Am Donnerstag, dem 04.04.2024 um 00:36 +0800 schrieb Hilton Chain: > 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"..., 67[1m[0mguix > 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? Is there a *good* reason to have those be separate file systems? :D What does the FHS say?
Anyhow, cross-fs symlinks and rename-file ought to work assuming that both file-systems are already mounted. Is one of them not needed for boot? Cheers