Fossil

`--sshtrace`: (Sets `g.fSshTrace`.)

`--ssl-identity SSLIDENTITY`:

`--systemtrace`: (Sets `g.fSystemTrace`.) Trace all commands launched
as sub processes.

`--user LOGIN`: (Sets `g.zLogin`) Also `-U LOGIN`. Set the user name
used with the repository.

`--utc`: Override the `timeline-utc` option to explicitly use
UTC time.

`--vfs VFSNAME`: Load the named VFS into SQLite.

-----------------------

### CGI and JSON Parameters


The JSON API implementation looks up many values in the first of
several places searched. This unifies the parameter handling logic,
allows the caller to choose whether to prefer URL parameters, request
headers, or the POST payload, and allows the `fossil json` command to
share most of the same logic as the `/json` API path. The search order
is a POST payload, GET/COOKIE/non-JSON POST, JSON POST, the system
environment.

See the comment above the implementation of [`json_getenv`][json.c]
for some further discussion.

[json.c]: /artifact/6df1d80dece8968b?ln=277,290

### Comment Editor

The editor used to edit a check-in or stash comment is named by the
local or global setting `editor`. If neither is set, then the environment
variables `VISUAL`, and `EDITOR` are checked in that order.

On Windows, if no editor is named, then Notepad is used. Note that the
operation will be aborted if `notepad.exe` is not found in the Windows
folder.

On Unix-like platforms, if no editor is named, then a message is
displayed on stdout, and stdin is read until a single line containing
only a dot is seen.



















































### Error logging

If logging errors to a file, fossil will include the values of the
following environment variables in the error log entry if they are
defined: `HTTP_HOST`, `HTTP_USER_AGENT`, `PATH_INFO`, `QUERY_STRING`,
`REMOTE_ADDR`, `REQUEST_METHOD`, `REQUEST_URI`, and `SCRIPT_NAME`.



### Fossil Username

In absence of any explicit setting, fossil will use the same name you
logged in to your platform with, as the user name when interacting
with local and remote repositories. Note that only the name is shared,
fossil makes no attempt to share or leverage any platform's
authentication mechanisms or passwords.

When logging in to a repository, it tries a series of sources for the
user name, and the first non-blank name that succeeds is the logged in
user. The order is:

1.  The --user and -U command-line options.
2.  If running within an open checkout (the local database is open),
    check in its table of values stored per open checkout for the
    value stored by `fossil user default USERNAME`.
3.  The default user in the repository (setting `default-user`)
4.  The `FOSSIL_USER` environment variable.
5.  The `USER` environment variable.
6.  The `LOGNAME` environment variable.
7.  The `USERNAME` environment variable.
8.  Check if the user can be extracted from the remote URL, if
    there is a remote URL.

Items 2 and 3 are both set by `fossil user default USERNAME`, the
first within an open checkout, the second outside and using the `-R
REPOSITORY` option to identify the repository. Both cases require that
the named user be present in the repository when the default user is
assigned. Although the default user is internally stored as if it were
a setting named `default-user`, it is not accessible through
the `fossil set` command.

Items 5, 6, and 7 cover most of the names of an environment variable
set automatically by the platform with the name of the platform's
logged in user for use by programs. Historically, `USER` comes from
Unix System-V, `LOGNAME` from BSD, and `USERNAME` from Windows, but
many Linux distributions will set both `USER` and `LOGNAME` for broad
compatibility.

When creating a new repository, fossil needs a user name for the admin
user granted the "s" permission. But since fossil generally expects
that `fossil new` or `fossil clone` are used outside of any checkout
(especially when run for the first time without any checkouts at all
or the users's global settings database), it looks in a shorter list
of places for a non-blank name. In the special case of a clone,
`default-user` can be copied from the original, and so it can be set
in the clone even before any users have been created, and in that case
it will be the new admin user. If `default-user` is not set, then the
first found environment variable from the list `FOSSIL_USER`, `USER`,
`LOGNAME`, and `USERNAME`, is the user name. As a final fallback, if
none of those are set, then the default user name is "root".


### Home Directory

Fossil keeps some information interesting to each user in the user's
home directory. This includes the global settings and the list of
repositories and checkouts used by `fossil all`.