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When I try to download/save files/attachments from Firefox/Thunderbird, I get a 0 byte file in my Downloads directory.

I have tried all possible permissions but no difference. In both cases, it works if I save to a folder outside my home directory (eg /tmp/downloads/) with the right permissions. My home directory is encrypted with fscrypt, not sure if this could be the issue.

This is on a fresh Disco minimal install. Firefox pre-installed, Thunderbird installed from default repositories. This issue doesn't affect any other programs.

Posted a bug report here but seems possibly not a bug: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1828011

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It is a confirmed bugs— you can see follow-up https://bugs.launchpad.net/firefox/+bug/1796661.

Someone describe steps to reproduce the problem, the detail is very similar to yours.

Steps to reproduce:

I encrypted my homedir (on Ubuntu 18.04) with fscrypt following this tutorial : https://tlbdk.github.io/ubuntu/2018/10/22/fscrypt.html Then, I try to download any file from internet with Firefox in my Download folder, in my homedir (or any encrypted folder).

Actual results:

The download instantly breaks. Only a 0kb file appears with the correct name.

Expected results:

The file should be downloaded correctly.

The http://tlbdk.github.io site owner has explaining what might cause the bugs to occurs.

The issue is because firefox does a rename from the /tmp folder to the encrypted home folder, right now fscrypt returns EPERM instead of EXDEV that would be normal when the operation can not complete because of crossing a mount point or in this case unencrypted to an encrypted folder.

Currently there's no proposed fix, so you can only wait.

A workaround is to bind /tmp to a folder within your home directory (may cause other issues), or as a tmpfs. According to this, a fix from fscrypt has been merged into Linux 5.1

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    Thanks Jim, don't know how I missed that. Not sure how much value my question adds, can delete it if need be, in the mean time accepting your answer. – carderne May 13 '19 at 11:32
  • For anyone else, I've got around this following tlbdk's suggestion (github.com/google/fscrypt/issues/76#issuecomment-456976770) by binding /tmp to a location in my home directory as follows: sudo mount -B ~/.tmp /tmp – carderne May 13 '19 at 12:19

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