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+#!/bin/bash
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+
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+#=================================================
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+# PACKAGE UPDATING HELPER
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+#=================================================
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+
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+# This script is meant to be run by GitHub Actions
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+# The YunoHost-Apps organisation offers a template Action to run this script periodically
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+# Since each app is different, maintainers can adapt its contents so as to perform
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+# automatic actions when a new upstream release is detected.
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+
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+# Remove this exit command when you are ready to run this Action
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+#exit 1
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+
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+#=================================================
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+# FETCHING LATEST RELEASE AND ITS ASSETS
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+#=================================================
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+
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+# Fetching information
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+current_version=$(cat manifest.json | jq -j '.version|split("~")[0]')
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+repo=$(cat manifest.json | jq -j '.upstream.code|split("https://github.com/")[1]')
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+# Some jq magic is needed, because the latest upstream release is not always the latest version (e.g. security patches for older versions)
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+version=$(curl --silent "https://api.github.com/repos/$repo/releases" | jq -r '.[] | select( .prerelease != true ) | .tag_name' | sort -V | tail -1)
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+assets=($(curl --silent "https://api.github.com/repos/$repo/releases" | jq -r '[ .[] | select(.tag_name=="'$version'").assets[].browser_download_url ] | join(" ") | @sh' | tr -d "'"))
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+
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+# Later down the script, we assume the version has only digits and dots
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+# Sometimes the release name starts with a "v", so let's filter it out.
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+# You may need more tweaks here if the upstream repository has different naming conventions.
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+if [[ ${version:0:1} == "v" || ${version:0:1} == "V" ]]; then
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+ version=${version:1}
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+fi
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+
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+# Setting up the environment variables
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+echo "Current version: $current_version"
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+echo "Latest release from upstream: $version"
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+echo "VERSION=$version" >> $GITHUB_ENV
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+# For the time being, let's assume the script will fail
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+echo "PROCEED=false" >> $GITHUB_ENV
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+
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+# Proceed only if the retrieved version is greater than the current one
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+if ! dpkg --compare-versions "$current_version" "lt" "$version" ; then
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+ echo "::warning ::No new version available"
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+ exit 0
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+# Proceed only if a PR for this new version does not already exist
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+elif git ls-remote -q --exit-code --heads https://github.com/$GITHUB_REPOSITORY.git ci-auto-update-v$version ; then
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+ echo "::warning ::A branch already exists for this update"
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+ exit 0
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+fi
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+
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+# Each release can hold multiple assets (e.g. binaries for different architectures, source code, etc.)
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+echo "${#assets[@]} available asset(s)"
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+
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+#=================================================
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+# UPDATE SOURCE FILES
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+#=================================================
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+
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+# Here we use the $assets variable to get the resources published in the upstream release.
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+# Here is an example for Grav, it has to be adapted in accordance with how the upstream releases look like.
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+
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+# Let's loop over the array of assets URLs
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+for asset_url in ${assets[@]}; do
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+
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+echo "Handling asset at $asset_url"
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+
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+# Assign the asset to a source file in conf/ directory
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+# Here we base the source file name upon a unique keyword in the assets url (admin vs. update)
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+# Leave $src empty to ignore the asset
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+case $asset_url in
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+ *"admin"*)
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+ src="app"
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+ ;;
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+ *"update"*)
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+ src="app-upgrade"
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+ ;;
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+ *)
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+ src=""
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+ ;;
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+esac
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+
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+# If $src is not empty, let's process the asset
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+if [ ! -z "$src" ]; then
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+
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+# Create the temporary directory
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+tempdir="$(mktemp -d)"
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+
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+# Download sources and calculate checksum
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+filename=${asset_url##*/}
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+curl --silent -4 -L $asset_url -o "$tempdir/$filename"
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+checksum=$(sha256sum "$tempdir/$filename" | head -c 64)
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+
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+# Delete temporary directory
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+rm -rf $tempdir
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+
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+# Get extension
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+if [[ $filename == *.tar.gz ]]; then
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+ extension=tar.gz
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+else
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+ extension=${filename##*.}
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+fi
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+
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+# Rewrite source file
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+cat <<EOT > conf/$src.src
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+SOURCE_URL=$asset_url
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+SOURCE_SUM=$checksum
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+SOURCE_SUM_PRG=sha256sum
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+SOURCE_FORMAT=$extension
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+SOURCE_IN_SUBDIR=true
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+SOURCE_FILENAME=
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+EOT
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+echo "... conf/$src.src updated"
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+
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+else
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+echo "... asset ignored"
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+fi
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+
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+done
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+
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+#=================================================
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+# SPECIFIC UPDATE STEPS
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+#=================================================
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+
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+# Any action on the app's source code can be done.
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+# The GitHub Action workflow takes care of committing all changes after this script ends.
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+
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+#=================================================
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+# GENERIC FINALIZATION
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+#=================================================
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+
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+# Replace new version in manifest
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+echo "$(jq -s --indent 4 ".[] | .version = \"$version~ynh1\"" manifest.json)" > manifest.json
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+
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+# No need to update the README, yunohost-bot takes care of it
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+
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+# The Action will proceed only if the PROCEED environment variable is set to true
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+echo "PROCEED=true" >> $GITHUB_ENV
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+exit 0
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ericgaspar