101dd41cb4
Check whether the argument of the `--background` option of `systemd-run`, `run0`, `systemd-nspawn`, `systemd-vmspawn`, and `systemd-pty-forward` is either empty or looks like an ANSI color code, and reject invalid values when parsing arguments. We consider a string to look like an ANSI color code if it consists of one or more sequences of ASCII digits separated by semicolons. This permits every valid ANSI color code, and should reject anything that results in garbled output.
System and Service Manager
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