$ git clone -n https://src.fedoraproject.org/rpms/golang-github-jackc-puddle2.git /var/lib/mock/f45-build-12098-437/root/chroot_tmpdir/scmroot/golang-github-jackc-puddle2
Cloning into '/var/lib/mock/f45-build-12098-437/root/chroot_tmpdir/scmroot/golang-github-jackc-puddle2'...
$ git fetch origin a757e8d94fa06762eff740062f4183e4421ff43c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-jackc-puddle2
 * [new ref]         a757e8d94fa06762eff740062f4183e4421ff43c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a757e8d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild