$ git clone -n http://fedora.riscv.rocks:3000/rpms/clang15.git /var/lib/mock/f42-build-864448-172316/root/chroot_tmpdir/scmroot/clang15
Cloning into '/var/lib/mock/f42-build-864448-172316/root/chroot_tmpdir/scmroot/clang15'...
$ git fetch origin 771f8ae70a9465f9304770a66aeab8f227df2dda:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/clang15
 * [new ref]         771f8ae70a9465f9304770a66aeab8f227df2dda -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 771f8ae Add support for riscv64