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Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR?

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Hi,

Quoting Helmut Grohne (2024-01-12 21:58:00)
> > What can cause mkfs.ext4 to fail with a "Permission denied" error?
> I think this is our typical problem when dealing with user namespaces. I
> guess that the thing that fails here is mkfs.ext4 opening the target image
> file (to be formatted). That file has earlier been chowned to the root uid
> inside the namespace, so permission should be there, but you need more. You
> also need execute permission (to the first uid of your namespace) for the
> containing directory up until the root. I guess that none of those are
> world-executable and not by chanced owned by your first subuid nor owned by
> the first group in your subgid range.

I'm not yet convinced that this is it. The problem occurs for Francesco when
using either /tmp or /dev/shm as a temporary directly. By default, those two
locations should have the desired permission bits set. Lets check whether
world-execute permissions are set for all directories up until root. I have
this:

    $ stat -c "%a %n" / /dev /dev/shm /tmp
    755 /
    755 /dev
    1777 /dev/shm
    1777 /tmp

Francesco, what are the world execute permissions on all path components up to
/tmp and /devv/shm in your case?

Arguably, mmdebstrap maybe should do this check at start-up. To have a
real-world test-case for such a feature, I'm eager to see how Francesco's
system looks like.

Thanks!

cheers, josch

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Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? "Francesco Poli (wintermute)" <invernomuto@paranoici.org> - 2024-01-11 00:00 +0100
  Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Johannes Schauer Marin Rodrigues <josch@debian.org> - 2024-01-11 00:50 +0100
    Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Francesco Poli <invernomuto@paranoici.org> - 2024-01-11 09:20 +0100
      Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Johannes Schauer Marin Rodrigues <josch@debian.org> - 2024-01-11 21:10 +0100
        Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Francesco Poli <invernomuto@paranoici.org> - 2024-01-12 20:10 +0100
          Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Johannes Schauer Marin Rodrigues <josch@debian.org> - 2024-01-12 23:50 +0100
            Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Francesco Poli <invernomuto@paranoici.org> - 2024-01-14 18:40 +0100
              Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Johannes Schauer Marin Rodrigues <josch@debian.org> - 2024-01-15 17:50 +0100
          Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Helmut Grohne <helmut@subdivi.de> - 2024-01-13 08:30 +0100
            Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Johannes Schauer Marin Rodrigues <josch@debian.org> - 2024-01-13 20:30 +0100
              Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Johannes Schauer Marin Rodrigues <josch@debian.org> - 2024-01-13 22:20 +0100
                Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Francesco Poli <invernomuto@paranoici.org> - 2024-01-14 18:40 +0100
                Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Helmut Grohne <helmut@subdivi.de> - 2024-01-15 07:40 +0100
                Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Francesco Poli <invernomuto@paranoici.org> - 2024-01-16 00:30 +0100
                Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Helmut Grohne <helmut@subdivi.de> - 2024-01-16 07:40 +0100
                Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Johannes Schauer Marin Rodrigues <josch@debian.org> - 2024-01-16 11:10 +0100
                Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Johannes Schauer Marin Rodrigues <josch@debian.org> - 2024-01-23 09:10 +0100
                Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Johannes Schauer Marin Rodrigues <josch@debian.org> - 2024-01-25 13:40 +0100
                Bug#1060416: mmdebstrap-autopkgtest-build-qemu fails on mkfs.ext4; does it require a 25 GiB TMPDIR? Francesco Poli <invernomuto@paranoici.org> - 2024-01-27 19:00 +0100

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