permissions on files inside output zip are missing (no r/w/x!)

[ctb]

Debugging sourmash-bio/sourmash#3191, I noticed that when I unzip the test-gbsketch.zip file, the permissions on the files inside are entirely missing

ls -lR
total 8
----------  1 t  staff  1176 Jun  7  2024 SOURMASH-MANIFEST.csv
drwxr-xr-x  7 t  staff   224 Jun  7 06:24 signatures

./signatures:
total 256
----------  1 t  staff  22245 Jun  7  2024 8196cc69b814cab9fc3c7e9eed861bf6.sig.gz
----------  1 t  staff  45420 Jun  7  2024 a9a2f47091e05bf235130a97b85a0d85.sig.gz
----------  1 t  staff  15856 Jun  7  2024 d673373096c7db39957c8b4ce58aea31.sig.gz
----------  1 t  staff  15999 Jun  7  2024 de397c034304bf5f8b05c884839206d0.sig.gz
----------  1 t  staff  23316 Jun  7  2024 f54c012657c20304f8455dca3b268196.sig.gz

This doesn't actually seem to inhibit sourmash itself in any way, but it does look weird when you unpack the files 😆 .

[bluegenes]

Looks like I can set permissions via unix_permissions in ZipEntryBuilder https://docs.rs/async_zip/latest/async_zip/struct.ZipEntryBuilder.html

@ctb what permissions would you recommend?

[ctb]

The default umask on unix is usually something like

u+rw
a+r

(or whatever that translates to in octal 😉 - 644, looks like)

that seems legit, yah? could also go for 444, which I think is just a+r.