$ git clone -n https://src.fedoraproject.org/rpms/rust-pangocairo0.21.git /var/lib/mock/f45-build-43730-805/root/chroot_tmpdir/scmroot/rust-pangocairo0.21
Cloning into '/var/lib/mock/f45-build-43730-805/root/chroot_tmpdir/scmroot/rust-pangocairo0.21'...
$ git fetch origin 8a0de5d69efe19017ed121181edb0774f42188a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pangocairo0.21
 * [new ref]         8a0de5d69efe19017ed121181edb0774f42188a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a0de5d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild