diff options
| -rw-r--r-- | doc/guix.texi | 33 | ||||
| -rw-r--r-- | gnu/services/virtualization.scm | 67 |
2 files changed, 96 insertions, 4 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index e6f04e1413..ff2e582347 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -25445,6 +25445,8 @@ emulation of program binaries built for different architectures---e.g., it allows you to transparently execute an ARMv7 program on an x86_64 machine. It achieves this by combining the @uref{https://www.qemu.org, QEMU} emulator and the @code{binfmt_misc} feature of the kernel Linux. +This feature only allows you to emulate GNU/Linux on a different +architecture, but see below for GNU/Hurd support. @defvr {Scheme Variable} qemu-binfmt-service-type This is the type of the QEMU/binfmt service for transparent emulation. @@ -25647,10 +25649,11 @@ If the @file{/etc/childhurd} directory does not exist, the @code{secret-service} running in the Childhurd will be sent an empty list of secrets. -Typical use to populate @file{"/etc/childhurd"} with a tree of -non-volatile secrets, like so +By default, the service automatically populates @file{/etc/childhurd} +with the following non-volatile secrets, unless they already exist: @example +/etc/childhurd/etc/guix/acl /etc/childhurd/etc/guix/signing-key.pub /etc/childhurd/etc/guix/signing-key.sec /etc/childhurd/etc/ssh/ssh_host_ed25519_key @@ -25659,8 +25662,32 @@ non-volatile secrets, like so /etc/childhurd/etc/ssh/ssh_host_ecdsa_key.pub @end example -to be sent to the Childhurd, including permissions. +These files are automatically sent to the guest Hurd VM when it boots, +including permissions. +@cindex childhurd, offloading +@cindex Hurd, offloading +Having these files in place means that only a couple of things are +missing to allow the host to offload @code{i586-gnu} builds to the +childhurd: + +@enumerate +@item +Authorizing the childhurd's key on the host so that the host accepts +build results coming from the childhurd, which can be done like so: + +@example +guix archive --authorize < \ + /etc/childhurd/etc/guix/signing-key.pub +@end example + +@item +Adding the childhurd to @file{/etc/guix/machines.scm} (@pxref{Daemon +Offload Setup}). +@end enumerate + +We're working towards making that happen automatically---get in touch +with us at @email{guix-devel@@gnu.org} to discuss it! @end table @end deftp diff --git a/gnu/services/virtualization.scm b/gnu/services/virtualization.scm index b84203ad18..c639fa3741 100644 --- a/gnu/services/virtualization.scm +++ b/gnu/services/virtualization.scm @@ -23,6 +23,7 @@ #:use-module (gnu bootloader grub) #:use-module (gnu image) #:use-module (gnu packages admin) + #:use-module (gnu packages package-management) #:use-module (gnu packages ssh) #:use-module (gnu packages virtualization) #:use-module (gnu services base) @@ -992,13 +993,77 @@ is added to the OS specified in CONFIG." (shell (file-append shadow "/sbin/nologin")) (system? #t)))) +(define (initialize-hurd-vm-substitutes) + "Initialize the Hurd VM's key pair and ACL and store it on the host." + (define run + (with-imported-modules '((guix build utils)) + #~(begin + (use-modules (guix build utils) + (ice-9 match)) + + (define host-key + "/etc/guix/signing-key.pub") + + (define host-acl + "/etc/guix/acl") + + (match (command-line) + ((_ guest-config-directory) + (setenv "GUIX_CONFIGURATION_DIRECTORY" + guest-config-directory) + (invoke #+(file-append guix "/bin/guix") "archive" + "--generate-key") + + (when (file-exists? host-acl) + ;; Copy the host ACL. + (copy-file host-acl + (string-append guest-config-directory + "/acl"))) + + (when (file-exists? host-key) + ;; Add the host key to the childhurd's ACL. + (let ((key (open-fdes host-key O_RDONLY))) + (close-fdes 0) + (dup2 key 0) + (execl #+(file-append guix "/bin/guix") + "guix" "archive" "--authorize")))))))) + + (program-file "initialize-hurd-vm-substitutes" run)) + +(define (hurd-vm-activation config) + "Return a gexp to activate the Hurd VM according to CONFIG." + (with-imported-modules '((guix build utils)) + #~(begin + (use-modules (guix build utils)) + + (define secret-directory + #$(hurd-vm-configuration-secret-root config)) + + (define ssh-directory + (string-append secret-directory "/etc/ssh")) + + (define guix-directory + (string-append secret-directory "/etc/guix")) + + (unless (file-exists? ssh-directory) + ;; Generate SSH host keys under SSH-DIRECTORY. + (mkdir-p ssh-directory) + (invoke #$(file-append openssh "/bin/ssh-keygen") + "-A" "-f" secret-directory)) + + (unless (file-exists? guix-directory) + (invoke #$(initialize-hurd-vm-substitutes) + guix-directory))))) + (define hurd-vm-service-type (service-type (name 'hurd-vm) (extensions (list (service-extension shepherd-root-service-type hurd-vm-shepherd-service) (service-extension account-service-type - (const %hurd-vm-accounts)))) + (const %hurd-vm-accounts)) + (service-extension activation-service-type + hurd-vm-activation))) (default-value (hurd-vm-configuration)) (description "Provide a virtual machine (VM) running GNU/Hurd, also known as a |