$ git clone -n https://src.fedoraproject.org/rpms/tinyproxy.git /var/lib/mock/f39-build-1579675-38038/root/chroot_tmpdir/scmroot/tinyproxy
Cloning into '/var/lib/mock/f39-build-1579675-38038/root/chroot_tmpdir/scmroot/tinyproxy'...
$ git fetch origin b1428b47ae48a3fa60dbcd21e75dc21e9d90c8a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tinyproxy
 * [new ref]         b1428b47ae48a3fa60dbcd21e75dc21e9d90c8a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1428b4 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild