$ git clone -n https://github.com/fedora-riscv/compiler-rt.git /var/lib/mock/f39-build-1722666-41229/root/chroot_tmpdir/scmroot/compiler-rt
Cloning into '/var/lib/mock/f39-build-1722666-41229/root/chroot_tmpdir/scmroot/compiler-rt'...
$ git fetch origin fb4a53e7e528f3ec4655d40e02db077c8593911e:KOJI_FETCH_HEAD
From https://github.com/fedora-riscv/compiler-rt
 * [new ref]         fb4a53e7e528f3ec4655d40e02db077c8593911e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb4a53e Fix build on riscv64.