$ git clone -n https://src.fedoraproject.org/rpms/ghc-ansi-wl-pprint.git /var/lib/mock/f40-build-742826-110925/root/chroot_tmpdir/scmroot/ghc-ansi-wl-pprint
Cloning into '/var/lib/mock/f40-build-742826-110925/root/chroot_tmpdir/scmroot/ghc-ansi-wl-pprint'...
$ git fetch origin 5951ef959b6b0e510d955ccb8b4eb83baef02ac3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-ansi-wl-pprint
 * [new ref]         5951ef959b6b0e510d955ccb8b4eb83baef02ac3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5951ef9 revised .cabal file