Cache restore failure

[develop7]

Repro:

Invoke cache-nix-action following the example from it's manual:

    - name: Restore and cache Nix store
      uses: nix-community/cache-nix-action@v4
      with:
        key: cache-${{ runner.os }}-${{ hashFiles('nix/**/*.nix') }}
        restore-keys: |
          cache-${{ runner.os }}-
        gc-linux: true
        gc-max-store-size-linux: 1000000000
        gc-macos: true
        gc-max-store-size-macos: 1000000000
        purge: true
        purge-keys: cache-${{ runner.os }}-
        purge-created: true
        purge-created-max-age: 42

https://github.com/develop7/postgrest/blob/abfeda7512395ee5cf091378fc75f6d223e6833a/.github/actions/setup-nix/action.yaml#L17-L30

Expected: cache is unpacking successfully

Instead: the action output log is polluted with the messages like ones below indicating (partial?) failure to unpack the cache

/usr/bin/tar: ../../../../../nix/store/br1p5pan2pgmgrm81kj43qawd9b9nns1-libunistring-1.1/lib/libunistring.so.5.0.0: Cannot open: File exists

Link: https://github.com/PostgREST/postgrest/actions/runs/6709349886/job/18232202233?pr=2992#step:3:76

[deemp]

Hi! See the Limitations section.

[develop7]

Ohhh, I see, it fails to untar nix and deps only. Got it, thanks.

[develop7]

Hey @deemp, could you hide the lines in question behind a lines' group at least? Seems really straightforward to implement. They should collapse automatically after the end group marker being printed, and do not expand in the log viewer, so that should decrease log pollution.

[deemp]

Hi, @develop7! Nice idea. Implemented in 17d19d3

[develop7]

Works like a charm, thanks!