$ git clone -n https://src.fedoraproject.org/rpms/perl-Gtk3-WebKit.git /var/lib/mock/f45-build-23847-599/root/chroot_tmpdir/scmroot/perl-Gtk3-WebKit
Cloning into '/var/lib/mock/f45-build-23847-599/root/chroot_tmpdir/scmroot/perl-Gtk3-WebKit'...
$ git fetch origin 6489b615d4e995713ef8aa7ac2b6903420201c42:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Gtk3-WebKit
 * [new ref]         6489b615d4e995713ef8aa7ac2b6903420201c42 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6489b61 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild