build: add NO_INSTALL variable

So that we can specify which scripts we do not want to install (they are
for testing).

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -492,6 +492,10 @@ SCRIPT_SH_GEN = $(patsubst %.sh,%,$(SCRIPT_SH))
 SCRIPT_PERL_GEN = $(patsubst %.perl,%,$(SCRIPT_PERL))
 SCRIPT_PYTHON_GEN = $(patsubst %.py,%,$(SCRIPT_PYTHON))
 
+SCRIPT_SH_INS = $(filter-out $(NO_INSTALL),$(SCRIPT_SH_GEN))
+SCRIPT_PERL_INS = $(filter-out $(NO_INSTALL),$(SCRIPT_PERL_GEN))
+SCRIPT_PYTHON_INS = $(filter-out $(NO_INSTALL),$(SCRIPT_PYTHON_GEN))
+
 # Individual rules to allow e.g.
 # "make -C ../.. SCRIPT_PERL=contrib/foo/bar.perl build-perl-script"
 # from subdirectories like contrib/*/
@@ -501,11 +505,11 @@ build-sh-script: $(SCRIPT_SH_GEN)
 build-python-script: $(SCRIPT_PYTHON_GEN)
 
 .PHONY: install-perl-script install-sh-script install-python-script
-install-sh-script: $(SCRIPT_SH_GEN)
+install-sh-script: $(SCRIPT_SH_INS)
 	$(INSTALL) $^ '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
-install-perl-script: $(SCRIPT_PERL_GEN)
+install-perl-script: $(SCRIPT_PERL_INS)
 	$(INSTALL) $^ '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
-install-python-script: $(SCRIPT_PYTHON_GEN)
+install-python-script: $(SCRIPT_PYTHON_INS)
 	$(INSTALL) $^ '$(DESTDIR_SQ)$(gitexec_instdir_SQ)'
 
 .PHONY: clean-perl-script clean-sh-script clean-python-script
@@ -516,9 +520,9 @@ clean-perl-script:
 clean-python-script:
 	$(RM) $(SCRIPT_PYTHON_GEN)
 
-SCRIPTS = $(SCRIPT_SH_GEN) \
-	  $(SCRIPT_PERL_GEN) \
-	  $(SCRIPT_PYTHON_GEN) \
+SCRIPTS = $(SCRIPT_SH_INS) \
+	  $(SCRIPT_PERL_INS) \
+	  $(SCRIPT_PYTHON_INS) \
 	  git-instaweb
 
 ETAGS_TARGET = TAGS