$ git clone -n https://src.fedoraproject.org/rpms/rust-test-assembler.git /var/lib/mock/f45-build-45390-822/root/chroot_tmpdir/scmroot/rust-test-assembler
Cloning into '/var/lib/mock/f45-build-45390-822/root/chroot_tmpdir/scmroot/rust-test-assembler'...
$ git fetch origin 7954a33f4c893e69031ddee4254fdf2c12c14751:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-test-assembler
 * [new ref]         7954a33f4c893e69031ddee4254fdf2c12c14751 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7954a33 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild