$ git clone -n https://src.fedoraproject.org/rpms/libb64.git /var/lib/mock/f41-build-826902-154942/root/chroot_tmpdir/scmroot/libb64
Cloning into '/var/lib/mock/f41-build-826902-154942/root/chroot_tmpdir/scmroot/libb64'...
$ git fetch origin 1ee7977456b5c7096ecd4b399450dfd8f655a5cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libb64
 * [new ref]         1ee7977456b5c7096ecd4b399450dfd8f655a5cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ee7977 Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild