cmd/vendor-install.sh: allow download vendors from HOMEBREW_ARTIFACT_DOMAIN and HOMEBREW_BOTTLE_DOMAIN

Library/Homebrew/cmd/vendor-install.sh

@@ -34,8 +34,18 @@ fi
 # shellcheck disable=SC2034
 if [[ -n "${ruby_SHA}" && -n "${ruby_FILENAME}" ]]
 then
-  ruby_URL="https://ghcr.io/v2/homebrew/portable-ruby/portable-ruby/blobs/sha256:${ruby_SHA}"
+  ruby_URLs=()
-  ruby_URL2="https://github.com/Homebrew/homebrew-portable-ruby/releases/download/2.6.3_2/${ruby_FILENAME}"
+  if [[ -n "${HOMEBREW_ARTIFACT_DOMAIN}" ]]
+  then
+    ruby_URLs+=("${HOMEBREW_ARTIFACT_DOMAIN}/bottles-portable-ruby/${ruby_FILENAME}")
+  fi
+  if [[ -n "${HOMEBREW_BOTTLE_DOMAIN}" ]]
+  then
+    ruby_URLs+=("${HOMEBREW_BOTTLE_DOMAIN}/bottles-portable-ruby/${ruby_FILENAME}")
+  fi
+  ruby_URLs+=("https://ghcr.io/v2/homebrew/portable-ruby/portable-ruby/blobs/sha256:${ruby_SHA}"
+              "https://github.com/Homebrew/homebrew-portable-ruby/releases/download/2.6.3_2/${ruby_FILENAME}")
+  ruby_URL="${ruby_URLs[0]}"
 fi
 
 check_linux_glibc_version() {
@@ -76,7 +86,10 @@ quiet_stderr() {
 
 fetch() {
   local -a curl_args
+  local url
   local sha
+  local first_try=1
+  local vendor_locations
   local temporary_path
 
   curl_args=()
@@ -119,31 +132,34 @@ fetch() {
   then
     [[ -n "${HOMEBREW_QUIET}" ]] || echo "Already downloaded: ${CACHED_LOCATION}" >&2
   else
+    for url in "${VENDOR_URLs[@]}"
+    do
+      [[ -n "${HOMEBREW_QUIET}" || -n "${first_try}" ]] || ohai "Downloading ${url}" >&2
+      first_try=''
       if [[ -f "${temporary_path}" ]]
       then
         # HOMEBREW_CURL is set by brew.sh (and isn't mispelt here)
         # shellcheck disable=SC2153
-      "${HOMEBREW_CURL}" "${curl_args[@]}" -C - "${VENDOR_URL}" -o "${temporary_path}"
+        "${HOMEBREW_CURL}" "${curl_args[@]}" -C - "${url}" -o "${temporary_path}"
         if [[ $? -eq 33 ]]
         then
           [[ -n "${HOMEBREW_QUIET}" ]] || echo "Trying a full download" >&2
           rm -f "${temporary_path}"
-        "${HOMEBREW_CURL}" "${curl_args[@]}" "${VENDOR_URL}" -o "${temporary_path}"
+          "${HOMEBREW_CURL}" "${curl_args[@]}" "${url}" -o "${temporary_path}"
         fi
       else
-      "${HOMEBREW_CURL}" "${curl_args[@]}" "${VENDOR_URL}" -o "${temporary_path}"
+        "${HOMEBREW_CURL}" "${curl_args[@]}" "${url}" -o "${temporary_path}"
-    fi
-
-    if [[ ! -f "${temporary_path}" ]]
-    then
-      [[ -n "${HOMEBREW_QUIET}" ]] || ohai "Downloading ${VENDOR_URL2}" >&2
-      "${HOMEBREW_CURL}" "${curl_args[@]}" "${VENDOR_URL2}" -o "${temporary_path}"
       fi
 
+      [[ -f "${temporary_path}" ]] && break
+    done
+
     if [[ ! -f "${temporary_path}" ]]
     then
+      vendor_locations="$(printf "  - %s\n" "${VENDOR_URLs[@]}")"
       odie <<EOS
-Failed to download ${VENDOR_URL} and ${VENDOR_URL2}!
+Failed to download ${VENDOR_NAME} from the following locations:
+${vendor_locations}
 
 Do not file an issue on GitHub about this; you will need to figure out for
 yourself what issue with your internet connection restricts your access to
@@ -263,11 +279,9 @@ homebrew-vendor-install() {
   filename_var="${VENDOR_NAME}_FILENAME"
   sha_var="${VENDOR_NAME}_SHA"
   url_var="${VENDOR_NAME}_URL"
-  url2_var="${VENDOR_NAME}_URL2"
   VENDOR_FILENAME="${!filename_var}"
   VENDOR_SHA="${!sha_var}"
   VENDOR_URL="${!url_var}"
-  VENDOR_URL2="${!url2_var}"
   VENDOR_VERSION="$(<"${VENDOR_DIR}/portable-${VENDOR_NAME}-version")"
 
   if [[ -z "${VENDOR_URL}" || -z "${VENDOR_SHA}" ]]
@@ -275,6 +289,11 @@ homebrew-vendor-install() {
     odie "No Homebrew ${VENDOR_NAME} ${VENDOR_VERSION} available for ${HOMEBREW_PROCESSOR} processors!"
   fi
 
+  # Expand the name to an array of variables
+  # The array name must be "${VENDOR_NAME}_URLs"! Otherwise substitution errors will occur!
+  # shellcheck disable=SC2086
+  read -r -a VENDOR_URLs <<< "$(eval "echo "\$\{${url_var}s[@]\}"")"
+
   CACHED_LOCATION="${HOMEBREW_CACHE}/${VENDOR_FILENAME}"
 
   lock "vendor-install-${VENDOR_NAME}"