GNU logs - #70165, boring messages

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Subject: bug#70165: D-Bus system service breaks reconfiguration when /var/run/dbus is present + /run and /var/run are on separate file systems.
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Date: Thu, 04 Apr 2024 00:36:06 +0800
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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=3DS_IFDIR|0755, st_size=3D440, ...}, =
AT_SYMLINK_NOFOLLOW) =3D 0
newfstatat(AT_FDCWD, "/run/dbus", {st_mode=3DS_IFDIR|0700, st_size=3D40, ..=
.}, AT_SYMLINK_NOFOLLOW) =3D 0
mkdir("/run", 0777)                     =3D -1 EEXIST (File exists)
mkdir("/run/dbus", 0777)                =3D -1 EEXIST (File exists)
chown("/run/dbus", 988, 983)            =3D 0
chmod("/run/dbus", 0755)                =3D 0
symlink("/run/dbus", "/var/run/dbus")   =3D -1 EEXIST (File exists)
readlink("/var/run/dbus", 0x1634730, 100) =3D -1 EINVAL (Invalid argument)
openat(AT_FDCWD, "/var/run/dbus", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY=
) =3D 17
newfstatat(17, "", {st_mode=3DS_IFDIR|0755, st_size=3D80, ...}, AT_EMPTY_PA=
TH) =3D 0
getdents64(17, 0x16dfe10 /* 4 entries */, 32768) =3D 112
rename("/var/run/dbus/system_bus_socket", "/run/dbus/system_bus_socket") =
=3D -1 EXDEV (Invalid cross-device link)
close(13)                               =3D 0
write(2, "\33[1m\33[0mguix system: error: rena"..., 67=1B[1m=1B[0mguix syst=
em: error: rename-file: Invalid cross-device link
) =3D 67
exit_group(1)                           =3D ?
+++ exited with 1 +++
--8<---------------cut here---------------end--------------->8---

It's because /var/run/dbus was used for dbus service before, and now migrat=
ion
to /run/dbus is done with =A1rename-file=A2:

--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 mo=
ment.
What do you think?

Thanks

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Hilton Chain <hako@HIDDEN>
Subject: bug#70165: Acknowledgement (D-Bus system service breaks
 reconfiguration when /var/run/dbus is present + /run and /var/run are on
 separate file systems.)
Message-ID: <handler.70165.B.171216228811124.ack <at> debbugs.gnu.org>
References: <87frw2mmix.wl-hako@HIDDEN>
X-Gnu-PR-Message: ack 70165
X-Gnu-PR-Package: guix
Reply-To: 70165 <at> debbugs.gnu.org
Date: Wed, 03 Apr 2024 16:39:04 +0000

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70165: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D70165
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Message sent to bug-guix@HIDDEN:

Subject: bug#70165: D-Bus system service breaks reconfiguration when /var/run/dbus is present + /run and /var/run are on separate file systems.
Resent-From: Liliana Marie Prikler <liliana.prikler@HIDDEN>
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To: Hilton Chain <hako@HIDDEN>, 70165 <at> debbugs.gnu.org
Cc: Vivien Kraus <vivien@HIDDEN>
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From: Liliana Marie Prikler <liliana.prikler@HIDDEN>
Date: Thu, 04 Apr 2024 20:52:09 +0200
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Am Donnerstag, dem 04.04.2024 um 00:36 +0800 schrieb Hilton Chain:
> Hi,
>=20
> 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":
>=20
> --8<---------------cut here---------------start------------->8---
> newfstatat(AT_FDCWD, "/run", {st_mode=3DS_IFDIR|0755, st_size=3D440,
> ...}, AT_SYMLINK_NOFOLLOW) =3D 0
> newfstatat(AT_FDCWD, "/run/dbus", {st_mode=3DS_IFDIR|0700, st_size=3D40,
> ...}, AT_SYMLINK_NOFOLLOW) =3D 0
> mkdir("/run", 0777)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D -1 E=
EXIST (File exists)
> mkdir("/run/dbus", 0777)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D -1 EEXIST (File exists)
> chown("/run/dbus", 988, 983)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 =3D 0
> chmod("/run/dbus", 0755)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 0
> symlink("/run/dbus", "/var/run/dbus")=C2=A0=C2=A0 =3D -1 EEXIST (File exi=
sts)
> readlink("/var/run/dbus", 0x1634730, 100) =3D -1 EINVAL (Invalid
> argument)
> openat(AT_FDCWD, "/var/run/dbus",
> O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) =3D 17
> newfstatat(17, "", {st_mode=3DS_IFDIR|0755, st_size=3D80, ...},
> AT_EMPTY_PATH) =3D 0
> getdents64(17, 0x16dfe10 /* 4 entries */, 32768) =3D 112
> rename("/var/run/dbus/system_bus_socket",
> "/run/dbus/system_bus_socket") =3D -1 EXDEV (Invalid cross-device link)
> close(13)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 0
> write(2, "\33[1m\33[0mguix system: error: rena"..., 67=1B[1m=1B[0mguix
> system: error: rename-file: Invalid cross-device link
> ) =3D 67
> exit_group(1)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 =3D ?
> +++ exited with 1 +++
> --8<---------------cut here---------------end--------------->8---
>=20
> It's because /var/run/dbus was used for dbus service before, and now
> migration to /run/dbus is done with =E2=80=98rename-file=E2=80=99:
>=20
> --8<---------------cut here---------------start------------->8---
> (rename-file (string-append "/var/run/dbus/" next)
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
(string-append "/run/dbus/" next))
> --8<---------------cut here---------------end--------------->8---
>=20
> 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

Message sent to bug-guix@HIDDEN:

Subject: bug#70165: D-Bus system service breaks reconfiguration when /var/run/dbus is present + /run and /var/run are on separate file systems.
Resent-From: Hilton Chain <hako@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-guix@HIDDEN
Resent-Date: Fri, 05 Apr 2024 01:55:01 +0000
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To: Liliana Marie Prikler <liliana.prikler@HIDDEN>
Cc: Vivien Kraus <vivien@HIDDEN>, 70165 <at> debbugs.gnu.org
Date: Fri, 05 Apr 2024 09:53:25 +0800
Message-ID: <8734s0wp62.wl-hako@HIDDEN>
From: Hilton Chain <hako@HIDDEN>
In-Reply-To: <4420d6a7c4845c60cec8884066bf15b0d5b4c5fc.camel@HIDDEN>
References: <87frw2mmix.wl-hako@HIDDEN>	<4420d6a7c4845c60cec8884066bf15b0d5b4c5fc.camel@HIDDEN>
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On Fri, 05 Apr 2024 02:52:09 +0800,
Liliana Marie Prikler wrote:
>
> 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=3DS_IFDIR|0755, st_size=3D440,
> > ...}, AT_SYMLINK_NOFOLLOW) =3D 0
> > newfstatat(AT_FDCWD, "/run/dbus", {st_mode=3DS_IFDIR|0700, st_size=3D40,
> > ...}, AT_SYMLINK_NOFOLLOW) =3D 0
> > mkdir("/run", 0777)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D -=
1 EEXIST (File exists)
> > mkdir("/run/dbus", 0777)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D -1 EEXIST (File exists)
> > chown("/run/dbus", 988, 983)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 =3D 0
> > chmod("/run/dbus", 0755)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 0
> > symlink("/run/dbus", "/var/run/dbus")=C2=A0=C2=A0 =3D -1 EEXIST (File e=
xists)
> > readlink("/var/run/dbus", 0x1634730, 100) =3D -1 EINVAL (Invalid
> > argument)
> > openat(AT_FDCWD, "/var/run/dbus",
> > O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) =3D 17
> > newfstatat(17, "", {st_mode=3DS_IFDIR|0755, st_size=3D80, ...},
> > AT_EMPTY_PATH) =3D 0
> > getdents64(17, 0x16dfe10 /* 4 entries */, 32768) =3D 112
> > rename("/var/run/dbus/system_bus_socket",
> > "/run/dbus/system_bus_socket") =3D -1 EXDEV (Invalid cross-device link)
> > close(13)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D 0
> > write(2, "\33[1m\33[0mguix system: error: rena"..., 67=1B[1m=1B[0mguix
> > system: error: rename-file: Invalid cross-device link
> > ) =3D 67
> > exit_group(1)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 =3D ?
> > +++ 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 =E2=80=98rename-file=E2=80=99:
> >
> > --8<---------------cut here---------------start------------->8---
> > (rename-file (string-append "/var/run/dbus/" next)
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 (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?

Specifically, I'm using tmpfs for them:

--8<---------------cut here---------------start------------->8---
(file-system
  (type "tmpfs")
  (mount-point "/run")
  (device "tmpfs")
  (flags '(no-dev strict-atime))
  (options "mode=3D0755,nr_inodes=3D800k,size=3D20%")
  (needed-for-boot? #t)
  (check? #f))

(file-system
  (type "tmpfs")
  (mount-point "/var/run")
  (device "tmpfs")
  (flags '(no-suid no-dev strict-atime))
  (options "mode=3D0755,nr_inodes=3D800k,size=3D20%")
  (needed-for-boot? #t)
  (check? #f))
--8<---------------cut here---------------end--------------->8---


And here's a reproducer:

--8<---------------cut here---------------start------------->8---
test_dir=3D"$(mktemp --directory)"

sudo mount --type tmpfs none "$test_dir"
touch "$test_dir/test"

guile -c "(rename-file \"$test_dir/test\" \"/tmp/test\")"

sudo umount "$test_dir"
rmdir "$test_dir"
--8<---------------cut here---------------end--------------->8---

--8<---------------cut here---------------start------------->8---
Backtrace:
In ice-9/boot-9.scm:
  1752:10  6 (with-exception-handler _ _ #:unwind? _ # _)
In unknown file:
           5 (apply-smob/0 #<thunk 7061ede8c300>)
In ice-9/boot-9.scm:
    724:2  4 (call-with-prompt ("prompt") #<procedure 7061ede99320 =E2=80=
=A6> =E2=80=A6)
In ice-9/eval.scm:
    619:8  3 (_ #(#(#<directory (guile-user) 7061ede8fc80>)))
In ice-9/command-line.scm:
   185:19  2 (_ #<input: string 7061ede89850>)
In unknown file:
           1 (eval (rename-file "/tmp/tmp.9wyzRfQ28l/test" "/tmp/=E2=80=A6"=
) #)
           0 (rename-file "/tmp/tmp.9wyzRfQ28l/test" "/tmp/test")

ERROR: In procedure rename-file:
In procedure rename-file: Invalid cross-device link
--8<---------------cut here---------------end--------------->8---

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Subject: bug#70165: D-Bus system service breaks reconfiguration when /var/run/dbus is present + /run and /var/run are on separate file systems.
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From: Liliana Marie Prikler <liliana.prikler@HIDDEN>
Date: Sat, 06 Apr 2024 08:43:28 +0200
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Am Freitag, dem 05.04.2024 um 09:53 +0800 schrieb Hilton Chain:
> [H]ere's a reproducer:
>=20
> --8<---------------cut here---------------start------------->8---
> test_dir=3D"$(mktemp --directory)"
>=20
> sudo mount --type tmpfs none "$test_dir"
> touch "$test_dir/test"
>=20
> guile -c "(rename-file \"$test_dir/test\" \"/tmp/test\")"
>=20
> sudo umount "$test_dir"
> rmdir "$test_dir"
> --8<---------------cut here---------------end--------------->8---
>=20
> --8<---------------cut here---------------start------------->8---
> Backtrace:
> In ice-9/boot-9.scm:
> =C2=A0 1752:10=C2=A0 6 (with-exception-handler _ _ #:unwind? _ # _)
> In unknown file:
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 5 (apply-smo=
b/0 #<thunk 7061ede8c300>)
> In ice-9/boot-9.scm:
> =C2=A0=C2=A0=C2=A0 724:2=C2=A0 4 (call-with-prompt ("prompt") #<procedure=
 7061ede99320 =E2=80=A6>
> =E2=80=A6)
> In ice-9/eval.scm:
> =C2=A0=C2=A0=C2=A0 619:8=C2=A0 3 (_ #(#(#<directory (guile-user) 7061ede8=
fc80>)))
> In ice-9/command-line.scm:
> =C2=A0=C2=A0 185:19=C2=A0 2 (_ #<input: string 7061ede89850>)
> In unknown file:
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1 (eval (ren=
ame-file "/tmp/tmp.9wyzRfQ28l/test" "/tmp/=E2=80=A6")
> #)
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0 (rename-fi=
le "/tmp/tmp.9wyzRfQ28l/test" "/tmp/test")
>=20
> ERROR: In procedure rename-file:
> In procedure rename-file: Invalid cross-device link
> --8<---------------cut here---------------end--------------->8---
If I understand this reproducer correctly, there aren't even symbolic
links involved, are there?

Adding Ludo to CC, because this looks like a Guile bug to me.

Cheers

Last modified: Sat, 6 Apr 2024 06:45:04 UTC

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