Add HOMEBREW_NO_DEV_CMD_MESSAGE

Library/Homebrew/brew.rb

@@ -93,7 +93,7 @@ begin
     internal_cmd ||= begin
       internal_dev_cmd = Commands.valid_internal_dev_cmd?(cmd)
       if internal_dev_cmd && !Homebrew::EnvConfig.developer?
-        if ENV["HOMEBREW_DEV_CMD_RUN"].blank? && ENV["HOMEBREW_TEST"].blank?
+        if ENV["HOMEBREW_DEV_CMD_RUN"].blank? && !Homebrew::EnvConfig.no_dev_cmd_message?
           opoo <<~MESSAGE
             #{Tty.bold}#{cmd}#{Tty.reset} is a developer command, so
             Homebrew's developer mode has been automatically turned on.

Library/Homebrew/brew.sh

@@ -645,7 +645,7 @@ elif [[ -f "${HOMEBREW_LIBRARY}/Homebrew/dev-cmd/${HOMEBREW_COMMAND}.sh" ]]
 then
   if [[ -z "${HOMEBREW_DEVELOPER}" ]]
   then
-    if [[ -z "${HOMEBREW_DEV_CMD_RUN}" ]] && [[ -z "${HOMEBREW_TEST}" ]]
+    if [[ -z "${HOMEBREW_DEV_CMD_RUN}" ]] && [[ -z "${HOMEBREW_NO_DEV_CMD_MESSAGE}" ]]
     then
       message="$(bold "${HOMEBREW_COMMAND}") is a developer command, so
 Homebrew's developer mode has been automatically turned on.

Library/Homebrew/dev-cmd/tests.rb

@@ -87,7 +87,7 @@ module Homebrew
         ENV.delete(env)
       end
 
-      ENV["HOMEBREW_TEST"] = "1"
+      ENV["HOMEBREW_NO_DEV_CMD_MESSAGE"] = "1"
       ENV["HOMEBREW_NO_ANALYTICS_THIS_RUN"] = "1"
       ENV["HOMEBREW_NO_COMPAT"] = "1" if args.no_compat?
       ENV["HOMEBREW_TEST_GENERIC_OS"] = "1" if args.generic?

Library/Homebrew/env_config.rb

@@ -235,6 +235,10 @@ module Homebrew
         description: "If set, disable all use of legacy compatibility code.",
         boolean:     true,
       },
+      HOMEBREW_NO_DEV_CMD_MESSAGE:            {
+        description: "If set, do not display a warning message when running a developer command for the first time.",
+        boolean:     true,
+      },
       HOMEBREW_NO_EMOJI:                      {
         description: "If set, do not print `HOMEBREW_INSTALL_BADGE` on a successful build." \
                      "\n\n    *Note:* Will only try to print emoji on OS X Lion or newer.",

docs/Manpage.md

@@ -2027,6 +2027,9 @@ example, run `export HOMEBREW_NO_INSECURE_REDIRECT=1` rather than just
 - `HOMEBREW_NO_COMPAT`
   <br>If set, disable all use of legacy compatibility code.
 
+- `HOMEBREW_NO_DEV_CMD_MESSAGE`
+  <br>If set, do not display a warning message when running a developer command for the first time.
+
 - `HOMEBREW_NO_EMOJI`
   <br>If set, do not print `HOMEBREW_INSTALL_BADGE` on a successful build.
 

manpages/brew.1

@@ -2923,6 +2923,12 @@ If set, do not print text with colour added\.
 If set, disable all use of legacy compatibility code\.
 .
 .TP
+\fBHOMEBREW_NO_DEV_CMD_MESSAGE\fR
+.
+.br
+If set, do not display a warning message when running a developer command for the first time\.
+.
+.TP
 \fBHOMEBREW_NO_EMOJI\fR
 .
 .br