core: Validate that xattr names aren't empty #3261
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In the ostree-ext codebase the test fixture was generating xattrs without the trailing NUL byte. This caused confusing errors later. Change the dirmeta validator to catch this. The way GVariant represents bytestrings, the trailing NUL is there on wire/disk so it can be there in memory too, but `g_variant_get_bytestring()` will just return an empty `""` string if actually the value has a missing NUL. Signed-off-by: Colin Walters <walters@verbum.org>
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In the ostree-ext codebase the test fixture was generating xattrs without the trailing NUL byte. This caused confusing errors later. Change the dirmeta validator to catch this.
The way GVariant represents bytestrings, the trailing NUL is there on wire/disk so it can be there in memory too, but
g_variant_get_bytestring()will just return an empty""string if actually the value has a missing NUL.