$ git clone -n https://src.fedoraproject.org/rpms/bcc.git /var/lib/mock/f38-build-side-42-init-devel-1281298-30670/root/chroot_tmpdir/scmroot/bcc
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1281298-30670/root/chroot_tmpdir/scmroot/bcc'...
$ git fetch origin 9c80fd08adbb02b92fcc6e9e6c75220909338b6f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bcc
 * [new ref]         9c80fd08adbb02b92fcc6e9e6c75220909338b6f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9c80fd0 Rebuilt to fix FTBFS