Couldn't create temporary file /tmp/apt.conf.fsIutr for passing config to apt-key

[Heinrich Schuchardt]

I tried to run
http://iso.qa.ubuntu.com/qatracker/milestones/438/builds/257552/testcases/1318/results

I downloaded http://cdimage.ubuntu.com/ubuntu-base/focal/daily/20220829.1/focal-base-riscv64.tar.gz

mkdir base
sudo tar -C base -zxf focal-base-riscv64.tar.gz
sudo mount --bind /proc base/proc
sudo mount --bind /sys base/sys
sudo mount --bind /dev base/dev
sudo mount --bind /dev/pts base/dev/pts
sudo cp /etc/resolv.conf base/etc/
sudo chroot base

apt-get update results in:

Get:1 http://ports.ubuntu.com/ubuntu-ports focal InRelease [265 kB]
Get:2 http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease [114 kB]
Err:1 http://ports.ubuntu.com/ubuntu-ports focal InRelease
  Couldn't create temporary file /tmp/apt.conf.fsIutr for passing config to apt-key
Err:2 http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease
  Couldn't create temporary file /tmp/apt.conf.x7LQrB for passing config to apt-key
Get:3 http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease [108 kB]
Err:3 http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease
  Couldn't create temporary file /tmp/apt.conf.t2upW0 for passing config to apt-key
Get:4 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease [114 kB]
Err:4 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease
  Couldn't create temporary file /tmp/apt.conf.L2I28d for passing config to apt-key
Reading package lists... Done
W: GPG error: http://ports.ubuntu.com/ubuntu-ports focal InRelease: Couldn't create temporary file /tmp/apt.conf.fsIutr for passing config to apt-key
E: The repository 'http://ports.ubuntu.com/ubuntu-ports focal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease: Couldn't create temporary file /tmp/apt.conf.x7LQrB for passing config to apt-key
E: The repository 'http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease: Couldn't create temporary file /tmp/apt.conf.t2upW0 for passing config to apt-key
E: The repository 'http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: http://ports.ubuntu.com/ubuntu-ports focal-security InRelease: Couldn't create temporary file /tmp/apt.conf.L2I28d for passing config to apt-key
E: The repository 'http://ports.ubuntu.com/ubuntu-ports focal-security InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

As touch /tmp/apt.conf.fsIutr works without issues there must be a bug in how apt creates temporary files.

[Heinrich Schuchardt (xypron)]

Outside the chroot these are my mounts relevant for the test:

$ mount | grep /home
/dev/mapper/vgubuntu-home on /home type ext4 (rw,relatime)
proc on /home/user/temp/base/proc type proc (rw,nosuid,nodev,noexec,relatime)
sysfs on /home/user/temp/base/sys type sysfs (rw,nosuid,nodev,noexec,relatime)
udev on /home/user/temp/base/dev type devtmpfs (rw,nosuid,relatime,size=7940560k,nr_inodes=1985140,mode=755,inode64)
devpts on /home/user/temp/base/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
https://iso.qa.ubuntu.com/qatracker/reports/bugs/1988145

[Julian Andres Klode (juliank)]

Closing this as invalid. The analysis is flawed, the configuration file is created by user _apt, not root, the call is literally just mkstemp() with the path given in the error message, or rather a template, so there is no bug in apt here.

It's more likely to be wrong permissions on /tmp preventing the _apt user from creating files.

[Heinrich Schuchardt (xypron)]

Thanks for pointing at user _apt.

My /tmp is chmod 777 and mounted as
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,relatime,inode64)

When I create the chroot directory in / which is chmod 755 I can execute the test case.

So I guess it is one of the mount options that is incompatible with the test case.

We need to update the test case and describe the requirements for successful execution-