$ git clone -n https://src.fedoraproject.org/rpms/perl-Sereal-Encoder.git /var/lib/mock/f38-build-side-42-init-devel-1024445-29672/root/chroot_tmpdir/scmroot/perl-Sereal-Encoder
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1024445-29672/root/chroot_tmpdir/scmroot/perl-Sereal-Encoder'...
$ git fetch origin ad3753484d557d28ba78164ff90ec57b6b1088f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sereal-Encoder
 * [new ref]         ad3753484d557d28ba78164ff90ec57b6b1088f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad37534 Update to 5.003 (rhbz#2168016)