docker: correctly escape $BACKEND in the help output

qemu with hax to log dma reads & writes jcs.org/2018/11/12/vfio

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

Since 8a2390a4f47:

$ 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>

authored by

Philippe Mathieu-Daudé and committed by

Fam Zheng 8 years ago 6423795e c1958e9d

+1 -1

1 changed file

expand all

tests

docker

Makefile.include

+1 -1

tests/docker/Makefile.include

··· 109 109 @echo ' DEBUG=1 Stop and drop to shell in the created container' 110 110 @echo ' before running the command.' 111 111 @echo ' NETWORK=1 Enable virtual network interface with default backend.' 112 - @echo ' NETWORK=$BACKEND Enable virtual network interface with $BACKEND.' 112 + @echo ' NETWORK=$$BACKEND Enable virtual network interface with $$BACKEND.' 113 113 @echo ' NOUSER Define to disable adding current user to containers passwd.' 114 114 @echo ' NOCACHE=1 Ignore cache when build images.' 115 115 @echo ' EXECUTABLE=<path> Include executable in image.'