Print an error if cloning a http repo and NO_CURL is set

If Git is compiled with NO_CURL=YesPlease and one tries to
clone a http repository, git-clone tries to call the curl
binary. This trivial patch prints an error instead in such
situation.

Signed-off-by: Fernando J. Pereda <ferdy@gentoo.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

Makefile

@@ -419,6 +419,7 @@ $(patsubst %.sh,%,$(SCRIPT_SH)) : % : %.sh
 	rm -f $@
 	sed -e '1s|#!.*/sh|#!$(call shq,$(SHELL_PATH))|' \
 	    -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \
+	    -e 's/@@NO_CURL@@/$(NO_CURL)/g' \
 	    $@.sh >$@
 	chmod +x $@
 

git-clone.sh

@@ -206,7 +206,13 @@ yes,yes)
 		fi
 		;;
 	http://*)
-		clone_dumb_http "$repo" "$D"
+		if test -z "@@NO_CURL@@"
+		then
+			clone_dumb_http "$repo" "$D"
+		else
+			echo >&2 "http transport not supported, rebuild Git with curl support"
+			exit 1
+		fi
 		;;
 	*)
 		cd "$D" && case "$upload_pack" in