diff options
| -rw-r--r-- | guix/build/linux-initrd.scm | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/guix/build/linux-initrd.scm b/guix/build/linux-initrd.scm index b2cbcae7d8..b133550bca 100644 --- a/guix/build/linux-initrd.scm +++ b/guix/build/linux-initrd.scm @@ -62,6 +62,15 @@ (mkdir (scope "sys"))) (mount "none" (scope "sys") "sysfs")) +(define (move-essential-file-systems root) + "Move currently mounted essential file systems to ROOT." + (for-each (lambda (dir) + (let ((target (string-append root dir))) + (unless (file-exists? target) + (mkdir target)) + (mount dir target "" MS_MOVE))) + '("/proc" "/sys"))) + (define (linux-command-line) "Return the Linux kernel command line as a list of strings." (string-tokenize @@ -172,6 +181,7 @@ networking values.) Return #t if INTERFACE is up, #f otherwise." ;; Linux mount flags, from libc's <sys/mount.h>. (define MS_RDONLY 1) (define MS_BIND 4096) +(define MS_MOVE 8192) (define (bind-mount source target) "Bind-mount SOURCE at TARGET." @@ -271,6 +281,15 @@ run a file system check." (string->pointer options) %null-pointer)))))) +(define (switch-root root) + "Switch to ROOT as the root file system, in a way similar to what +util-linux' switch_root(8) does." + (move-essential-file-systems root) + (chdir root) + ;; TODO: Delete files from the old root. + (mount root "/" "" MS_MOVE) + (chroot ".")) + (define* (boot-system #:key (linux-modules '()) qemu-guest-networking? @@ -351,8 +370,6 @@ to it are lost." #:volatile-root? volatile-root?) (mount "none" "/root" "tmpfs")) - (mount-essential-file-systems #:root "/root") - (unless (file-exists? "/root/dev") (mkdir "/root/dev") (make-essential-device-nodes #:root "/root")) @@ -377,8 +394,7 @@ to it are lost." (if to-load (begin (format #t "loading '~a'...\n" to-load) - (chdir "/root") - (chroot "/root") + (switch-root "/root") ;; Obviously this has to be done each time we boot. Do it from here ;; so that statfs(2) returns DEVPTS_SUPER_MAGIC like libc's getpt(3) |