add APP_PERSISTENT_STORAGE env (#74)

Resolves: #33

---------

Signed-off-by: Andrey Borysenko <andrey18106x@gmail.com>

docs/tech_details/Deployment.rst

@@ -165,6 +165,7 @@ The following env variables are required and built automatically:
 	* ``APP_PROTOCOL`` - protocol ExApp is listening on (http|https)
 	* ``APP_HOST`` - host ExApp is listening on
 	* ``APP_PORT`` - port ExApp is listening on (randomly selected by AppAPI)
+	* ``APP_PERSISTENT_STORAGE`` - path to mounted volume for persistent data storage between ExApp updates
 	* ``IS_SYSTEM_APP`` - ExApp system app flag (true|false)
 	* ``NEXTCLOUD_URL`` - Nextcloud URL to connect to
 

lib/DeployActions/DockerActions.php

@@ -29,6 +29,7 @@ class DockerActions implements IDeployActions {
 		'APP_PROTOCOL',
 		'APP_HOST',
 		'APP_PORT',
+		'APP_PERSISTENT_STORAGE',
 		'IS_SYSTEM_APP',
 		'NEXTCLOUD_URL',
 	];
@@ -334,13 +335,15 @@ public function buildDeployParams(DaemonConfig $daemonConfig, \SimpleXMLElement
 			$oldEnvs = $this->extractDeployEnvs((array) $containerInfo['Config']['Env']);
 			$port = $oldEnvs['APP_PORT'] ?? $this->service->getExAppRandomPort();
 			$secret = $oldEnvs['APP_SECRET'];
+			$storage = $oldEnvs['APP_PERSISTENT_STORAGE'];
 			// Preserve previous devices or use from params (if any)
 			$devices = array_map(function (array $device) {
 				return $device['PathOnHost'];
 			}, (array) $containerInfo['HostConfig']['Devices']);
 		} else {
 			$port = $this->service->getExAppRandomPort();
 			$devices = $deployConfig['gpus'];
+			$storage = $this->buildDefaultExAppVolume($appId);
 		}
 
 		$imageParams = [
@@ -356,6 +359,7 @@ public function buildDeployParams(DaemonConfig $daemonConfig, \SimpleXMLElement
 			'protocol' => (string) ($infoXml->xpath('ex-app/protocol')[0] ?? 'http'),
 			'host' => $this->service->buildExAppHost($deployConfig),
 			'port' => $port,
+			'storage' => $storage,
 			'system_app' => (bool) ($infoXml->xpath('ex-app/system')[0] ?? false),
 			'secret' => $secret ?? $this->random->generate(128),
 		], $params['env_options'] ?? [], $deployConfig);
@@ -396,6 +400,7 @@ public function buildDeployEnvs(array $params, array $envOptions, array $deployC
 			sprintf('APP_PROTOCOL=%s', $params['protocol']),
 			sprintf('APP_HOST=%s', $params['host']),
 			sprintf('APP_PORT=%s', $params['port']),
+			sprintf('APP_PERSISTENT_STORAGE=%s', $params['storage']),
 			sprintf('IS_SYSTEM_APP=%s', $params['system_app']),
 			sprintf('NEXTCLOUD_URL=%s', $deployConfig['nextcloud_url'] ?? str_replace('https', 'http', $this->urlGenerator->getAbsoluteURL(''))),
 		];