$ git clone -n https://src.fedoraproject.org/rpms/ghc-regex-base.git /var/lib/mock/f38-build-side-42-init-devel-959621-28787/root/chroot_tmpdir/scmroot/ghc-regex-base
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-959621-28787/root/chroot_tmpdir/scmroot/ghc-regex-base'...
$ git fetch origin fcc02c410fc83efd315f6e60eed079d1cee9a883:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-regex-base
 * [new ref]         fcc02c410fc83efd315f6e60eed079d1cee9a883 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fcc02c4 Convert to %autorelease and %autochangelog