[Bug 2079993] [NEW] systemd initramfs-tools hook fails on s390x if /etc/udev/rules.d/*.rules empty

[Nick Rosbrook]

Public bug reported:

E.g. https://autopkgtest.ubuntu.com/results/autopkgtest-
oracular/oracular/s390x/i/initramfs-tools/20240909_091354_592dd@/log.gz

1489s autopkgtest [09:13:45]: @@@@@@@@@@@@@@@@@@@@ summary
1489s qemu-ata-only        SKIP Test lists explicitly supported architectures, but the current architecture s390x isn't listed.
1489s qemu-ata-only        SKIP Test lists explicitly supported architectures, but the current architecture s390x isn't listed.
1489s unit-tests           PASS
1489s qemu-klibc           FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
1489s qemu-busybox         FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
1489s qemu-virtio-only     FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
1489s qemu-separate-usr    FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
1489s qemu-panic-shell     FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
1489s qemu-net             FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
1489s qemu-net-dnsmasq     FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
1493s nova [W] Using flock in prodstack6-s390x

This is because of the glob usage `for rules in
/etc/udev/rules.d/*.rules`. When no matching files are found, we just
iterate over the string literal "/etc/udev/rules.d/*.rules".

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: update-excuse

** Tags added: update-e

** Tags removed: update-e
** Tags added: update-excuse

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https://bugs.launchpad.net/bugs/2079993

Title:
  systemd initramfs-tools hook fails on s390x if
  /etc/udev/rules.d/*.rules empty

Status in systemd package in Ubuntu:
  New

Bug description:
  E.g. https://autopkgtest.ubuntu.com/results/autopkgtest-
  oracular/oracular/s390x/i/initramfs-
  tools/20240909_091354_592dd@/log.gz

  1489s autopkgtest [09:13:45]: @@@@@@@@@@@@@@@@@@@@ summary
  1489s qemu-ata-only        SKIP Test lists explicitly supported architectures, but the current architecture s390x isn't listed.
  1489s qemu-ata-only        SKIP Test lists explicitly supported architectures, but the current architecture s390x isn't listed.
  1489s unit-tests           PASS
  1489s qemu-klibc           FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
  1489s qemu-busybox         FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
  1489s qemu-virtio-only     FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
  1489s qemu-separate-usr    FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
  1489s qemu-panic-shell     FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
  1489s qemu-net             FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
  1489s qemu-net-dnsmasq     FAIL stderr: /usr/sbin/chzdev: Could not open file /etc/udev/rules.d/*.rules: No such file or directory
  1493s nova [W] Using flock in prodstack6-s390x

  This is because of the glob usage `for rules in
  /etc/udev/rules.d/*.rules`. When no matching files are found, we just
  iterate over the string literal "/etc/udev/rules.d/*.rules".

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