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docker: correctly escape $BACKEND in the help output

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In Makefiles the $ must be escaped as $$ in shell uses.

Since 8a2390a4f4:

 $ make docker
     [...]
     NETWORK=1            Enable virtual network interface with default backend.
     NETWORK=ACKEND     Enable virtual network interface with ACKEND.

Once escaped:

 $ make docker
     [...]
     NETWORK=1            Enable virtual network interface with default backend.
     NETWORK=$BACKEND     Enable virtual network interface with $BACKEND.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-Id: <20171108024719.8389-1-f4bug@amsat.org>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Philippe Mathieu-Daudé 2017-11-07 23:47:19 -03:00 committed by Fam Zheng
parent c1958e9d54
commit 6423795efc
1 changed files with 1 additions and 1 deletions
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2
tests/docker/Makefile.include
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@ -109,7 +109,7 @@ docker:
@echo ' DEBUG=1 Stop and drop to shell in the created container'
@echo ' before running the command.'
@echo ' NETWORK=1 Enable virtual network interface with default backend.'
@echo ' NETWORK=$BACKEND Enable virtual network interface with $BACKEND.'
@echo ' NETWORK=$$BACKEND Enable virtual network interface with $$BACKEND.'
@echo ' NOUSER Define to disable adding current user to containers passwd.'
@echo ' NOCACHE=1 Ignore cache when build images.'
@echo ' EXECUTABLE=<path> Include executable in image.'