While gitlab-shell currently has a major version of v14, the module path
it exposes is not using that major version like it is required by the Go
standard. This makes it impossible for dependents to import gitlab-shell
as a dependency without using a commit as version.

Fix this by changing the module path of gitlab-shell to instead be
`gitlab.com/gitlab-org/gitlab-shell/v14` and adjust all imports
accordingly.

Changelog: fixed

- If an integer is specified, we assume that these are seconds
- A duration of format "500ms", "10s", "1m", etc... accepted

When gitlab-sshd has been introduced we've started running our
own SSH server. In this case we're able to cache and reuse
Gitaly connections and Registry.

It helps to reduce memory usage.

It adds correlation ids wherever possible

- We start supporting the "color" format for logs.
- We now respond to SIGHUP by reopening the log file.
- We now respect the log format when no log filename is specified.

Output to syslog in the event of logging system setup is preserved in
OpenSSH mode.

Changelog: added

They are going to be used to determine whether a server is alive
and ready to accept traffic

When interruption signal is sent, we are closing ssh listener to
prevent it from accepting new connections

Then after configured grace period, we cancel the context to
cancel all ongoing operations

Previously, opentracing (if configured) was initialized late in the
gitlab-shell process's lifespan, coming just before making a gRPC
call to Gitaly.

By moving the opentracing initialization to be at process startup, we
make it available for the whole process lifecycle, which is very useful
to gitlab-sshd, as it means we'll only call tracing.Initialize() once
on process startup, rather than once per SSH connection.

To get this working, we need to introduce a context to gitlab-sshd.
This carries the client/service name, but also carries an initial
correlation ID. The main outcome of this is that all calls to the
authorized_keys endpoint from a given gitlab-sshd process will now
share a correlation ID. I don't have a strong opinion about this either
way.

Changelog: fixed

Changelog: fixed

Add a basic monitoring endpoint to the sshd command.
* Listen on localhost port 9122 by default.
* Integrate build/version info.
* Update example config.

https://gitlab.com/gitlab-org/gitlab-shell/-/issues/121



Signed-off-by: Ben Kochie <superq@gmail.com>

Use "omitempty" to allow defaults in the config file to be correctly
passed. Without this, explicitly setting an empty default like an empty
string will not work. Needed in order to allow explicitly disabling some
settings.

Related to: https://gitlab.com/gitlab-org/gitlab-shell/-/issues/121



Signed-off-by: Ben Kochie <superq@gmail.com>