Review code and improve style

check

@@ -1,29 +1,30 @@
 #!/bin/bash
 
-set -e
+set -eo pipefail
 
 exec 3>&1 # make stdout available as fd 3 for the result
 exec 1>&2 # redirect all output to stderr for logging
 
-payload=$(mktemp "$TMPDIR/resource-check.XXXXXX")
-cat > "$payload" <&0
+payload=$(mktemp "${TMPDIR}/resource-check.XXXXXX")
+cat > "${payload}" <&0
 
-source_project=$(jq -r '.source.project // empty' < "$payload")
-if [[ "${source_project}X" == "X" ]]; then
-  >&2 echo "Source parameter 'project' is missing"
-  exit 1
+source_project=$(jq --raw-output '.source.project // empty' < "${payload}")
+if [[ -z "${source_project}" ]]; then
+    >&2 echo "Source parameter 'project' is missing"
+    exit 1
 fi
 
-curl -sf "https://releases.hashicorp.com/${source_project}/index.json" > /dev/null || (
-  >&2 echo "Unknown hashicorp project '$source_project'"
-  exit 1
+curl --silent --fail  --show-error --location --output /dev/null \
+        --url "https://releases.hashicorp.com/${source_project}/index.json" || (
+    >&2 echo "Unknown hashicorp project '${source_project}'"
+    exit 1
 )
 >&2 echo "Looking up versions of '${source_project}'"
-latest_version=$(curl -s "https://releases.hashicorp.com/${source_project}/index.json" \
-  | jq -r '.versions | keys[]' \
-  | grep -v "beta" | grep -v "rc" | grep -v "alpha" | grep -v "+" \
-  | sort -V | tail -n1)
+latest_version=$(curl --silent --fail --url "https://releases.hashicorp.com/${source_project}/index.json" \
+    | jq -r '.versions | keys[]' \
+    | grep -v "beta" | grep -v "rc" | grep -v "alpha" | grep -v "+" \
+    | sort -V | tail -n1)
 
->&2 echo "Latest version $latest_version"
+>&2 echo "Latest version ${latest_version}"
 
-jq -n --arg version "${latest_version}" '[{ version: $version }]' >&3
+jq --null-input --arg version "${latest_version}" '[ { version: $version } ]' >&3

in

@@ -1,53 +1,58 @@
 #!/bin/bash
 
-set -e
+set -eo pipefail
 
 exec 3>&1 # make stdout available as fd 3 for the result
 exec 1>&2 # redirect all output to stderr for logging
 
 destination=$1
 
-payload=$(mktemp "$TMPDIR/resource-check.XXXXXX")
-cat > "$payload" <&0
+payload=$(mktemp "${TMPDIR}/resource-check.XXXXXX")
+cat > "${payload}" <&0
 
-version=$(jq -r '.version.version // empty' < "$payload")
-if [[ "${version}X" == "X" ]]; then
-  >&2 echo "Version info 'version' is missing"
-  exit 1
+version=$(jq -r '.version.version // empty' < "${payload}")
+if [[ -z ${version} ]]; then
+    >&2 echo "Version info 'version' is missing"
+    exit 1
 fi
 
-source_project=$(jq -r '.source.project // empty' < "$payload")
-if [[ "${source_project}X" == "X" ]]; then
-  >&2 echo "Source parameter 'project' is missing"
-  exit 1
+source_project=$(jq -r '.source.project // empty' < "${payload}")
+if [[ -z ${source_project} ]]; then
+    >&2 echo "Source parameter 'project' is missing"
+    exit 1
 fi
 
-params_regexp=$(jq -r '.params.regexp // empty' < "$payload")
+params_regexp=$(jq -r '.params.regexp // empty' < "${payload}")
 
-curl -sf "https://releases.hashicorp.com/${source_project}/index.json" > /dev/null || (
-  >&2 echo "Unknown hashicorp project '$source_project'"
-  exit 1
+curl --silent --fail --show-error --location --output /dev/null \
+        --url "https://releases.hashicorp.com/${source_project}/index.json" || (
+    >&2 echo "Unknown hashicorp project '${source_project}'"
+    exit 1
 )
 
 >&2 echo "Fetching assets ${source_project} v${version}"
-cd "$destination"
-echo "$version" > version
-echo "$source_project" > project
-
-build_urls=$(curl -s "https://releases.hashicorp.com/${source_project}/index.json" | jq -r ".versions[\"${version}\"].builds[].url")
-if [[ ! -z $params_regexp ]]; then
-  set +e
-  build_urls=$(echo "${build_urls}" | grep "${params_regexp}")
-  set -e
+cd "${destination}"
+echo "${version}" > version
+echo "${source_project}" > project
+
+build_urls=$(
+    curl --silent --fail --show-error --location \
+            --url "https://releases.hashicorp.com/${source_project}/index.json" \
+        | jq -r ".versions[\"${version}\"].builds[].url"
+)
+if [[ -n "${params_regexp}" ]]; then
+    set +e
+    build_urls=$(grep "${params_regexp}" <<< "${build_urls}")
+    set -e
 fi
-if [[ ! -z $build_urls ]]; then
-  for url in $build_urls; do
-    >&2 echo "Downloading $url"
-    curl -O "$url"
-  done
-else
-  >&2 echo "regexp '$params_regexp' did not match any build URLs"
-  exit 1
+if [[ -z "${build_urls}" ]]; then
+    >&2 echo "Regexp '${params_regexp}' did not match any build URLs"
+    exit 1
 fi
+for url in ${build_urls}; do
+    >&2 echo "Downloading ${url}"
+    curl --silent --fail --show-error --location --remote-name \
+        --url "${url}"
+done
 
-jq -n --arg version "${version}" '{version: { version: $version }}' >&3
+jq --null-input --arg version "${version}" '{ version: { version: $version } }' >&3