Produce a single-file self-extracting script for OSS

Summary:
For the benefit of Buck, homebrew, and all the users who have no idea
what redex-all is, we'll now build redex as a magic self-extracting script.  The
script contains a bash extraction preamble followed by a tar file containing
redex-all and the python wrapper (and libraries).  When `redex` is invoked it
untars this payload to a temp location, executes redex with the specified
parameters, and then deletes the untarred payload.

Differential Revision: D4401602

fbshipit-source-id: 94fa04d7a966be55ab86720c4d426ea566b562bb

Makefile.am

@@ -112,7 +112,8 @@ libredex_la_LIBADD = \
 #
 # redex-all: the main executable
 #
-bin_PROGRAMS = redex-all redexdump
+bin_PROGRAMS = redexdump
+noinst_PROGRAMS = redex-all
 
 redex_all_SOURCES = \
 	opt/annoclasskill/AnnoClassKill.cpp \
@@ -177,11 +178,12 @@ redexdump_LDADD = \
 #
 bin_SCRIPTS = redex apkutil
 CLEANFILES = redex
-EXTRA_DIST = redex.py
 
-redex: redex.py Makefile
-	cp $(srcdir)/redex.py redex
-	chmod +x redex
+PYTHON_SRCS := redex.py \
+	pyredex/__init__.py \
+	pyredex/log.py \
+	pyredex/unpacker.py \
+	pyredex/utils.py
 
-install-exec-hook:
-	cp -r $(srcdir)/pyredex $(DESTDIR)$(bindir)
+redex: redex-all $(PYTHON_SRCS)
+	$(srcdir)/bundle-redex.sh

bundle-redex.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+tar czf redex.tar.gz redex-all redex.py pyredex/*.py
+cat selfextract.sh redex.tar.gz > redex
+chmod +x redex

redex.py

@@ -66,9 +66,12 @@ def run_pass(
         ):
 
     if executable_path is None:
-        executable_path = subprocess.check_output(['which', 'redex-all']).rstrip()
-        if executable_path is None:
-            executable_path = join(dirname(abspath(__file__)), 'redex-all')
+        try:
+            executable_path = subprocess.check_output(['which', 'redex-all']).rstrip()
+        except subprocess.CalledProcessError:
+            pass
+    if executable_path is None:
+        executable_path = join(dirname(abspath(__file__)), 'redex-all')
     if not isfile(executable_path) or not os.access(executable_path, os.X_OK):
         sys.exit('redex-all is not found or is not executable')
     log('Running redex binary at ' + executable_path)

selfextract.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+export TMPDIR=`mktemp -d /tmp/redex.XXXXXX`
+ARCHIVE=`awk '/^__ARCHIVE_BELOW__/ { print NR + 1; exit 0 }' $0`
+tail -n+$ARCHIVE $0 | tar xz -C $TMPDIR
+
+$TMPDIR/redex.py $@
+
+rm -rf $TMPDIR
+exit 0
+
+__ARCHIVE_BELOW__