From 3f698caea8b6e35f89963e8ad633a9f6ca8f4970 Mon Sep 17 00:00:00 2001
From: Ronan Le Martret <ronan@fridu.net>
Date: Tue, 08 Jul 2014 10:40:21 +0200
Subject: [PATCH] Add env value SYSROOT for root fs prefix

Change-Id: I5c57494317473dcd74c85cbc2bce19a6d68c2739
Signed-off-by: Ronan Le Martret <ronan@fridu.net>
---

diff --git a/src/foreign.c b/src/foreign.c
index a19f6ad..6b172b2 100644
--- a/src/foreign.c
+++ b/src/foreign.c
@@ -85,6 +85,11 @@
         default: break;
         }
     }
+#if _FOREIGN_HAS_(SYSROOT)
+    else if (length == 7)
+        if (name[0]=='S' && name[1]=='Y' && name[2]=='S' && name[3]=='R' && name[4]=='O' && name[5]=='O' && name[6]=='T')
+            return SYSROOT;
+#endif
     return _FOREIGN_INVALID_;
 }
 
diff --git a/src/foreign.h b/src/foreign.h
index 646a41d..6b1ea06 100644
--- a/src/foreign.h
+++ b/src/foreign.h
@@ -24,26 +24,28 @@
 #ifndef FOREIGN_H
 #define FOREIGN_H
 
-#define _FOREIGN_MASK_HOME_    1
-#define _FOREIGN_MASK_UID_     2
-#define _FOREIGN_MASK_USER_    4
-#define _FOREIGN_MASK_GID_     8
-#define _FOREIGN_MASK_EHOME_  16
-#define _FOREIGN_MASK_EUID_   32
-#define _FOREIGN_MASK_EUSER_  64
+#define _FOREIGN_MASK_HOME_       1
+#define _FOREIGN_MASK_UID_        2
+#define _FOREIGN_MASK_USER_       4
+#define _FOREIGN_MASK_GID_        8
+#define _FOREIGN_MASK_EHOME_     16
+#define _FOREIGN_MASK_EUID_      32
+#define _FOREIGN_MASK_EUSER_     64
+#define _FOREIGN_MASK_SYSROOT_  128
 
 #define _FOREIGNS_TO_USE_   ( _FOREIGN_MASK_HOME_  \
-                            | _FOREIGN_MASK_USER_  )
+                            | _FOREIGN_MASK_USER_  \
+                            | _FOREIGN_MASK_SYSROOT_)
 
 #define _FOREIGN_HAS_(x)  (0 != ((_FOREIGNS_TO_USE_) & (_FOREIGN_MASK_##x##_)))
 
 enum fkey {
-    _FOREIGN_INVALID_ = -1, 
+    _FOREIGN_INVALID_ = -1,
 #if _FOREIGN_HAS_(HOME)
     HOME,
 #endif
 #if _FOREIGN_HAS_(UID)
-    UID, 
+    UID,
 #endif
 #if _FOREIGN_HAS_(USER)
     USER,
@@ -52,14 +54,17 @@
     GID, 
 #endif
 #if _FOREIGN_HAS_(EHOME)
-    EHOME, 
+    EHOME,
 #endif
 #if _FOREIGN_HAS_(EUID)
-    EUID, 
+    EUID,
 #endif
 #if _FOREIGN_HAS_(EUSER)
     EUSER,
 #endif
+#if _FOREIGN_HAS_(SYSROOT)
+    SYSROOT,
+#endif
     _FOREIGN_COUNT_
 };
 
diff --git a/src/init.c b/src/init.c
index 76868cc..9d16d86 100644
--- a/src/init.c
+++ b/src/init.c
@@ -63,7 +63,8 @@
 
 #define _HAS_IDS_   (  _FOREIGN_HAS_(UID)  \
                     || _FOREIGN_HAS_(EUID) \
-                    || _FOREIGN_HAS_(GID)  )
+                    || _FOREIGN_HAS_(GID)  \
+                    || _FOREIGN_HAS_(SYSROOT) )
 
 #define _HAS_PWS_   (  _FOREIGN_HAS_(HOME)  \
                     || _FOREIGN_HAS_(USER)  \
@@ -275,7 +276,7 @@
 }
 
 /* callback for solving variables */
-static const char *getcb( struct parsing *parsing, 
+static const char *getcb( struct parsing *parsing,
             const char *key, size_t length,
             size_t begin_pos, size_t end_pos)
 {
@@ -284,6 +285,15 @@
     size_t offset;
     struct reading *reading = parsing->data;
     int id;
+    char *res_sysroot;
+
+    if (strncmp( key, "SYSROOT", 7) == 0) {
+        res_sysroot = getenv("SYSROOT");
+        if (res_sysroot == NULL)
+            return "";
+        else
+            return res_sysroot;
+    }
 
     /* try to find a tzplatform variable */
     id = hashid(key, length);