migrate_github_to_codeberg.sh

#!/bin/bash
#
# GitHub to Codeberg Migration Script
# ------------------------------------
#
# Author: Rahul Martim Juliato
# Email: rahul.juliato@gmail.com
# License: GPL-3.0
# Version: 0.1.2
#
# This script migrates GitHub repositories to Codeberg.
#
# User Configuration:
# --------------------
# GitHub username and personal access token
# GITHUB_USERNAME="YourGitHubUsername"
# GITHUB_TOKEN="YourGitHubToken"
#
# Codeberg username and personal access token
# CODEBERG_USERNAME="YourCodebergUsername"
# CODEBERG_TOKEN="YourCodebergToken"
#
# Define the REPOSITORIES array with repository names you want to migrate
# Leave it blank to migrate all repositories, or create a list of repositories
# if you want to select specific ones.
# REPOSITORIES=(
#     "repository1"
#     "repository2"
#     "repository3"
# )
#
# Custom prefix for description
# DESCRIPTION_PREFIX=""
# or something like:
# DESCRIPTION_PREFIX="[MIRROR] "
#
# Usage:
# ------
# 1. Configure the user settings at the beginning of the script.
# 2. Run the script.
# 3. Follow the on-screen instructions to proceed with the migration.
#
# Note: Make sure to have 'curl' and 'jq' installed.
#
# Press ENTER to continue, or C-c to abort.
#
# -----------------------------------------------------------

# USER CONFIGURATION
#---------------------------------------------------------------------------

# GitHub username and personal access token
GITHUB_USERNAME="YourGitHubUsername"
GITHUB_TOKEN="YourGitHubToken"

# Codeberg username and personal access token
CODEBERG_USERNAME="YourCodebergUsername"
CODEBERG_TOKEN="YourCodebergToken"

# Define the REPOSITORIES array with repository names you want to migrate
# Leave it blank so you migrate ALL repositories. Create a one per line list
# if you want to select the repositories to migrate.

REPOSITORIES=()
# REPOSITORIES=(
#     "repository1"
#     "repository2"
#     "repository3"
# )

# Define the OWNERS array with specific user names whose repositories you want to migrate
# Leave it blank so you migrate ALL repositories. Create a one per line list
# if you want to select the repositories to migrate.

OWNERS=()
# OWNERS=(
#     "owner1"
#     "owner2"
# )

# Custom prefix for description
DESCRIPTION_PREFIX=""
# DESCRIPTION_PREFIX="[Secondary] - "
# DESCRIPTION_PREFIX="Draft: "

# UTILS FUNCTIONS
#---------------------------------------------------------------------------
array_contains() {
    local array="$1[@]"
    local seeking=$2
    local in=1
    for element in "${!array}"; do
        if [[ $element == "$seeking" ]]; then
            in=0
            break
        fi
    done
    return $in
}

# PROCESSING
#---------------------------------------------------------------------------
printf "\n    ----------------------------------------------"
printf "\n    Welcome to Github to Codeberg Migration Script"
printf "\n    ----------------------------------------------\n"
printf "\n    User on Github          : $GITHUB_USERNAME"
printf "\n    User on Codeberg        : $CODEBERG_USERNAME"
printf "\n    Using description prefix: $DESCRIPTION_PREFIX"
if [ ${#OWNERS[@]} -eq 0 ]; then
    printf "\n    Migrating repos owned by: all users"
else
    printf "\n    Migrating repos owned by: %s" "${OWNERS[@]}"
fi
if [ ${#REPOSITORIES[@]} -eq 0 ]; then
    printf "\n    Migrating repo          : all"
else
    printf "\n    Migrating repos         : %s" "${REPOSITORIES[@]}"
fi
printf "\n"
printf "\n    If you wish to change this, abort and change this script.\n\n"
printf "\n\n    Press ENTER to continue, C-c to abort.\n\n"
read
printf ">>> Working...\n"

# NOTE: Github api paginates to max 100 repositories, this calculates how many
#       runs (pages) we're going to do to fetch all user data.
GITHUB_PAGINATION=100
github_total_repos=$(curl -s -H "Authorization: token $GITHUB_TOKEN" "https://api.github.com/user" | jq '.public_repos + .total_private_repos')
github_needed_pages=$((($github_total_repos + $GITHUB_PAGINATION - 1) / $GITHUB_PAGINATION))

# Start Migration to Codeberg
for ((github_page_counter = 1; github_page_counter <= github_needed_pages; github_page_counter++)); do

    repos=$(curl -s -H "Authorization: token $GITHUB_TOKEN" "https://api.github.com/user/repos?per_page=${GITHUB_PAGINATION}&page=${github_page_counter}")

    echo "$repos" | jq -c '.[]' | while read -r row; do
        repo_name=$(echo "$row" | jq -r '.name')

        # Skips current processing repo if
        #                                 A) it is not on the wanted list
        #                             or  B) and you're migrating 'all'
        if ! array_contains REPOSITORIES "$repo_name" && [ ${#REPOSITORIES[@]} -ne 0 ]; then
            continue
        fi

        repo_owner=$(echo "$row" | jq -r '.owner.login')
        # Skips current processing repo if
        #                                 A) it is not owned by a targeted user
        #                                 B) no specific users are targeted
        if ! array_contains OWNERS "$repo_owner" && [ ${#OWNERS[@]} -ne 0 ]; then
            continue
        fi

        repo_clone_url=$(echo "$row" | jq -r '.clone_url')
        repo_description="$DESCRIPTION_PREFIX$(echo "$row" | jq -r '.description')"
        repo_is_private=$(echo "$row" | jq -r '.private')

        printf ">>> Migrating: $repo_name ($([ "$repo_is_private" = "true" ] && echo "private" || echo "public"))...\n"

        json_payload=$(jq -n \
            --arg auth_username "$GITHUB_USERNAME" \
            --arg auth_token "$GITHUB_TOKEN" \
            --arg clone_addr "$repo_clone_url" \
            --argjson private "$repo_is_private" \
            --arg repo_name "$repo_name" \
            --arg repo_owner "$CODEBERG_USERNAME" \
            --arg description "$repo_description" \
            '{
                auth_username: $auth_username,
                auth_token: $auth_token,
                clone_addr: $clone_addr,
                private: $private,
                repo_name: $repo_name,
                repo_owner: $repo_owner,
                service: "github",
                description: $description
            }')

        response=$(curl -s -w "\n%{http_code}" -X POST -H "Content-Type: application/json" -H "Authorization: token $CODEBERG_TOKEN" -d "$json_payload" "https://codeberg.org/api/v1/repos/migrate")

        response_body=$(echo "$response" | head -n -1)
        http_status=$(echo "$response" | tail -n 1)

        case $http_status in
        201)
            printf " Success!\n"
            ;;
        409)
            printf " Error! Already exists on Codeberg.\n"
            ;;
        403)
            printf "Error! Forbidden.\n"
            ;;
        *)
            error_message=$(echo "$response_body" | jq -r '.message // empty' 2>/dev/null)
            if [ -n "$error_message" ]; then
                printf "Error: %s (HTTP %s)\n" "$error_message" "$http_status"
            else
                printf "Error: Unknown! %s\n" "$http_status"
            fi
            ;;
        esac

    done
done

echo ">>> Migration script completed!"