$ git clone -n https://src.fedoraproject.org/rpms/ghc-SHA.git /var/lib/mock/f38-build-side-42-init-devel-888939-28525/root/chroot_tmpdir/scmroot/ghc-SHA
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-888939-28525/root/chroot_tmpdir/scmroot/ghc-SHA'...
$ git fetch origin 1f144b66694f5c44c5224fe48a6859c5c6268632:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-SHA
 * [new ref]         1f144b66694f5c44c5224fe48a6859c5c6268632 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f144b6 Convert to %autorelease and %autochangelog