DEP8 failure: cannot add submodule using file transport

[Andreas Hasenack]

The git security update for CVE 2022-39253 changed a config setting to disallow the file transport submodule by default. This is resulting in DEP8 tests failing all over the place:

$ git submodule add ../repo3 sub3
Cloning into '/tmp/test-pyus71xi-check-manifest/repo2/sub3'...
fatal: transport 'file' not allowed
fatal: clone of '/tmp/test-pyus71xi-check-manifest/repo3' into submodule path '/tmp/test-pyus71xi-check-manifest/repo2/sub3' failed

This probably wasn't seen at the time of the security update probably because DEP8 tests are not run publicly then due to embargo.

It's also affecting the devel release, where git is migrating from 2.37 to 2.38 (2.38 has the security fix).

The DEP8 fix might have to be backported to stable releases as well, or else SRUing git in the future (for non-security updates) will be a pain.

[Andreas Hasenack (ahasenack)]

Bug about the config change, marked invalid: https://bugs.launchpad.net/ubuntu/+source/git/+bug/1993586

[Andreas Hasenack (ahasenack)]

Going back to the original bug, and using bug tasks there to track the fixed in the packages that need to have their dep8 tests changed.