$ git clone -n https://src.fedoraproject.org/rpms/meson.git /var/lib/mock/f38-build-side-42-init-devel-740774-27656/root/chroot_tmpdir/scmroot/meson
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-740774-27656/root/chroot_tmpdir/scmroot/meson'...
$ git fetch origin 38f358356ef4a87034a2f7d23f1f4d90058c2dca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/meson
 * [new ref]         38f358356ef4a87034a2f7d23f1f4d90058c2dca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 38f3583 Update to 1.0.1