(define* (grub-configuration-file store entries
(define* (grub-configuration-file entries
#:key (default-entry 1) (timeout 5)
(system (%current-system)))
"Return the GRUB configuration file in STORE for ENTRIES, a list of
"Return the GRUB configuration file for ENTRIES, a list of
<menu-entry> objects, defaulting to DEFAULT-ENTRY and with the given TIMEOUT."
(define prologue
(define (prologue kernel)
(format #f "
set default=~a
set timeout=~a
search.file ~a~%"
default-entry timeout
(any (match-lambda
default-entry timeout kernel))
(define (bzImage)
(anym %store-monad
(match-lambda
(($ <menu-entry> _ linux)
(let* ((drv (package-derivation store linux system))
(out (derivation->output-path drv)))
(string-append out "/bzImage"))))
entries)))
(package-file linux "bzImage"
#:system system)))
entries))
(define entry->text
(match-lambda
(($ <menu-entry> label linux arguments initrd)
(let ((linux-drv (package-derivation store linux system))
(initrd-drv (package-derivation store initrd system)))
(mlet %store-monad ((linux (package-file linux "bzImage"
#:system system))
(initrd (package-file initrd "initrd"
#:system system)))
;; XXX: Assume that INITRD is a directory containing an 'initrd' file.
(format #f "menuentry ~s {
linux ~a/bzImage ~a
initrd ~a/initrd
(return (format #f "menuentry ~s {
linux ~a ~a
initrd ~a
}~%"
label
(derivation->output-path linux-drv)
(string-join arguments)
(derivation->output-path initrd-drv))))))
linux (string-join arguments) initrd))))))
(add-text-to-store store "grub.cfg"
(string-append prologue
(string-concatenate
(map entry->text entries)))
'()))
(mlet %store-monad ((kernel (bzImage))
(body (mapm %store-monad entry->text entries)))
(text-file "grub.cfg"
(string-append (prologue kernel)
(string-concatenate body)))))
;;; grub.scm ends here

22
gnu/system/linux.scm
View File

@ -20,6 +20,7 @@
#:use-module (guix store)
#:use-module (guix records)
#:use-module (guix derivations)
#:use-module (guix monads)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
@ -81,17 +82,20 @@
(map (cut entry->string "password" <>) password)
(map (cut entry->string "session" <>) session))))))
(define (pam-services->directory store services)
(define (pam-services->directory services)
"Return the derivation to build the configuration directory to be used as
/etc/pam.d for SERVICES."
(let ((names (map pam-service-name services))
(files (map (match-lambda
(mlet %store-monad
((names -> (map pam-service-name services))
(files (mapm %store-monad
(match-lambda
((and service ($ <pam-service> name))
(let ((config (pam-service->configuration service)))
(add-text-to-store store
(string-append name ".pam")
config '()))))
services)))
(text-file (string-append name ".pam") config))))
;; XXX: Eventually, SERVICES may be a list of monadic
;; values instead of plain values.
(map return services))))
(define builder
'(begin
(use-modules (ice-9 match))
@ -104,9 +108,7 @@
%build-inputs)
#t)))
(build-expression->derivation store "pam.d" (%current-system)
builder
(zip names files))))
(derivation-expression "pam.d" (%current-system) builder (zip names files))))
(define %pam-other-services
;; The "other" PAM configuration, which denies everything (see

20
gnu/system/shadow.scm
View File

@ -20,6 +20,7 @@
#:use-module (guix store)
#:use-module (guix records)
#:use-module (guix packages)
#:use-module (guix monads)
#:use-module ((gnu packages system)
#:select (shadow))
#:use-module (srfi srfi-1)
@ -72,7 +73,7 @@
(id user-group-id)
(members user-group-members (default '())))
(define (group-file store groups)
(define (group-file groups)
"Return a /etc/group file for GROUPS, a list of <user-group> objects."
(define contents
(let loop ((groups groups)
@ -87,9 +88,9 @@
(()
(string-join (reverse result) "\n" 'suffix)))))
(add-text-to-store store "group" contents))
(text-file "group" contents))
(define* (passwd-file store accounts #:key shadow?)
(define* (passwd-file accounts #:key shadow?)
"Return a password file for ACCOUNTS, a list of <user-account> objects. If
SHADOW? is true, then it is a /etc/shadow file, otherwise it is a /etc/passwd
file."
@ -114,18 +115,17 @@ file."
(()
(string-join (reverse result) "\n" 'suffix)))))
(add-text-to-store store (if shadow? "shadow" "passwd")
contents '()))
(text-file (if shadow? "shadow" "passwd") contents))
(define* (guix-build-accounts store count #:key
(define* (guix-build-accounts count #:key
(first-uid 30001)
(gid 30000)
(shadow shadow))
"Return a list of COUNT user accounts for Guix build users, with UIDs
starting at FIRST-UID, and under GID."
(let* ((gid* gid)
(no-login (string-append (package-output store shadow) "/sbin/nologin")))
(unfold (cut > <> count)
(mlet* %store-monad ((gid* -> gid)
(no-login (package-file shadow "sbin/nologin")))
(return (unfold (cut > <> count)
(lambda (n)
(user-account
(name (format #f "guixbuilder~2,'0d" n))
@ -136,6 +136,6 @@ starting at FIRST-UID, and under GID."
(home-directory "/var/empty")
(shell no-login)))
1+
1)))
1))))
;;; shadow.scm ends here

239
gnu/system/vm.scm
View File

@ -21,6 +21,7 @@
#:use-module (guix store)
#:use-module (guix derivations)
#:use-module (guix packages)
#:use-module (guix monads)
#:use-module ((gnu packages base)
#:select (%final-inputs
guile-final gcc-final glibc-final
@ -58,7 +59,7 @@
;;;
;;; Code:
(define* (expression->derivation-in-linux-vm store name exp
(define* (expression->derivation-in-linux-vm name exp
#:key
(system (%current-system))
(inputs '())
@ -89,23 +90,23 @@ made available under the /xchg CIFS share."
;; `build-expression->derivation'.
(define input-alist
(with-monad %store-monad
(map (match-lambda
((input (? package? package))
`(,input . ,(package-output store package "out" system)))
(mlet %store-monad ((out (package-file package #:system system)))
(return `(,input . ,out))))
((input (? package? package) sub-drv)
`(,input . ,(package-output store package sub-drv system)))
(mlet %store-monad ((out (package-file package
#:output sub-drv
#:system system)))
(return `(,input . ,out))))
((input (? derivation? drv))
`(,input . ,(derivation->output-path drv)))
(return `(,input . ,(derivation->output-path drv))))
((input (? derivation? drv) sub-drv)
`(,input . ,(derivation->output-path drv sub-drv)))
(return `(,input . ,(derivation->output-path drv sub-drv))))
((input (and (? string?) (? store-path?) file))
`(,input . ,file)))
inputs))
(define exp*
;; EXP, but with INPUTS available.
`(let ((%build-inputs ',input-alist))
,exp))
(return `(,input . ,file))))
inputs)))
(define builder
;; Code that launches the VM that evaluates EXP.
@ -167,26 +168,35 @@ made available under the /xchg CIFS share."
(mkdir out)
(copy-recursively "xchg" out)))))))
(let ((user-builder (add-text-to-store store "builder-in-linux-vm"
(object->string exp*)
'()))
(->drv (cut package-derivation store <> system))
(coreutils (car (assoc-ref %final-inputs "coreutils"))))
(build-expression->derivation store name system builder
`(("qemu" ,(->drv qemu))
("linux" ,(->drv linux))
("initrd" ,(->drv initrd))
("coreutils" ,(->drv coreutils))
("builder" ,user-builder)
,@(map (match-lambda
((name (? package? package)
sub-drv ...)
`(,name ,(->drv package)
,@sub-drv))
(define (lower-inputs inputs)
;; Turn any package in INPUTS into a derivation.
(with-monad %store-monad
(sequence %store-monad
(map (match-lambda
((name (? package? package) sub-drv ...)
(mlet %store-monad ((drv (package->derivation package)))
(return `(,name ,drv ,@sub-drv))))
((name (? string? file))
`(,name ,file))
(tuple tuple))
inputs))
(return `(,name ,file)))
(tuple
(return tuple)))
inputs))))
(mlet* %store-monad
((input-alist (sequence %store-monad input-alist))
(exp* -> `(let ((%build-inputs ',input-alist))
,exp))
(user-builder (text-file "builder-in-linux-vm"
(object->string exp*)))
(coreutils -> (car (assoc-ref %final-inputs "coreutils")))
(inputs (lower-inputs `(("qemu" ,qemu)
("linux" ,linux)
("initrd" ,initrd)
("coreutils" ,coreutils)
("builder" ,user-builder)
,@inputs))))
(derivation-expression name system builder inputs
#:env-vars env-vars
#:modules (delete-duplicates
`((guix build utils)
@ -194,7 +204,7 @@ made available under the /xchg CIFS share."
#:guile-for-build guile-for-build
#:references-graphs references-graphs)))
(define* (qemu-image store #:key
(define* (qemu-image #:key
(name "qemu-image")
(system (%current-system))
(disk-image-size (* 100 (expt 2 20)))
@ -215,24 +225,27 @@ POPULATE is a list of directives stating directories or symlinks to be created
in the disk image partition. It is evaluated once the image has been
populated with INPUTS-TO-COPY. It can be used to provide additional files,
such as /etc files."
(define input->name+derivation
(match-lambda
(define (input->name+derivation tuple)
(with-monad %store-monad
(match tuple
((name (? package? package))
`(,name . ,(derivation->output-path
(package-derivation store package system))))
(mlet %store-monad ((drv (package->derivation package system)))
(return `(,name . ,(derivation->output-path drv)))))
((name (? package? package) sub-drv)
`(,name . ,(derivation->output-path
(package-derivation store package system)
sub-drv)))
(mlet %store-monad ((drv (package->derivation package system)))
(return `(,name . ,(derivation->output-path drv sub-drv)))))
((name (? derivation? drv))
`(,name . ,(derivation->output-path drv)))
(return `(,name . ,(derivation->output-path drv))))
((name (? derivation? drv) sub-drv)
`(,name . ,(derivation->output-path drv sub-drv)))
(return `(,name . ,(derivation->output-path drv sub-drv))))
((input (and (? string?) (? store-path?) file))
`(,input . ,file))))
(return `(,input . ,file))))))
(mlet %store-monad
((graph (sequence %store-monad
(map input->name+derivation inputs-to-copy))))
(expression->derivation-in-linux-vm
store "qemu-image"
"qemu-image"
`(let ()
(use-modules (ice-9 rdelim)
(srfi srfi-1)
@ -396,22 +409,22 @@ such as /etc files."
,@inputs-to-copy)
#:make-disk-image? #t
#:disk-image-size disk-image-size
#:references-graphs (map input->name+derivation inputs-to-copy)
#:references-graphs graph
#:modules '((guix build utils)
(guix build linux-initrd))))
(guix build linux-initrd)))))
;;;
;;; Stand-alone VM image.
;;;
(define* (union store inputs
(define* (union inputs
#:key (guile (%guile-for-build)) (system (%current-system))
(name "union"))
"Return a derivation that builds the union of INPUTS. INPUTS is a list of
input tuples."
(define builder
`(begin
'(begin
(use-modules (guix build union))
(setvbuf (current-output-port) _IOLBF)
@ -423,78 +436,72 @@ input tuples."
output (length inputs))
(union-build output inputs))))
(build-expression->derivation store name system builder
(mlet %store-monad
((inputs (sequence %store-monad
(map (match-lambda
((name (? package? p))
`(,name ,(package-derivation store p
system)))
(mlet %store-monad
((drv (package->derivation p system)))
(return `(,name ,drv))))
((name (? package? p) output)
`(,name ,(package-derivation store p
system)
,output))
(x x))
inputs)
(mlet %store-monad
((drv (package->derivation p system)))
(return `(,name ,drv ,output))))
(x
(return x)))
inputs))))
(derivation-expression name system builder
inputs
#:modules '((guix build union))
#:guile-for-build guile))
#:guile-for-build guile)))
(define (system-qemu-image store)
(define (system-qemu-image)
"Return the derivation of a QEMU image of the GNU system."
(define motd
(add-text-to-store store "motd" "
(define build-user-gid 30000)
(mlet* %store-monad
((motd (text-file "motd" "
Happy birthday, GNU! http://www.gnu.org/gnu30
"))
(define %pam-services
(%pam-services ->
;; Services known to PAM.
(list %pam-other-services
(unix-pam-service "login"
#:allow-empty-passwords? #t
#:motd motd)))
(define %dmd-services
;; Services run by dmd.
(list (host-name-service store "gnu")
(mingetty-service store "tty1")
(mingetty-service store "tty2")
(mingetty-service store "tty3")
(mingetty-service store "tty4")
(mingetty-service store "tty5")
(mingetty-service store "tty6")
(syslog-service store)
(guix-service store)
(nscd-service store)
(services (listm %store-monad
(host-name-service "gnu")
(mingetty-service "tty1")
(mingetty-service "tty2")
(mingetty-service "tty3")
(mingetty-service "tty4")
(mingetty-service "tty5")
(mingetty-service "tty6")
(syslog-service)
(guix-service)
(nscd-service)
;; QEMU networking settings.
(static-networking-service store "eth0" "10.0.2.10"
(static-networking-service "eth0" "10.0.2.10"
#:gateway "10.0.2.2")))
(define build-user-gid 30000)
(build-accounts (guix-build-accounts 10 #:gid build-user-gid))
(define build-accounts
(guix-build-accounts store 10 #:gid build-user-gid))
(define resolv.conf
(resolv.conf
;; Name resolution for default QEMU settings.
(add-text-to-store store "resolv.conf"
"nameserver 10.0.2.3\n"))
(text-file "resolv.conf" "nameserver 10.0.2.3\n"))
(define etc-services
(string-append (package-output store net-base) "/etc/services"))
(define etc-protocols
(string-append (package-output store net-base) "/etc/protocols"))
(define etc-rpc
(string-append (package-output store net-base) "/etc/rpc"))
(etc-services (package-file net-base "etc/services"))
(etc-protocols (package-file net-base "etc/protocols"))
(etc-rpc (package-file net-base "etc/rpc"))
(parameterize ((%guile-for-build (package-derivation store guile-final)))
(let* ((bash-drv (package-derivation store bash))
(bash-file (string-append (derivation->output-path bash-drv)
"/bin/bash"))
(dmd-drv (package-derivation store dmd))
(dmd-file (string-append (derivation->output-path dmd-drv)
"/bin/dmd"))
(dmd-conf (dmd-configuration-file store %dmd-services))
(accounts (cons* (user-account
(bash-file (package-file bash "bin/bash"))
(dmd-file (package-file dmd "bin/dmd"))
(dmd-conf (dmd-configuration-file services))
(accounts -> (cons* (user-account
(name "root")
(password "")
(uid 0) (gid 0)
@ -509,10 +516,9 @@ Happy birthday, GNU! http://www.gnu.org/gnu30
(home-directory "/home/guest")
(shell bash-file))
build-accounts))
(passwd (passwd-file store accounts))
(shadow (passwd-file store accounts #:shadow? #t))
(group (group-file store
(list (user-group
(passwd (passwd-file accounts))
(shadow (passwd-file accounts #:shadow? #t))
(group (group-file (list (user-group
(name "root")
(id 0))
(user-group
@ -524,10 +530,10 @@ Happy birthday, GNU! http://www.gnu.org/gnu30
(id build-user-gid)
(members (map user-account-name
build-accounts))))))
(pam.d-drv (pam-services->directory store %pam-services))
(pam.d (derivation->output-path pam.d-drv))
(pam.d-drv (pam-services->directory %pam-services))
(pam.d -> (derivation->output-path pam.d-drv))
(packages `(("coreutils" ,coreutils)
(packages -> `(("coreutils" ,coreutils)
("bash" ,bash)
("guile" ,guile-2.0)
("dmd" ,dmd)
@ -544,11 +550,10 @@ Happy birthday, GNU! http://www.gnu.org/gnu30
;; TODO: Replace with a real profile with a manifest.
;; TODO: Generate bashrc from packages' search-paths.
(profile-drv (union store packages
(profile-drv (union packages
#:name "default-profile"))
(profile (derivation->output-path profile-drv))
(bashrc (add-text-to-store store "bashrc"
(string-append "
(profile -> (derivation->output-path profile-drv))
(bashrc (text-file "bashrc" (string-append "
export PS1='\\u@\\h\\$ '
export PATH=$HOME/.guix-profile/bin:" profile "/bin:" profile "/sbin
export CPATH=$HOME/.guix-profile/include:" profile "/include
@ -557,7 +562,7 @@ alias ls='ls -p --color'
alias ll='ls -l'
")))
(issue (add-text-to-store store "issue" "
(issue (text-file "issue" "
This is an alpha preview of the GNU system. Welcome.
This image features the GNU Guix package manager, which was used to
@ -567,7 +572,7 @@ GNU dmd (http://www.gnu.org/software/dmd/).
You can log in as 'guest' or 'root' with no password.
"))
(populate `((directory "/nix/store" 0 ,build-user-gid)
(populate -> `((directory "/nix/store" 0 ,build-user-gid)
(directory "/etc")
(directory "/var/log") ; for dmd
(directory "/var/run/nscd")
@ -589,24 +594,20 @@ You can log in as 'guest' or 'root' with no password.
(directory "/var/nix/profiles/per-user/guest"
1000 100)
(directory "/home/guest" 1000 100)))
(out (derivation->output-path
(package-derivation store mingetty)))
(boot (add-text-to-store store "boot"
(object->string
(boot (text-file "boot" (object->string
`(execl ,dmd-file "dmd"
"--config" ,dmd-conf))))
(entries (list (menu-entry
(entries -> (list (return (menu-entry
(label (string-append
"GNU System with Linux-Libre "
"GNU system with Linux-Libre "
(package-version linux-libre)
" (technology preview)"))
(linux linux-libre)
(linux-arguments `("--root=/dev/vda1"
,(string-append "--load=" boot)))
(initrd gnu-system-initrd))))
(grub.cfg (grub-configuration-file store entries)))
(qemu-image store
#:grub-configuration grub.cfg
(initrd gnu-system-initrd)))))
(grub.cfg (grub-configuration-file entries)))
(qemu-image #:grub-configuration grub.cfg
#:populate populate
#:disk-image-size (* 550 (expt 2 20))
#:initialize-store? #t
@ -628,6 +629,6 @@ You can log in as 'guest' or 'root' with no password.
("etc-motd" ,motd)
("net-base" ,net-base)
,@(append-map service-inputs
%dmd-services))))))
services)))))
;;; vm.scm ends here