+For many things, you can quickly iterate without root by doing something like:
+ * setup:
+ * uec_tgz="cirros-0.3.1~pre2-x86_64-uec.tar.gz"
+ * tar -xvzf $uec_tgz
+ * initrd=$(echo *-initrd)
+ * cp $initrd $initrd.dist
+ * frev=$(bzr revno) # set to whatever your last image was
+ * Then changes things
+ * cp $initrd.dist $initrd
+ (cd ../cirros/src && bzr status --versioned --short -r $frev |
+ awk '$2 ~ "^src/" {sub("^src/","",$2); print $2}' | cpio -H newc -o ) |
+ gzip -c >> "$initrd"
+ * kvm -kernel *-vmlinuz -initrd "$initrd" -append "console=ttyS0" -nographic