Posted by jpluimers on 2016/09/08
50 years ago the first of an amazing series got broadcasted.
Space the final frontier.
Original series: Star Trek – Wikipedia, the free encyclopedia
Image source: tumbex – adorkable-mandi.tumblr.com : #Star Trek
via: Source: Space……. :) For those who don’t get it… – “Space.. the final fronti…
–jeroen
Posted in Fun, History, Quotes, T-Shirt quotes | Leave a Comment »
Posted by jpluimers on 2016/09/08
Coping with OpenSSL is frustrating on so many levels. It would be hilarious if not so many depended on it.
The main thing is that there is so much cruft in openssl but nobody seemingly to care enough about copying with that cruft. Though the intentions of the LibreSSL are great and it has far left cruft, it didn’t gain enough ground in the 2+ years it exists.
For me, the biggest problem was that OpenSSL would fail to build on “modern” OS X versions. These lack makedepend which was part of OS X, but got removed somewhere between 2006 and 8.0 in 2012. Luckily, the 2006 post also mentions the alternative: gcc -M.
Actually
cc -Morclang -Mwork just as well asccsymlinks toclangandgcccallsclangwith some parameters.
OpenSSL references makedepend in a lot of Makefiles (see list below). The good part is that config and Configure modify the Makefiles so most people use a manual workaround after running Configure or revert to a macports built or other binaries of makedepend or a homebrew formula.
That is not really an automated solution suitable for general use, let alone suitable for Continuous Integration, so I dug a bit deeper: config is a shell script and Configure is a sherl script: a cleverly crafted shell script starting with the below line invoking Perl with the rest of the script. The reason is that #! shebangs need an absolute location which for Perl can vary. A nice discussion on this trick is at Running Under Some Shell which contains a more elaborate how this works:
Posted in bash, Development, Makefile, Perl, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2016/09/07
I figured this out, it turned out to be a DNS resolution issue. For some reason leaving ‘search localdomain’ in resolv.conf generates some slowness. I’m not sure if it’s because 127.0.0.1 isn’t mapped to ‘localhost.localdomain’ in /etc/hosts by default, or whatever, but taking it out fixes the performance issue.
Source: TUMBLEWEED Poor performance in VMware Fusion
–jeroen
Posted in *nix, Linux, openSuSE, Power User, SuSE Linux, Tumbleweed | Leave a Comment »
Posted by jpluimers on 2016/09/07
This succeeded: https://openqa.opensuse.org/tests/overview?distri=opensuse&version=Tumbleweed&build=20160901&groupid=1 installing the image from http://download.opensuse.org/tumbleweed/iso/openSUSE-Tumbleweed-DVD-x86_64-Current.iso.mirrorlist (for which the md5 and sha signatures match).
But I got this cd:/content: Invalid signature. Installation aborted. message:
After a few statements [WayBack] in the install shell:
mkdir /mnt/cd
mount /dev/cdrom /mnt/cd
cd /mnt/cd
gpg --import content.key
gpt --verify content.asc
Indeed the cd:/content didn’t verify as content.key wasn’t a trusted signature:
–jeroen
Posted in *nix, Linux, openSuSE, Power User, SuSE Linux, Tumbleweed | Leave a Comment »
Posted by jpluimers on 2016/09/07
Yes, people still do this: Screenshot 2016-09-07 15.59.24.png
This one is worse than the usual “Yes/No” questions missing one or more of the “Yes” or “No” buttons in that it actually mentions you can click “No”.
Load SSH Key?
Do you have an SSH kkey that you’d like to load now? If not you can click “No” and create one later if you like”.
Posted in DVCS - Distributed Version Control, git, Mercurial/Hg, Software Development, SourceTree | Leave a Comment »
Posted by jpluimers on 2016/09/07
Oddest OpenSuSE Tumbleweed installation screen colours ever…
Source: Screenshot 2016-09-07 15.51.08.png
Posted in Linux, openSuSE, Power User, SuSE Linux, Tumbleweed | Leave a Comment »
Posted by jpluimers on 2016/09/07
I need to read this later when I’m going to fiddle with my 3D printer: The Oracle at Delphi: 3D Printer – The Temperature Controller
Source: Allen Bauer – Google+
–jeroen
Posted in Development, Hardware Development | Leave a Comment »
Posted by jpluimers on 2016/09/07
The Oracle to_date() function has saved me numerous times parsing date time strings into datetime values like this:
to_date('29/07/2015 13:18:00', 'DD/MM/YYYY HH24:MI:SS')
One gotcha is that when you query back the resulting date-time values, they might be formatted differently because of NLS_DATE_FORMAT settings
In addition to the query for ‘nls_date_format’ mentioned in sql – Oracle to_date() incorrect output – Stack Overflow, I usually use this one:
select v.*
from v$parameter v
where name like 'nls_%'
order by lower(v.name)
;
–jeroen
Posted in Database Development, Development, OracleDB, Software Development | Leave a Comment »
Posted by jpluimers on 2016/09/06
I’ve published the Delphi version info table as a Gist: https://gist.github.com/jpluimers/b5891600b73642788b492393710c6070.
Note I need help with these:
The updated script that forms the base of this table is here: https://bitbucket.org/jeroenp/wiert.me/src/tip/Native/Delphi/Scripts/List-Delphi-Installed-Packages.ps1
You can pass any of these args to get information
An elaborate wrapper around the Define column is jedi.inc which is used in many projects (both open source and closed source) to distinguish between various Delphi versions, libraries and platforms at compile time (URL: github.com/project-jedi/jedi/blob/master/jedi.inc)
Posted in .NET, C#, C# Builder, Delphi, Delphi 10 Seattle, Delphi 10.1 Berlin (BigBen), Delphi 2005, Delphi 2006, Delphi 2007, Delphi 2009, Delphi 2010, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Delphi XE8, Development, Software Development | 5 Comments »
Posted by jpluimers on 2016/09/06
One thing I’ve not figured out yet is this: How does enabling btrfs quotas impact the system? – Unix & Linux Stack Exchange
My gut feeling says it’s not much. But if someone knows: please chime in.
Anyway: btrfs quota support helps you to see how big snapshots (and other subvolumes) are.
Enabling and disabling is easy (the slash is the path from where to enable quota):
btrfs quota enable /
btrfs quota disable /
The bad thing is that there is no command that gives just the quota status. You have to revert to btrfs qgroup show /
This will show you quota groups when quota are enabled:
qgroupid rfer excl -------- ---- ---- 0/5 16.00KiB 16.00KiB
or errors when quota are disabled either of these two errors:
# btrfs qgroup show / ERROR: can't perform the search - No such file or directory ERROR: can't list qgroups: No such file or directory # btrfs qgroup show / ERROR: can't list qgroups: quotas not enabled
You might also want to check the syslogs as there was a [PATCH 1/2] btrfs: syslog when quota is enabled.
The btrfs qgroup output is the base for agronick/btrfs-size: A script that will print out a list of BTRFS subvolumes along with their size in megabytes and their name.
It actually shows it in human readable form (kilo/mega/giga/… bytes) and is documented at Get the size of your BTRFS Snapshots | PoisonPacket. It gives me a nice overview that corresponds to the snapper list output (see below).
The script has two drawbacks:
./btrfs-size/btrfs-size.sh: line 55: can't + 0: syntax error: invalid arithmetic operator (error token is "'t + 0")
btrfs quota enable / to actually deliver the quota for all the qgroupid values snapper uses. Until that time, the columns ID/Total/Exclusive Data are empty.
# btrfs qgroup show / > /dev/null
WARNING: Qgroup data inconsistent, rescan recommended
In that case, run btrfs quota rescan / and wait for it to complete by running this command until the warning is gone:
# btrfs qgroup show / > /dev/null
WARNING: Rescan is running, qgroup data may be incorrect
If the warning reverts to WARNING: Qgroup data inconsistent, rescan recommended then you might see the effects from this bug and should not worry about it: Bug 933428 – btrfs qgroup – allways shows WARNING: Qgroup data inconsistent.
For more btrfs quota background information, see: UseCases – btrfs Wiki.
–jeroen
Posted in *nix, *nix-tools, bash, Development, Linux, openSuSE, Power User, Scripting, Software Development, SuSE Linux, Tumbleweed | 1 Comment »
The Wiert Corner - irregular stream of stuff 