$ git clone -n https://src.fedoraproject.org/rpms/perfetto.git /var/lib/mock/f41-build-side-1-3110688-39406/root/chroot_tmpdir/scmroot/perfetto
Cloning into '/var/lib/mock/f41-build-side-1-3110688-39406/root/chroot_tmpdir/scmroot/perfetto'...
$ git fetch origin 61cfef3760fc90ab35db39662ae9360a9e7f05a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perfetto
 * [new ref]         61cfef3760fc90ab35db39662ae9360a9e7f05a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 61cfef3 Update to 48.0