$ git clone -n https://src.fedoraproject.org/rpms/gdb.git /var/lib/mock/f40-build-777856-129593/root/chroot_tmpdir/scmroot/gdb
Cloning into '/var/lib/mock/f40-build-777856-129593/root/chroot_tmpdir/scmroot/gdb'...
$ git fetch origin 84b617d8edae0cb768dc0027691cc9bf7bef3d3f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gdb
 * [new ref]         84b617d8edae0cb768dc0027691cc9bf7bef3d3f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 84b617d Bump and rebuild for riscv64