Allow the environment to override where gnupg looks for its own files. Useful in native builds.

Upstream-Status: Inappropriate [OE-specific]
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/common/homedir.c b/common/homedir.c
index e9e75d01e..19140aa0d 100644
--- a/common/homedir.c
+++ b/common/homedir.c
@@ -760,7 +760,7 @@ gnupg_socketdir (void)
   if (!name)
     {
       unsigned int dummy;
-      name = _gnupg_socketdir_internal (0, &dummy);
+      name = getenv("GNUPG_SOCKETDIR") ?: _gnupg_socketdir_internal (0, &dummy);
     }
 
   return name;
@@ -786,7 +786,7 @@ gnupg_sysconfdir (void)
     }
   return name;
 #else /*!HAVE_W32_SYSTEM*/
-  return GNUPG_SYSCONFDIR;
+  return getenv("GNUPG_SYSCONFDIR") ?: GNUPG_SYSCONFDIR;
 #endif /*!HAVE_W32_SYSTEM*/
 }
 
@@ -815,7 +815,7 @@ gnupg_bindir (void)
   else
     return rdir;
 #else /*!HAVE_W32_SYSTEM*/
-  return GNUPG_BINDIR;
+  return getenv("GNUPG_BINDIR") ?: GNUPG_BINDIR;
 #endif /*!HAVE_W32_SYSTEM*/
 }
 
@@ -828,7 +828,7 @@ gnupg_libexecdir (void)
 #ifdef HAVE_W32_SYSTEM
   return gnupg_bindir ();
 #else /*!HAVE_W32_SYSTEM*/
-  return GNUPG_LIBEXECDIR;
+  return getenv("GNUPG_LIBEXECDIR") ?: GNUPG_LIBEXECDIR;
 #endif /*!HAVE_W32_SYSTEM*/
 }
 
@@ -842,7 +842,7 @@ gnupg_libdir (void)
     name = xstrconcat (w32_rootdir (), DIRSEP_S "lib" DIRSEP_S "gnupg", NULL);
   return name;
 #else /*!HAVE_W32_SYSTEM*/
-  return GNUPG_LIBDIR;
+  return getenv("GNUPG_LIBDIR") ?: GNUPG_LIBDIR;
 #endif /*!HAVE_W32_SYSTEM*/
 }
 
@@ -856,7 +856,7 @@ gnupg_datadir (void)
     name = xstrconcat (w32_rootdir (), DIRSEP_S "share" DIRSEP_S "gnupg", NULL);
   return name;
 #else /*!HAVE_W32_SYSTEM*/
-  return GNUPG_DATADIR;
+  return getenv("GNUPG_DATADIR") ?: GNUPG_DATADIR;
 #endif /*!HAVE_W32_SYSTEM*/
 }
 
@@ -872,7 +872,7 @@ gnupg_localedir (void)
                        NULL);
   return name;
 #else /*!HAVE_W32_SYSTEM*/
-  return LOCALEDIR;
+  return getenv("LOCALEDIR") ?: LOCALEDIR;
 #endif /*!HAVE_W32_SYSTEM*/
 }
 
@@ -940,7 +940,7 @@ gnupg_cachedir (void)
     }
   return dir;
 #else /*!HAVE_W32_SYSTEM*/
-  return GNUPG_LOCALSTATEDIR "/cache/" PACKAGE_NAME;
+  return getenv("GNUPG_LOCALSTATEDIR") ?: GNUPG_LOCALSTATEDIR "/cache/" PACKAGE_NAME;
 #endif /*!HAVE_W32_SYSTEM*/
 }