$ git clone -n https://src.fedoraproject.org/rpms/rust-tracker-macros.git /var/lib/mock/f45-build-45617-824/root/chroot_tmpdir/scmroot/rust-tracker-macros
Cloning into '/var/lib/mock/f45-build-45617-824/root/chroot_tmpdir/scmroot/rust-tracker-macros'...
$ git fetch origin c7b4c7e1bac440b041c1c3c9ee5b5802f38ed097:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tracker-macros
 * [new ref]         c7b4c7e1bac440b041c1c3c9ee5b5802f38ed097 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c7b4c7e Update to 0.2.3 (fedora#2493939).