$ git clone -n https://src.fedoraproject.org/rpms/bootc.git /var/lib/mock/f42-build-874889-179130/root/chroot_tmpdir/scmroot/bootc
Cloning into '/var/lib/mock/f42-build-874889-179130/root/chroot_tmpdir/scmroot/bootc'...
$ git fetch origin f069b5139240117eb9296de21c6e8ba58b0367b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bootc
 * [new ref]         f069b5139240117eb9296de21c6e8ba58b0367b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f069b51 Update to 1.1.5 upstream release