$ git clone -n https://src.fedoraproject.org/rpms/rust-regex-syntax.git /var/lib/mock/f38-build-side-42-init-devel-1164160-30592/root/chroot_tmpdir/scmroot/rust-regex-syntax
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1164160-30592/root/chroot_tmpdir/scmroot/rust-regex-syntax'...
$ git fetch origin 87ee30a057d75aeb71ec779832e998a81012fb82:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-regex-syntax
 * [new ref]         87ee30a057d75aeb71ec779832e998a81012fb82 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 87ee30a Update to version 0.7.4; Fixes RHBZ#2219814