$ git clone -n https://github.com/fedora-riscv/dub.git /var/lib/mock/f39-build-2398863-60550/root/chroot_tmpdir/scmroot/dub
Cloning into '/var/lib/mock/f39-build-2398863-60550/root/chroot_tmpdir/scmroot/dub'...
$ git fetch origin b0dd137bc12935654d27b10e4866391afdd63072:KOJI_FETCH_HEAD
From https://github.com/fedora-riscv/dub
 * [new ref]         b0dd137bc12935654d27b10e4866391afdd63072 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0dd137 Rebuild for f39