$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Block.git /var/lib/mock/f41-build-1108186-20093/root/chroot_tmpdir/scmroot/perl-Test-Block
Cloning into '/var/lib/mock/f41-build-1108186-20093/root/chroot_tmpdir/scmroot/perl-Test-Block'...
$ git fetch origin 93ef7dfad33248854b4bbf9e23b3f5d6761e2e10:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Block
 * [new ref]         93ef7dfad33248854b4bbf9e23b3f5d6761e2e10 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 93ef7df Eliminate use of obsolete %patchN syntax (#2283636)