bug#35584: CD/DVD does not work

bug#35584: CD/DVD does not work

[sirgazil]

Hi,

I installed the GNU system in a real machine using the Guix 1.0 ISO installer (https://ftp.gnu.org/gnu/guix/guix-system-install-1.0.0.x86_64-linux.iso.xz).

When I insert a CD or a DVD the drive light flashes for a moment, then turns off, but it seems the discs are never mounted. GNOME displays no messages, GNOME Files does not list the drive, I don't see anything related to DVD after running  "findmnt", and running "lsblk" says:

```
$ lsblk 
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 931,5G  0 disk 
├─sda1   8:1    0   750M  0 part /boot/efi
├─sda2   8:2    0   3,7G  0 part [SWAP]
└─sda3   8:3    0 927,1G  0 part /
sr0     11:0    1  1024M  0 rom
```


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https://sirgazil.bitbucket.io/

bug#35584: CD/DVD does not work

[pelzflorian (Florian Pelz)]

On Sun, May 05, 2019 at 11:52:36AM -0500, sirgazil wrote:
> Hi,
> 
> I installed the GNU system in a real machine using the Guix 1.0 ISO installer (https://ftp.gnu.org/gnu/guix/guix-system-install-1.0.0.x86_64-linux.iso.xz).
> 
> When I insert a CD or a DVD the drive light flashes for a moment, then turns off, but it seems the discs are never mounted. GNOME displays no messages, GNOME Files does not list the drive, I don't see anything related to DVD after running  "findmnt", and running "lsblk" says:
> 
> ```
> $ lsblk 
> NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
> sda      8:0    0 931,5G  0 disk 
> ├─sda1   8:1    0   750M  0 part /boot/efi
> ├─sda2   8:2    0   3,7G  0 part [SWAP]
> └─sda3   8:3    0 927,1G  0 part /
> sr0     11:0    1  1024M  0 rom
> ```

I can confirm.  So sr0 is visible.  The same happens for me on an
internal and an external USB DVD drive when I insert a video DVD, but
I can play it with VLC and once I open the drive /dev/sr0 in VLC it
gets auto-mounted in Nautilus.  Note that I have gvfs in my packages
field, if that makes a difference.

On Arch the DVD gets mounted by Nautilus immediately on insert.

I have no idea why that happens though.

Regards,
Florian

bug#35584: CD/DVD does not work

[Ricardo Wurmus]

pelzflorian (Florian Pelz) <pelzflorian@pelzflorian.de> writes:

> On Sun, May 05, 2019 at 11:52:36AM -0500, sirgazil wrote:
>> Hi,
>>
>> I installed the GNU system in a real machine using the Guix 1.0 ISO installer (https://ftp.gnu.org/gnu/guix/guix-system-install-1.0.0.x86_64-linux.iso.xz).
>>
>> When I insert a CD or a DVD the drive light flashes for a moment, then turns off, but it seems the discs are never mounted. GNOME displays no messages, GNOME Files does not list the drive, I don't see anything related to DVD after running  "findmnt", and running "lsblk" says:
>>
>> ```
>> $ lsblk
>> NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
>> sda      8:0    0 931,5G  0 disk
>> ├─sda1   8:1    0   750M  0 part /boot/efi
>> ├─sda2   8:2    0   3,7G  0 part [SWAP]
>> └─sda3   8:3    0 927,1G  0 part /
>> sr0     11:0    1  1024M  0 rom
>> ```
>
> I can confirm.  So sr0 is visible.  The same happens for me on an
> internal and an external USB DVD drive when I insert a video DVD, but
> I can play it with VLC and once I open the drive /dev/sr0 in VLC it
> gets auto-mounted in Nautilus.  Note that I have gvfs in my packages
> field, if that makes a difference.
>
> On Arch the DVD gets mounted by Nautilus immediately on insert.

I cannot reproduce this with a slightly older system.  On my workstation
CDs could always be mounted by Nautilus immediately.  If this doesn’t
work any more it must be a regression.

--
Ricardo

bug#35584: CD/DVD does not work

[Pierre Neidhardt]

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Not sure it's related, but it's awfully similar to the issue I'm having
with CDEmu: I can load images but nothing ever gets mounted.

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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bug#35584: CD/DVD does not work

[sirgazil via Bug reports for GNU Guix]

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Just to add that the problem is still present today on:



$ LANG=C guix describe
Generation 5    Nov 04 2019 14:24:15    (current)
  guix bf7b08c
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: bf7b08c4fe7d14c25a83bde99f19eca1119d88ff


Also, I was able to use the drive successfully from a Trisquel 8 Live USB stick. So, at least I know the drive works.





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https://sirgazil.bitbucket.io/

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bug#35584: CD/DVD does not work

[Luis Felipe via Bug reports for GNU Guix]

This bug persist on the Guix version I'm using:

★★★★★★★★★★
$ guix describe
Generation 4	Jul 05 2020 13:40:24	(current)
  guix 6ee7468
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 6ee7468758d7c043692ae8c0b5e130fa4eabe94c
★★★★★★★★★★

There is one thing I hadn't noticed before, though. If I insert a DVD while I'm in a GNOME session, it doesn't work (that's the bug), but if I reboot with the DVD still in, log in to GNOME and open Nautilus, the DVD is listed and it works correctly. After doing this, if I extract the DVD and insert it again, it still doesn't work.

bug#35584: CD/DVD does not work

[Danny Milosavljevic]

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Hi,

On Wed, 29 Jul 2020 00:15:39 +0000
Luis Felipe via Bug reports for GNU Guix <bug-guix@gnu.org> wrote:

> There is one thing I hadn't noticed before, though. If I insert a DVD while I'm in a GNOME session, it doesn't work (that's the bug), but if I reboot with the DVD still in, log in to GNOME and open Nautilus, the DVD is listed and it works correctly. After doing this, if I extract the DVD and insert it again, it still doesn't work.

Checking nautilus sources, it uses GVolumeMonitor which is part of glib (gio).
That uses GUnixMountMonitor, and that checks /proc/mounts and fstab.

fstab is found like this:

static char *
get_fstab_file (void)
{
#ifdef HAVE_LIBMOUNT
  return (char *) mnt_get_fstab_path ();
#else
#if defined(HAVE_SYS_MNTCTL_H) && defined(HAVE_SYS_VMOUNT_H) && defined(HAVE_SYS_VFS_H)
  /* AIX */
  return "/etc/filesystems";
#elif defined(_PATH_MNTTAB)
  return _PATH_MNTTAB;
#elif defined(VFSTAB)
  return VFSTAB;
#else
  return "/etc/fstab";
#endif
#endif
}

libmount is part of util-linux, which has:

/**
 * mnt_get_fstab_path:
 *
 * Returns: path to /etc/fstab or $LIBMOUNT_FSTAB.
 */
const char *mnt_get_fstab_path(void)
{
        const char *p = safe_getenv("LIBMOUNT_FSTAB");
        return p ? : _PATH_MNTTAB;
}

In order to debug this problem, please try setting the environment variable
before starting nautilus, like this:

killall nautilus
export LIBMOUNT_FSTAB=/etc/fstab
nautilus

Then check whether detecting changes in CD/DVD state work fine like this.

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bug#35584: CD/DVD does not work

[Luis Felipe via Bug reports for GNU Guix]

Hi, Danny.

>     In order to debug this problem, please try setting the environment variable
>     before starting nautilus, like this:
>
>     killall nautilus
>     export LIBMOUNT_FSTAB=/etc/fstab
>     nautilus
>
>     Then check whether detecting changes in CD/DVD state work fine like this.
>

Unfortunately not. I got this:

$ killall nautilus
nautilus: no process found

So I closed any visible instance of Nautilus instead, exported the LIBMOUNT_FSTAB variable, started nautilus, inserted a DVD, and it didn't work.

bug#35584: CD/DVD does not work

[Luis Felipe via Bug reports for GNU Guix]

This bug persists in the Guix System version I'm using:

guix 08d8c2d
linux-libre 5.9.12-gnu

bug#35584: CDs and DVDs aren't auto-mounted

[raingloom]

This persists. System commit from about 1-2 weeks ago. (built from
private branch, so commit name wouldn't mean much)

Not sure how to investigate, because last time I tried looking into
GVFS issues it turned out to be a huge mess.