From 8c7d57b4867142537a5f7224256969f9ffa935f3 Mon Sep 17 00:00:00 2001
From: tituspijean <tituspijean@outlook.com>
Date: Mon, 7 Feb 2022 21:58:49 +0100
Subject: [PATCH] Add n auto-updater

---
 .github/workflows/n_updater.sh  | 75 +++++++++++++++++++++++++++++++++
 .github/workflows/n_updater.yml | 46 ++++++++++++++++++++
 2 files changed, 121 insertions(+)
 create mode 100644 .github/workflows/n_updater.sh
 create mode 100644 .github/workflows/n_updater.yml

diff --git a/.github/workflows/n_updater.sh b/.github/workflows/n_updater.sh
new file mode 100644
index 000000000..0ea226888
--- /dev/null
+++ b/.github/workflows/n_updater.sh
@@ -0,0 +1,75 @@
+#!/bin/bash
+
+#=================================================
+# N UPDATING HELPER
+#=================================================
+
+# This script is meant to be run by GitHub Actions.
+# It is derived from the Updater script from the YunoHost-Apps organization.
+# It aims to automate the update of `n`, the Node version management system.
+
+#=================================================
+# FETCHING LATEST RELEASE AND ITS ASSETS
+#=================================================
+
+# Fetching information
+source helpers/nodejs
+current_version="$n_version"
+repo="tj/n"
+# Some jq magic is needed, because the latest upstream release is not always the latest version (e.g. security patches for older versions)
+version=$(curl --silent "https://api.github.com/repos/$repo/releases" | jq -r '.[] | select( .prerelease != true ) | .tag_name' | sort -V | tail -1)
+
+# Later down the script, we assume the version has only digits and dots
+# Sometimes the release name starts with a "v", so let's filter it out.
+if [[ ${version:0:1} == "v" || ${version:0:1} == "V" ]]; then
+    version=${version:1}
+fi
+
+# Setting up the environment variables
+echo "Current version: $current_version"
+echo "Latest release from upstream: $version"
+echo "VERSION=$version" >> $GITHUB_ENV
+# For the time being, let's assume the script will fail
+echo "PROCEED=false" >> $GITHUB_ENV
+
+# Proceed only if the retrieved version is greater than the current one
+if ! dpkg --compare-versions "$current_version" "lt" "$version" ; then
+    echo "::warning ::No new version available"
+    exit 0
+# Proceed only if a PR for this new version does not already exist
+elif git ls-remote -q --exit-code --heads https://github.com/${GITHUB_REPOSITORY:-YunoHost/yunohost}.git ci-auto-update-n-v$version ; then
+    echo "::warning ::A branch already exists for this update"
+    exit 0
+fi
+
+#=================================================
+# UPDATE SOURCE FILES
+#=================================================
+
+asset_url="https://github.com/tj/n/archive/v${version}.tar.gz"
+
+echo "Handling asset at $asset_url"
+
+# Create the temporary directory
+tempdir="$(mktemp -d)"
+
+# Download sources and calculate checksum
+filename=${asset_url##*/}
+curl --silent -4 -L $asset_url -o "$tempdir/$filename"
+checksum=$(sha256sum "$tempdir/$filename" | head -c 64)
+
+# Delete temporary directory
+rm -rf $tempdir
+
+echo "Calculated checksum for n v${version} is $checksum"
+
+#=================================================
+# GENERIC FINALIZATION
+#=================================================
+
+# Replace new version in helper
+sed -i -E "s/^n_version=.*$/n_version=$version/" helpers/nodejs
+
+# The Action will proceed only if the PROCEED environment variable is set to true
+echo "PROCEED=true" >> $GITHUB_ENV
+exit 0
diff --git a/.github/workflows/n_updater.yml b/.github/workflows/n_updater.yml
new file mode 100644
index 000000000..0253ca02d
--- /dev/null
+++ b/.github/workflows/n_updater.yml
@@ -0,0 +1,46 @@
+# This workflow allows GitHub Actions to automagically update YunoHost NodeJS helper whenever a new release of n is detected.
+name: Check for new n releases
+on:
+  # Allow to manually trigger the workflow
+  workflow_dispatch:
+  # Run it every day at 5:00 UTC
+  schedule:
+    - cron:  '0 5 * * *'
+jobs:
+  updater:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fetch the source code
+        uses: actions/checkout@v2
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Run the updater script
+        id: run_updater
+        run: |
+          # Setting up Git user
+          git config --global user.name 'yunohost-bot'
+          git config --global user.email 'yunohost-bot@users.noreply.github.com'
+          # Run the updater script
+          /bin/bash .github/workflows/updater.sh
+      - name: Commit changes
+        id: commit
+        if: ${{ env.PROCEED == 'true' }}
+        run: |
+          git commit -am "Upgrade n to v$VERSION"
+      - name: Create Pull Request
+        id: cpr
+        if: ${{ env.PROCEED == 'true' }}
+        uses: peter-evans/create-pull-request@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: Update n to version ${{ env.VERSION }}
+          committer: 'yunohost-bot <yunohost-bot@users.noreply.github.com>'
+          author: 'yunohost-bot <yunohost-bot@users.noreply.github.com>'
+          signoff: false
+          base: testing
+          branch: ci-auto-update-n-v${{ env.VERSION }}
+          delete-branch: true
+          title: 'Upgrade n to version ${{ env.VERSION }}'
+          body: |
+            Upgrade `n` to v${{ env.VERSION }}
+          draft: false