$ git clone -n https://src.fedoraproject.org/rpms/ghc-prettyprinter.git /var/lib/mock/f38-build-side-42-init-devel-895746-28550/root/chroot_tmpdir/scmroot/ghc-prettyprinter
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-895746-28550/root/chroot_tmpdir/scmroot/ghc-prettyprinter'...
$ git fetch origin 49e42c34e6dc3473d8ff0f23988811c888fb6e7c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-prettyprinter
 * [new ref]         49e42c34e6dc3473d8ff0f23988811c888fb6e7c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49e42c3 Convert to %autorelease and %autochangelog