$ git clone -n https://src.fedoraproject.org/rpms/perl-FileHandle-Fmode.git /var/lib/mock/f45-build-23623-598/root/chroot_tmpdir/scmroot/perl-FileHandle-Fmode
Cloning into '/var/lib/mock/f45-build-23623-598/root/chroot_tmpdir/scmroot/perl-FileHandle-Fmode'...
$ git fetch origin 84b5891916512bfa89395d225cf77c4e96e95f66:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-FileHandle-Fmode
 * [new ref]         84b5891916512bfa89395d225cf77c4e96e95f66 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 84b5891 Perl 5.44 rebuild