add startup-command script

Author: Philipp Kübler

Dockerfile

@@ -14,49 +14,49 @@ RUN apk info \
     && apk update \
     && apk upgrade \
     && apk add --no-cache --virtual .build-deps \
-        $PHPIZE_DEPS \
+    $PHPIZE_DEPS \
     && apk add --no-cache \
-        sudo \
-        runit \
-        nginx \
-        zlib-dev \
-        icu-dev \
-        imagemagick \
-        imagemagick-dev \
-        libzip-dev \
-        libjpeg-turbo-dev \
-        libpng-dev \
-        libxml2-dev \
-        freetype-dev \
-        bash \
-        git \
-        nodejs \
-        composer \
-        php7-tokenizer \
-        php7-simplexml \
-        php7-dom \
-        mysql-client \
-        yarn@edge \
-        xvfb \
-        chromium@3.9 \
-        chromium-chromedriver@3.9 \
+    sudo \
+    runit \
+    nginx \
+    zlib-dev \
+    icu-dev \
+    imagemagick \
+    imagemagick-dev \
+    libzip-dev \
+    libjpeg-turbo-dev \
+    libpng-dev \
+    libxml2-dev \
+    freetype-dev \
+    bash \
+    git \
+    nodejs \
+    composer \
+    php7-tokenizer \
+    php7-simplexml \
+    php7-dom \
+    mysql-client \
+    yarn@edge \
+    xvfb \
+    chromium@3.9 \
+    chromium-chromedriver@3.9 \
     && docker-php-ext-configure gd --with-freetype --with-jpeg \
     && docker-php-ext-install -j$(nproc) \
-        gd \
-        pdo_mysql \
-        zip \
-        bcmath \
-        exif \
-        intl \
-        opcache \
-        pcntl \
-        iconv \
+    gd \
+    pdo_mysql \
+    zip \
+    bcmath \
+    exif \
+    intl \
+    opcache \
+    pcntl \
+    iconv \
     && pecl install \
-        redis \
-        imagick \
+    redis \
+    imagick \
     && docker-php-ext-enable \
-        redis \
-        imagick \
+    redis \
+    imagick \
     && apk del .build-deps
 
 # fix iconv (see https://github.com/docker-library/php/issues/240#issuecomment-305038173)
@@ -90,6 +90,9 @@ COPY ./etc/nginx/ /etc/nginx/
 COPY ./usr/local/etc/php/ /usr/local/etc/php/
 COPY ./usr/local/etc/php-fpm.d/ /usr/local/etc/php-fpm.d/
 
+# copy bin files
+COPY ./usr/local/bin/startup-commands.php /usr/local/bin/
+
 # configure composer
 ENV COMPOSER_ALLOW_SUPERUSER=1 \
     COMPOSER_MEMORY_LIMIT=-1

usr/local/bin/startup-commands.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * A very simple script in charge of generating the startup commands based on environment variables.
+ * The script is run on each start of the container.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2018 TheCodingMachine
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+$commands = array_filter($_SERVER, function(string $key) {
+    return strpos($key, 'STARTUP_COMMAND') === 0;
+}, ARRAY_FILTER_USE_KEY);
+
+ksort($commands);
+
+echo "set -e\n";
+
+
+// Let's run the commands as user $UID if env variable UID is set.
+
+foreach ($commands as $command) {
+    $line = $command;
+    if (isset($_SERVER['UID'])) {
+        $line = 'sudo -E -u \\#'.$_SERVER['UID'].' bash -c '.escapeshellarg($line);
+    }
+    echo $line."\n";
+}