$ git clone -n https://src.fedoraproject.org/rpms/rust-tagptr.git /var/lib/mock/f45-build-45306-822/root/chroot_tmpdir/scmroot/rust-tagptr
Cloning into '/var/lib/mock/f45-build-45306-822/root/chroot_tmpdir/scmroot/rust-tagptr'...
$ git fetch origin 7dab6793a75fc03eae1db2588672e84491c04aab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tagptr
 * [new ref]         7dab6793a75fc03eae1db2588672e84491c04aab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7dab679 Work around a test failure on i686