$ git clone -n https://src.fedoraproject.org/rpms/ghc-math-functions.git /var/lib/mock/f38-build-side-42-init-devel-807442-28232/root/chroot_tmpdir/scmroot/ghc-math-functions
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-807442-28232/root/chroot_tmpdir/scmroot/ghc-math-functions'...
$ git fetch origin 889e88e8ae1285b821a460d515e9f71c3f13bdd2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-math-functions
 * [new ref]         889e88e8ae1285b821a460d515e9f71c3f13bdd2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 889e88e Convert to %autorelease and %autochangelog