diff --git a/pym/bob/input.py b/pym/bob/input.py
index d61ee67b..a40ae7bd 100644
--- a/pym/bob/input.py
+++ b/pym/bob/input.py
@@ -687,11 +687,6 @@ def __init__(self, coreStep, env, enabled, spec):
         }
         self.user = recipeSet.getSandboxUser() or spec.get('user', "nobody")
 
-        self.user = {
-            k : env.substitute(v, "providedSandbox::user")
-            for (k, v) in spec.get('user', {}).items()
-        }
-
         # Calculate a "resultId" so that only identical sandboxes match
         h = hashlib.sha1()
         h.update(self.coreStep.variantId)
@@ -708,7 +703,6 @@ def __init__(self, coreStep, env, enabled, spec):
             h.update(struct.pack("<II", len(key), len(val)))
             h.update((key+val).encode('utf8'))
         h.update(self.user.encode('utf8'))
-
         self.resultId = h.digest()
 
     def __eq__(self, other):
@@ -770,7 +764,6 @@ def getUser(self):
         """Get user identity in sandbox.
 
         Returns one of 'nobody', 'root' or '$USER'.
-
         """
         return self.coreSandbox.user
 
@@ -2871,12 +2864,6 @@ def validate(self, data):
 
         raise schema.SchemaError(None, "Mount entry must be a string or a two/three items list!")
 
-class UserValidator:
-    def validate(self, data):
-        if isinstance(data, dict):
-            return ({data[0]:data[1]})
-        raise schema.SchemaError(None, "User entry must be a dictionary type list!")
-
 class RecipeSet:
     """The RecipeSet corresponds to the project root directory.
 
@@ -3102,7 +3089,6 @@ def removeWhiteList(x):
                 schema.Schema({
                     schema.Optional('mount') : schema.Schema([ MountValidator() ]),
                     schema.Optional('paths') : [str],
-
                     schema.Optional('user') : schema.Or("nobody", "root", "$USER"),
                 }),
                 lambda x: updateDicRecursive(self.__sandboxOpts, x),
diff --git a/pym/bob/intermediate.py b/pym/bob/intermediate.py
index dcb37afe..83f5fcc1 100644
--- a/pym/bob/intermediate.py
+++ b/pym/bob/intermediate.py
@@ -208,12 +208,7 @@ def getAllDepSteps(self):
         return [ self.mungeStep(dep) for dep in self.__data['allDepSteps'] ]
 
     def getEnv(self):
-        envs = dict(self.__data['env'])
-        for (name, tool) in sorted(self.getTools().items()):
-            for(key, value) in tool.getEnv().items():
-                if (key in envs) and (value.startswith(("./", "../"))):
-                    envs[key] = os.path.join(tool.getStep().getExecPath(self), value)
-        return envs
+        return self.__data['env']
 
     def getPaths(self):
         # FIXME: rename to getToolPaths
@@ -485,7 +480,6 @@ def fromTool(cls, tool, graph):
         self.__data['step'] = graph.addStep(tool.getStep(), True)
         self.__data['path'] = tool.getPath()
         self.__data['libs'] = tool.getLibs()
-        self.__data['envs'] = tool.getEnvironment()
         return self
 
     @classmethod
@@ -506,9 +500,6 @@ def getPath(self):
     def getLibs(self):
         return self.__data['libs']
 
-    def getEnv(self):
-        return self.__data['envs']
-
 class RecipeIR(AbstractIR):
     @classmethod
     def fromRecipe(cls, recipe, graph):
diff --git a/pym/bob/invoker.py b/pym/bob/invoker.py
index 43638747..c3204c3d 100644
--- a/pym/bob/invoker.py
+++ b/pym/bob/invoker.py
@@ -267,20 +267,6 @@ async def __runCommand(self, args, cwd, stdout=None, stderr=None,
 
         return FinishedProcess(ret, stdoutBuf, stderrBuf)
 
-    # UID is not in the environment variables
-    def __get_uid_value(self, variable_name):
-        if variable_name.isdigit():
-            return str(variable_name)
-        else:
-            return str(os.getuid())
-
-    # GID is not in the environment variables
-    def __get_gid_value(self, variable_name):
-        if variable_name.isdigit():
-            return str(variable_name)
-        else:
-            return str(os.getgid())
-
     def __getSandboxCmds(self, tmpDir):
         if sys.platform != "linux":
             self.fail("Sandbox builds are only supported on Linux!")
@@ -307,11 +293,6 @@ def __getSandboxCmds(self, tmpDir):
                 cmdArgs.extend(["-w", sndbxPath])
             elif hostPath != sndbxPath:
                 cmdArgs.extend(["-m", sndbxPath])
-        if 'uid' in self.__spec.sandboxUser:
-            cmdArgs.extend(["-U", self.__get_uid_value(self.__spec.sandboxUser['uid'])])
-
-        if 'gid' in self.__spec.sandboxUser:
-            cmdArgs.extend(["-G", self.__get_gid_value(self.__spec.sandboxUser['gid'])])
 
         if self.__spec.sandboxUser == "root":
             cmdArgs.append("-r")
diff --git a/src/namespace-sandbox/namespace-sandbox.c b/src/namespace-sandbox/namespace-sandbox.c
index bf68acc6..d8367bae 100644
--- a/src/namespace-sandbox/namespace-sandbox.c
+++ b/src/namespace-sandbox/namespace-sandbox.c
@@ -64,10 +64,8 @@ struct Options {
   int num_mounts;            // How many mounts were specified
   char **create_dirs;        // empty dirs to create (-d)
   int num_create_dirs;       // How many empty dirs to create were specified
-
   uid_t uid;                 // User id in namespace
   uid_t gid;                 // Group id in namespace
-
   int create_netns;          // If 1, create a new network namespace.
   const char *host_name;     // Host name (-H)
 };
@@ -142,8 +140,6 @@ static void Usage(int argc, char *const *argv, const char *fmt, ...) {
       "  -i if set, keep the uid/gid\n"
       "  -r if set, make the uid/gid be root, otherwise use nobody\n"
       "  -H <name> set host name\n"
-      "  -U <uid> set custom uid\n"
-      "  -G <gid> set custom gid\n"
       "  -D  if set, debug info will be printed\n"
       "  -l <file>  redirect stdout to a file\n"
       "  -L <file>  redirect stderr to a file\n"
@@ -246,20 +242,6 @@ static void ParseOptionsFile(const char *filename, struct Options *opt) {
   ParseCommandLine(sub_argc, sub_argv, opt);
 }
 
-// Function to check if a string is a numeric string
-bool IsNumeric(const char *str) {
-    if (str == NULL || *str == '\0') {
-        return false;
-    }
-    while (*str) {
-        if (*str < '0' || *str > '9') {
-            return false;
-        }
-        str++;
-    }
-    return true;
-}
-
 // Parse the command line flags and return the result in an Options structure
 // passed as argument.
 static void ParseCommandLine(int argc, char *const *argv, struct Options *opt) {
@@ -268,7 +250,6 @@ static void ParseCommandLine(int argc, char *const *argv, struct Options *opt) {
   int c;
 
   while ((c = getopt(argc, argv, ":CDd:il:L:m:M:nrS:W:w:H:")) != -1) {
-
     switch (c) {
       case 'C':
         // Shortcut for the "does this system support sandboxing" check.
@@ -350,20 +331,6 @@ static void ParseCommandLine(int argc, char *const *argv, struct Options *opt) {
       case 'H':
         opt->host_name = optarg;
         break;
-      case 'U':
-        if (IsNumeric(optarg)) {
-          opt->custom_uid = atoi(optarg);
-        } else {
-          Usage(argc, argv, "The -U option must be a numeric string.");
-        }
-        break;
-      case 'G':
-        if (IsNumeric(optarg)) {
-          opt->custom_gid = atoi(optarg);
-        } else {
-          Usage(argc, argv, "The -G option must be a numeric string.");
-        }
-        break;
       case 'D':
         global_debug = true;
         break;
@@ -719,8 +686,6 @@ static void ExecCommand(char *const *argv) {
 
 int main(int argc, char *const argv[]) {
   struct Options opt;
-  opt.custom_uid =  kNobodyUid;
-  opt.custom_gid =  kNobodyGid;
   memset(&opt, 0, sizeof(opt));
   opt.uid = kNobodyUid;
   opt.gid = kNobodyGid;
@@ -759,10 +724,8 @@ int main(int argc, char *const argv[]) {
   // outside environment.
   CHECK_CALL(mount("none", "/", NULL, MS_REC | MS_PRIVATE, NULL));
 
-
   SetupDirectories(&opt, opt.uid);
   SetupUserNamespace(uid, gid, opt.uid, opt.gid);
-
   if (opt.host_name) {
     CHECK_CALL(sethostname(opt.host_name, strlen(opt.host_name)));
   }