azure-cli: add generate-extensions routine

At nixpkgs, generate-extensions routine can be executed as:

  nix run .#azure-cli.passthru.generate-extensions

pkgs/by-name/az/azure-cli/README.md

@@ -19,13 +19,12 @@
 
 ## Extensions
 
-There are two sets of extensions: the one in `extensions-generated.nix` is generated with the script
-`query-extension-index.sh`. These are extensions that don't have external requirements and thus can
-be easily maintained and updated. The set should only be manipulated through an update based on the
-script output.
+There are two sets of extensions:
 
-The other set of extensions is in `extensions-manual.nix`. These are extensions with requirements,
-which need to be packaged and maintained manually.
+- `extensions-generated.nix` are extensions with no external requirements, which can be regenerated running:
+  > nix run .#azure-cli.passthru.generate-extensions
+
+- `extensions-manual.nix` are extensions with requirements, which need to be manually packaged and maintained.
 
 ### Adding an extension to `extensions-manual.nix`
 

pkgs/by-name/az/azure-cli/extensions-generated.nix

@@ -1,9 +1,4 @@
-# This file packages Azure CLI extensions that don't have any requirements.
-# Extensions with requirements should be placed in another file, so this one
-# can be re-generated during update.
-#
-# Attributes were generated using the query-extension-index.sh script:
-#   ./query-extension-index.sh --requirements=false --download --nix --cli-version=<version>
+# This file is automatically generated. DO NOT EDIT! Read README.md
 { mkAzExtension }:
 {
   account = mkAzExtension rec {

pkgs/by-name/az/azure-cli/package.nix

@@ -8,6 +8,7 @@
   runCommand,
   installShellFiles,
   python311,
+  writeScriptBin,
 
   # Whether to include patches that enable placing certain behavior-defining
   # configuration files in the Nix store.
@@ -375,6 +376,19 @@ py.pkgs.toPythonApplication (
             touch $out
           '';
       };
+
+      generate-extensions = writeScriptBin "${pname}-update-extensions" ''
+        export FILE=extensions-generated.nix
+        echo "# This file is automatically generated. DO NOT EDIT! Read README.md" > $FILE
+        echo "{ mkAzExtension }:" >> $FILE
+        echo "{" >> $FILE
+        ${./query-extension-index.sh} --requirements=false --download --nix --cli-version=${version} \
+          | xargs -n1 -d '\n' echo " " >> $FILE
+        echo "" >> $FILE
+        echo "}" >> $FILE
+        echo "Extension was saved to \"extensions-generated.nix\" file."
+        echo "Move it to \"{nixpkgs}/pkgs/by-name/az/azure-cli/extensions-generated.nix\"."
+      '';
     };
 
     meta = {