Differences

This shows you the differences between two versions of the page.

--- arch:arch_on_the_pi [2016/02/13 01:20] – Julien Deswaef
+++ arch:arch_on_the_pi [2020/08/06 21:11] (current) – Julien Deswaef
@@ Line 1: / Line 1: @@
 ====== Arch on a Pi ======
-Things related to [[http://archlinuxarm.org|Arch Linux ARM]].
+Some random notes related to [[http://archlinuxarm.org|Arch Linux ARM]] on a Raspberry Pi. Some of these notes might be turned into their own page one day.
-===== Compiling Blender =====
+===== Blender =====
+==== Installing from packages on RPi3 ====
+[[https://archlinuxarm.org/packages/aarch64/blender|Blender is compiled for ARMv8 architecture only for AArch64]].
+See bottom of this page for the right archive to use at installation: https://archlinuxarm.org/platforms/armv8/broadcom/raspberry-pi-3#installation
+Rendering a default file seems to require ''xvfb'':
+<code>
+xvfb-run blender -b -noaudio untitled_e.blend -o // -f 1
+</code>
+==== Compiling on RPi2 ====
 If it's still not in the repositories, here's a way to compile latest stable Blender for RPi2
 [[https://projects.archlinux.org/svntogit/community.git/tree/trunk?h=packages/blender|Download these two files]]. And change these two lines from PKGBUILD:
@@ Line 62: / Line 74: @@
 ===== Installing ikiwiki =====
-  * Install Git
+Install git and dev tools.
-  * Install Make
+<code>
-  * <del><code=bash>$: cpan</code></del>
+$: sudo pacman -Syu git base-devel
-  * Use Pacman with this[[https://aur.archlinux.org/packages/ikiwiki/| Aur package]]
+</code>
+Install [[https://aur.archlinux.org/packages/ikiwiki/| ikiwiki from Aur package]].
+You'll need 2 extra dependencies from Aur:
+  * [[https://aur.archlinux.org/packages/perl-cgi-formbuilder/ | perl-cgi-formbuilder]]
+  * [[https://aur.archlinux.org/packages/perl-rpc-xml/ | perl-rpc-xml]].
+Install those first. Compiling ikiwiki takes a while on a Raspberry Pi. Be patient.
+If you want to have images handle by the wiki, you will need also Imagemagick
+Although ikiwiki could be running from any server, I found it easier to run it behind Apache. So be sure to have that installed.
+Create an unprivileged user (here called wiki) who will be editing the wiki:
+<code>
+sudo useradd -m wiki
+sudo passwd wiki
+</code>
+Following https://www.linode.com/docs/websites/wikis/ikiwiki-on-arch-linux/
+===== Resizing a partition =====
+//Copied from  http://raspberrypi.stackexchange.com/a/501 //
+  * ''sudo fdisk /dev/mmcblk0''
+  * Type ''p'' to list the partition table
+<code>
+Device         Boot  Start      End  Sectors  Size Id Type
+/dev/mmcblk0p1        2048   206847   204800  100M  c W95 FAT32 (LBA)
+/dev/mmcblk0p2      206848 60588031 60381184 28.8G 83 Linux
+</code>
+  * Take note of the start number for partition 2 (if that's the one you want to resize)
+  * Type ''d'' to delete a partition. \\ You will then be prompted for the number of the partition you want to delete. In the case above you want to delete partition 2.
+  * Type ''n'' to create a new partition.
+  * This new partition needs to be a primary partition so type ''p''.
+  * Next enter ''2'' when prompted for a partition number.
+  * You will now be prompted for the first sector for the new partition. Enter the start number from the partition 2 you deleted before.
+  * Next you will be prompted for the last sector you can just hit enter to accept the default which will utilize the remaining disk space.
+  * Type ''w'' to save the changes you have made. (There will be some error showing saying: "Re-reading the partition table failed.: Device or resource busy", but no worries).
+  * Reboot the Pi: '' sudo reboot''
+  * Once the system has reboot and you are back at the commandline enter: ''sudo resize2fs /dev/mmcblk0p2'' Note: this can take a long time (epending on the card size and speed) be patient and let it finish.
+  * Reboot one more time.
+  * You can now verify that the system is using the full capacity of the SD Card by entering the following command: ''df -h''
+=== Why This Works ===
+Actually, when we delete a partition, we don't delete data, we just delete the reference to the partition in the partition table. By creating a new partition exactly from the same spot and of the same type, we keep the data but expanded the size to the full available space of the SD card.
+By resizing (which is safe to run on a mounted disk), we tell the file system to use all the space in the new partition.
+===== Python UnicodeEncodeError horror =====
+So your Python script works on your machine. But when you port it to a freshly installed Arch Linux Arm on a Pi, all hell breaks loose as soon as a weird character pops up. Something like this shows up:
+<code>UnicodeEncodeError: 'ascii' codec can't encode character '\xe9' in position 227: ordinal not in range(128)</code>
+Well, don't start modifying your Python code (as you said, it does not have that problem on your machine).  It's because the default locale of Arch Linux is ''LANG-C'' and what you want is UTF-8 support. There is many ways to solve this, including forcing Python to use a locale different from the system. But I like to have my systems with similar settings. So just follow tutorials [[https://wiki.archlinux.org/index.php/Locale|here]].