$ git clone -n http://fedora.riscv.rocks:3000/rpms/gcc.git /var/lib/mock/f40-build-807206-145202/root/chroot_tmpdir/scmroot/gcc
Cloning into '/var/lib/mock/f40-build-807206-145202/root/chroot_tmpdir/scmroot/gcc'...
$ git fetch origin 38f7288455e7e8964d12831367c2dc002459a972:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/gcc
 * [new ref]         38f7288455e7e8964d12831367c2dc002459a972 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 38f7288 Disable LTO bootstrap (experiment)