$ git clone -n https://src.fedoraproject.org/rpms/pam-kwallet.git /var/lib/mock/f41-build-834325-158251/root/chroot_tmpdir/scmroot/pam-kwallet
Cloning into '/var/lib/mock/f41-build-834325-158251/root/chroot_tmpdir/scmroot/pam-kwallet'...
$ git fetch origin 0df42da3bcf91bf889d9e2df2b16e2a4a1a1d0b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pam-kwallet
 * [new ref]         0df42da3bcf91bf889d9e2df2b16e2a4a1a1d0b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0df42da rebuild