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+---
+title: Automatically push Altium to GitHub
+author: Peter Tanner
+date: 2023-08-05 22:43:22 +0800
+categories: [Electronics] # Blogging | Electronics | Programming | Mechanical
+tags: [getting started, altium, github, git] # systems | embedded | rf | microwave | electronics | solidworks | automation
+---
+
+## Motivation
+
+Altium has their Altium365 cloud service, which includes Git version control. I wanted to mirror my Altium project to GitHub to add to my portfolio, since my GitHub currently has a lot of programming but not so much embedded projects to show.
+
+Adding a new remote is the most obvious solution.
+
+```bash
+git remote add gh https://github.com/OWNER/REPOSITORY.git    # gh remote is for github
+git push gh master
+```
+
+There are several issues:
+
+1. Altium does not work with `ssh` connections, only HTTPS. This is not a problem if you use HTTPS on GitHub.
+2. I had issues with Altium recognizing the `gh` remote as the primary remote, instead of the Altium 365 remote. Obviously, Altium doesn't seem designed to deal with multiple remotes.
+3. The largest issue is that Altium sets up the `user.email` with the format `$NAME@$DOMAIN@$MACHINE_NAME`. This email format is not accepted on GitHub, so the commits do not get attributed to your GitHub account, and they appear in a 'raw' form as:
+   > `$EMAIL` authored and `$EMAIL` comitted on `$DATE`.
+
+So I bodged together a script to resolve these issues which is probably against all good Git practice, but whatever (I'm not planning to have users contribute to the GitHub side - it will only be a read-only remote).
+
+```bash
+git filter-branch --env-filter '
+export GIT_AUTHOR_EMAIL=${GIT_AUTHOR_EMAIL%@*}
+export GIT_COMMITTER_EMAIL=${GIT_COMMITTER_EMAIL%@*}
+' --tag-name-filter cat -- --branches --tags
+```
+
+This command will re-write history to remove everything after the second `@` symbol, including the machine name. As we are re-writing history, copy the repository to a new directory. Do not modify the original, since rewriting history is risky and Altium probably relies on the format including the machine name.
+
+Anyway I ChatGPT'd the rest, but it
+
+1. Copy all directories in a csv (`$directory_name,$remote_url`) to a `ZZZ_GITHUB` directory. Projects which are already in the github directory are compared by revision, and if the github copy is out of date then it is copied over.
+2. Reset `--hard`, since the script will be run rarely and a project might be modified but not committed.
+3. Rewrite history, remove machine name from author and committer emails.
+4. Add new remote and push.
+
+Here's the script, enjoy
+
+```bash
+#!/bin/bash
+
+# Step 1: Create the "ZZZ_GITHUB" folder if it doesn't exist
+mkdir -p ZZZ_GITHUB
+
+# Step 2: Read the list of repository names from "repositories_list.txt" and copy only the listed repositories
+while IFS=',' read -r directory remote_url || [ -n "$directory" ]; do
+    echo "Processing repository: $directory"
+    source_dir="$directory"
+    target_dir="ZZZ_GITHUB/$directory"
+
+    # Check if the source directory is a valid Git repository
+    if [ -d "$source_dir/.git" ] && git -C "$source_dir" rev-parse --is-inside-work-tree >/dev/null 2>&1; then
+        # Check if the target directory is not present or is out of date
+        if [ ! -d "$target_dir" ] || ! git -C "$source_dir" diff-index --quiet HEAD -- "$source_dir"; then
+            # Copy the repository to ZZZ_GITHUB
+            echo "Copy: $directory . . ."
+            rm -rf "$target_dir"
+            cp -r "$source_dir" "$target_dir"
+            echo "Repository copied: $directory"
+            git -C "$target_dir" reset --hard HEAD
+            git -C "$target_dir" filter-branch --env-filter '
+            export GIT_AUTHOR_EMAIL=${GIT_AUTHOR_EMAIL%@*}
+            export GIT_COMMITTER_EMAIL=${GIT_COMMITTER_EMAIL%@*}
+            ' --tag-name-filter cat -- --branches --tags
+            git -C "$target_dir" remote set-url origin "$remote_url"
+            git -C "$target_dir" push --force origin HEAD
+            echo "Copied repository pushed to the remote: $directory"
+        else
+            echo "Repository is up to date: $directory"
+        fi
+    else
+        echo "Invalid Git repository or directory not found: $directory"
+    fi
+done < repositories_list.txt
+```
+
+You can see this script working for the [STM32WLE5 development board](https://github.com/peter-tanner/STM32WLE5-development-board).