$ git clone -n https://src.fedoraproject.org/rpms/sdrpp.git /var/lib/mock/f45-build-35814-699/root/chroot_tmpdir/scmroot/sdrpp
Cloning into '/var/lib/mock/f45-build-35814-699/root/chroot_tmpdir/scmroot/sdrpp'...
$ git fetch origin 1a49a73ca985845fd77a5a3179260721d6f870dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sdrpp
 * [new ref]         1a49a73ca985845fd77a5a3179260721d6f870dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a49a73 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild