$ git clone -n https://src.fedoraproject.org/rpms/perl-Mail-Sendmail.git /var/lib/mock/f45-build-24626-605/root/chroot_tmpdir/scmroot/perl-Mail-Sendmail
Cloning into '/var/lib/mock/f45-build-24626-605/root/chroot_tmpdir/scmroot/perl-Mail-Sendmail'...
$ git fetch origin bcac205ec844ce27125df81d801af495d889e611:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mail-Sendmail
 * [new ref]         bcac205ec844ce27125df81d801af495d889e611 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bcac205 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild