Makefile: add support for building w.o. preinstalled git

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 86b2a70..ccc7582 100644
--- a/Makefile
+++ b/Makefile
@@ -18,8 +18,20 @@ endif
 
 CFLAGS += -Igit -DSHA1_HEADER='$(SHA1_HEADER)'
 
 
+#
+# If make is run on a nongit platform, we need to get the git sources as a tarball.
+# But there is currently no recent enough tarball available on kernel.org, so download
+# a zipfile from hjemli.net instead
+#
+GITVER = $(shell git version 2>/dev/null || echo nogit)
+ifeq ($(GITVER),nogit)
+GITURL = http://hjemli.net/git/git/snapshot/?id=v1.5.2-rc2
+INITGIT = test -e git/git.c || (curl "$(GITURL)" > tmp.zip && unzip tmp.zip)
+else
+INITGIT = ./submodules.sh -i
+endif
 
 
 #
 # basic build rules
@@ -32,9 +44,9 @@ cgit: cgit.c cgit.h $(OBJECTS)
 
 $(OBJECTS): cgit.h git/libgit.a
 
 git/libgit.a:
-        ./submodules.sh -i
+        $(INITGIT)
         $(MAKE) -C git
 
 #
 # phony targets