$ git clone -n https://src.fedoraproject.org/rpms/ispc.git /var/lib/mock/f39-build-2500529-61675/root/chroot_tmpdir/scmroot/ispc
Cloning into '/var/lib/mock/f39-build-2500529-61675/root/chroot_tmpdir/scmroot/ispc'...
$ git fetch origin 4639c0b1717b304d17fa8dde5302301ee9aa4779:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ispc
 * [new ref]         4639c0b1717b304d17fa8dde5302301ee9aa4779 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4639c0b Update to 1.21.0 (rhbz#2195967)