The getty.auto credential is a textual configuration value, but credentials
are read as raw file contents. A value written by common text-file workflows
can therefore end in a newline, causing false\n to be rejected and ignored.
Reproducer:
printf 'false\n' > "$CREDENTIALS_DIRECTORY/getty.auto"
Before: getty units could still be generated because the credential was
ignored as invalid.
Expected: false\n is parsed the same as false and disables getty
generation.
Strip the value in getty-generator before parsing it. This keeps the
credential framework byte-preserving while applying text semantics where
getty.auto is consumed.
Follow-up for: 3a883e89bc
dongshengyuan
77b9a626ce