$ git clone -n https://src.fedoraproject.org/rpms/perl-Mail-Alias.git /var/lib/mock/f45-build-24599-605/root/chroot_tmpdir/scmroot/perl-Mail-Alias
Cloning into '/var/lib/mock/f45-build-24599-605/root/chroot_tmpdir/scmroot/perl-Mail-Alias'...
$ git fetch origin 29ab5e767264e693246ae86b65827ca55080f223:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mail-Alias
 * [new ref]         29ab5e767264e693246ae86b65827ca55080f223 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 29ab5e7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild