tools: move update-undici.sh to dep_updaters and create brotli maintaining md

.github/workflows/tools.yml

@@ -69,12 +69,10 @@ jobs:
             subsystem: deps
             label: dependencies
             run: |
-              NEW_VERSION=$(npm view undici dist-tags.latest)
-              CURRENT_VERSION=$(node -p "require('./deps/undici/src/package.json').version")
-              if [ "$NEW_VERSION" != "$CURRENT_VERSION" ]; then
-                echo "NEW_VERSION=$NEW_VERSION" >> $GITHUB_ENV
-                ./tools/update-undici.sh
-              fi
+              ./tools/dep_updaters/update-undici.sh > temp-output
+              cat temp-output
+              tail -n1 temp-output | grep "NEW_VERSION=" >> "$GITHUB_ENV" || true
+              rm temp-output
           - id: postject
             subsystem: deps,test
             label: test

doc/contributing/maintaining-brotli.md

@@ -0,0 +1,25 @@
+# Maintaining brotli
+
+The [brotli](https://github.com/google/brotli) dependency is used for
+the homonym generic-purpose lossless compression algorithm.
+
+## Updating brotli
+
+The `tools/dep_updaters/update-brotli.sh` script automates the update of the
+brotli source files.
+
+Check that Node.js still builds and tests.
+
+## Committing brotli
+
+1. Add brotli:
+   ```console
+   $ git add deps/brotli
+   ```
+2. Commit the changes: `git commit`.
+3. Add a message like:
+   ```text
+   deps: update brotli to <version>
+
+   Updated as described in doc/contributing/maintaining-brotli.md.
+   ```

doc/contributing/maintaining-http.md

@@ -62,6 +62,8 @@ more control is required. The current plan is for the following APIs:
   Fetch-based API. As this gets worked out we will discuss which
   APIs to expose in the Node.js API surface.
 
+For info see [maintaining undici][].
+
 ### Server APIs
 
 For the server APIs we do not yet have a clear path, other than wanting
@@ -116,3 +118,4 @@ The low-level implementation of
 is based on [nghttp2](https://nghttp2.org/). See [maintaining nghttp2][].
 
 [maintaining nghttp2]: ./maintaining-nghttp2.md
+[maintaining undici]: ./maintaining-undici.md

doc/contributing/maintaining-postject.md

@@ -19,7 +19,6 @@ Check that Node.js still builds and tests.
    ```
 2. Commit the changes: `git commit`.
 3. Add a message like:
-
    ```text
    deps,test: update postject to <version>
 

doc/contributing/maintaining-undici.md

@@ -0,0 +1,25 @@
+# Maintaining undici
+
+The [undici](https://github.com/nodejs/undici) dependency is
+an HTTP/1.1 client, written from scratch for Node.js.
+
+## Updating undici
+
+The `tools/dep_updaters/update-undici.sh` script automates the update of the
+undici source files.
+
+Check that Node.js still builds and tests.
+
+## Committing undici
+
+1. Add undici:
+   ```console
+   $ git add deps/undici
+   ```
+2. Commit the changes: `git commit`.
+3. Add a message like:
+   ```text
+   deps: update undici to <version>
+
+   Updated as described in doc/contributing/maintaining-undici.md.
+   ```

tools/update-undici.sh → tools/dep_updaters/update-undici.sh

@@ -7,7 +7,22 @@
 
 set -ex
 
-cd "$( dirname "$0" )/.." || exit
+ROOT=$(cd "$(dirname "$0")/../.." && pwd)
+[ -z "$NODE" ] && NODE="$ROOT/out/Release/node"
+[ -x "$NODE" ] || NODE=$(command -v node)
+NPM="$ROOT/deps/npm/bin/npm-cli.js"
+
+NEW_VERSION=$("$NODE" "$NPM" view undici dist-tags.latest)
+CURRENT_VERSION=$("$NODE" -p "require('./deps/undici/src/package.json').version")
+
+echo "Comparing $NEW_VERSION with $CURRENT_VERSION"
+
+if [ "$NEW_VERSION" = "$CURRENT_VERSION" ]; then
+  echo "Skipped because Undici is on the latest version."
+  exit 0
+fi
+
+cd "$( dirname "$0" )/../.." || exit
 rm -rf deps/undici/src
 rm -f deps/undici/undici.js
 
@@ -16,25 +31,18 @@ rm -f deps/undici/undici.js
     mkdir undici-tmp
     cd undici-tmp || exit
 
-    ROOT="$PWD/.."
-    [ -z "$NODE" ] && NODE="$ROOT/out/Release/node"
-    [ -x "$NODE" ] || NODE=$(command -v node)
-    NPM="$ROOT/deps/npm/bin/npm-cli.js"
-
     "$NODE" "$NPM" init --yes
 
     "$NODE" "$NPM" install --global-style --no-bin-links --ignore-scripts undici
     cd node_modules/undici
     "$NODE" "$NPM" run build:node
-    # get the new version of undici
-    UNDICI_VERSION=$("$NODE" -p "require('./package.json').version")
     # update this version information in src/undici_version.h
     FILE_PATH="$ROOT/src/undici_version.h"
     echo "// This is an auto generated file, please do not edit." > "$FILE_PATH"
     echo "// Refer to tools/update-undici.sh" >> "$FILE_PATH"
     echo "#ifndef SRC_UNDICI_VERSION_H_" >> "$FILE_PATH"
     echo "#define SRC_UNDICI_VERSION_H_" >> "$FILE_PATH"
-    echo "#define UNDICI_VERSION \"$UNDICI_VERSION\"" >> "$FILE_PATH"
+    echo "#define UNDICI_VERSION \"$NEW_VERSION\"" >> "$FILE_PATH"
     echo "#endif  // SRC_UNDICI_VERSION_H_" >> "$FILE_PATH"
 )
 
@@ -43,3 +51,7 @@ mv deps/undici/src/undici-fetch.js deps/undici/undici.js
 cp deps/undici/src/LICENSE deps/undici/LICENSE
 
 rm -rf undici-tmp/
+
+# The last line of the script should always print the new version,
+# as we need to add it to $GITHUB_ENV variable.
+echo "NEW_VERSION=$NEW_VERSION"