MacOS QuckLook Plugin for Java class
Quick Look at Java classes!
This Quick Look plugin allows you to decompile Java class and look at the content.
Chef resources failing with wrong constant name
When trying to add a custom resource, no matter what, I always got a wrong constant name error, for example:
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resolving cookbooks for run list: ["01_test-cookbook"] Synchronizing Cookbooks: - test-cookbook (0.1.0) Installing Cookbook Gems: Compiling Cookbooks... ================================================================================ Recipe Compile Error in /home/jhartman/.chef/local-mode-cache/cache/cookbooks/test-cookbook/resources/append_line.rb ================================================================================ NameError --------- wrong constant name 01TestCookbookAppendLine Platform: --------- x86_64-linux-gnu |
It turned out to be an issue with my cookbook name: it’s not allowed to have a cookbook name starting with a number (as later, it’s converted into a class name).
So my cookbooks as below are causing the problems:
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drwxrwxr-x 8 jhartman jhartman 15 Apr 22 21:45 1_PreRequisites drwxrwxr-x 7 jhartman jhartman 14 Apr 22 23:38 2_OracleDB drwxrwxr-x 9 jhartman jhartman 16 May 3 18:12 3_NCC drwxrwxr-x 6 jhartman jhartman 13 Apr 22 22:22 4_PostInstallation |
They should be renamed into something else, for example:
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drwxrwxr-x 8 jhartman jhartman 15 Apr 22 21:45 A_PreRequisites drwxrwxr-x 7 jhartman jhartman 14 Apr 22 23:38 B_OracleDB drwxrwxr-x 9 jhartman jhartman 16 May 3 18:12 C_NCC drwxrwxr-x 6 jhartman jhartman 13 Apr 22 22:22 D_PostInstallation |
Note, inside the files, there are references to the names, so you may need to update them accordingly, for example using:
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$ find . -type f -print0 | xargs -0 sed -i 's/2_OracleDB/B_OracleDB/g' |
After this, no more strange errors after adding resources.
PS: When you work on MacOS, you may face another problem with your resources: MacOS trash files (._* or .DS_Store) are causing another (similarly looking) error. Take a look at this web page.
Prevent Mac hidden files being written to a shared storage
MacOS tends to trash mounted disks with number of useless hidden files (e.g. ._* or .DS_Store ). There were number of recipes in the Internet, some of them were working at some of time but are not anymore.
Below notes from my fights (at a moment of writing, on MacOS High Sierra 10.13.4 (17E199).
Removing the files when they are created
I used to apply a find . -name ... -print0 | xargs rm -0 combo but found that there is an built-in command to deal with these files:
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$ dot_clean . |
From the man:
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NAME dot_clean -- Merge ._* files with corresponding native files. SYNOPSIS dot_clean [-fmnsv] [--keep=[mostrecent|dotbar|native]] [dir ...] DESCRIPTION For each dir, dot_clean recursively merges all ._* files with their corresponding native files according to the rules specified with the given arguments. By default, if there is an attribute on the native file that is also present in the ._ file, the most recent attribute will be used. |
Preventing creating the files
On the MacOS side
NOTE: None of these solutions worked for me!
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$ defaults write com.apple.desktopservices DSDontWriteNetworkStores -bool true $ killall Finder |
As I wrote, this didn’t work at all to me.
On the SMB server side
It actually turned the only working solution for me. Just add to the share configuration section a veto file parameter, e.g.:
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$ sudo vi /etc/samba/smb.conf |
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[jhartman] path = /home/jhartman ..... veto files = /._*/.DS_Store/ |
And restart:
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$ sudo service smbd restart |
Note, after applying this change you will not be able anymore to use dot_clean command from your Mac as any requests towards these files (including deletion) will be silently ignored by your SMB server hence files will remain untouched!
Oracle 12c 32-bit client and direct GOT relocation R_386_GOT32 against `lxecerr’
When trying to install Oracle 12c 32-bit Client (12.1 or 12.2) on Oracle Linux 7.3 or 7.5, it throws error during linking static libraries:
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INFO: Start output from spawned process: INFO: ---------------------------------- INFO: INFO: /u01/app/oracle/product/12.2.0_client32/bin/genclntsh INFO: /bin/ld: /u01/app/oracle/product/12.2.0_client32/lib/libnls12.a(lxecg2e.o): direct GOT relocation R_386_GOT32 against `lxecerr' without base register can not be used when making a shared object /bin/ld: final link failed: Bad value INFO: collect2: error: ld returned 1 exit status INFO: genclntsh: Failed to link libclntshcore.so.12.1 INFO: make: *** [client_sharedlib] Error 1 |
Not very specific, I found only one reference in Oracle KM Doc ID 2246237.1.
Rootcause and resolution in there was:
REASON
SLES 12 SP2 ships with binutils 2.26 which breaks compatibility for certain shared library links.
SOLUTION
01) Update binutils package to version binutils-2.26.1-9.15.1 or later.
But in fact, I do have in my server binutils-2.27-27.base.el7.x86_64 .
Workaround is to downgrade the binutils:
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jhartman@sms.jhartman.pl:/home/jhartman$ sudo yum downgrade binutils* Loaded plugins: ulninfo Resolving Dependencies --> Running transaction check ---> Package binutils.x86_64 0:2.25.1-32.base.el7_4.2 will be a downgrade ---> Package binutils.x86_64 0:2.27-27.base.el7 will be erased ---> Package binutils-devel.x86_64 0:2.25.1-32.base.el7_4.2 will be a downgrade ---> Package binutils-devel.x86_64 0:2.27-27.base.el7 will be erased --> Finished Dependency Resolution Dependencies Resolved ================================================================================================================================================================================================================================================================================ Package Arch Version Repository Size ================================================================================================================================================================================================================================================================================ Downgrading: binutils x86_64 2.25.1-32.base.el7_4.2 ol7_latest 5.4 M binutils-devel x86_64 2.25.1-32.base.el7_4.2 ol7_latest 845 k Transaction Summary |
After this, the libs can be compiled and linked:
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oracle$ export ORACLE_HOME=/u01/app/oracle/product/12.2.0_client32 oracle$ /u01/app/oracle/product/12.2.0_client32/bin/genclntsh oracle$ |
I do believe that after finishing the installation, binutils can be upgraded again to the latest version (but not forget about this problem in case of installing the RSU).
PS: I’ve raised SR 3-17356002141 : Error when installing Oracle 32-bit client (direct GOT relocation R_386_GOT32 against `ipp_zcalloc’)
GitHub projects
Just to inform (in case when Google stop working one day 😃) that my public projects are stored on GitHub https://github.com/jaroslawhartman
Deleting unwanted time zones from Apple Calendar
When you add some timezones to your Apple Calendar, it’s somehow difficult to remove them and you end up with a list which you perhaps don’t need anymore:
How to remove them? Rather easy, but we need a plist editor (easiest way to get it is to install XCode). Once we have it, just type in your terminal
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$ open ~/Library/Preferences/com.apple.iCal.plist |
Find attribute RecentlyUsedTimeZones, unfold it and delete unwanted items:
Open Cisco Webex through Alfred workflow
A MacOS Alfred workflow to open a predefined Webex session.
Pre-requisites:
- Alfred – free
- Alfred Power Pack – commericial, but I strongly recommend
- Cisco Webex Workflow – download
Introduction
It’s pretty basic, but helps me to speed up a very common activity (which I always tend to do on very last second when a my conference call is about to start)…
So when I urgently need to open Webex conference, instead of searching through my browser bookmarks, just press Option-Space and type webex:
Then press Enter to get the list of your web conferences, for example:
Hit cursor down or up to select bridge you want to open and just press enter.
Installation
After downloading the workflow, just doubleclick the file and it will get imported to your Alfred.
Configuration
Ok, how you could add your most frequently used Webex URLs to the list? Navigate to Alfred workflows, find Webex workflow and select Open in Finder:
Then open configuration.txt in your text editor:
In the file, set your URLs in format <Name>|<URL>, for example Jarek|https://webex.com/joint/jarek.hartman:
Save and done!
Timezones mentioned as a favourite Alfred Workflow!
I’m glad to mention that Alfred Timezone workflow has been mentioned as a “Favourite” on Alfred’s workflows page https://www.alfredapp.com/workflows/ . Many thanks for this!
The workflow can be downloaded from downloads section.
Site migrated to a new server
Due to issues with my current hosting, I decided to move the site to a new server. This might be a temporary location but will decide after a few days.
Kindle Vocabulary Builder into Memrise
Introduction
A script to pull Kindle Vocabulary Builder DB and convert into Memrise course.
The latest Kindle Paperwhite (second generation) offers the Vocabulary Builder feature. With Vocabulary Builder, you can look up words with the dictionary and memorize their definitions.
For my self-education I use http://memrise.com/ (both on my phone and desktop PC). I thought it would be great to pull words which I’ve checkded when reading English books on my Kindle and push them into my Memrise course.
How does it work?
- The script reads through the vocab.db to look for all Engligh words (in table WORDS).
- Each of the words (aka stems) is used for a definition lookup in the Cambridge Dictionary
- Retreve word definitions, usage example, pronounciation, audio mp3 and insert into a new SQLite database
memrise.db(the mp3 is written to the disk only, folderaudio) - Each new word is written to a text file, in a format suitable for bulk words import into Memrise.
Pre-requisties
- Kindle Paperwhite (or newer)
vocab.dbfile (retrieved from your Kindle, from/Volumes/Kindle/system/vocabulary/)- python 3
- BeautifulSoup
References
I heavily sourced from two GitHub projects:
ToDOs
- Parametrize hardcoded things – especially language pair English-Polish
- Upload Audio files with prononciation
Usage
DB conversion using the script
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MBP:kindle-to-memrise jhartman$ ./kindle2memrise.py -h usage: kindle2memrise.py [-h] [-kindleDB KINDLEDB] [-dictionaryDB DICTIONARYDB] [-output OUTPUT] [-revision REVISION] [-debug] optional arguments: -h, --help show this help message and exit -kindleDB KINDLEDB Kindle vocabulary db filename (default: vocab.db) -dictionaryDB DICTIONARYDB Memrise dictionary db filename (default: memrise.db) -output OUTPUT Output file to import to memrise.com (default: memrise.txt) -revision REVISION Revision to output. Not specfied (default): last, 0 - all -debug Enable debug |
At minimum, the tool does not require any parameters, it will search for vocab.db in the current folder and will write output files into the same, current folder.
Pay your special attention to memrise.txt which has been generated:
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MBP:kindle-to-memrise jhartman$ tail memrise.txt mere Sam. Used to emphasize that something is not large or important. Example: It costs a mere twenty dollars. mɪər thinning Rozcieńczać, rozrzedzać. To make a substance less thick, often by adding a liquid to it. Example: N/A θɪn carnivore Zwierzę mięsożerne. An animal that eats meat. Example: N/A ˈkɑːnɪvɔːr embrace Obejmować (się). If you embrace someone, you put your arms around them, and if two people embrace, they put their arms around each other.. Example: We are always eager to embrace the latest technology. ɪmˈbreɪs |
This is the file, which will be used for bulk word add into your Course.
Bulk word add
Go to your Course, press Edit and in the Advanced options, look for Bulk add words:
Open memrise.txt in an editor (e.g. Notepad), select all, copy it and paste into Memrise Bulk Add form then press Add:
That’s it!
Download
Download the script from GitHub: https://github.com/jaroslawhartman/kindle-to-memrise