Leaving empty files, and then failing on reading them.

[ruben-arts]

Checklist

• I added a descriptive title
• I searched open reports and couldn't find a duplicate

What happened?

When installing a prefix. It might result in a failure on fetching packages, if that happens the installation is instantly killed. This could result in leaving empty files. In my case it left an empty prefix/conda-meta/bla.json. This will then give an issue as the installer first checks for existing installed packages. Resulting in no way to continue without removing the prefix. As it doesn't tell you what is going wrong.

Error:
    EOF while parsing a value at line 1 column 0

Additional Context

I walked into this while testing the S3 authentication which might fail and thus stopping the installation abruptly. This might also be an issue as it doesn't close down nicely. Resulting in a left over progress bar. e.g.:

❯ pixi i
    ⠁ validate cache       [00:00:00] [━━━━━━━━━━╾─────────] markupsafe (+20)
    ⠁ download & extract   [00:00:00] [────────────────────]      0 B @ 0 B/s    email_validator (+16)
    ⠁ installing packages  [00:00:00] [━───────────────────]     2/61 python_abi (+18)                                                                         Error: 
  × failed to fetch my-webserver-0.1.0-pyh4616a5c_0.conda
      validate cache       [00:00:00] [━━━━━━━━━━━━━━━━━━━━] markupsafe (+16)
      download & extract   [00:00:00] [━━━━━━━━━━━━━━━━━━━━] 3.42 MiB @ 227.13 MiB/s email_validator (+16)
    ⠁ installing packages  [00:00:00] [━───────────────────]     2/61 python_abi (+18)    

Then trying again results in:

❯ pixi i -vvv
...
 INFO pixi::lock_file::update: the lock-file is up-to-date
 INFO pixi::lock_file::update: Updating prefix
DEBUG pixi_utils::reqwest: Using s3_config: {"rattler-s3-testing": Custom { endpoint_url: Url { scheme: "https", cannot_be_a_base: false, username: "", password: None, host: Some(Domain("e1a7cde76f1780ec06bac859036dbaf7.eu.r2.cloudflarestorage.com")), port: None, path: "/", query: None, fragment: None }, region: "auto", force_path_style: true }}
 INFO rattler_networking::s3_middleware: Creating S3 middleware using {"rattler-s3-testing": Custom { endpoint_url: Url { scheme: "https", cannot_be_a_base: false, username: "", password: None, host: Some(Domain("e1a7cde76f1780ec06bac859036dbaf7.eu.r2.cloudflarestorage.com")), port: None, path: "/", query: None, fragment: None }, region: "auto", force_path_style: true }}
DEBUG pixi_utils::reqwest: s3_middleware: S3Middleware { s3: S3 { auth_storage: AuthenticationStorage { backends: [KeyringAuthenticationStorage { store_key: "rattler" }, FileStorage { path: "/Users/rubenarts/.rattler/credentials.json", cache: RwLock { data: FileStorageCache { content: {} }, poisoned: false, .. } }, NetRcStorage { machines: {} }], cache: Mutex { data: {}, poisoned: false, .. } }, config: {"rattler-s3-testing": Custom { endpoint_url: Url { scheme: "https", cannot_be_a_base: false, username: "", password: None, host: Some(Domain("e1a7cde76f1780ec06bac859036dbaf7.eu.r2.cloudflarestorage.com")), port: None, path: "/", query: None, fragment: None }, region: "auto", force_path_style: true }}, expiration: 300s } }
DEBUG pixi::environment::conda_prefix: updating prefix for 'default'
Error: 
  × EOF while parsing a value at line 1 column 0