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Docker run -e FOO should erase FOO if FOO isn't set in client env 

See #10141 for more info, but the main point of this is to make sure
that if you do "docker run -e FOO ..." that FOO from the current env
is passed into the container.  This means that if there's a value, its
set.  But it also means that if FOO isn't set then it should be unset in
the container too - even if it has to remove it from the env.  So,
   unset HOSTNAME
   docker run -e HOSTNAME busybox env
should _NOT_ show HOSTNAME in the list at all

Closes #10141

Signed-off-by: Doug Davis <dug@us.ibm.com>
This commit is contained in:
Doug Davis 2015-01-16 12:57:08 -08:00 committed by Tibor Vass
parent 3296ada2ed
commit 642218cefa
1 changed files with 6 additions and 3 deletions
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9
docs/sources/reference/commandline/cli.md
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@ -1736,9 +1736,12 @@ ports in Docker.
This sets environmental variables in the container. For illustration all three
flags are shown here. Where `-e`, `--env` take an environment variable and
value, or if no "=" is provided, then that variable's current value is passed
through (i.e. `$MYVAR1` from the host is set to `$MYVAR1` in the container). All
three flags, `-e`, `--env` and `--env-file` can be repeated.
value, or if no `=` is provided, then that variable's current value is passed
through (i.e. `$MYVAR1` from the host is set to `$MYVAR1` in the container).
When no `=` is provided and that variable is not defined in the client's
environment then that variable will be removed from the container's list of
environment variables.
All three flags, `-e`, `--env` and `--env-file` can be repeated.
Regardless of the order of these three flags, the `--env-file` are processed
first, and then `-e`, `--env` flags. This way, the `-e` or `--env` will