Fix various linter issues

Found via shellcheck.

backend/build.sh

@@ -11,8 +11,8 @@ SCOPE_SRC=$GOPATH/src/github.com/weaveworks/scope
 # will have awkward ownership.  So we switch to a user with the
 # same user and group IDs as source directory.  We have to set a
 # few things up so that sudo works without complaining later on.
-uid=$(stat --format="%u" $SCOPE_SRC)
-gid=$(stat --format="%g" $SCOPE_SRC)
+uid=$(stat --format="%u" "$SCOPE_SRC")
+gid=$(stat --format="%g" "$SCOPE_SRC")
 echo "weave:x:$uid:$gid::$SCOPE_SRC:/bin/sh" >>/etc/passwd
 echo "weave:*:::::::" >>/etc/shadow
 echo "weave	ALL=(ALL)	NOPASSWD: ALL" >>/etc/sudoers

bin/release

@@ -8,15 +8,12 @@ DOCKERHUB_USER=${DOCKERHUB_USER:-weaveworks}
 RELEASE_NAME=${RELEASE_NAME:-"Weave Scope"}
 RELEASE_DESCRIPTION=${RELEASE_DESCRIPTION:-"Container Visibility"}
 
-PWD=`pwd`
-WC="wc"
-# Use GNU wc on Darwin
-case $OSTYPE in darwin*) WC="gwc" ;; esac
+PWD=$(pwd)
 
 infer_release_type() {
-    if echo $1 | grep -qE '^v[0-9]+\.[0-9]+\.0+$' ; then
+    if echo "$1" | grep -qE '^v[0-9]+\.[0-9]+\.0+$' ; then
         echo MAINLINE
-    elif echo $1 | grep -qE '^v[0-9]+\.[0-9]+\.[0-9]+$' ; then
+    elif echo "$1" | grep -qE '^v[0-9]+\.[0-9]+\.[0-9]+$' ; then
         echo BRANCH
     else
         echo PRERELEASE
@@ -26,10 +23,12 @@ infer_release_type() {
 setup() {
     # Ensure we have exactly one annotated tag pointing at HEAD
     HEAD_TAGS=$(git tag --points-at HEAD)
-	TAG_COUNT=$(echo $(echo $HEAD_TAGS | wc -w)) # mac hack
+    # shellcheck disable=SC2116
+    # shellcheck disable=SC2005
+    TAG_COUNT=$(echo "$(echo "$HEAD_TAGS" | wc -w)") # mac hack
     case $TAG_COUNT in
         1)
-            if [ $HEAD_TAGS != "latest_release" ] ; then
+            if [ "$HEAD_TAGS" != "latest_release" ] ; then
                 LATEST_TAG=$HEAD_TAGS
             else
                 echo "Cannot determine version - latest_release points at HEAD" >&2
@@ -49,11 +48,11 @@ setup() {
             ;;
     esac
 
-    RELEASE_TYPE=$(infer_release_type $LATEST_TAG)
+    RELEASE_TYPE=$(infer_release_type "$LATEST_TAG")
     echo "== Inferred release type $RELEASE_TYPE from tag $LATEST_TAG"
 
-    LATEST_TAG_SHA=$(git rev-parse $LATEST_TAG)
-    LATEST_TAG_COMMIT_SHA=$(git rev-list -1 $LATEST_TAG)
+    LATEST_TAG_SHA=$(git rev-parse "$LATEST_TAG")
+    LATEST_TAG_COMMIT_SHA=$(git rev-list -1 "$LATEST_TAG")
     LATEST_RELEASE_SHA=$(git rev-parse latest_release)
     LATEST_RELEASE_COMMIT_SHA=$(git rev-list -1 latest_release)
     if [ "$RELEASE_TYPE" != 'PRERELEASE' ] ; then
@@ -69,20 +68,20 @@ build() {
     setup
 
     echo "== Clone repo at $LATEST_TAG for version $VERSION"
-    if [ -d $RELEASE_DIR ]; then
+    if [ -d "$RELEASE_DIR" ]; then
         echo -e "\u2757 Release directory $RELEASE_DIR already exists, you may want to" >&2
         echo -e "\trm -rf $RELEASE_DIR" >&2
         exit 1
     fi
 
     ## Clone the repo at the tag and go there
     mkdir -p releases
-    git clone -q -b $LATEST_TAG . $RELEASE_DIR 2>/dev/null
-    cd $RELEASE_DIR
+    git clone -q -b "$LATEST_TAG" . "$RELEASE_DIR" 2>/dev/null
+    cd "$RELEASE_DIR"
 
     ## Check that the top changelog entry is this version
     if ! latest_changelog=$(perl -nle'print $& if m{(?<=^## Release ).*}' ./CHANGELOG.md | head -1) || \
-       ! [ `echo "$latest_changelog" = "$VERSION"` ]; then
+       ! [ "$latest_changelog" = "$VERSION" ]; then
         echo -e "\u2757 Latest changelog entry \"$latest_changelog\" does not match the release version $VERSION" >&2
         exit 1
     fi
@@ -93,9 +92,9 @@ build() {
     ## Inject the version numbers and build the distributables
     ## (library versions?)
     sed -i.tmp "s/SCRIPT_VERSION=\"[^\"]*\"/SCRIPT_VERSION=\"$VERSION\"/" ./scope
-    make SUDO=$SUDO SCOPE_VERSION=$VERSION DOCKERHUB_USER=$DOCKERHUB_USER
+    make SUDO="$SUDO" SCOPE_VERSION="$VERSION" DOCKERHUB_USER="$DOCKERHUB_USER"
 
-    if make tests SUDO=$SUDO; then
+    if make tests SUDO="$SUDO"; then
         echo -e '\u2713 Tests pass'
     else
         echo -e "\u2757 Tests failed, probably best not publish this one" >&2
@@ -110,18 +109,18 @@ build() {
     #fi
 
     echo -e '\u2713 Build OK'
-    echo '** Release artefacts in' $RELEASE_DIR
+    echo '** Release artefacts in' "$RELEASE_DIR"
 }
 
 draft() {
     setup
 
-    cd $PWD/$RELEASE_DIR
+    cd "$PWD"/"$RELEASE_DIR"
 
     echo "== Sanity checks"
 
     ## Check that the tag exists by looking at github
-    if ! curl -sSf https://api.github.com/repos/$GITHUB_USER/scope/git/tags/$LATEST_TAG_SHA >/dev/null 2>&1; then
+    if ! curl -sSf "https://api.github.com/repos/$GITHUB_USER/scope/git/tags/$LATEST_TAG_SHA" >/dev/null 2>&1; then
         echo -e "\u2757 Tag $LATEST_TAG is not on GitHub, or is not the same as the local tag" >&2
         echo -e "\thttps://github.com/$GITHUB_USER/scope/tags" >&2
         echo "You may need to" >&2
@@ -133,31 +132,31 @@ draft() {
 
     ## Check that the version does not already exist by looking at github
     ## releases
-    if github-release info --user $GITHUB_USER --repo scope --tag $LATEST_TAG >/dev/null 2>&1; then
+    if github-release info --user "$GITHUB_USER" --repo scope --tag "$LATEST_TAG" >/dev/null 2>&1; then
         echo -e "\u2757 Release $LATEST_TAG already exists on GitHub" >&2
         echo -e "\thttps://github.com/$GITHUB_USER/scope/releases/$LATEST_TAG" >&2
         exit 1
     fi
 
-    echo '** Sanity checks OK for publishing tag' $LATEST_TAG as $DOCKERHUB_USER/scope:$VERSION
+    echo '** Sanity checks OK for publishing tag' "$LATEST_TAG" as "$DOCKERHUB_USER/scope:$VERSION"
 
     RELEASE_ARGS="--draft"
     if [ "$RELEASE_TYPE" = 'PRERELEASE' ] ; then
         RELEASE_ARGS="$RELEASE_ARGS --pre-release"
     fi
 
     echo "== Creating GitHub release $RELEASE_ARGS $RELEASE_NAME $VERSION"
-    github-release release $RELEASE_ARGS \
-        --user $GITHUB_USER \
+    github-release release "$RELEASE_ARGS" \
+        --user "$GITHUB_USER" \
         --repo scope \
-        --tag $LATEST_TAG \
+        --tag "$LATEST_TAG" \
         --name "$RELEASE_NAME $VERSION" \
         --description "$RELEASE_DESCRIPTION"
 
     github-release upload \
-        --user $GITHUB_USER \
+        --user "$GITHUB_USER" \
         --repo scope \
-        --tag $LATEST_TAG \
+        --tag "$LATEST_TAG" \
         --name "scope" \
         --file "./scope"
 
@@ -167,25 +166,20 @@ draft() {
 
 publish() {
     setup
-    cd $PWD/$RELEASE_DIR
-
-    UPDATE_LATEST=false
-    if [ "$RELEASE_TYPE" = 'MAINLINE' ] ; then
-        UPDATE_LATEST=true
-    fi
+    cd "$PWD"/"$RELEASE_DIR"
 
     if [ "$RELEASE_TYPE" = 'PRERELEASE' ] ; then
         echo "== Tagging and pushing images on docker hub as user $DOCKERHUB_USER"
-        $SUDO docker tag -f $DOCKERHUB_USER/scope $DOCKERHUB_USER/scope:$VERSION
-        $SUDO docker push   $DOCKERHUB_USER/scope:$VERSION
+        $SUDO docker tag -f "$DOCKERHUB_USER"/scope "$DOCKERHUB_USER/scope:$VERSION"
+        $SUDO docker push   "$DOCKERHUB_USER/scope:$VERSION"
         echo "** Docker images tagged and pushed"
 
         echo "== Publishing pre-release on GitHub"
 
         github-release publish \
-            --user $GITHUB_USER \
+            --user "$GITHUB_USER" \
             --repo scope \
-            --tag $LATEST_TAG
+            --tag "$LATEST_TAG"
 
         echo "** Pre-release $RELEASE_NAME $VERSION published at"
         echo -e "\thttps://github.com/$GITHUB_USER/scope/releases/$LATEST_TAG"
@@ -199,44 +193,44 @@ publish() {
         fi
 
         ## Check that the 'latest_release' tag exists by looking at github
-        if ! curl -sSf https://api.github.com/repos/$GITHUB_USER/scope/git/tags/$LATEST_RELEASE_SHA >/dev/null 2>&1; then
+        if ! curl -sSf "https://api.github.com/repos/$GITHUB_USER/scope/git/tags/$LATEST_RELEASE_SHA" >/dev/null 2>&1; then
             echo -e "\u2757 Tag latest_release is not on GitHub, or is not the same as the local tag" >&2
             echo -e "\thttps://github.com/$GITHUB_USER/scope/tags" >&2
             echo "You may need to" >&2
             echo -e "\tgit push -f [email protected]:$GITHUB_USER/scope latest_release" >&2
             exit 1
         fi
-        echo '** Sanity checks OK for publishing tag' $LATEST_TAG as $DOCKERHUB_USER/scope:$VERSION
+        echo '** Sanity checks OK for publishing tag' "$LATEST_TAG" as "$DOCKERHUB_USER/scope:$VERSION"
 
         echo "== Tagging and pushing images on docker hub as user $DOCKERHUB_USER"
-        $SUDO docker tag -f $DOCKERHUB_USER/scope $DOCKERHUB_USER/scope:$VERSION
-        $SUDO docker push   $DOCKERHUB_USER/scope:$VERSION
+        $SUDO docker tag -f "$DOCKERHUB_USER"/scope "$DOCKERHUB_USER/scope:$VERSION"
+        $SUDO docker push   "$DOCKERHUB_USER"/scope:$"VERSION"
         echo "** Docker images tagged and pushed"
 
         echo "== Publishing release on GitHub"
 
         github-release publish \
-            --user $GITHUB_USER \
+            --user "$GITHUB_USER" \
             --repo scope \
-            --tag $LATEST_TAG
+            --tag "$LATEST_TAG"
 
-        if github-release info --user $GITHUB_USER --repo scope \
+        if github-release info --user "$GITHUB_USER" --repo scope \
             --tag latest_release >/dev/null 2>&1; then
             github-release delete \
-                --user $GITHUB_USER \
+                --user "$GITHUB_USER" \
                 --repo scope \
                 --tag latest_release
         fi
 
         github-release release \
-            --user $GITHUB_USER \
+            --user "$GITHUB_USER" \
             --repo scope \
             --tag latest_release \
             --name "$RELEASE_NAME latest ($VERSION)" \
             --description "[Release Notes](https://github.com/$GITHUB_USER/scope/releases/$LATEST_TAG)"
 
         github-release upload \
-            --user $GITHUB_USER \
+            --user "$GITHUB_USER" \
             --repo scope \
             --tag latest_release \
             --name "scope" \

bin/setup-circleci-secrets

@@ -8,7 +8,7 @@ set -eu
 openssl base64 -d << EOF \
   | openssl enc \
     -out bin/do-setup-circleci-secrets \
-		-d -aes256 -pass pass:$1
+		-d -aes256 -pass pass:"$1"
 U2FsdGVkX193YHZJXNzxU9GqigQaXWrA0AKd+BIjRcx7bmmKn/zSgOv+FfApRRjn
 KGBd2ulZw9CwsftX0HWHzVdtpgqbJUW+FEma8eNldau4/f+T+yWTVpCNQXGc3DvB
 cWYhmkoTfGWmI2v/0/Bv2TYkw7MAfjCocdluFAv7sSvYnSgIjoYxD4XXkTjLWy1P

client/test/run-jankie.sh

@@ -37,4 +37,4 @@ echo "Testing $COMMIT on $DATE"
 # ../../scope launch
 # sleep 5
 
-COMMIT="$COMMIT" DATE=$DATE HOST=$HOST DEBUG=scope* node ./perfjankie/main.js
+COMMIT="$COMMIT" DATE=$DATE HOST=$HOST DEBUG="scope*" node ./perfjankie/main.js

docker/entrypoint.sh

@@ -2,7 +2,7 @@
 
 mkdir -p /var/run/weave
 
-for arg in $@; do
+for arg in "$@"; do
     case "$arg" in
         --no-app|--probe-only|--service-token*|--probe.token*)
             touch /etc/service/app/down
@@ -13,9 +13,11 @@ for arg in $@; do
     esac
 done
 
+# shellcheck disable=SC2034
 ARGS=("$@")
 
 typeset -p ARGS >/var/run/weave/scope-app.args
+# shellcheck disable=SC2034
 typeset -p ARGS >/var/run/weave/scope-probe.args
 
 exec /home/weave/runsvinit

docker/run-app

@@ -1,5 +1,6 @@
 #!/bin/bash
 
+# shellcheck disable=SC1091
 source /var/run/weave/scope-app.args
 
 exec -a scope-app /home/weave/scope --mode app "${ARGS[@]}"

docker/run-probe

@@ -1,5 +1,6 @@
 #!/bin/bash
 
+# shellcheck disable=SC1091
 source /var/run/weave/scope-probe.args
 
 exec -a scope-probe /home/weave/scope --mode probe "${ARGS[@]}"

extras/build_on_circle.sh

@@ -2,4 +2,4 @@
 
 set -e
 
-./in_parallel.sh "make RM=" $(find . -maxdepth 2 -name *.go -printf "%h\n" | sort -u | sed -n 's/\.\/\(.*\)/\1\/\1/p')
+./in_parallel.sh "make RM=" "$(find . -maxdepth 2 -name "./*.go" -printf "%h\n" | sort -u | sed -n 's/\.\/\(.*\)/\1\/\1/p')"

extras/dialer/dialer

@@ -9,6 +9,7 @@ readonly addr=$1
 readonly max_dialer=${2:-50}
 
 dialer=()
+# shellcheck disable=SC2154
 trap 'echo -n "stopping ... "; for c in "${dialer[@]}"; do docker rm -f "$c" >/dev/null; done; echo "done"' EXIT
 
 while true; do

extras/example/run.sh

@@ -4,11 +4,11 @@ set -ex
 
 readonly ARG="$1"
 
-if ! $(weave status 1>/dev/null 2>&1); then
+if ! weave status 1>/dev/null 2>&1; then
     WEAVE_NO_PLUGIN=y weave launch
 fi
 
-eval $(weave env)
+eval "$(weave env)"
 
 start_container() {
     local IMAGE=$2
@@ -17,12 +17,12 @@ start_container() {
     shift 3
     local HOSTNAME=$BASENAME.weave.local
 
-    for i in $(seq $REPLICAS); do
-        if docker inspect $BASENAME$i >/dev/null 2>&1; then
-            docker rm -f $BASENAME$i
+    for i in $(seq "$REPLICAS"); do
+        if docker inspect "$BASENAME""$i" >/dev/null 2>&1; then
+            docker rm -f "$BASENAME""$i"
         fi
         if [ "$ARG" != "-rm" ]; then
-            docker run -d --name=$BASENAME$i --hostname=$HOSTNAME $@ $IMAGE
+            docker run -d --name="$BASENAME""$i" --hostname="$HOSTNAME" "$@" "$IMAGE"
         fi
     done
 }
@@ -33,6 +33,6 @@ start_container 1 redis redis
 start_container 1 tomwilkie/qotd qotd
 start_container 1 tomwilkie/echo echo
 start_container 2 tomwilkie/app app
-start_container 2 tomwilkie/frontend frontend --add-host=dns.weave.local:$(weave docker-bridge-ip)
+start_container 2 tomwilkie/frontend frontend --add-host=dns.weave.local:"$(weave docker-bridge-ip)"
 start_container 1 tomwilkie/client client
 

extras/example/run_tracer.sh

@@ -4,11 +4,11 @@ set -ex
 
 readonly ARG="$1"
 
-if ! $(weave status 1>/dev/null 2>&1); then
+if ! weave status 1>/dev/null 2>&1; then
     WEAVE_NO_PLUGIN=y weave launch
 fi
 
-eval $(weave env)
+eval "$(weave env)"
 
 start_container() {
     local replicas=$1
@@ -30,14 +30,14 @@ start_container() {
             ;;
         esac
     done
-    local container_args="$@"
+    local container_args="$*"
 
-    for i in $(seq ${replicas}); do
-        if docker inspect ${basename}${i} >/dev/null 2>&1; then
-            docker rm -f ${basename}${i}
+    for i in $(seq "${replicas}"); do
+        if docker inspect "${basename}""${i}" >/dev/null 2>&1; then
+            docker rm -f "${basename}""${i}"
         fi
-        docker run -d -e CHECKPOINT_DISABLE --name=${basename}${i} --hostname=${hostname} \
-            ${docker_args} ${image} ${container_args}
+        docker run -d -e CHECKPOINT_DISABLE --name="${basename}""${i}" --hostname="${hostname}" \
+            "${docker_args}" "${image}" "${container_args}"
     done
 }