[Bug 3519] New: Command line parameter to print out full config

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3519

            Bug ID: 3519
           Summary: Command line parameter to print out full config
           Product: Portable OpenSSH
           Version: 9.1p1
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: sparr0 at gmail.com

~/.ssh/config can contain directives such as Include which result in a
configuration state that cannot be found in any single file. `ssh -G
[host]` will print out the fully processed config for a particular
host, but information such as host wildcards cannot be authoritatively
determined through this mechanism.

This enhancement request is for a command line parameter that will
print the entire configuration after it is loaded. Ideally in a format
that could be used as a standalone ~/.ssh/config, and with the contents
matching the layout of the original included config files, but some
other consistent and machine readable format would still be useful.

My use case involves some existing helper scripts that check for the
existence of some configuration in ~/.ssh/config. Those scripts cannot
see that configuration in my ~/.ssh/configX which is included in my
main config, but I also don't want them to search ~/.ssh/* because that
would cover files that aren't included or otherwise loaded. As I found
myself considering writing my own ssh config preprocessor based on
readconf.c I decided this request might be in order.

Example:
% cat ~/.ssh/config
Host foo
    HostName foo.foo.foo
Include configA
Include configB
% cat ~/.ssh/configA
Host bar
    HostName bar.bar.bar
% cat ~/.ssh/configB
Host foo
    User foouser
% ssh --print-config-ideal
Host foo
    HostName foo.foo.foo
Host bar
    HostName bar.bar.bar
Host foo
    User foouser
% ssh --print-config-acceptable
Host foo
    HostName foo.foo.foo
    User foouser
Host bar
    HostName bar.bar.bar

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