$ git clone -n https://src.fedoraproject.org/rpms/perl-App-GitHooks.git /var/lib/mock/f45-build-21705-587/root/chroot_tmpdir/scmroot/perl-App-GitHooks
Cloning into '/var/lib/mock/f45-build-21705-587/root/chroot_tmpdir/scmroot/perl-App-GitHooks'...
$ git fetch origin 63c5c3f8ce68a5a0084b5640f5d3e553c08ab504:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-App-GitHooks
 * [new ref]         63c5c3f8ce68a5a0084b5640f5d3e553c08ab504 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63c5c3f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild