$ git clone -n https://src.fedoraproject.org/rpms/rust-predicates.git /var/lib/mock/f39-build-1526572-36078/root/chroot_tmpdir/scmroot/rust-predicates
Cloning into '/var/lib/mock/f39-build-1526572-36078/root/chroot_tmpdir/scmroot/rust-predicates'...
$ git fetch origin a41fbcbef0034f96e73149d688e1b1c7065386d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-predicates
 * [new ref]         a41fbcbef0034f96e73149d688e1b1c7065386d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a41fbcb Update to version 3.0.4; Fixes RHBZ#2239468