$ git clone -n https://github.com/xcp-ng-rpms/krb5.git /var/lib/mock/v8.3-u-pcoval2-10384-28945/root/chroot_tmpdir/scmroot/krb5
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10384-28945/root/chroot_tmpdir/scmroot/krb5'...
$ git fetch origin 0515208bfba1c75b0b050bdee0bfed183a1bc019:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/krb5
 * [new ref]         0515208bfba1c75b0b050bdee0bfed183a1bc019 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0515208 bump release for test build