$ git clone -n https://src.fedoraproject.org/rpms/ghc-haskell-src-exts.git /var/lib/mock/f38-build-side-42-init-devel-711651-27248/root/chroot_tmpdir/scmroot/ghc-haskell-src-exts
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-711651-27248/root/chroot_tmpdir/scmroot/ghc-haskell-src-exts'...
$ git fetch origin 8fe0ae3f97b0354e3dbb2d737f9ec2b5e79fbb50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-haskell-src-exts
 * [new ref]         8fe0ae3f97b0354e3dbb2d737f9ec2b5e79fbb50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8fe0ae3 Convert to %autorelease and %autochangelog