Issue #2619158: Switch to the latest Drush 8 phar by default.

debian/aegir3-provision.postinst

@@ -51,27 +51,61 @@ case "$1" in
         # fix permissions on installed directories
         chown aegir:aegir "$VARLIB"
 
-        # Install composer.
-        COMPOSER_HOME="$HOME/.composer"
-        curl -sS https://getcomposer.org/installer | php
-        mv composer.phar /usr/local/bin/composer
-
         db_get "aegir/drush_version"
         DRUSH_VERSION="$RET"
+        DRUSH_MAJOR_VERSION=$(echo $DRUSH_VERSION| cut -d. -f1)
+
+        if [ "$DRUSH_VERSION" = "stable" ]; then
+
+            DRUSH_PHAR_URL="http://files.drush.org/drush.phar"
+
+        elif [ "$DRUSH_VERSION" = "unstable" ]; then
+
+            DRUSH_PHAR_URL="http://files.drush.org/drush-unstable.phar"
+
+        elif [ "$DRUSH_MAJOR_VERSION" -ge "8" ]; then
+
+            DRUSH_PHAR_URL="https://github.com/drush-ops/drush/releases/download/$DRUSH_VERSION/drush.phar"
+
+        fi
+
+        if [ -n "$DRUSH_PHAR_URL" ]; then
+
+            curl -Ss $DRUSH_PHAR_URL -o drush
+            chmod +x drush
+
+            DRUSH_PATH="/usr/local/bin/drush"
+
+            # Rename an old drush executable.
+            if [ -f $DRUSH_PATH ]; then
+              mv $DRUSH_PATH $DRUSH_PATH-old-$(date +'%Y-%m-%d')
+            fi
+
+            mv drush $DRUSH_PATH
+
+        else  # Drush versions prior to 8 aren't available as .phar's.
+
+            # Install composer.
+            COMPOSER_HOME="$HOME/.composer"
+            curl -sS https://getcomposer.org/installer | php
+            mv composer.phar /usr/local/bin/composer
+
+            # Install Drush.
+            su -c "composer global require drush/drush:$DRUSH_VERSION" aegir
+
+            # Add composer's bin dir to the $PATH.
+            echo "export PATH=\"\$HOME/.composer/vendor/bin:\$PATH\"" >>  ~aegir/.bashrc
 
-        # Install Drush.
-        su -c "composer global require drush/drush:$DRUSH_VERSION" aegir
+            # Rename an old drush executable.
+            if [ -f /usr/local/bin/drush ]; then
+              mv /usr/local/bin/drush /usr/local/bin/drush-old-$(date +'%Y-%m-%d')
+            fi
 
-        # Add composer's bin dir to the $PATH.
-        echo "export PATH=\"\$HOME/.composer/vendor/bin:\$PATH\"" >>  ~aegir/.bashrc
+            # Symlink Drush for other users to use.
+            ln -s ~aegir/.composer/vendor/bin/drush /usr/local/bin
 
-        # Rename an old drush executable.
-        if [ -f /usr/local/bin/drush ]; then
-          mv /usr/local/bin/drush /usr/local/bin/drush-old-$(date +'%Y-%m-%d')
         fi
 
-        # Symlink Drush for other users to use.
-        ln -s ~aegir/.composer/vendor/bin/drush /usr/local/bin
     ;;
 
     abort-upgrade|abort-remove|abort-deconfigure)

debian/aegir3-provision.templates

 Template:aegir/drush_version
 Type: string
-Default: 8.0.0
-Description: Drush version to use.
+Default: stable
+Description: Drush version to use. "stable" will fetch the latest release.
+  "unstable" will fetch the daily dev build. Otherwise, specify a version
+  number, e.g. "8.0.3".