buck: build standalone jgit binary

Construct the java_application JAR wrapped with the shell script
header.  This is enough to clone a repository over HTTPs:

  $ buck build :jgit_bin
  $ buck-out/gen/jgit_bin/jgit_bin clone https://...

Change-Id: I4aceb4e77b2ec9be76a32ec93d94f2dafe9acce6

1 files changed, 6 insertions, 0 deletions

diff --git a/BUCK b/BUCK
index 7704281ecf..fca0e8a7f4 100644
--- a/BUCK
+++ b/BUCK
@@ -36,3 +36,9 @@ java_library(
   ],
   visibility = ['PUBLIC'],
 )
+
+genrule(
+  name = 'jgit_bin',
+  cmd = 'ln -s $(location //org.eclipse.jgit.pgm:jgit) $OUT',
+  out = 'jgit_bin',
+)