$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Simple.git /var/lib/mock/f40-build-2239639-53620/root/chroot_tmpdir/scmroot/perl-Test-Simple
Cloning into '/var/lib/mock/f40-build-2239639-53620/root/chroot_tmpdir/scmroot/perl-Test-Simple'...
$ git fetch origin 66caf25a4a0e7498d8e4362b0152c8a321b2f25f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Simple
 * [new ref]         66caf25a4a0e7498d8e4362b0152c8a321b2f25f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66caf25 Update to 1.302198