--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hg-web/dev.sh	Sun Aug 02 16:50:48 2026 -0700
@@ -0,0 +1,78 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ -n "${RUNFILES_DIR:-}" ]]; then
+  source "$RUNFILES_DIR/bazel_tools/tools/bash/runfiles/runfiles.bash"
+elif [[ -n "${RUNFILES_MANIFEST_FILE:-}" ]]; then
+  runfiles_library="$(
+    grep -sm1 '^bazel_tools/tools/bash/runfiles/runfiles.bash ' \
+      "$RUNFILES_MANIFEST_FILE" | cut -d' ' -f2-
+  )"
+  source "$runfiles_library"
+elif [[ -d "$0.runfiles" ]]; then
+  RUNFILES_DIR="$0.runfiles"
+  export RUNFILES_DIR
+  source "$RUNFILES_DIR/bazel_tools/tools/bash/runfiles/runfiles.bash"
+elif [[ -f "$0.runfiles_manifest" ]]; then
+  RUNFILES_MANIFEST_FILE="$0.runfiles_manifest"
+  export RUNFILES_MANIFEST_FILE
+  runfiles_library="$(
+    grep -sm1 '^bazel_tools/tools/bash/runfiles/runfiles.bash ' \
+      "$RUNFILES_MANIFEST_FILE" | cut -d' ' -f2-
+  )"
+  source "$runfiles_library"
+else
+  echo "Bazel runfiles are unavailable." >&2
+  exit 1
+fi
+
+workspace="${BUILD_WORKSPACE_DIRECTORY:-}"
+if [[ -z "$workspace" || ! -d "$workspace/.hg" ]]; then
+  echo "Run this target from the Zenbu workspace." >&2
+  exit 1
+fi
+
+server="$(rlocation _main/hg-web/hg_web_server)"
+runfiles_workspace="$(dirname "$(dirname "$server")")"
+hg_pid=""
+server_pid=""
+
+cleanup() {
+  trap - EXIT INT TERM
+  for pid in "$server_pid" "$hg_pid"; do
+    if [[ -n "$pid" ]] && kill -0 "$pid" 2>/dev/null; then
+      kill "$pid" 2>/dev/null || true
+    fi
+  done
+  for pid in "$server_pid" "$hg_pid"; do
+    if [[ -n "$pid" ]]; then
+      wait "$pid" 2>/dev/null || true
+    fi
+  done
+}
+
+trap cleanup EXIT
+trap 'exit 130' INT TERM
+
+hg --repository "$workspace" serve \
+  --address 127.0.0.1 \
+  --port 4444 \
+  --accesslog - \
+  --errorlog - &
+hg_pid=$!
+
+(
+  cd "$runfiles_workspace"
+  exec "$server"
+) &
+server_pid=$!
+
+echo "hg-web: http://127.0.0.1:6970"
+echo "Mercurial wire endpoint: http://127.0.0.1:6970/repo"
+echo "Press Ctrl-C to stop both servers."
+
+set +e
+wait -n "$hg_pid" "$server_pid"
+status=$?
+set -e
+exit "$status"