ubuntu zip updater-script script should be smarter regarding the tar.gz copy

[Ricardo Salveti]

From current updater-script:
ui_print("Copying the ubuntu rootfs tarball...");
package_extract_file("#UBUNTUROOTFS#", "/data/ubuntu-rootfs.tar.gz");
set_progress(0.300000);

ui_print("Extracting the ubuntu rootfs tarball...");
delete_recursive("/data/ubuntu_tmp_extract");
run_program("/sbin/mkdir", "/data/ubuntu_tmp_extract");
run_program("/sbin/tar", "--numeric-owner", "-xzf", "/data/ubuntu-rootfs.tar.gz", "-C", "/data/ubuntu_tmp_extract");
set_progress(0.600000);

Improve it to use a different path in case there's not enough space at /data when flashing via recovery (could check for /sdcard instead, for example).

[Jonas Schwabe (jonas-schwabe)]

I managed to extrace files on a 1gb data partition by not copying the tarbal to /data before the extract step. But there is not much spae left yet, so another way would be to store core data (needed to boot) on /data and other stuff on another sdcard partition or so. I would not store everything on sd, it might need to be umounted sometimes, like when you attach USB and want to mount it from there.

[Florian W. (florian-will)]

My "related" branch linked above is an attempt to improve the situation. It seems quite complicated (76 new SLOC), but was the simplest solution I could think of. Considering my expertise in shell scripts, there probably are much better ways to do the same thing, but I hope you can use this as an inspiration.