$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-Jabber.git /var/lib/mock/f45-build-25322-610/root/chroot_tmpdir/scmroot/perl-Net-Jabber
Cloning into '/var/lib/mock/f45-build-25322-610/root/chroot_tmpdir/scmroot/perl-Net-Jabber'...
$ git fetch origin 97f31a4db1f57e13e3730913ae009321240c3bfd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-Jabber
 * [new ref]         97f31a4db1f57e13e3730913ae009321240c3bfd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 97f31a4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild