$ git clone -n https://src.fedoraproject.org/rpms/perl-AWS-Signature4.git /var/lib/mock/f45-build-21543-586/root/chroot_tmpdir/scmroot/perl-AWS-Signature4
Cloning into '/var/lib/mock/f45-build-21543-586/root/chroot_tmpdir/scmroot/perl-AWS-Signature4'...
$ git fetch origin 1826938cea297e0348437ae6d57a167aff71e75d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-AWS-Signature4
 * [new ref]         1826938cea297e0348437ae6d57a167aff71e75d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1826938 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild