Add function to handle library installation from ci.json

.github/scripts/sketch_utils.sh

@@ -244,6 +244,14 @@ function build_sketch { # build_sketch <ide_path> <user_path> <path-to-ino> [ext
         fi
     fi
 
+    # Install libraries from ci.json if they exist
+    install_libs -ai "$ide_path" -s "$sketchdir"
+    install_result=$?
+    if [ $install_result -ne 0 ]; then
+        echo "ERROR: Library installation failed for $sketchname" >&2
+        exit $install_result
+    fi
+
     ARDUINO_CACHE_DIR="$HOME/.arduino/cache.tmp"
     if [ -n "$ARDUINO_BUILD_DIR" ]; then
         build_dir="$ARDUINO_BUILD_DIR"
@@ -580,13 +588,168 @@ function build_sketches { # build_sketches <ide_path> <user_path> <target> <path
     return 0
 }
 
+# Return 0 if the string looks like a git URL we should pass to --git-url
+is_git_like_url() {
+    local u=$1
+    [[ "$u" =~ ^https?://.+ ]] || [[ "$u" =~ ^git@[^:]+:.+ ]]
+}
+
+# If status!=0, print errors/warnings from captured output (fallback to full output)
+print_err_warnings() {
+    local status=$1; shift
+    local out=$*
+    if [ "$status" -ne 0 ]; then
+        printf '%s\n' "$out" | grep -Ei "error|warning|warn" >&2 || printf '%s\n' "$out" >&2
+    fi
+}
+
+function install_libs { # install_libs <ide_path> <sketchdir> [-v]
+    local ide_path=""
+    local sketchdir=""
+    local verbose=false
+
+    while [ -n "$1" ]; do
+        case "$1" in
+        -ai ) shift; ide_path=$1 ;;
+        -s  ) shift; sketchdir=$1 ;;
+        -v  ) verbose=true ;;
+        * )
+            echo "ERROR: Unknown argument: $1" >&2
+            echo "USAGE: install_libs -ai <ide_path> -s <sketchdir> [-v]" >&2
+            return 1
+            ;;
+        esac
+        shift
+    done
+
+    if [ -z "$ide_path" ]; then
+        echo "ERROR: IDE path not provided" >&2
+        echo "USAGE: install_libs -ai <ide_path> -s <sketchdir> [-v]" >&2
+        return 1
+    fi
+    if [ -z "$sketchdir" ]; then
+        echo "ERROR: Sketch directory not provided" >&2
+        echo "USAGE: install_libs -ai <ide_path> -s <sketchdir> [-v]" >&2
+        return 1
+    fi
+    if [ ! -f "$ide_path/arduino-cli" ]; then
+        echo "ERROR: arduino-cli not found at $ide_path/arduino-cli" >&2
+        return 1
+    fi
+
+    if [ ! -f "$sketchdir/ci.json" ]; then
+        [ "$verbose" = true ] && echo "No ci.json found in $sketchdir, skipping library installation"
+        return 0
+    fi
+    if ! jq -e . "$sketchdir/ci.json" >/dev/null 2>&1; then
+        echo "ERROR: $sketchdir/ci.json is not valid JSON" >&2
+        return 1
+    fi
+
+    local libs_type
+    libs_type=$(jq -r '.libs | type' "$sketchdir/ci.json" 2>/dev/null)
+    if [ -z "$libs_type" ] || [ "$libs_type" = "null" ]; then
+        [ "$verbose" = true ] && echo "No libs field found in ci.json, skipping library installation"
+        return 0
+    elif [ "$libs_type" != "array" ]; then
+        echo "ERROR: libs field in ci.json must be an array, found: $libs_type" >&2
+        return 1
+    fi
+
+    local libs_count
+    libs_count=$(jq -r '.libs | length' "$sketchdir/ci.json" 2>/dev/null)
+    if [ "$libs_count" -eq 0 ]; then
+        [ "$verbose" = true ] && echo "libs array is empty in ci.json, skipping library installation"
+        return 0
+    fi
+
+    echo "Installing $libs_count libraries from $sketchdir/ci.json"
+
+    local needs_unsafe=false
+    local original_unsafe_setting=""
+    local libs
+    libs=$(jq -r '.libs[]? // empty' "$sketchdir/ci.json")
+
+    # Detect any git-like URL (GitHub/GitLab/Bitbucket/self-hosted/ssh)
+    for lib in $libs; do
+        if is_git_like_url "$lib"; then
+            needs_unsafe=true
+            break
+        fi
+    done
+
+    if [ "$needs_unsafe" = true ]; then
+        [ "$verbose" = true ] && echo "Checking current unsafe install setting..."
+        original_unsafe_setting=$("$ide_path/arduino-cli" config get library.enable_unsafe_install 2>/dev/null || echo "false")
+        if [ "$original_unsafe_setting" = "false" ]; then
+            [ "$verbose" = true ] && echo "Enabling unsafe installs for Git URLs..."
+            "$ide_path/arduino-cli" config set library.enable_unsafe_install true >/dev/null 2>&1 || \
+                echo "WARNING: Failed to enable unsafe installs, Git URL installs may fail" >&2
+        else
+            [ "$verbose" = true ] && echo "Unsafe installs already enabled"
+        fi
+    fi
+
+    local rc=0 install_status=0 output=""
+    for lib in $libs; do
+        [ "$verbose" = true ] && echo "Processing library: $lib"
+
+        if is_git_like_url "$lib"; then
+            [ "$verbose" = true ] && echo "Installing library from git URL: $lib"
+            if [ "$verbose" = true ]; then
+                "$ide_path/arduino-cli" lib install --git-url "$lib"
+                install_status=$?
+            else
+                output=$("$ide_path/arduino-cli" lib install --git-url "$lib" 2>&1)
+                install_status=$?
+            fi
+        else
+            [ "$verbose" = true ] && echo "Installing library by name: $lib"
+            if [ "$verbose" = true ]; then
+                "$ide_path/arduino-cli" lib install "$lib"
+                install_status=$?
+            else
+                output=$("$ide_path/arduino-cli" lib install "$lib" 2>&1)
+                install_status=$?
+            fi
+        fi
+
+        # Treat "already installed"/"up to date" as success (idempotent)
+        if [ $install_status -ne 0 ] && echo "$output" | grep -qiE 'already installed|up to date'; then
+            install_status=0
+        fi
+
+        if [ "$verbose" != true ]; then
+            print_err_warnings "$install_status" "$output"
+        fi
+
+        if [ $install_status -ne 0 ]; then
+            echo "ERROR: Failed to install library: $lib" >&2
+            rc=$install_status
+            break
+        else
+            [ "$verbose" = true ] && echo "Successfully installed library: $lib"
+        fi
+    done
+
+    if [ "$needs_unsafe" = true ] && [ "$original_unsafe_setting" = "false" ]; then
+        [ "$verbose" = true ] && echo "Restoring original unsafe install setting..."
+        "$ide_path/arduino-cli" config set library.enable_unsafe_install false >/dev/null 2>&1 || true
+    fi
+
+    [ $rc -eq 0 ] && echo "Library installation completed"
+    return $rc
+}
+
+
 USAGE="
 USAGE: ${0} [command] [options]
 Available commands:
     count: Count sketches.
     build: Build a sketch.
     chunk_build: Build a chunk of sketches.
     check_requirements: Check if target meets sketch requirements.
+    install_libs: Install libraries from ci.json file.
 "
 
 cmd=$1
@@ -606,6 +769,8 @@ case "$cmd" in
     ;;
     "check_requirements") check_requirements "$@"
     ;;
+    "install_libs") install_libs "$@"
+    ;;
     *)
         echo "ERROR: Unrecognized command"
         echo "$USAGE"

docs/en/contributing.rst

@@ -425,6 +425,10 @@ The ``ci.json`` file is used to specify how the test suite and sketches will han
 * ``fqbn``: A dictionary that specifies the FQBNs that will be used to compile the sketch. The key is the target name and the value is a list
   of FQBNs. The `default FQBNs <https://github.com/espressif/arduino-esp32/blob/a31a5fca1739993173caba995f7785b8eed6b30e/.github/scripts/sketch_utils.sh#L86-L91>`_
   are used if this field is not specified. This overrides the default FQBNs and the ``fqbn_append`` field.
+* ``libs``: A list of libraries that are required to run the test suite. The libraries will be installed automatically if they are not already present.
+  Libraries are installed using the ``arduino-cli lib install`` command, so you can specify libraries by name + version (e.g., ``AudioZero@1.0.0``)
+  or by URL (e.g., ``https://github.com/arduino-libraries/WiFi101.git``).
+  More information can be found in the `Arduino CLI documentation <https://arduino.github.io/arduino-cli/1.3/commands/arduino-cli_lib_install/>`_.
 
 The ``wifi`` test suite is a good example of how to use the ``ci.json`` file: