Environment variables with an equals sign are not available in linked containers #12763
Description
I'm trying to access an environment variable containing an equals sign in a linked container.
Example:
$ docker run -i -t --rm --name foo -e "FOO=BAR" -e "BAZ=QUX=QUUX" ubuntu /bin/bash
root@073ecccb5a67:/# echo $FOO
BAR
root@073ecccb5a67:/# echo $BAZ
QUX=QUUX
Here is the result when I create a linked container in a separate terminal:
$ docker run -i -t --link foo:foo ubuntu /bin/bash
root@6f8edb5fbf66:/# echo $FOO_ENV_FOO
BAR
root@6f8edb5fbf66:/# echo $FOO_ENV_BAZ
root@6f8edb5fbf66:/#
Am I missing some special handling for the equals sign?
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