Add build scripts for creating manylinux wheels.

build-scripts/README

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+### Building wheels
+
+This directory contains a utility script (`build.sh`) which can be used to 
+create completely self-contained manylinux wheels for Python 3.6 and 3.7. The 
+build script fetches the latest release of Sqlcipher and generates the source
+amalgamation and header file, which are then compiled into `sqlcipher3`. The
+resulting Python package can be deployed to any linux environment and will
+utilize the latest Sqlcipher source code with extensions compiled in.
+
+The package name for the wheels is `sqlcipher3-binary` to differentiate it from
+the standard `sqlcipher3` source distribution. The source distribution will 
+link against the system sqlcipher by default, though you can provide your own
+`sqlite3.c` and `sqlite3.h` and use `setup.py build_static` to create a
+self-contained package as well.
+
+Build artifacts are placed in the `wheelhouse/` directory.

build-scripts/_build_wheels.sh

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+#!/bin/bash
+
+# manylinux uses ancient Centos 5, which ships openssl 0.9.8. We need to build
+# our own in order to then build sqlcipher. The SSL headers will be installed
+# to /usr/local/.
+#
+# The code for installing Perl and OpenSSL is derived from the psycopg2-binary
+# build scripts.
+yum install -y zlib-devel
+
+OPENSSL_VERSION="1.1.1b"
+OPENSSL_TAG="OpenSSL_${OPENSSL_VERSION//./_}"
+
+cd /io
+
+if [ ! -d "openssl-${OPENSSL_TAG}/" ]; then
+  # Building openssl 1.1 requires perl 5.10 or newer.
+  curl -L https://install.perlbrew.pl | bash
+  source ~/perl5/perlbrew/etc/bashrc
+  perlbrew install --notest perl-5.16.0
+  perlbrew switch perl-5.16.0
+
+  curl -sL https://github.com/openssl/openssl/archive/${OPENSSL_TAG}.tar.gz \
+    | tar xzf -
+
+  cd "openssl-${OPENSSL_TAG}"
+
+  # Expose the lib version number in the .so file name.
+  sed -i "s/SHLIB_VERSION_NUMBER\s\+\".*\"/SHLIB_VERSION_NUMBER \"${OPENSSL_VERSION}\"/" \
+      ./include/openssl/opensslv.h
+  sed -i "s|if (\$shlib_version_number =~ /(^\[0-9\]\*)\\\.(\[0-9\\\.\]\*)/)|if (\$shlib_version_number =~ /(^[0-9]*)\.([0-9\.]*[a-z]?)/)|" \
+      ./Configure
+
+  ./config --prefix=/usr/local/ --openssldir=/usr/local/ zlib -fPIC shared
+  make depend && make && make install
+fi
+
+# Volume (cwd of build script) is mounted at /io.
+# A checkout of sqlcipher3 is cloned beforehand by the build.sh script.
+cd /io/sqlcipher3
+
+sed -i "s|name='sqlcipher3-binary'|name=PACKAGE_NAME|g" setup.py
+
+export CFLAGS="-I/usr/local/include -L/usr/local/lib"
+
+PY36="/opt/python/cp36-cp36m/bin"
+"${PY36}/python" setup.py build_static
+
+PY37="/opt/python/cp37-cp37m/bin"
+"${PY37}/python" setup.py build_static
+
+# Replace the package name defined in setup.py so we can push this to PyPI
+# without stomping on the source dist.
+sed -i "s|name=PACKAGE_NAME,|name='sqlcipher3-binary',|g" setup.py
+
+"${PY36}/pip" wheel /io/sqlcipher3 -w /io/wheelhouse
+"${PY37}/pip" wheel /io/sqlcipher3 -w /io/wheelhouse
+
+for whl in /io/wheelhouse/*.whl; do
+  auditwheel repair "$whl" -w /io/wheelhouse/
+done

build-scripts/build.sh

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+#!/bin/bash
+
+set -e -x
+
+# Fetch the source code for SQLCipher.
+if [[ ! -d "sqlcipher" ]]; then
+  git clone --depth=1 git@github.com:sqlcipher/sqlcipher
+  cd sqlcipher/
+  ./configure --disable-tcl --enable-tempstore=yes LDFLAGS="-lcrypto -lm"
+  make sqlite3.c
+  cd ../
+fi
+
+# Grab the sqlcipher3 source code.
+if [[ ! -d "./sqlcipher3" ]]; then
+  git clone git@github.com:coleifer/sqlcipher3
+fi
+
+# Copy the sqlcipher source amalgamation into the pysqlite3 directory so we can
+# create a self-contained extension module.
+cp "sqlcipher/sqlite3.c" sqlcipher3/
+cp "sqlcipher/sqlite3.h" sqlcipher3/
+
+# Create the wheels and strip symbols to produce manylinux wheels.
+docker run -it -v $(pwd):/io quay.io/pypa/manylinux1_x86_64 /io/_build_wheels.sh

build-scripts/cleanup.sh

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+#!/bin/bash
+
+cleanup="openssl-OpenSSL_1_1_1b sqlcipher sqlcipher3 wheelhouse"
+for p in $cleanup; do
+  if [[ -d "$p" ]]; then
+    sudo rm -rf "$p"
+  fi
+done