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Fix Hydrogen failing to start

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We were mounting our own configuration to
`/usr/share/nginx/html/config.json`, which is a symlink to
`/tmp/config.json`. So we effectively mount our file to
`/tmp/config.json`.

When starting:

- if Hydrogen sees a `CONFIG_OVERRIDE` environment variable,
  it will try to save it into our read-only config file and fail.

- if Hydrogen doesn't see a `CONFIG_OVERRIDE` environment variable (the
  path we go through, because we don't pass such a variable),
  it will try to copy its bundled configuration (`/config.json.bundled`)
  to `/tmp/config.json`. Because our configuration is mounted as read-only, it will
  fail.

In both cases, it will fail with:

> cp: can't create '/tmp/config.json': File exists

Source: https://github.com/vector-im/hydrogen-web/blob/3720de36bbee8609ca7cf625e7b72dc44609e393/docker/dynamic-config.sh

We work around this by mounting our configuration on top of the bundled
one (`/config.json.bundled`). We then let Hydrogen's startup script copy
it to `/tmp/config.json` (a tmpfs we've mounted into the container) and use it from there.
This commit is contained in:
Slavi Pantaleev
2023-02-14 09:49:22 +02:00
parent 799cbb44fb
commit 64e2b26ed5
1 changed files with 1 additions and 1 deletions
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roles/custom/matrix-client-hydrogen/templates/systemd/matrix-client-hydrogen.service.j2
+1 -1
View File
@@ -24,7 +24,7 @@ ExecStart={{ devture_systemd_docker_base_host_command_docker }} run --rm --name
{% endif %}
--tmpfs=/tmp:rw,noexec,nosuid,size=10m \
--mount type=bind,src={{ matrix_client_hydrogen_data_path }}/nginx.conf,dst=/etc/nginx/nginx.conf,ro \
--mount type=bind,src={{ matrix_client_hydrogen_data_path }}/config.json,dst=/usr/share/nginx/html/config.json,ro \
--mount type=bind,src={{ matrix_client_hydrogen_data_path }}/config.json,dst=/config.json.bundled,ro \
{% for arg in matrix_client_hydrogen_container_extra_arguments %}
{{ arg }} \
{% endfor %}