diff --git a/calculate/vars/main/cl/__init__.py b/calculate/vars/main/cl/__init__.py
new file mode 100644
index 0000000..18213e9
--- /dev/null
+++ b/calculate/vars/main/cl/__init__.py
@@ -0,0 +1,33 @@
+import os
+from calculate.utils.fs import readFile
+from calculate.variables.datavars import Variable, Namespace, Dependence, \
+    StringType, BooleanType, Calculate
+
+def get_ebuild_phase():
+    return os.environ.get("EBUILD_PHASE", "")
+
+def get_chroot_status():
+    """Detect chroot mode by different mountinfo"""
+    pid = os.getpid()
+    try:
+        if not os.access('/proc/self/mountinfo', R_OK) or \
+                not os.access('/proc/1/mountinfo', R_OK):
+            return False
+        infos = [readFile(x) for x in ('/proc/1/mountinfo',
+                                       '/proc/self/mountinfo')]
+        return infos[0] != infos[1]
+    except Exception:
+        return False
+
+def is_system_boot():
+    if os.readlink('/proc/self/fd/0') == '/dev/console':
+        return True
+    else:
+        return False
+
+Variable("ebuild_phase", type=StringType,
+    source=Calculate(get_ebuild_phase))
+Variable("chroot_status", type=BooleanType,
+    source=Calculate(get_chroot_status))
+Variable("system_boot_set", type=BooleanType,
+    source=Calculate(is_system_boot))