Add a guard against systems with broken /etc/login.defs

jleclanche · jleclanche · commit b5a0c0c62f9a · 2015-07-16T18:31:12.000+02:00
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -167,14 +167,24 @@ endif()
 
 if(NOT DEFINED UID_MIN)
     file(STRINGS "${LOGIN_DEFS_PATH}" UID_MIN LIMIT_COUNT 1 REGEX "^UID_MIN")
-    STRING(REGEX REPLACE "^UID_MIN[\t ]+([0-9]+)" "\\1" UID_MIN "${UID_MIN}")
-    message(STATUS "Autodetected UID_MIN=${UID_MIN} from ${LOGIN_DEFS_PATH}")
+    string(REGEX REPLACE "^UID_MIN[\t ]+([0-9]+)" "\\1" UID_MIN "${UID_MIN}")
+    if(NOT UID_MIN MATCHES "[0-9]+")
+        message(WARNING "Could not detect a valid UID_MIN (got '${UID_MIN}'). You should review your login.defs file.")
+        set(UID_MIN 1000)
+    else()
+        message(STATUS "Autodetected UID_MIN=${UID_MIN} from ${LOGIN_DEFS_PATH}")
+    endif()
 endif()
 
 if(NOT DEFINED UID_MAX)
     file(STRINGS "${LOGIN_DEFS_PATH}" UID_MAX LIMIT_COUNT 1 REGEX "^UID_MAX")
-    STRING(REGEX REPLACE "^UID_MAX[\t ]+([0-9]+)" "\\1" UID_MAX "${UID_MAX}")
-    message(STATUS "Autodetected UID_MAX=${UID_MAX} from ${LOGIN_DEFS_PATH}")
+    string(REGEX REPLACE "^UID_MAX[\t ]+([0-9]+)" "\\1" UID_MAX "${UID_MAX}")
+    if(NOT UID_MAX MATCHES "[0-9]+")
+        message(WARNING "Could not detect a valid UID_MAX (got '${UID_MAX}'). You should review your login.defs file.")
+        set(UID_MAX 65000)
+    else()
+        message(STATUS "Autodetected UID_MAX=${UID_MAX} from ${LOGIN_DEFS_PATH}")
+    endif()
 endif()
 
 # Add subdirectories
