$ git clone -n https://src.fedoraproject.org/rpms/rust-triomphe.git /var/lib/mock/f45-build-45756-825/root/chroot_tmpdir/scmroot/rust-triomphe
Cloning into '/var/lib/mock/f45-build-45756-825/root/chroot_tmpdir/scmroot/rust-triomphe'...
$ git fetch origin 586effd7c13fbee9eb834deb9c411b76e29060ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-triomphe
 * [new ref]         586effd7c13fbee9eb834deb9c411b76e29060ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 586effd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild