[jayhemnani9910]

uuidgen --namespace only takes the four @dns, @url, @oid and @x500 names. util-linux also takes any UUID there, which is how name-based UUIDs under an application's own namespace are made:

$ uuidgen -m -n 6ba7b810-9dad-11d1-80b4-00c04fd430c8 -N a
util-linux 2.41.3: 4c104dd0-4821-30d5-9ce3-0e7a1f8b7c0d
uutils:            error: invalid value '6ba7b810-9dad-11d1-80b4-00c04fd430c8' for '--namespace <namespace>': Invalid namespace 6ba7b810-9dad-11d1-80b4-00c04fd430c8.

namespace_from_str now falls back to parsing a UUID. Like libuuid's uuid_parse(), only the 36-character hyphenated form is accepted, in either case; braced, urn:uuid: and 32-digit forms are still rejected, as util-linux rejects them. The help text mentions it.

New test test_uuid_namespace (fails without the change) checks a lower and an upper case UUID against util-linux's output and the four rejected forms. The uuidgen tests pass (9), cargo clippy --all-targets -D warnings is clean for the crate. The two UUIDs also match Python's uuid.uuid3/uuid.uuid5.

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[sylvestre]

could you please also check the error message here? the exit code alone could come from something else :)

[jayhemnani9910]

Done in bcd5dfc: each rejected namespace now also checks for Invalid namespace <value>. on stderr.

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