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publish: Support systemd-style socket activation.

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* guix/scripts/publish.scm (systemd-socket): New procedure.
(guix-publish): Add 'style' variable.  Adjust startup message depending
on whether STYLE is 'systemd.
* doc/guix.texi (Invoking guix publish): Mention socket activation.
This commit is contained in:
Ludovic Courtès 2022-04-06 22:37:33 +02:00
parent 17c6d00b57
commit b9233cb9a8
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2 changed files with 34 additions and 5 deletions
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5
doc/guix.texi
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@ -14042,6 +14042,11 @@ spawn an HTTP server on port 8080:
guix publish
@end example
@cindex socket activation, for @command{guix publish}
@command{guix publish} can also be started following the systemd
``socket activation'' protocol (@pxref{Service De- and Constructors,
@code{make-systemd-constructor},, shepherd, The GNU Shepherd Manual}).
Once a publishing server has been authorized, the daemon may download
substitutes from it. @xref{Getting Substitutes from Other Servers}.

28
guix/scripts/publish.scm
View file

@ -1235,6 +1235,23 @@ (define (open-server-socket address)
(bind sock address)
sock))
(define (systemd-socket)
"If this program is being spawned through systemd-style \"socket
activation\", whereby the listening socket is passed as file descriptor 3,
return the corresponding socket. Otherwise return #f."
(and (equal? (and=> (getenv "LISTEN_PID") string->number)
(getpid))
(match (getenv "LISTEN_FDS")
((= string->number 1)
(let ((sock (fdopen 3 "r+0")))
(configure-socket sock)
sock))
((= string->number (? integer? n))
(leave (G_ "~a: unexpected number of startup file descriptors")
n))
(_
#f))))
(define (gather-user-privileges user)
"Switch to the identity of USER, a user name."
(catch 'misc-error
@ -1280,7 +1297,12 @@ (define-command (guix-publish . args)
(make-socket-address (sockaddr:fam addr)
(sockaddr:addr addr)
port)))
(socket (open-server-socket address))
(socket style (match (systemd-socket)
(#f
(values (open-server-socket address)
'normal))
(socket
(values socket 'systemd))))
(nar-path (assoc-ref opts 'nar-path))
(repl-port (assoc-ref opts 'repl))
(cache (assoc-ref opts 'cache))
@ -1305,10 +1327,12 @@ (define-command (guix-publish . args)
(cache-bypass-threshold
(or (assoc-ref opts 'cache-bypass-threshold)
(cache-bypass-threshold))))
(if (eq? style 'systemd)
(info (G_ "publishing (started via socket activation)~%"))
(info (G_ "publishing ~a on ~a, port ~d~%")
%store-directory
(inet-ntop (sockaddr:fam address) (sockaddr:addr address))
(sockaddr:port address))
(sockaddr:port address)))
(for-each (lambda (compression)
(info (G_ "using '~a' compression method, level ~a~%")