$ git clone -n https://github.com/fedora-riscv/perl-Sereal-Decoder.git /var/lib/mock/f39-build-1677164-40957/root/chroot_tmpdir/scmroot/perl-Sereal-Decoder
Cloning into '/var/lib/mock/f39-build-1677164-40957/root/chroot_tmpdir/scmroot/perl-Sereal-Decoder'...
$ git fetch origin e104f4b41a40d3e3d9e81e0b87795a6a05aa1de7:KOJI_FETCH_HEAD
From https://github.com/fedora-riscv/perl-Sereal-Decoder
 * [new ref]         e104f4b41a40d3e3d9e81e0b87795a6a05aa1de7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e104f4b Rebuild for f39