$ git clone -n https://src.fedoraproject.org/rpms/perl-Digest-MD5-File.git /var/lib/mock/f45-build-23134-596/root/chroot_tmpdir/scmroot/perl-Digest-MD5-File
Cloning into '/var/lib/mock/f45-build-23134-596/root/chroot_tmpdir/scmroot/perl-Digest-MD5-File'...
$ git fetch origin af1d14a278113732e4429508a5fea583a759cc63:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Digest-MD5-File
 * [new ref]         af1d14a278113732e4429508a5fea583a759cc63 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af1d14a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild