$ git clone -n https://src.fedoraproject.org/rpms/ghc-optional-args.git /var/lib/mock/f38-build-side-42-init-devel-930527-28746/root/chroot_tmpdir/scmroot/ghc-optional-args
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-930527-28746/root/chroot_tmpdir/scmroot/ghc-optional-args'...
$ git fetch origin 412d2e18eb528326fb1abe91f472e516f709e298:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-optional-args
 * [new ref]         412d2e18eb528326fb1abe91f472e516f709e298 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 412d2e1 Convert to %autorelease and %autochangelog