Super-linter: Failed to get Diff

[dshevtsov]

Describe the bug

The SuperLinter checks started to fail since yesterday with a message of the following kind:

fatal: Invalid symmetric difference expression master...a5b0bbf7126dc130ee823f60f78b4cae6d4f5f4d
2021-03-23 15:32:48 [INFO]   Failed to get Diff with:[git -C /github/workspace diff --name-only master...a5b0bbf7126dc130ee823f60f78b4cae6d4f5f4d --diff-filter=d]

Examples from different repositories:

• https://github.com/magento/devdocs/pull/8828/checks?check_run_id=2176584570#step:4:62
• https://github.com/magento/merchdocs/pull/1100/checks?check_run_id=2175097376#step:4:62

Expected behavior

The check does not fail unexpectedly.

Steps to Reproduce

Examples from different repositories:

• https://github.com/magento/devdocs/pull/8828/checks?check_run_id=2176584570#step:4:62
• https://github.com/magento/merchdocs/pull/1100/checks?check_run_id=2175097376#step:4:62

Logs

fatal: Invalid symmetric difference expression master...a5b0bbf7126dc130ee823f60f78b4cae6d4f5f4d
2021-03-23 15:32:48 [INFO]   Failed to get Diff with:[git -C /github/workspace diff --name-only master...a5b0bbf7126dc130ee823f60f78b4cae6d4f5f4d --diff-filter=d]

Additional context

The repositories use the latest version 3. I tried with v3.15.3, it fails with the same fatal.

[karlism]

We are also experiencing this issue:
https://github.com/lest/prometheus-rpm/pull/366/checks?check_run_id=2177570818

[dshevtsov]

I resolved the issue by adding fetch-depth: 0 to the workflow like in the example.

[karlism]

I resolved the issue by adding fetch-depth: 0 to the workflow like in the example.

This has fixed linting issues in our repository too.