$ git clone -n https://src.fedoraproject.org/rpms/perl-IO-Tty.git /var/lib/mock/f40-build-769034-125482/root/chroot_tmpdir/scmroot/perl-IO-Tty
Cloning into '/var/lib/mock/f40-build-769034-125482/root/chroot_tmpdir/scmroot/perl-IO-Tty'...
$ git fetch origin 7dd68b3033c91ad5c6255179ec9bc02b2cd8e629:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IO-Tty
 * [new ref]         7dd68b3033c91ad5c6255179ec9bc02b2cd8e629 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7dd68b3 Update to 1.20 (rhbz#2256127)