[Bug 2607] New: accept location off ssh binary via environment variable or deduce it from /proc/

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2607

            Bug ID: 2607
           Summary: accept location off ssh binary via environment
                    variable or deduce it from /proc/
           Product: Portable OpenSSH
           Version: 7.3p1
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: stefan.tomanek-mindrot at wertarbyte.de

Created attachment 2864
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2864&action=edit
use /proc/self/exe or environment variable to launch port forwarding
for ProxyJump

When testing the relatively new JumpHost (-J) functionality, ssh
constructed several command lines to facilitate the port forwarding;
the command line however always starts with "ssh", picking the wrong
binary from $PATH (and not from my development directory). This patch
adds the option to use an environment variable (SSH_CUSTOM_CMD) to
specify the command line to start with; on platforms that support it
(Linux), it can also use /proc/self/exe to identify the ssh binary
currently run and use it to create the port forwarding, avoiding
confusions and possible problems when using different versions of ssh.

github reference:
https://github.com/wertarbyte/openssh-portable/compare/master...proxyjump_custom_cmd

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