Is it possible to allow write access to a mounted directory?

[k0pernicus]

Hi,

In my spin app I allowed access to a full local directory, like this, mentioned in the file server example:

[component.my_file_storage]
...
files = [{ source="storage_directory", destination="/" }]

Reading files from this directory is fine: it finds the files, I can open them and stream the content.
However I wanted to create some files or directories from the spin app to my local directory, which is not possible at this stage (leads to an "Operation not permitted" os error).

It seems that files is read-only, as stated in this issue: #605.
But is it possible to change the permissions to read & write?

It seems allow_transient_writes is not allowed anymore, and I did not find anything relevant in the documentation unfortunately.

Thanks in advance

[kate-goldenring]

Hi @k0pernicus. I looks like the flag was removed in this PR under the premise that Spin already allows writing new files: #763 (comment). However, I was able to produce your issue. I would have expected using --direct-mounts to resolve the issue; however it doesn't.

[lann]

The flag is still available: --allow-transient-write. Note that this functionality is not available in other runtimes so depending it will make your app less portable.

[kate-goldenring]

@k0pernicus, note you will need to specify both flags: spin up --allow-transient-write --direct-mounts

[k0pernicus]

Hi @lann and @kate-goldenring, this is exactly what I was looking for :)

Thanks a lot for your help!

[kate-goldenring]

@k0pernicus this fix will enable you to stop using direct mounts. Thank you for helping us identify this bug #3020