$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-SharedFork.git /var/lib/mock/f45-build-26854-619/root/chroot_tmpdir/scmroot/perl-Test-SharedFork
Cloning into '/var/lib/mock/f45-build-26854-619/root/chroot_tmpdir/scmroot/perl-Test-SharedFork'...
$ git fetch origin 439941ca3699bca37c0d3c7368bd68c7c8ce889b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-SharedFork
 * [new ref]         439941ca3699bca37c0d3c7368bd68c7c8ce889b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 439941c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild