$ git clone -n https://src.fedoraproject.org/rpms/ec2-metadata.git /var/lib/mock/f45-build-7926-371/root/chroot_tmpdir/scmroot/ec2-metadata
Cloning into '/var/lib/mock/f45-build-7926-371/root/chroot_tmpdir/scmroot/ec2-metadata'...
$ git fetch origin 99870c5b6d4d2f56c69004f05385eedde4483c70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ec2-metadata
 * [new ref]         99870c5b6d4d2f56c69004f05385eedde4483c70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 99870c5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild