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You can add git tag to a previous commit using git tag TAG_NAME COMMIT_HASH, but it will ammend current date to that tag which can screw your repository by making out of chronological order. Don’t worry, You may fix this using the code below.

git tag -l | while read -r tag ; do COMMIT_HASH=$(git rev-list -1 $tag) && GIT_COMMITTER_DATE="$(git show $COMMIT_HASH --format=%aD | head -1)" git tag -a -f $tag -m"$(git show $COMMIT_HASH --format=%s | head -1)" $COMMIT_HASH ; done && git push --tags --force

You may need to change the DateTime of a commit in some situations. For example, some countries use daylight saving time period and because of it, some of the commits can have the wrong timestamp.

git commit --amend --date "Thu Feb 15 22:37:31 2018 +0300"

Ubuntu 18.04, aka Bionic Beaver, was released on 26 April 2018. In this post, I will try to explain how do I upgrade my Ubuntu server. I will also inform you about how I overcome the obstacles related python hosting.

Sometimes you want to get rid of from all python packages. There is a quick and easy way to do this. The command below will also remove the packages installed via VCS.

pip freeze | grep -v "^-e" | xargs pip uninstall -y

Today I have a small disagreement with GIT and git ignore rules. When you add a file to a GIT repository, it is tracked by GIT. Then adding it to .gitignore won’t make GIT forget about that file.

In this post, I will explain how to stop GIT from tracking a file that is already tracked.

Imagine that you’re working on a big feature in your app. Then you get a critical bug ticket that should be resolved immediately. You don’t want to commit the messy code. You just want to save your dirty working environment, do urgent things and go back it. For this, you can use git stash command.

I have experienced a disaster on my web server a few days ago. While trying to remove one of my dev databases, I have removed the production database accidentally. I was extremely lucky because I duplicated production database to the local one to test a python script and I have all my web app’s content in the GIT history which you shouldn’t. Because it is not the best practice to put web app’s content to the VCS.

There are a lot of ways to generate random values. But some of them are not suitable for secret keys. There is a new module named secrets in version 3.6 and later. You can use the code below to generate cryptographically strong random values.

import secrets
secrets.token_hex()

These folder and files are generated by python. You should add these to your VCS’s ignore file. But if you need to clean these manually, you can do with the command below:

find . | grep -E "(__pycache__|\.pyc|\.pyo$)" | xargs rm -rf