GNU bug report logs - #70165
D-Bus system service breaks reconfiguration when /var/run/dbus is present + /run and /var/run are on separate file systems.

Previous Next

Full log

View this message in rfc822 format

From: Hilton Chain <hako <at> ultrarare.space>
To: 70165 <at> debbugs.gnu.org
Cc: Vivien Kraus <vivien <at> planete-kraus.eu>, Liliana Marie Prikler <liliana.prikler <at> gmail.com>
Subject: bug#70165: D-Bus system service breaks reconfiguration when /var/run/dbus is present + /run and /var/run are on separate file systems.
Date: Thu, 04 Apr 2024 00:36:06 +0800

Hi,

I have /var/run and /run on separate file systems, recently I noticed system
reconfiguration stopped with "guix system: error: rename-file: Invalid
cross-device link":

--8<---------------cut here---------------start------------->8---
newfstatat(AT_FDCWD, "/run", {st_mode=S_IFDIR|0755, st_size=440, ...}, AT_SYMLINK_NOFOLLOW) = 0
newfstatat(AT_FDCWD, "/run/dbus", {st_mode=S_IFDIR|0700, st_size=40, ...}, AT_SYMLINK_NOFOLLOW) = 0
mkdir("/run", 0777)                     = -1 EEXIST (File exists)
mkdir("/run/dbus", 0777)                = -1 EEXIST (File exists)
chown("/run/dbus", 988, 983)            = 0
chmod("/run/dbus", 0755)                = 0
symlink("/run/dbus", "/var/run/dbus")   = -1 EEXIST (File exists)
readlink("/var/run/dbus", 0x1634730, 100) = -1 EINVAL (Invalid argument)
openat(AT_FDCWD, "/var/run/dbus", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 17
newfstatat(17, "", {st_mode=S_IFDIR|0755, st_size=80, ...}, AT_EMPTY_PATH) = 0
getdents64(17, 0x16dfe10 /* 4 entries */, 32768) = 112
rename("/var/run/dbus/system_bus_socket", "/run/dbus/system_bus_socket") = -1 EXDEV (Invalid cross-device link)
close(13)                               = 0
write(2, "\33[1m\33[0mguix system: error: rena"..., 67guix system: error: rename-file: Invalid cross-device link
) = 67
exit_group(1)                           = ?
+++ exited with 1 +++
--8<---------------cut here---------------end--------------->8---

It's because /var/run/dbus was used for dbus service before, and now migration
to /run/dbus is done with ‘rename-file’:

--8<---------------cut here---------------start------------->8---
(rename-file (string-append "/var/run/dbus/" next)
             (string-append "/run/dbus/" next))
--8<---------------cut here---------------end--------------->8---

I think the logic can be improved for this case, but not sure how at the moment.
What do you think?

Thanks

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.