$ git clone -n https://src.fedoraproject.org/rpms/rubygem-http_parser.rb.git /var/lib/mock/f42-build-865187-172845/root/chroot_tmpdir/scmroot/rubygem-http_parser.rb
Cloning into '/var/lib/mock/f42-build-865187-172845/root/chroot_tmpdir/scmroot/rubygem-http_parser.rb'...
$ git fetch origin 49e34983893f2cb9f0882b251fc9ae3c6fe39a29:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-http_parser.rb
 * [new ref]         49e34983893f2cb9f0882b251fc9ae3c6fe39a29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49e3498 Rebuilt for https://fedoraproject.org/wiki/Changes/Ruby_3.4