$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Class.git /var/lib/mock/f41-build-1108168-20093/root/chroot_tmpdir/scmroot/perl-Test-Class
Cloning into '/var/lib/mock/f41-build-1108168-20093/root/chroot_tmpdir/scmroot/perl-Test-Class'...
$ git fetch origin 606aad4ef891770dfc1729db6d233dbd52c68e64:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Class
 * [new ref]         606aad4ef891770dfc1729db6d233dbd52c68e64 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 606aad4 Eliminate use of obsolete %patchN syntax (#2283636)