$ git clone -n https://src.fedoraproject.org/rpms/perl-Sys-Info-Base.git /var/lib/mock/f45-build-26344-617/root/chroot_tmpdir/scmroot/perl-Sys-Info-Base
Cloning into '/var/lib/mock/f45-build-26344-617/root/chroot_tmpdir/scmroot/perl-Sys-Info-Base'...
$ git fetch origin 66ba503741247d76c287baef7335fa1106616644:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sys-Info-Base
 * [new ref]         66ba503741247d76c287baef7335fa1106616644 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66ba503 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild