Git submodule lists reference to a different tag than specified when checking out tag for submodule

From: Sergii Shmarkatiuk <sergii.shmarkatiuk@gmail.com>
Date: Sep 20, 2021, 18:10 UTC
Message-ID: <CADzhcq7uoSji_PwTDU1zkgB-xWDSn5mQ+55+3JX_wkOr2s7H9w@mail.gmail.com>

Hi! I want to report an unexpected behavior of the latest version of git that I faced today.

> What did you do before the bug happened? (Steps to reproduce your issue)

I have initialized two tags Dev/0.x.0 and User/0.x.0 in a repository that is referenced as a submodule in another repository. Both tags refer to the latest commit. First I created Dev/0.x.0, then User/0.x.0:

cd ~/projects/repo1 git tag Dev/0.x.0 git tag User/0.x.0 git push --tags

cd ~/projects/repo2 git submodule add https://path-to-repo1/repo1.git cd repo1 git checkout User/0.x.0 cd .. git add repo1 git commit -m "moved repo1 to the tag User/0.x.0" git push

> What did you expect to happen? (Expected behavior)

After performing all the steps above I expected the output of the 'git
submodule' command to look as follows:
git submodule
 c575d777d33a0f1095875c7b55753eb59a51daba repo1 (User/0.x.0)

> What happened instead? (Actual behavior)

Instead, output looks as follows:

git submodule
 c575d777d33a0f1095875c7b55753eb59a51daba repo1 (Dev/0.x.0)

> What's different between what you expected and what actually happened?

Submodule references different tag than specified in the checkout command (Dev/0.x.0 instead of User/0.x.0)

[System Info] git version: git version 2.33.0 cpu: x86_64 no commit associated with this build sizeof-long: 8 sizeof-size_t: 8 shell-path: /bin/sh uname: Linux 5.11.0-34-generic #36~20.04.1-Ubuntu SMP Fri Aug 27 08:06:32 UTC 2021 x86_64 compiler info: gnuc: 9.3 libc info: glibc: 2.31 $SHELL (typically, interactive shell): /bin/bash