$ git clone -n https://gitee.com/src-openeuler/perl.git /var/lib/mock/dist-an7_9-updates-build-302137-65941/root/chroot_tmpdir/scmroot/perl
Cloning into '/var/lib/mock/dist-an7_9-updates-build-302137-65941/root/chroot_tmpdir/scmroot/perl'...
$ git fetch origin de88a4dc3c2f799157fc36173a2cf4246d5141d1:KOJI_FETCH_HEAD
From https://gitee.com/src-openeuler/perl
 * [new ref]         de88a4dc3c2f799157fc36173a2cf4246d5141d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de88a4d !89 delete unused files and provides