Posted by jpluimers on 2017/04/07
Learned about the -www switch for ps: extra extra “unlimited” wide (a single -w gets you 132 columns).
ps auxwww
Actually, there is no need for www, ww just works:
–jeroen
Source: Starting a command with one more more spaces prevents it from going into the…
Posted in *nix, *nix-tools, Power User, ps | Leave a Comment »
Posted by jpluimers on 2017/04/07
A friend of mine is attending the QCon conference as well; I’m anxious to see his conference report and the future posts of Tim.
[WayBack] QCon London 2017: IoT insecurity, serverless computing, predicting technical debt, and why .NET Core depends on a 36,000 line C++ file « Tim Anderson’s ITWriting
via [WayBack] QCon London 2017 day 1 – tim anderson – Google+
–jeroen
Posted in Development, Software Development | Leave a Comment »
Posted by jpluimers on 2017/04/06
Found these then trying to create a new feature for https://github.com/Hexxeh/rpi-update:
–jeroen
Posted in bash, Development, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2017/04/06
Even though StackOverflow and StackExchange now have implemented their own ImageFlair, I still like the original imageFlair that Grumpydev made at Stack Overflow – Share Your Flair – Now in PNG! | GrumpyDev
Grumpydev Imageflair
Stackoverflow imageflair
Alas, the Grumpydev site doesn’t properly support https and Grumpydev cannot change it because of shared hosting limitations, so I wanted to host ImageFlair locally and even see if I could make it StackExchange aware:
Stackexchange flair
Well, I need to do that propertly another time as the first thing I bumped into was this:
PHP Fatal error: Call to undefined function imagecreatefrompng() in /srv/www/vhosts/pluimers.com-ssl/stackoverflow/imageFlair/imageFlair.php on line 42
For now I’ve fixed the first by installing php5-gd (although an SO answer suggests php-gd, openSuSE uses the php-version number for installing modules).
zypper install php5-gd php -m rcapache2 stop rcapache2 start rcapache2 status
This will install the module, check with php if it is indeed installed, then restart apache to let it use the updated module.
After that, I bumped into a second thing: the image is blank.
Blank imageFlair
I also bumped into a third thing: the .htaccess file rewrite doesn’t work:
https://www.pluimers.com/stackoverflow/imageFlair/so/1.png gave me a 404 error whereas https://www.pluimers.com/stackoverflow/imageFlair/imageFlair.php?userid=1&mode=so “works” (i.e. generates a blank image).
That one was sort of easy to solve.
First of all, apparently I didn’t have all the required apache modules installed. The not-so-easy part is that apache uses two different aliases for modules: the ones listed by apache2ctl -M 2>&1 | sort are in a different format than the ones you mention in .htaccess and .conf files. Oh and of course the -M (nor the -t -D DUMP_MODULES) aren’t listed ore hinted in the apachectl documentation: that would be too easy. They are listed in the httpd2 documentation.
The .htaccess file needs mod_rewrite and mod_expires, but apache2ctl names them rewrite_module and expires_module.
Enabling these was easy, but you have to remember that a2enmod strips the prefix/suffix of the module name (I already had expires_module (shared) installed so this only shows how to enable mod_rewrite):
a2enmod rewrite
rcapache2 stop
rcapache2 start
rcapache2 status
NB: mod_rewrite wasn’t enable by default and before enabling it, read about the risks of mod_rewrite.
Then it still didn’t work, and then it occurred to me that likely I didn’t even have Apache2 allow for using .htaccess as the regexes in the .htaccess were fine. And indeed: .htaccess wasn’t enabled according to the steps at Making sure .htaccess and mod_rewrite are working as they should | Bolt Documentation. And indeed, the Apache documentation indicates when (not) to use .htaccess.
By setting the AllowOverride to both FileInfo as specified by RewriteRule and Indexes as specified by ExpiresActive (trying to refrain from AllowOverride All) for only this specific directory, I think I struck the right balance:
| <Directory "/srv/www/vhosts/pluimers.com-ssl/stackoverflow/imageFlair"> | |
| # for .htaccess in that directory | |
| AllowOverride FileInfo Indexes | |
| </Directory> |
And the final thing is that the logic around StackExchange flair is a tad more complex than I hoped for. And on that bombshell…
–jeroen
Posted in *nix, Apache2, Development, Linux, openSuSE, PHP, Power User, Scripting, Software Development, SuSE Linux | 1 Comment »
Posted by jpluimers on 2017/04/05
When you search for raspberry pi firmware version check
Installing and running rpi-update will – besides updating the GPU firmware – also install vcgencmd, I got this result:
statler:~ # LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/vc/lib/ statler:~ # export LD_LIBRARY_PATH statler:~ # /opt/vc/bin/vcgencmd version Jul 15 2016 17:50:10 Copyright (c) 2012 Broadcom version efa728fef77ea14ceb1500caf0146395fa282a0f (clean) (release)
But I wanted to be able to run vcgencmd before installing updates.
openmamba indicates it’s part of their raspberrypi-utils package with sources in the raspberrypi-userland package tracing back to git://github.com/raspberrypi/userland.git which is at https://github.com/raspberrypi/userland.
So I had two choices: compile https://github.com/raspberrypi/userland or find the binaries that rpi-update installs and are already runnable. I went for the second first by digging in https://github.com/Hexxeh/rpi-update/blob/master/rpi-update which on one of the first lines points to https://github.com/Hexxeh/rpi-firmware where the binaries are stored under https://github.com/Hexxeh/rpi-firmware/tree/master/vc/softfp/opt/vc.
The logic for copying the files is in the update_vc_libs function. The calling do_update function updates a lot more, including the firmware. So I wrote a quick pull request to just download the userland binaries:
Feature SKIP_FIRMWARE for #220: forces SKIP_KERNEL=1 and also skip the kernel.img files and the kernel modules: This effectively only installs the userland and SDK.
Source: #220 feature `SKIP_FIRMWARE` by jpluimers · Pull Request #221 · Hexxeh/rpi-update
Hopefully it gets merged in. When not, then you can always take a look at the commit: #220 feature SKIP_FIRMWARE · jpluimers/rpi-update@5a2ec0b
Run these commands to get going:
cd /root/bin wget https://raw.githubusercontent.com/jpluimers/rpi-update/5a2ec0bc552436d58127cc20e3791cb5b90fd5ba/rpi-update chmod +x rpi-update SKIP_FIRMWARE=1 UPDATE_SELF=0 ./rpi-update
You should see this when updating:
*** Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS and Dom
*** We're running for the first time
*** Backing up files (this will take a few minutes)
*** Remove old firmware backup
*** As requested, not updating firmware and kernel modules
This update bumps to rpi-4.4.y linux tree
Be aware there could be compatibility issues with some drivers
Discussion here:
https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=144087
##############################################################
*** Downloading specific firmware revision (this will take a few minutes)
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 168 0 168 0 0 361 0 --:--:-- --:--:-- --:--:-- 362
100 51.2M 100 51.2M 0 0 1246k 0 0:00:42 0:00:42 --:--:-- 1446k
*** As requested, not updating firmware and kernel
*** As requested, not updating firmware and kernel modules
*** Updating VideoCore libraries
*** Using HardFP libraries
*** Updating SDK
*** Running ldconfig
*** Storing current firmware revision
*** Deleting downloaded files
*** Syncing changes to disk
*** If no errors appeared, your firmware was successfully updated to 818a860cf690d64c62d3227ad9c36d5867a671c2
*** A reboot is needed to activate the new firmware
And the final goal of checking the firmware version now works:
# LD_LIBRARY_PATH=/opt/vc/lib /opt/vc/bin/vcgencmd version Jul 15 2016 17:50:10 Copyright (c) 2012 Broadcom version efa728fef77ea14ceb1500caf0146395fa282a0f (clean) (release)
–jeroen
Posted in Development, Hardware Development, Linux, openSuSE, Raspberry Pi, SuSE Linux, Tumbleweed | Leave a Comment »
Posted by jpluimers on 2017/04/05
A friend of mine made the mistake to capture some CDs using WMA files and throwing away the CDs. His old Nokia could play them, but not his new iOS and Android devices.
ffmeg and bash to the rescue:
find . -iname "*.wma" -execdir bash -c 'NAME="{}" && ffmpeg -y -i "$NAME" -ab 192k "${NAME/.wma/.mp3}" -map_metadata 0:s:0 && rm "$NAME"' \;
Tricks used:
Posted in *nix, *nix-tools, Audio, bash, bash, Development, ffmpeg, Media, Power User, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2017/04/04
https://raw.githubusercontent.com/Hexxeh/rpi-update/master/rpi-update && sudo chmod +x /usr/bin/rpi-update
The above is suggested by Hexxeh/rpi-update: An easier way to update the firmware of your Raspberry Pi
This is what I did on my OpenSuSE Tumbleweed powered Raspberry Pi devices:
statler:~ # cd bin
statler:~/bin # wget https://raw.githubusercontent.com/Hexxeh/rpi-update/master/rpi-update
--2016-08-30 13:04:38-- https://raw.githubusercontent.com/Hexxeh/rpi-update/master/rpi-update
Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 151.101.36.133
Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|151.101.36.133|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 12022 (12K) [text/plain]
Saving to: ‘rpi-update’
rpi-update 100%[===================>] 11.74K --.-KB/s in 0.002s
2016-08-30 13:04:39 (6.36 MB/s) - ‘rpi-update’ saved [12022/12022]
statler:~/bin # ls -al
total 20
drwxr-xr-x 2 root root 4096 Aug 30 13:04 .
drwx------ 4 root root 4096 Aug 30 13:04 ..
-rw-r--r-- 1 root root 12022 Aug 30 13:04 rpi-update
statler:~/bin # chmod 755 rpi-update
statler:~/bin # ./rpi-update
*** Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS and Dom
*** Performing self-update
*** Relaunching after update
*** Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS and Dom
*** We're running for the first time
*** Backing up files (this will take a few minutes)
*** Backing up firmware
*** Backing up modules 4.1.19-1-rpi2
This update bumps to rpi-4.4.y linux tree
Be aware there could be compatibility issues with some drivers
Discussion here:
https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=144087
##############################################################
*** Downloading specific firmware revision (this will take a few minutes)
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 168 0 168 0 0 382 0 --:--:-- --:--:-- --:--:-- 382
100 51.2M 100 51.2M 0 0 1511k 0 0:00:34 0:00:34 --:--:-- 1298k
*** Updating firmware
*** Updating kernel modules
*** depmod 4.4.19+
*** depmod 4.4.19-v7+
*** Updating VideoCore libraries
*** Using HardFP libraries
*** Updating SDK
*** Running ldconfig
*** Storing current firmware revision
*** Deleting downloaded files
*** Syncing changes to disk
*** If no errors appeared, your firmware was successfully updated to 818a860cf690d64c62d3227ad9c36d5867a671c2
*** A reboot is needed to activate the new firmware
statler:~/bin # reboot
Then on the console:
U-Boot 2016.07 (Aug 12 2016 - 14:07:49 +0000)
DRAM: 880 MiB
RPI 2 Model B (0xa21041)
MMC: bcm2835_sdhci: 0
reading uboot.env
** Unable to read "uboot.env" from mmc0:1 **
Using default environment
In: serial
Out: lcd
Err: lcd
Net: Net Initialization Skipped
No ethernet found.
starting USB...
USB0: Core Release: 2.80a
scanning bus 0 for devices... 4 USB Device(s) found
scanning usb for storage devices... 0 Storage Device(s) found
scanning usb for ethernet devices... 1 Ethernet Device(s) found
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
Scanning mmc 0:2...
Found U-Boot script /boot.scr
2781 bytes read in 50 ms (53.7 KiB/s)
## Executing script at 02000000
switch to partitions #0, OK
mmc0 is current device
5352616 bytes read in 1003 ms (5.1 MiB/s)
6088968 bytes read in 1010 ms (5.7 MiB/s)
14226 bytes read in 138 ms (100.6 KiB/s)
Kernel image @ 0x1000000 [ 0x000000 - 0x51aca8 ]
## Flattened Device Tree blob at 00000100
Booting using the fdt blob at 0x000100
Using Device Tree in place at 00000100, end 00006891
Starting kernel ...
Uncompressing Linux... done, booting the kernel.
Welcome to openSUSE Tumbleweed 20160828 - Kernel 4.1.19-1-rpi2 (ttyAMA0).
statler login:
...
statler:~ # /opt/vc/bin/vcgencmd version
/opt/vc/bin/vcgencmd: error while loading shared libraries: libvchiq_arm.so: cannot open shared object file: No such file or directory
statler:~ # locate libvchiq_arm.so
-bash: locate: command not found
statler:~ # zypper install findutils-locate
....
statler:~ # locate libvchiq_arm.so
locate: can not stat () `/var/lib/mlocate/mlocate.db': No such file or directory
statler:~ # /usr/bin/updatedb
statler:~ # locate libvchiq_arm.so
/opt/vc/lib/libvchiq_arm.so
–jeroen
Posted in Development, Hardware Development, Raspberry Pi | Leave a Comment »
Posted by jpluimers on 2017/04/04
I wanted to compress a few files from the current directory in a zip file using the 7z.exe command-line version of 7zip.
The trick is about finding where 7z.exe is as the directory containing 7z.exe is not in the Windows PATH.
Notes:
7zExe as environment variable as it will class with %7 being a parameter.SortDateTime.bat fills the environment variables SortDate, SortTime and SortDateTime with the current values yyyymmdd, hhnnss and yyyymmddhhnnss for sortable archive namingsetlocal call SortDateTime.bat echo %SortDateTime% %SortDate%-%SortTime% for /f "usebackq tokens=2* delims= " %%c in (`reg query "HKEY_LOCAL_MACHINE\SOFTWARE\7-Zip" /v Path`) do ( set sevenzExe="%%d7z.exe" ) endlocal & if exist %sevenzExe% %sevenzExe% a -tzip _my-build.%SortDate%-%SortTime%.zip MyServer.exe MyServer.map MyClient.exe MyClient.map pause
–jeroen
Posted in Batch-Files, Development, Power User, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2017/04/03
A while ago, I bumped into
The list is at https://docs.google.com/spreadsheets/d/1HOV0JyhF5J6Cd3PmRCDg5eY8ytabSIEidQaJ_ryusXI/edit and has since then be updated.
One of my surprises is that most of the NiMh batteries have larger capacities can virtually all of the Alkaline ones.
–jeroen
Posted in LifeHacker, Power User | Leave a Comment »
Posted by jpluimers on 2017/04/03
I always forget which OS X versions there are and which names they use.
So via: OS X – Wikipedia, the free encyclopedia, I made this list where the first item points to the table in the above article and each subsequent item to the individual article on the version. I tried to find EOL dates, but that’s hard despite the overview at Apple security updates – Apple Support:
–jeroen
PS: EOL dates are as of 20160403.
Posted in Apple, Mac OS X / OS X / MacOS, Mac OS X 10.4 Tiger, Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion, OS X 10.10 Yosemite, OS X 10.11 El Capitan, OS X 10.8 Mountain Lion, OS X 10.9 Mavericks, Power User | 1 Comment »
The Wiert Corner - irregular stream of stuff 