Make information about GNU ln available to programs

Propagate the information on whether we have the GNU version of ln
to all programs by making it available as a constant.
Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Helga Velroyen <helgav@google.com>

Makefile.am

@@ -1839,6 +1839,7 @@ src/AutoConf.hs: Makefile src/AutoConf.hs.in | stamp-directories
 	    -DENABLE_SPLIT_QUERY="$(ENABLE_SPLIT_QUERY)" \
 	    -DENABLE_RESTRICTED_COMMANDS="$(ENABLE_RESTRICTED_COMMANDS)" \
 	    -DENABLE_MOND="$(ENABLE_MOND)" \
+	    -DHAS_GNU_LN="$(HAS_GNU_LN)" \
 	    -DMAN_PAGES="$$(for i in $(notdir $(man_MANS)); do \
 	                    echo -n "$$i" | sed -re 's/^(.*)\.([0-9]+)$$/("\1",\2):/g'; \
 	                    done)" \

lib/constants.py

@@ -1573,6 +1573,10 @@ MOND_LATEST_API_VERSION = 1
 UPGRADE_QUEUE_DRAIN_TIMEOUT = _constants.UPGRADE_QUEUE_DRAIN_TIMEOUT
 UPGRADE_QUEUE_POLL_INTERVAL = _constants.UPGRADE_QUEUE_POLL_INTERVAL
 
+# other constants
+
+HAS_GNU_LN = _constants.HAS_GNU_LN
+
 # Do not re-export imported modules
 del re, _vcsversion, _constants, socket, pathutils, compat
 

src/AutoConf.hs.in

@@ -205,6 +205,9 @@ enableRestrictedCommands = ENABLE_RESTRICTED_COMMANDS
 enableMond :: Bool
 enableMond = ENABLE_MOND
 
+hasGnuLn :: Bool
+hasGnuLn = HAS_GNU_LN
+
 -- Write dictionary with man page name as the key and the section
 -- number as the value
 manPages :: [(String, Int)]

src/Ganeti/HsConstants.hs

@@ -78,6 +78,9 @@ drbdNoMetaFlush = AutoConf.drbdNoMetaFlush
 lvmStripecount :: Int
 lvmStripecount = AutoConf.lvmStripecount
 
+hasGnuLn :: Bool
+hasGnuLn = AutoConf.hasGnuLn
+
 -- * 'autoconf' constants for Python only ('lib/pathutils.py')
 
 -- ** Build-time constants