Justin Kromlinger 0fe45b98dd Drop machine-id OSC event field if /etc/machine-id doesn't exist
While we can safely assume that `/proc/sys/kernel/random/boot_id`
exists, the same can't be said for `/etc/machine-id` in environments
where systemd is installed, but not running. An example would be OCI
containers like with the official Arch Linux image, see [0].

Without this check the prompt would constantly output `/etc/machine-id:
no such file or directory` with the OSC events introduced in dadbb34
(v258).

[0] https://gitlab.archlinux.org/archlinux/archlinux-docker/-/issues/107
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Systemd

System and Service Manager

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Details

Most documentation is available on systemd's web site.

Assorted, older, general information about systemd can be found in the systemd Wiki.

Information about build requirements is provided in the README file.

Consult our NEWS file for information about what's new in the most recent systemd versions.

Please see the Code Map for information about this repository's layout and content.

Please see the Hacking guide for information on how to hack on systemd and test your modifications.

Please see our Contribution Guidelines for more information about filing GitHub Issues and posting GitHub Pull Requests.

When preparing patches for systemd, please follow our Coding Style Guidelines.

If you are looking for support, please contact our mailing list, join our IRC channel #systemd on libera.chat or Matrix channel

Stable branches with backported patches are available in the stable repo.

We have a security bug bounty program sponsored by the Sovereign Tech Fund hosted on YesWeHack

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