Unreleased regression resulting from the default data_dir now being required

[jszwedko]

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Problem

In master as of 53f97c1, Vector now requires a data directory where-as in the last release, v0.35.0, it does not. Trying to run Vector with a config not requiring a data directory, without the default data directory location existing (/var/lib/vector) results in Vector failing to start-up due to not being able to lock the data directory.

Configuration

sources:
  source0:
    type: demo_logs
    format: json
    interval: 1.0
sinks:
  sink0:
    type: blackhole
    inputs:
    - source0

Version

vector 0.36.0-custom-53f97c1c61 (aarch64-apple-darwin debug=full)

Debug Output

2024-01-23T22:12:30.385623Z  INFO vector::app: Log level is enabled. level="info"
2024-01-23T22:12:30.388729Z  INFO vector::app: Loading configs. paths=["/tmp/tmp.yaml"]
2024-01-23T22:12:30.398489Z ERROR vector::cli: Configuration error. error=No such file or directory (os error 2)
Error: command: "cargo" "run" "--no-default-features" "--features" "sinks-blackhole,sources-demo_logs" "--" "--config" "/tmp/tmp.yaml"
  failed with exit code: 78

Example Data

No response

Additional Context

No response

References

This is likely to have been introduced by #19595

[jszwedko]

Closed by #19701