nix: Reset node_modules when Yarn deps change

Signed-off-by: Pedro Pombeiro <pombeirp@users.noreply.github.com>

nix/mobile/reset-node_modules.sh

@@ -22,12 +22,17 @@ deps="$1"
 nodeModulesDir="$STATUS_REACT_HOME/node_modules"
 
 needCopyModules=1
+sentinelFilePath="$nodeModulesDir/.copied~"
 
 # Check if node_modules exists and is valid
 if [ -d "$nodeModulesDir" ]; then
-  if [ -f "$nodeModulesDir/.copied~" ]; then
+  if [ -f "$sentinelFilePath" ]; then
+    existingPath="$(cat $sentinelFilePath)"
+    if [ "${existingPath}" != "${deps}" ]; then
+      echo "Yarn modules changed, copying over new version"
+    else
       echo "Checking for modifications in node_modules..."
-    modifiedFiles=( $(find $nodeModulesDir -writable -type f -newer $nodeModulesDir/.copied~ \
+      modifiedFiles=( $(find $nodeModulesDir -writable -type f -newer $sentinelFilePath \
         -not \( -path "$nodeModulesDir/react-native/third-party/*" -prune \
             -o -path "$nodeModulesDir/react-native/ReactAndroid/build/*" -prune \
             -o -path "$nodeModulesDir/*/android/build/*" -prune \
@@ -40,7 +45,8 @@ if [ -d "$nodeModulesDir" ]; then
         echo "Modifications detected in ${#modifiedFiles[@]} files:\n${modifiedFiles[@]}"
       fi
     fi
-  if [ $needCopyModules -eq 1 ]; then
+  fi
+  if [ $needCopyModules -eq 1 ] && [ -d $nodeModulesDir ]; then
     chmod u+w -R $nodeModulesDir
     rm -rf $nodeModulesDir
   fi
@@ -69,7 +75,7 @@ if [ ! -d "$nodeModulesDir" ]; then
     time cp -HRf --preserve=all ${deps}/node_modules/. "$nodeModulesDir.tmp"
     chmod -R u+w "$nodeModulesDir.tmp"
     mv -f "$nodeModulesDir.tmp" $nodeModulesDir
-    touch $nodeModulesDir/.copied~
+    echo -n "${deps}" > $sentinelFilePath
     trap - ERR INT HUP
     echo "Done"
   fi