$ git clone -n https://src.fedoraproject.org/rpms/perl-Image-Size.git /var/lib/mock/f45-build-24321-603/root/chroot_tmpdir/scmroot/perl-Image-Size
Cloning into '/var/lib/mock/f45-build-24321-603/root/chroot_tmpdir/scmroot/perl-Image-Size'...
$ git fetch origin 3e4a6362546ef251935dd7485b6112a93c9604a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Image-Size
 * [new ref]         3e4a6362546ef251935dd7485b6112a93c9604a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e4a636 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild