src/gistatic.in: Initial sh version

I got a bit frustrated that libgit2 didn't offer an API
or "git archive" commands.  I started implementing generating tarballs
from scratch in src/tar.c and I'm quite liking it: the specification is
very small, and the code can be very simple, since all I'm doing is
writing fresh tarballs, and not reading or updating them.

However I felt a bit locked-in to libgit2 itself, and what a detour from
my original goal that is, and the question "what should libgit2 provide"
came up to my mind.  This made me realize that libgit2 is playing
catch-up with Git itself, for as long as Git doesn't explicit has an
explicit API, a standard, a public version of its internal libgit.a, or
something like that.  In fact, I'm locked in to Git, even.

So even though a C version would probably be much faster, it wouldn't
really have less dependencies, and that's what I'm actually optimising
for: having the software be as portable as possible.  On that front, C
is unbeatable with sh as a close second.  But the extreme portability
of C aren't being fully exploited here: libgit2 does depend on non-POSIX
things like CMake (and quick grep even shows
references to -D_GNU_SOURCE!!), and Git's Makefile itself isn't POSIX
at all.  The point is: by depending on either Git or libgit2, I'm
already loosing many selling points of writing the software in C, and
sh becomes much more attractive.  Had existed a common DVCS interface
that could make me decouple gistatic from Git somehow I would insist a
bit more in C, but now I'm switching to sh.

The fact that I was able to get further with sh in one sitting than I
did with C shows that a) I'm a bit less fluent in C than I would like
(at least for now ^^) and b) that it is actually much simpler to do.

I am quite satisfied with the quality of C code that I got so far.  The
error handling and propagation is pretty robust, and the implementation
is very disciplined.  I did most of the development with Valgrind, and
other sanitizers would help even further, with some fuzzers on top.

1 files changed, 3 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index 5aa3159..48a52ef 100644
--- a/Makefile
+++ b/Makefile
@@ -19,6 +19,7 @@ LDLIBS       = -lgit2
 		-e 's:@DATE@:$(DATE):g'       \
 		-e 's:@NAME@:$(NAME):g'       \
 		< $< > $@
+	if [ -x $< ]; then chmod +x $@; fi
 
 .c.o:
 	$(CC) $(CFLAGS)        -o $@ -c $<
@@ -44,7 +45,7 @@ all-objects = $(lib-objects) src/main.o
 t-objects   = $(sources:.c=.to) src/tests-lib.to src/main.to
 
 
-all: libgistatic.a gistatic $(manpages)
+all: libgistatic.a gistatic src/gistatic $(manpages)
 
 libgistatic.a: $(lib-objects)
 	$(AR) $(ARFLAGS) $@ $(lib-objects)
@@ -85,7 +86,7 @@ clean:
 	rm -rf \
 		public/ $(manpages) README.*.md CHANGELOG.*.md messages.mo \
 		vgcore.* tmp/ src/config.h $(all-objects) $(t-objects)     \
-		libgistatic.a gistatic gistatic-tests                      \
+		libgistatic.a gistatic gistatic-tests src/gistatic         \
 		tests/resources/repositories/repo-1/.git                   \
 		tests/resources/repositories/repo-2/.git