git hook post-checkout does not work as expected

[nkhdiscovery]

Hi,
The best procedure to reproduce the bug is following step 4 of basic scenarios, versioning:
https://katacoda.com/dvc/courses/basics/versioning

It is expected that git checkout automatically triggers dvc checkout so the file.txt is restored to proper version which was committed, but it does not and cat file.txt gives test 3 after every checkout. dvc install has successfully installed the hooks, I checked, but I do not know if the tutorial is wrong or the hook is not working properly.

[shcheklein]

Yep, was able to reproduce. It can be skipped to the step 4 directly to reproduce this.

[nkhdiscovery]

@shcheklein Thanks for approval.

[efiop]

For the record, it is caused by my recent change to post-checkout hook, which accounted for branches but didn't account for tags properly 🙁 I will look into it soon. Thanks for the feedback!