$ git clone -n https://src.fedoraproject.org/rpms/perl-Sys-Detect-Virtualization.git /var/lib/mock/f45-build-26343-617/root/chroot_tmpdir/scmroot/perl-Sys-Detect-Virtualization
Cloning into '/var/lib/mock/f45-build-26343-617/root/chroot_tmpdir/scmroot/perl-Sys-Detect-Virtualization'...
$ git fetch origin 2807391528b0b6eed66124429b5f1534c2455aa9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sys-Detect-Virtualization
 * [new ref]         2807391528b0b6eed66124429b5f1534c2455aa9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2807391 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild