$ git clone -n https://src.fedoraproject.org/rpms/perl-Authen-WebAuthn.git /var/lib/mock/f45-build-21779-588/root/chroot_tmpdir/scmroot/perl-Authen-WebAuthn
Cloning into '/var/lib/mock/f45-build-21779-588/root/chroot_tmpdir/scmroot/perl-Authen-WebAuthn'...
$ git fetch origin 5c805b1462de28bfcbf1a1c8f07781a19b3261d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Authen-WebAuthn
 * [new ref]         5c805b1462de28bfcbf1a1c8f07781a19b3261d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c805b1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild