Revert "Updates objectc script to accept relative paths. (#35190)" (flutter/engine#35265)

This reverts commit 0d334c8f830199bfdf70e08b174bb5570ec8efa9.

engine/src/flutter/tools/gen_objcdoc.sh

@@ -7,29 +7,27 @@
 
 set -e
 
-if [[ $# -eq 0 ]]; then
-   echo "Error: Argument specifying output directory required."
-   exit 1
-fi
-
-# Move to the flutter checkout
-SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
-pushd "$SCRIPT_DIR/../../flutter"
-
 FLUTTER_UMBRELLA_HEADER=$(find ../out -maxdepth 4 -type f -name Flutter.h | grep 'ios_' | head -n 1)
 if [[ ! -f "$FLUTTER_UMBRELLA_HEADER" ]]
   then
       echo "Error: This script must be run at the root of the Flutter source tree with at least one built Flutter.framework in ../out/ios*/Flutter.framework."
-      echo "Running from: $(pwd)"
       exit 1
 fi
 
-OUTPUT_DIR="$1/objectc_docs"
-ZIP_DESTINATION="$1"
-if [ "${OUTPUT_DIR:0:1}" != "/" ]
-then
-  ZIP_DESTINATION="$SCRIPT_DIR/../../$1"
-  OUTPUT_DIR="$ZIP_DESTINATION/objectc_docs"
+
+# If the script is running from within LUCI we use the LUCI_WORKDIR, if not we force the caller of the script
+# to pass an output directory as the first parameter.
+OUTPUT_DIR=""
+
+if [[ -z "$LUCI_CI" ]]; then
+  if [[ $# -eq 0 ]]; then
+    echo "Error: Argument specifying output directory required."
+    exit 1
+  else
+    OUTPUT_DIR="$1"
+  fi
+else
+  OUTPUT_DIR="$LUCI_WORKDIR/objectc_docs"
 fi
 
 # If GEM_HOME is set, prefer using its copy of jazzy.
@@ -85,8 +83,3 @@ if [[ $EXPECTED_CLASSES != $ACTUAL_CLASSES ]]; then
   diff <(echo "$EXPECTED_CLASSES") <(echo "$ACTUAL_CLASSES")
   exit -1
 fi
-
-# Create the final zip file.
-pushd $OUTPUT_DIR
-zip -r "$ZIP_DESTINATION/ios-objcdoc.zip" .
-popd