$ git clone -n https://src.fedoraproject.org/rpms/perl-Mouse.git /var/lib/mock/f41-build-834538-158280/root/chroot_tmpdir/scmroot/perl-Mouse
Cloning into '/var/lib/mock/f41-build-834538-158280/root/chroot_tmpdir/scmroot/perl-Mouse'...
$ git fetch origin 52b3ac9fab55832a81c89e124e2a7307a15295ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mouse
 * [new ref]         52b3ac9fab55832a81c89e124e2a7307a15295ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52b3ac9 Update to 2.5.11 (rhbz#2302715)