How do I open vault located in a read-only directory (Linux)?

Help Desktop App
1

I have a vault that is inside a mounted ready-only directory. Without going too much into detail, I can say that I cannot make it not read-only (it’s a snapshot). But that’s not the problem. The problem is that Cryptomator is not able to open that vault. If I try to open it, I see the following error:

Error Code 91OE:CPM8:CPM8
java.nio.file.FileSystemException: /run/user/1000/pika-backup/mount/60d50452/d144ea-98194cfa/media/me/backup/c: Read-only file system
	at java.base/sun.nio.fs.UnixException.translateToIOException(Unknown Source)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(Unknown Source)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(Unknown Source)
	at java.base/sun.nio.fs.UnixFileSystemProvider.createDirectory(Unknown Source)
	at java.base/java.nio.file.Files.createDirectory(Unknown Source)
	at java.base/java.nio.file.Files.createAndCheckIsDirectory(Unknown Source)
	at java.base/java.nio.file.Files.createDirectories(Unknown Source)
	at org.cryptomator.cryptofs@2.7.1/org.cryptomator.cryptofs.common.FileSystemCapabilityChecker.determineSupportedCiphertextFileNameLength(FileSystemCapabilityChecker.java:136)
	at org.cryptomator.cryptofs@2.7.1/org.cryptomator.cryptofs.common.FileSystemCapabilityChecker.determineSupportedCiphertextFileNameLength(FileSystemCapabilityChecker.java:113)
	at org.cryptomator.desktop@1.14.2/org.cryptomator.common.vaults.Vault.createCryptoFileSystem(Vault.java:120)
	at org.cryptomator.desktop@1.14.2/org.cryptomator.common.vaults.Vault.unlock(Vault.java:158)
	at org.cryptomator.desktop@1.14.2/org.cryptomator.ui.keyloading.KeyLoadingStrategy.use(KeyLoadingStrategy.java:79)
	at org.cryptomator.desktop@1.14.2/org.cryptomator.ui.unlock.UnlockWorkflow.call(UnlockWorkflow.java:76)
	at org.cryptomator.desktop@1.14.2/org.cryptomator.ui.unlock.UnlockWorkflow.call(UnlockWorkflow.java:34)
	at javafx.graphics@22.0.2/javafx.concurrent.Task$TaskCallable.call(Unknown Source)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$UniAccept.tryFire(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)

So before I open an issue, I thought I ask first. Maybe I missed something.

I am using Cryptomator Desktop 1.14.2 on Linux (Ubuntu 24.10), the Flatpak version.

2

Hi,

My research shows that cryptomator requires the ability to create files that are temporary and you can’t do that obviously in a read-only file system so I don’t think there is any way for you to mount a vault that is on a read-only snapshot.

3

As far as i know there is no issue for this. And from my point of view, your question is legit. So open away :wink: