Fix existing github repository to use ssh access instead of username/password

gitfixssh

#!/bin/bash

# A temporary script for a temporary problem.

# I have a bunch of github repositories that no longer work
# for git push because the original URL uses the deprecated
# username/password combo. This script repairs the remote 
# origin so it uses ssh.

# B9 August 2021

oldurl=$(git remote get-url origin)
if [[ -z "$oldurl" ]]; then
    echo "gitfixssh error: Git can't get the remote origin URL." >&2
    exit 1
fi

if [[ "$oldurl" == [email protected]:* ]]; then
    echo "gitfixssh: Repository already set to ssh access." >&2
    exit 0
fi
    
if [[ "$oldurl" != http*github.com/* ]]; then
    echo "gitfixssh error: Unrecognized remote origin url: '$oldurl'." >&2
    exit 1
fi
    
[email protected]:${oldurl#*github.com/}

echo "Old origin URL: '$oldurl'"
echo "New origin URL: '$url'"
echo "git remote set-url origin '$url'"
git remote set-url origin "$url"