opening zarr ZipStore requires write access even with mode="r"

[hardingnj]

-rw-r--r-- 1 root user 18M Jun 29 10:11 testzarr.zip

z = zarr.open_group("testzarr.zip", mode="r")

Returns a permissions error.

Version and installation information

Please provide the following:

• Value of zarr.__version__ 2.2.0
• Value of numcodecs.__version__ 0.15
• Version of Python interpreter: 3.6.5
• Linux njh-OptiPlex-9020 4.10.0-38-generic Filters #42~16.04.1-Ubuntu SMP Tue Oct 10 16:32:20 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
• via conda

[hardingnj]

Workaround (thanks @alimanfoo)

store = zarr.ZipStore('testzarr.zip', mode='r')
z = zarr.Group(store)

[alimanfoo]

Thanks @hardingnj.

For reference the problem is that the mode argument is not getting passed down to the code that turns the file path into a store. I.e., at this line where _normalize_store_arg() is called. The normalize_store_arg() function should accept some argument to tell it store should be read only.

[jakirkham]

The first link appears to have gone stale. Do you have a permalink, @alimanfoo?

[alimanfoo]

I've updated the comment above with permalinks.

[jakirkham]

Is normalize_store_arg intended to be part of the public API? If not, maybe we can just change clobber to mode.