Crash if there's a tag on the root commit

[mtkennerly]

Crash if there's a tag on the root commit

[mtkennerly]

No progress on the mailing list report yet, but I've updated the documentation, so I'll go ahead and close this for now.

[mtkennerly]

That's an interesting find! I was able to reproduce it on Windows using both Git 2.27.0 and 2.31.1 (the latest). I can reproduce it with --allow-empty like in your screenshot on Twitter:

$ git init
Initialized empty Git repository in C:/tmp/repro/.git/

$ git commit --allow-empty -m init
[master (root-commit) bc54978] init

$ git log --simplify-by-decoration

$ git log
commit d7814029effeb7e824e480ca52e30f5a9d1e8058 (HEAD -> master)
Author: mtkennerly <[email protected]>
Date:   Fri Apr 16 19:48:06 2021 -0400

    init

However, the issue does not occur if the first commit is non-empty:

$ git init
Initialized empty Git repository in C:/tmp/repro2/.git/

$ echo hi > foo.txt
$ git add .
$ git commit -m init
[master (root-commit) 35b6427] init
 1 file changed, 1 insertion(+)
 create mode 100644 foo.txt

$ git log --simplify-by-decoration
commit 35b6427461fe48c0e918dfea2bc5ddab9dc8844d (HEAD -> master)
Author: mtkennerly <[email protected]>
Date:   Fri Apr 16 19:51:06 2021 -0400

    init

$ git log
commit 35b6427461fe48c0e918dfea2bc5ddab9dc8844d (HEAD -> master)
Author: mtkennerly <[email protected]>
Date:   Fri Apr 16 19:51:06 2021 -0400

    init

I've reported this on the Git mailing list here: https://lore.kernel.org/git/CAKqNo6TFudrXnuPzQcOaVQrRpq_0K_fxyyMA5god-WQL7y=[e-mail]/ . If you ever want to report something to them in the future, you just have to send a plain-text email to the address listed on this page: https://git.wiki.kernel.org/index.php/GitCommunity

If they confirm that it's a bug, and given the limited scope of where it can occur, I would probably just add a note to the README in the meantime.

[ewjoachim]

Thanks :)
Indeed, I had not realized that empty commit was also a requirement to hit this bug.

Thanks for posting to the git ML!