$ git clone -n https://src.fedoraproject.org/rpms/perl-Unicode-String.git /var/lib/mock/f45-build-27335-622/root/chroot_tmpdir/scmroot/perl-Unicode-String
Cloning into '/var/lib/mock/f45-build-27335-622/root/chroot_tmpdir/scmroot/perl-Unicode-String'...
$ git fetch origin 8d33cd67db14f25414708696e2feb6a55578243f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Unicode-String
 * [new ref]         8d33cd67db14f25414708696e2feb6a55578243f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8d33cd6 Perl 5.44 rebuild