Re: [ptxdist] rootfs: /dev/null creation fails with 'Operation not permitted'

["Koch, Alexander" <akoch@initse.com>]

Am Thu, 30 Sep 2021 12:44:34 +0200
schrieb Michael Olbrich <m.olbrich@pengutronix.de>:

> On Thu, Sep 30, 2021 at 07:59:45AM +0000, Koch, Alexander wrote:
> > Hi #PTXdist,
> > 
> > I'm currently facing the issue that all my PTXdist builds fail in 
> > 'rootfs.make' during the creation of the /dev/null device node:
> > 
> > 
> > --------------------------------------( ... )--
> > 
> > install directory:
> >    dir=/dev
> >    owner=0
> >    group=0
> >    permissions=0755
> > 
> > install device node:
> >    owner=0
> >    group=0
> >    permissions=0666
> >    type=c
> >    major=1
> >    minor=3
> >    name=/dev/null
> > 
> > mknod: /mnt/work/ptxdist/platform-pm3/packages/rootfs.tmp/dev/null: 
> > Operation not permitted
> > Error: install_node failed!
> > 
> > xpkg_finish: failed.
> > 
> > make: *** [/usr/lib/ptxdist-2020.01.0/rules/rootfs.make:93: 
> > /mnt/work/ptxdist/platform-pm3/state/rootfs.targetinstall] Error 1
> > 
> > ------------------------------------------------
> > 
> > 
> > As you can see I'm using ptxdist-2020.01.0 for this but I've taken
> > a look at the current release code base and can't see any
> > substantial changes to the device node creation part in
> > `install_node()`. So I doubt it's an issue of that particular
> > version.
> > 
> > I've also checked I'm not using any fancy mount options for the 
> > filesystem I'm building on (btrfs) and I do not use
> > SELinux/AppArmor or any other restriction framework.
> > 
> > Builds used to work fine for years, so I'm running out of clues
> > what could be causing this issue.
> > 
> > 
> > Does anybody have an idea what I could check?  
> 
> mknod is run with fakeroot specifically to avoid permissions errors
> like this. So either fakeroot is not working properly or there is
> some bad interaction with btrfs.
> Can you run mknod with platform-*/sysroot-host/bin/fakeroot to see if
> it works manually?
> Try to create a device file on the same filesystem but also on a
> tmpfs. Do you get the same errors?

Thanks for the hint with `fakeroot`.

It seems that one is not working at all, I get the exact same
permission error as when running without it.

And I do even get it on a fresh tmpfs:

  $ mkdir /tmp/test-fs
  $ sudo mount -t tmpfs -o dev none /tmp/test-fs
  $ ./platform-pm3/sysroot-host/bin/fakeroot -- mknod \
      /tmp/test-fs/null c 1 3
  mknod: /tmp/test-fs/null: Operation not permitted


Maybe I should backport the latest 'fakeroot' package into my PTXdist
project?

I've also noticed on our buildserver everything still works fine so
it's definitely an issue with my local machine. It's an up-to-date Arch
Linux so maybe there's something new that breaks `fakeroot`...


Cheers,

Alex
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