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Git SSH Authentication
If we want to use different authentication keys for a particular Git repo, we can edit the config
file of the repo and add the sshCommand
setting.
Navigate to the repository’s Git configuration directory:
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cd /path/to/repo/.git |
In the folder there’s a file called config
. We are interested in the core
section. To use a particular SSH key for Git, we would write the command as shown below. Replace the name of the key file with your own.
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[core] ... ... ... sshCommand = ssh -i ~/.ssh/my_custom_git_key |
Perspective on Computer Hardware Advancements
Excerpt from The Clean Coder by Robert Martin
“One of the first machines I ever wrote programs for was a PDP-8/I. This machine had a 1.5-microsecond cycle time. It had 4096 12-bit words in core memory. It was the size of a refrigerator and consumed a significant amount of electrical power. It had a disk drive that could store 32K of 12-bit words, and we talked to it with a 10-character-per-second teletype. We thought this was a powerful machine, and we used it to work miracles.
I just bought a new Macbook Pro laptop. It has a 2.8GHz dual core processor, 8GB of RAM, a 512GB SSD, and a 17-inch 1920x1200 LED screen. I carry it in my backpack. It sits on my lap. It consumes less than 85 watts.
My laptop is eight thousand times faster, has two million times more memory, has sixteen million times more offline storage, requires 1% of the power, takes up 1% of the space, and costs one twenty-fifth of the price of the PDP-8/I.”
gcloud configuration and projects
Prerequisite: Google Cloud SDK should be installed. See the docs here.
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$ gcloud version Google Cloud SDK 250.0.0 app-engine-go app-engine-python 1.9.86 beta 2019.05.17 bq 2.0.43 cloud-datastore-emulator 2.1.0 core 2019.06.07 gsutil 4.38 |
gcloud
project configurations are typically stored in the following folder in files with prefix config_
. For example: config_my-project-name
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$ cd ~/.config/gcloud/configurations && ls -la -rw-r--r-- 1 penkovski staff 83 Apr 19 09:17 config_default -rw-r--r-- 1 penkovski staff 83 Apr 19 09:17 config_my-project-name |
To add a new project configuration, run the gcloud init
command and follow the instructions.
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gcloud init |
After successfully selecting the desired project and options, a new config file will appear in the configurations folder. To switch the active configuration for a new project use the following command:
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gcloud config configurations activate my-project-name |
Set the currently active project:
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$ gcloud config set project my-project-name Updated property [core/project]. |
Get the currently active project:
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$ gcloud config get-value project Your active configuration is: [my-project-name] my-project-name |
Golang Multi Package Test Coverage in Gitlab
As part of a Go
unit testing CI job, we can generate code coverage statistics. For Gitlab to display them, we must provide appropriate output from the job’s script
commands (stdout). Below is a sample CI test job:
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On line 5 we run the go test
command and specify that we would like to generate coverage profile and save it in a file called coverage.out
On line 6 we use the go tool cover
command to generate (stdout) output broken down by function. Example output is shown below:
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Start GoLand From Terminal
With Visual Studio Code and other text editors, we can directly open the editor from the terminal shell with the current folder opened as a project.
For example, I can change to a folder and start it like this:
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$ cd myfolder $ code . |
To make GoLand support the same workflow, we can do the following steps.
Hugo Gitlab CI for Gitlab Pages
This post describes how to integrate a Hugo project repo with Gitlab CI and deploy the built site on Gitlab Pages automatically. If you host your static site on another platform/server, the actions you’ll need to do might be slightly different. In all cases, the major thing is to specify how the public
folder of the project will be uploaded to the frontend server. These configurations are declarative and abide to the rules of the .gitlab-ci.yml specification.
Gitlab Pages is a free service to host one static web site per Gitlab project. The site will have a default domain consisting of our Gitlab username and project name: https://myusername.gitlab.io/myproject
Custom domains are supported.
First impressions of Hugo
Hugo is great
Fast, instant refresh, markdown, templates, layouts and great configuration.
What more can we ask for?
I would say more clear guidelines on how to deal with Hugo themes.
Beginner’s difficulties with Hugo themes
The docs describe a sample quickstart site with a predefined theme. If we follow, we’re easily good to go with a new site. Yet, probably we would like to use a different theme.
So we go to https://themes.gohugo.io/ and find a lovely one. I’m using the Jane theme from xianmin.
Google Play Services 10002 Error
The following post may be helpful to resolve the 10002 RESULT_SIGN_IN_FAILED
error.
If you have changed or pre-installed your development machine and have installed a fresh Android Studio version, you’ll have a new debug.keystore
created by the Android Studio installation.
The apps that are started directly from the IDE during development will no longer be signed with keys registered with Google Play Services. This is no issue if the app doesn’t use Google Play Services like Sign-in, Leaderboards or Achievements, but if it does, these functionalities will no longer work and you may get the 10002 RESULT_SIGN_IN_FAILED
error.
Enable Shift+Numpad Navigation for Ubuntu 18.04
Open terminal and execute the following command.
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setxkbmap -option 'numpad:microsoft' |
Other helpful shortcuts are Ctrl+Alt+Arrow when you want to navigate back or forth after peeking into function defintions and going back to previous functions. In Ubuntu 18.04 by default these shortcuts are taken by the system. To make them available for use in text editors, use the following commands.
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gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-left "[]" gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-right "[]" |