$ git clone -n https://src.fedoraproject.org/rpms/rust-reqwest0.12.git /var/lib/mock/f45-build-44430-813/root/chroot_tmpdir/scmroot/rust-reqwest0.12
Cloning into '/var/lib/mock/f45-build-44430-813/root/chroot_tmpdir/scmroot/rust-reqwest0.12'...
$ git fetch origin fc86edf8059cfda4c99bab9abf28b69466810036:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-reqwest0.12
 * [new ref]         fc86edf8059cfda4c99bab9abf28b69466810036 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc86edf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild