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02/04: processes: Gracefully handle daemons without clients.
From: |
guix-commits |
Subject: |
02/04: processes: Gracefully handle daemons without clients. |
Date: |
Mon, 29 Apr 2019 16:25:35 -0400 (EDT) |
civodul pushed a commit to branch version-1.0.0
in repository guix.
commit c20d4cac1fb72afe26a3e534b92e9a9691936458
Author: Ludovic Courtès <address@hidden>
Date: Mon Apr 29 21:42:04 2019 +0200
processes: Gracefully handle daemons without clients.
Fixes <https://bugs.gnu.org/34716>.
Reported by Mark H Weaver <address@hidden>.
The problem could be reproduced by running, on one hand:
sh -c 'exec -a guix-daemon sleep 777'
and on the other hand:
guix processes
If there is no process with PID 777, 'guix processes' would barf as it
stumbles upon a <daemon-session> record whose client is #f.
* guix/scripts/processes.scm (daemon-sessions)[child-process->session]:
New procedure, with lambda formerly passed to 'map'. Handle #f returns
from 'lookup-process'.
Call 'child-process->session' within 'filter-map', not just 'map'.
---
guix/scripts/processes.scm | 25 ++++++++++++++++---------
1 file changed, 16 insertions(+), 9 deletions(-)
diff --git a/guix/scripts/processes.scm b/guix/scripts/processes.scm
index 2dd3bbf..a2ab017 100644
--- a/guix/scripts/processes.scm
+++ b/guix/scripts/processes.scm
@@ -158,15 +158,22 @@ active sessions, and the master 'guix-daemon' process."
(= pid (process-parent-id process))))
processes))
- (values (map (lambda (process)
- (match (process-command process)
- ((argv0 (= string->number client) _ ...)
- (let ((files (process-open-files process)))
- (daemon-session process
- (lookup-process client)
- (lookup-children (process-id process))
- (filter lock-file? files))))))
- children)
+ (define (child-process->session process)
+ (match (process-command process)
+ ((argv0 (= string->number client) _ ...)
+ (let ((files (process-open-files process))
+ (client (lookup-process client)))
+ ;; After a client has died, there's a window during which its
+ ;; corresponding 'guix-daemon' process is still alive, in which
+ ;; case 'lookup-process' returns #f. In that case ignore the
+ ;; session.
+ (and client
+ (daemon-session process client
+ (lookup-children
+ (process-id process))
+ (filter lock-file? files)))))))
+
+ (values (filter-map child-process->session children)
master)))
(define (daemon-session->recutils session port)