$ git clone -n https://src.fedoraproject.org/rpms/ghc-regex-posix.git /var/lib/mock/f38-build-side-42-init-devel-750400-27661/root/chroot_tmpdir/scmroot/ghc-regex-posix
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-750400-27661/root/chroot_tmpdir/scmroot/ghc-regex-posix'...
$ git fetch origin 4e6cfe0bd5cd83c57e2f4f0d0f6b9e151cf3c8da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-regex-posix
 * [new ref]         4e6cfe0bd5cd83c57e2f4f0d0f6b9e151cf3c8da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e6cfe0 Convert to %autorelease and %autochangelog