fix shellcheck lints

images/bootstrap/create_bazel_cache_rcs.sh

@@ -18,35 +18,41 @@ CACHE_PORT="8080"
 
 # get the installed version of a debian package
 package_to_version () {
-    dpkg-query --showformat='${Version}' --show $1
+    dpkg-query --showformat='${Version}' --show "$1"
 }
 
 # look up a binary with which and return the debian package it belongs to
 command_to_package () {
-    local binary_path=$(readlink -f $(which $1))
+    local binary_path
+    binary_path=$(readlink -f "$(which "$1")")
     # `dpkg -S $package` spits out lines with the format: "package: file"
-    dpkg -S $1 | grep "${binary_path}" | cut -d':' -f1
+    dpkg -S "$1" | grep "${binary_path}" | cut -d':' -f1
 }
 
 # get the installed package version relating to a binary
 command_to_version () {
-    local package=$(command_to_package $1)
+    local package
+    package=$(command_to_package "$1")
     package_to_version "${package}"
 }
 
 hash_toolchains () {
     # if $CC is set bazel will use this to detect c/c++ toolchains, otherwise gcc
     # https://blog.bazel.build/2016/03/31/autoconfiguration.html
     local cc="${CC:-gcc}"
-    local cc_version=$(command_to_version $cc)
+    local cc_version
+    cc_version=$(command_to_version "$cc")
     # NOTE: IIRC some rules call python internally, this can't hurt
-    local python_version=$(command_to_version python)
+    local python_version
+    python_version=$(command_to_version python)
     # the rpm packaging rules use rpmbuild
-    local rpmbuild_version=$(command_to_version rpmbuild)
+    local rpmbuild_version
+    rpmbuild_version=$(command_to_version rpmbuild)
     # combine all tool versions into a hash
     # NOTE(bentheelder): if we change the set of tools considered we should
     # consider prepending the hash with a """schema version""" for completeness
-    local tool_versions="CC:${cc_version},PY:${python_version},RPM:${rpmbuild_version}"
+    local tool_versions
+    tool_versions="CC:${cc_version},PY:${python_version},RPM:${rpmbuild_version}"
     echo "${tool_versions}" | md5sum | cut -d" " -f1
 }
 
@@ -55,7 +61,7 @@ get_workspace () {
     if [[ -n "${REPO_NAME}" ]] && [[ -n "${REPO_OWNER}" ]]; then
         echo "${REPO_OWNER}/${REPO_NAME}"
     else
-        echo "$(basename $(dirname $PWD))/$(basename $PWD)"
+        echo "$(basename "$(dirname "$PWD")")/$(basename "$PWD")"
     fi
 }
 
@@ -70,8 +76,10 @@ make_bazel_rc () {
     # point bazel at our http cache ...
     # NOTE our caches are versioned by all path segments up until the last two
     # IE PUT /foo/bar/baz/cas/asdf -> is in cache "/foo/bar/baz"
-    local cache_id="$(get_workspace),$(hash_toolchains)"
-    local cache_url="http://${CACHE_HOST}:${CACHE_PORT}/${cache_id}"
+    local cache_id
+    cache_id="$(get_workspace),$(hash_toolchains)"
+    local cache_url
+    cache_url="http://${CACHE_HOST}:${CACHE_PORT}/${cache_id}"
     echo "build --remote_http_cache=${cache_url}"
     # specifically for bazel 0.15.0 we want to set this flag
     # our docker image now sets BAZEL_VERSION with the bazel version as installed