$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rake-compiler.git /var/lib/mock/f45-build-35215-694/root/chroot_tmpdir/scmroot/rubygem-rake-compiler
Cloning into '/var/lib/mock/f45-build-35215-694/root/chroot_tmpdir/scmroot/rubygem-rake-compiler'...
$ git fetch origin 162b03bebcdcaaa0cd727b1758a4901ed378c2d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rake-compiler
 * [new ref]         162b03bebcdcaaa0cd727b1758a4901ed378c2d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 162b03b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild