$ git clone -n https://src.fedoraproject.org/rpms/libkdumpfile.git /var/lib/mock/f40-build-734349-105882/root/chroot_tmpdir/scmroot/libkdumpfile
Cloning into '/var/lib/mock/f40-build-734349-105882/root/chroot_tmpdir/scmroot/libkdumpfile'...
$ git fetch origin 2b1b8ea00ab4271fcd1a9750bb48143ce1caee06:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libkdumpfile
 * [new ref]         2b1b8ea00ab4271fcd1a9750bb48143ce1caee06 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b1b8ea Update to 0.5.2