Added Linux mount script (issue #4)

src/main/java/org/cryptomator/frontend/webdav/mount/LinuxGvfsMounter.java

@@ -2,31 +2,40 @@
 
 import java.io.IOException;
 import java.net.URI;
+import java.net.URISyntaxException;
 import java.util.Map;
+import java.util.concurrent.TimeUnit;
 
 import javax.inject.Inject;
 import javax.inject.Singleton;
 
 import org.apache.commons.lang3.SystemUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 @Singleton
 class LinuxGvfsMounter implements MounterStrategy {
 
+	private static final Logger LOG = LoggerFactory.getLogger(LinuxGvfsMounter.class);
+	private static final String DEFAULT_GVFS_SCHEME = "dav";
+
 	@Inject
 	LinuxGvfsMounter() {
 	}
 
 	@Override
 	public boolean isApplicable() {
 		if (!SystemUtils.IS_OS_LINUX) {
+			// fail fast (non-blocking)
 			return false;
 		}
 
 		// check if gvfs is installed:
 		assert SystemUtils.IS_OS_LINUX;
 		try {
-			ProcessBuilder checkDependencies = new ProcessBuilder("which", "gvfs-mount", "xdg-open");
-			Process checkDependenciesProcess = checkDependencies.start();
+			ProcessBuilder checkDependenciesCmd = new ProcessBuilder("which", "gvfs-mount", "xdg-open");
+			Process checkDependenciesProcess = checkDependenciesCmd.start();
+			ProcessUtil.waitFor(checkDependenciesProcess, 500, TimeUnit.MILLISECONDS);
 			ProcessUtil.assertExitValue(checkDependenciesProcess, 0);
 			return true;
 		} catch (CommandFailedException | IOException e) {
@@ -36,8 +45,61 @@ public boolean isApplicable() {
 
 	@Override
 	public Mount mount(URI uri, Map<MountParam, String> mountParams) throws CommandFailedException {
-		// TODO Auto-generated method stub
-		throw new CommandFailedException("not yet implemented.");
+		try {
+			URI schemeCorrectedUri = new URI(mountParams.getOrDefault(MountParam.PREFERRED_GVFS_SCHEME, DEFAULT_GVFS_SCHEME), uri.getSchemeSpecificPart(), null);
+			ProcessBuilder mountCmd = new ProcessBuilder("sh", "-c", "gvfs-mount \"" + schemeCorrectedUri.toASCIIString() + "\"");
+			Process mountProcess = mountCmd.start();
+			ProcessUtil.waitFor(mountProcess, 5, TimeUnit.SECONDS);
+			ProcessUtil.assertExitValue(mountProcess, 0);
+			LOG.debug("Mounted {}", schemeCorrectedUri.toASCIIString());
+			return new MountImpl(schemeCorrectedUri);
+		} catch (IOException e) {
+			throw new CommandFailedException(e);
+		} catch (URISyntaxException e) {
+			throw new IllegalStateException("URI constructed from elements known to be valid.", e);
+		}
+	}
+
+	private static class MountImpl implements Mount {
+
+		private final ProcessBuilder revealCmd;
+		private ProcessBuilder isMountedCmd;
+		private final ProcessBuilder unmountCmd;
+
+		private MountImpl(URI uri) {
+			this.revealCmd = new ProcessBuilder("sh", "-c", "gvfs-open \"" + uri.toASCIIString() + "\"");
+			this.isMountedCmd = new ProcessBuilder("sh", "-c", "test `gvfs-mount --list | grep \"" + uri.toASCIIString() + "\" | wc -l` -eq 1");
+			this.unmountCmd = new ProcessBuilder("sh", "-c", "gvfs-mount -u \"" + uri.toASCIIString() + "\"");
+		}
+
+		@Override
+		public void unmount() throws CommandFailedException {
+			try {
+				Process isMountedProcess = isMountedCmd.start();
+				ProcessUtil.waitFor(isMountedProcess, 1, TimeUnit.SECONDS);
+
+				if (isMountedProcess.exitValue() == 0) {
+					// only unmount if volume is still mounted, noop otherwise
+					Process proc = unmountCmd.start();
+					ProcessUtil.waitFor(proc, 1, TimeUnit.SECONDS);
+					ProcessUtil.assertExitValue(proc, 0);
+				}
+			} catch (IOException e) {
+				throw new CommandFailedException(e);
+			}
+		}
+
+		@Override
+		public void reveal() throws CommandFailedException {
+			try {
+				Process proc = revealCmd.start();
+				ProcessUtil.waitFor(proc, 2, TimeUnit.SECONDS);
+				ProcessUtil.assertExitValue(proc, 0);
+			} catch (IOException e) {
+				throw new CommandFailedException(e);
+			}
+		}
+
 	}
 
 }

src/test/java/org/cryptomator/frontend/webdav/MirroringTest.java

@@ -36,6 +36,7 @@ public static void main(String[] args) throws IOException, CommandFailedExceptio
 
 				Map<MountParam, String> mountOptions = new HashMap<>();
 				mountOptions.put(MountParam.WIN_DRIVE_LETTER, "X:");
+				mountOptions.put(MountParam.PREFERRED_GVFS_SCHEME, "dav");
 				Mount mount = servlet.mount(mountOptions);
 				mount.reveal();