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Common Linux shell commands

on November 16, 2011

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DCcduino usb drivers (CH340 / CH341 chipset)

I've just received my first arduino platform. It's a DCcduino board (a clone of Arduino Uno). As I had some difficulties to have it recognised by my MacBook, I decided to share its drivers. This card has a CH340 USB-to-serial chip. You can find drivers for this chip on the web site of the chinese manufacturer, here : http://www.wch.cn/downloads.php?name=pro&proid=5 Or download it directly from my Google Drive. The archive contains drivers for Mac, Linux and Windows platforms. https://drive.google.com/file/d/0B5okZr5AW4gaX2pZaWt6dVNaSFU/edit?usp=sharing I hope this will help somebody. UPDATE for Mac users with Yosemite : Please, follow this extra instructions : Install the CH340 driver Run the command in Terminal: sudo nvram boot-args="kext-dev-mode=1" Reboot

How to register SSL certificates in your JVM?

You wrote a Java program which needs to access to a external ressource through SSL (such as LDAPS or HTTPS)? Okay, this post is for you. The first thing you have to know is that the first time you established a secured connection to something, you (normally) have to accept the certificate used to encrypt the dialog. In apps with interaction with end users (such as a web browser), the user often see a popup which asks him to trust the certificate. But, if the secured connection is establised behind the scene (without any possibility to show a popup to somebody, such in batch process apps), the certificate must be trusted before establishing the connection. In Java, there's a wallet which contains trusted certificate. It is located in [JAVA_HOME]/jre/lib/security/cacerts I explain here how to extract the public key of a SSL certificate and how to register is in the cacerts file. Step 1 : let's extract the public key from a secured connection We will use OpenSSL fo...

How to Fix GIT PUSH ERROR: insufficient permission for adding an object to repository database .git/objects

I use git for all my projects and I have an on-premise git server in my company. This git is hosted on a Linux server. All developpers have a user account on this Linux machine attached to the developers group. My Jenkins server for CI/CD also has its own account on this Linux. My problem occurs when I make a Maven Release which tags source code on git, upadte project version on my pom.xml file and push it on git. I often have write permission issue. Let's do a small disgnostic. I open an ssh terminal on my git Linux with Jenkins account. I nagivate to a repository (a /opt/git/ subfolder - depending on your installation). Let's create a dummy file and check its ACL. cd /opt/git/my-project.git touch test ls -lisa test -rw-r--r-- 1 jenkins developers 34618 june. 23 2020 test We can see that only the owner can modify this file. Other uiers from the developers group could only read it. That's the problerm : we have to set default ACL on this folder. Okay, let...

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