Author: rchapin

Debian Package Management Cheat Sheet

Posted on by rchapin
  • List version of an installed package: dpkg -s docker-ce | grep Version
  • Show all available versions of a package: apt-cache madison <package>

Packages being held back because of phasing

Run the following command replacing the package in question

apt-get --with-new-pkgs upgrade <package-name

The following packages have been kept back

Try the following, in order. Each is less risky than the next. Stop as soon as you have fixed the problem.

Solution 1

apt-get --with-new-pkgs upgrade <list of packages kept back
→ Continue reading “Debian Package Management Cheat Sheet”

How to partially cherry-pick a commit in git

Posted on by rchapin

There are times when you need to cherry-pick a commit from another branch. Then there are times when you only need parts of that commit.

Following is how you can partly cherry-pick a commit to get only the changes that you need.

Get the patch for the entire commit. Include the -n for no commit so that it does not add it as a commit to your branch

git cherry-pick -n <commit

Then unstage the the changes from the cherry-picked → Continue reading “How to partially cherry-pick a commit in git”

Pancakes

Posted on by rchapin

Ingredients

  • 1 1/2 cups all-purpose flour
  • 3 1/2 teaspoons baking powder
  • 1 teaspoon salt
  • 1 tablespoon of honey
  • 2 cups milk
  • 1 egg
  • 3 tablespoons butter, melted

Directions

  1. In a large bowl, sift together the flour, baking powder, and salt.
  2. In a separate bowl, lightly whip the eggs and then add the milk, egg, and honey and mix
  3. Pour the wet mixture into the dry and mix until smooth.
  4. Heat a lightly oiled griddle or frying pan over medium high
→ Continue reading “Pancakes”

Banana Bread

Posted on by rchapin

If you wait until your bananas are sufficiently over-ripe they will have enough sugar that you don’t have to add much at all and it makes for a much healthier bread.

You can make a double batch, cut up and freeze and it will stay fresh a very long time. Simply remove a piece from the freezer and microwave on high for 45 seconds to a minute and it will taste like it just came out of the oven.

Ingredients

→ Continue reading “Banana Bread”

Go template that properly renders delimiters for a slice of structs

Posted on by rchapin

It is common to write go text/templates that range over a slice of objects to write out a list or array of items that are separated by some delimiter defined in the template.

In the case of a JSON array of objects, the cleanest output would be a , separating each object without a leading or trailing comma.

Because go template if statements are falsey in that a 0 value will evaluate to false you can write a template as → Continue reading “Go template that properly renders delimiters for a slice of structs”

Query nested arrays in PostgreSQL JSON data

Posted on by rchapin

The following is an example showing how to query multiple nested arrays in JSON data in a PostgreSQL database.

Given

CREATE TABLE sample_json (
  id serial PRIMARY KEY,
  name varchar(64),
  json_data json
);


INSERT INTO sample_json (name, json_data)
VALUES
	(
	'NA',
	'
	{
	    "location": "US",
	    "topLevelArray": [
	        {
	            "id": 1,
	            "secondLevelArray": [
	                {
	                    "key": "someKey",
	                    "operator": "=",
	                    "value": 10
	                },
	                {
	                    "key": "foo",
	                    "operator": ">=",
	                    "value": 5
	                },
	                {
	                    "key": "someOtherKey",
	                    "operator": ">",
	                    "value": 647
	                }
	            ]
	        },
	        {
	            "id":
→ Continue reading “Query nested arrays in PostgreSQL JSON data”

Chili Garlic Tofu with Broccoli

Posted on by rchapin

Ingredients

  • 2 14 oz packages of extra firm tofu
  • 2 TB olive oil
  • Salt & pepper, to taste
  • 4 garlic cloves, minced
  • 1 lb. broccoli florets
  • 2 TB Sambal Olek or chili paste
  • 4 TB honey
  • 1 TB low sodium soy sauce
  • 4 sheets roasted seaweed
  • 1 TB sesame seeds
  • 1.5 cups basmati rice

Directions

  1. Blot tofu with paper towels while pressing down slightly to release water. Slice into 1/2 inch thick pieces and blot again with paper towels.
  2. Sauce:
→ Continue reading “Chili Garlic Tofu with Broccoli”

Vegetarian Beef Tips and Asparagus Stir Fry

Posted on by rchapin

Ingredients

  • 2 bags Gardein Be’f Tips1
  • 1 1/4 cup soy sauce
  • 4 tablespoons vegetable oil
  • 3 cloves garlic, minced
  • 1 tablespoon ginger, minced
  • 1 teaspoon brown sugar
  • 1/2 red onion, chopped
  • 1 red bell pepper, chopped
  • approx 1 1/2 lbs of asparagus cut into 2 inch pieces
  • 2 tablespoons balsamic vinegar
  • 1 cup chicken broth
  • 2 teaspoons cornstarch
  • 4 cups cooked rice

Directions

  1. In a small bowl, combine soy sauce, and brown sugar and set aside
  2. Heat a skillet
→ Continue reading “Vegetarian Beef Tips and Asparagus Stir Fry”

How to set up a locally hosted git server and create new repositories

Posted on by rchapin

You may have code and configurations that are required to stay on premise. As a result, you will need to setup your own git server and create and manage repositories locally. Following is an overview of how to set that up.

We will leave aside server setup, configuration, and networking and assume that we have a machine on which we will host the repos, git-server, and machines that will clone, pull, and push updates, clients.

Setting up the

→ Continue reading “How to set up a locally hosted git server and create new repositories”

Setting up software RAID on Debian with mdadm

Posted on by rchapin

Software RAID has come a long way. Unless you have some very high-rate, high-volume, I/O workloads with SLAs that will otherwise cost you money, for the most part a software RAID will perform just fine. One of the primary benefits of using software RAID is the portability of your disks/data. If a box on which you have a software RAID dies somehow and at least some (depending on your RAID configuration) of drives survive, you can easily resurrect the RAID → Continue reading “Setting up software RAID on Debian with mdadm”

© 2005 Ryan Chapin