diff options
Diffstat (limited to 'guix/build/linux-initrd.scm')
| -rw-r--r-- | guix/build/linux-initrd.scm | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/guix/build/linux-initrd.scm b/guix/build/linux-initrd.scm index 0c3b2f0d9f..b488668ee2 100644 --- a/guix/build/linux-initrd.scm +++ b/guix/build/linux-initrd.scm @@ -200,11 +200,30 @@ networking values.) Return #t if INTERFACE is up, #f otherwise." the last argument of `mknod'." (+ (* major 256) minor)) +(define (pidof program) + "Return the PID of the first presumed instance of PROGRAM." + (let ((program (basename program))) + (find (lambda (pid) + (let ((exe (format #f "/proc/~a/exe" pid))) + (and=> (false-if-exception (readlink exe)) + (compose (cut string=? program <>) basename)))) + (filter-map string->number (scandir "/proc"))))) + (define* (mount-root-file-system root type #:key volatile-root? (unionfs "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." + (define (mark-as-not-killable pid) + ;; Tell the 'user-processes' dmd service that PID must be kept alive when + ;; shutting down. + (mkdir-p "/root/etc/dmd") + (let ((port (open-file "/root/etc/dmd/do-not-kill" "a"))) + (chmod port #o600) + (write pid port) + (newline port) + (close-port port))) + (catch #t (lambda () (if volatile-root? @@ -222,7 +241,12 @@ UNIONFS." "cow,allow_other,use_ino,suid,dev" "/rw-root=RW:/real-root=RO" "/root")) - (error "unionfs failed"))) + (error "unionfs failed")) + + ;; Make sure unionfs remains alive till the end. Because + ;; 'fuse_daemonize' doesn't tell the PID of the forked daemon, we + ;; have to resort to 'pidof' here. + (mark-as-not-killable (pidof unionfs))) (begin (check-file-system root type) (mount root "/root" type)))) |