Mozc does not seem to work under VanillaOS

[0chroma]

Description

When using the linux distribution VanillaOS, mozc doesn't seem to work properly.

Steps to reproduce

Steps to reproduce the behavior:

1. install mozc via abroot pkg add ibus-mozc; abroot pkg apply
2. Enable mozc in gnome configuration panel
3. Attempt to type

Expected behavior

Mozc starts correctly and allows input

Actual behavior

The following dialogs appear:

"Failed to get current config values."
"Cannot start conversion engine. Please restart your computer."

Screenshots

n/a

Version or commit-id

2.28.4715.102

Environment

• OS: VanillaOS Orchid
• IMF: ibus
• Related Applications: all

Investigations

• Whether this issue happens on both Ibus and other IMF (e.g. Fcitx, uim).
  • no
• Whether this issue happens on other IMEs (e.g. Anthy, SKK).
  • does not appear to happen in Anthy
• What applications this issue happens on (e.g. Chromium, gedit).
  • all of them
• What applications this issue does not happen on (e.g. Chromium, gedit).
  • none found
• (optional) What versions or commit-ids this issue did not happen on
  (e.g. Mozc-2.28.4960.100+24.11.oss).
  • 2.28.4715.102

Additional context

It appears that it may be related to some sort of IPC setup, see the following strace excerpt:

......
[pid  6566] 01:25:17 openat(AT_FDCWD, "/etc/passwd", O_RDONLY|O_CLOEXEC) = 6
[pid  6566] 01:25:17 newfstatat(6, "", {st_mode=S_IFREG|0644, st_size=2670, ...}, AT_EMPTY_PATH) = 0
[pid  6566] 01:25:17 openat(AT_FDCWD, "/dev/shm/sem.fc32c9369a38", O_RDWR|O_NOFOLLOW|O_CLOEXEC) = -1 ENOENT (No such file or directory)
strace: Process 6569 attached
[pid  6566] 01:25:17 openat(AT_FDCWD, "/proc/self/task/6569/comm", O_RDWR) = 6
[libprotobuf ERROR google/protobuf/message_lite.cc:133] Can't parse message of type "mozc.commands.Input" because it is missing required fields: type
[libprotobuf ERROR google/protobuf/message_lite.cc:133] Can't parse message of type "mozc.commands.Input" because it is missing required fields: type
......

From what I know about VanillaOS, there's two major differences that could cause this. Either mozc doesn't like that /usr is a link to /.system/usr, or there's some file in the root FS it's expecting read/write access to but can only get read access.

The relevant bug report in VanillaOS is here, many of us would be happy to help diagnose further! Vanilla-OS/live-iso#68

[hiroyuki-komatsu]

Hi 0chroma,
Thank you for the report.

• 2.28.4715.102 is an old version more than 2 years ago.
• If protobuf is linked as a shared library, we highly recommend to link protobuf as a static library.

Could you please try the recent version with statically linked protobuf?

FYI. the log files are available at ~/.config/mozc/ (or ~/.mozc)

[0chroma]

thank you for the hint! I'll take a look at how the protobuf libs are being linked when I can

[yukawa]

Was there any update on this? I'm converting this to discussion as it seems there is no immediate action item in the Mozc side.

[0chroma]

no updates yet, since it's a debian package I don't have a ton of control over how the libraries are linked. It does work on debian though, I'm wondering if maybe a socket isn't getting shared correctly or something