snap fails to refresh a snap when a home directory is encrypted with fscrypt

[Laurent Bonnaud]

Hi,

on my system snap sometimes fails to refresh a snap with the following error messages:

# snap refresh
error: cannot perform the following tasks:
- Copy snap "chromium" data (cannot copy "/home/bonnaudl/snap/chromium/1117" to "/home/bonnaudl/snap/chromium/1149": failed to copy all: "'/home/bonnaudl/snap/chromium/1117' -> '/home/bonnaudl/snap/chromium/1149'\ncp: cannot create directory '/home/bonnaudl/snap/chromium/1149/.config': Required key not available\ncp: cannot create directory '/home/bonnaudl/snap/chromium/1149/.local': Required key not available\n'/home/bonnaudl/snap/chromium/1117/.themes' -> '/home/bonnaudl/snap/chromium/1149/.themes'\ncp: cannot create symbolic link '/home/bonnaudl/snap/chromium/1149/.themes': Required key not available\n'/home/bonnaudl/snap/chromium/1117/.last_revision' -> '/home/bonnaudl/snap/chromium/1149/.last_revision'\ncp: cannot open '/home/bonnaudl/snap/chromium/1117/.last_revision' for reading: Required key not available\ncp: cannot create directory '/home/bonnaudl/snap/chromium/1149/Downloads': Required key not available\ncp: cannot create directory '/home/bonnaudl/snap/chromium/1149/.pki': Required key not available" (1))

According to those error messages, snap is not able to handle my home directory that is encrypted with fscrypt.

$ fscrypt status .
"." is encrypted with fscrypt.

Policy: c036e60805532bcc
Options: padding:32 contents:AES_256_XTS filenames:AES_256_CTS
Unlocked: Yes

Protected with 1 protector:
PROTECTOR LINKED DESCRIPTION
6b76ac84fec508fe No login protector for bonnaudl

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: snapd 2.44.3+20.04
Uname: Linux 5.6.11-050611-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Sat May 9 18:51:12 2020
SourcePackage: snapd
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.sudoers.d.99-snapd.conf: [inaccessible: [Errno 13] Permission denied: '/etc/sudoers.d/99-snapd.conf']

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Yu Lou (louyu1999)]

Similar error (Required key not available) while trying to refresh gnome-system-monitor. I also encrypt my home directory with fscrypt using login protector.