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properly deal with unavailable docker server api version

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Fixes #1845.
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Matthias Radestock committed 2015-12-31 12:51:16 +00:00
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commit c8ff2de3b3
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@@ -165,7 +165,7 @@ check_docker_server_api_version() {
# Cope with various versions of `docker version` output format
if ! DOCKER_API_VERSION=$(docker version -f '{{.Server.APIVersion}}' 2> /dev/null ) ; then
if ! DOCKER_API_VERSION=$(docker version -f '{{.Server.ApiVersion}}' 2> /dev/null ) ; then
if ! DOCKER_API_VERSION=$(docker version | sed -n -e 's|^Server API version: *\([0-9][0-9]*\.[0-9][0-9]\).*|\1|p') ; then
if ! DOCKER_API_VERSION=$(docker version | sed -n -e 's|^Server API version: *\([0-9][0-9]*\.[0-9][0-9]\).*|\1|p') || [ -z "$DOCKER_API_VERSION" ] ; then
echo "ERROR: Unable to determine docker version" >&2
exit 1
fi