$ git clone -n https://src.fedoraproject.org/rpms/perl-DBD-Firebird.git /var/lib/mock/f40-build-2704700-70972/root/chroot_tmpdir/scmroot/perl-DBD-Firebird
Cloning into '/var/lib/mock/f40-build-2704700-70972/root/chroot_tmpdir/scmroot/perl-DBD-Firebird'...
$ git fetch origin cad112f74a897f4eef7bf6d408a0e5cbce8cf17f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DBD-Firebird
 * [new ref]         cad112f74a897f4eef7bf6d408a0e5cbce8cf17f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cad112f Add -Wno-incompatible-pointer-types to CFLAGS (#2259535)