Less brittle meson install, securer downloads

- This makes installing meson a little less brittle.  It's still not
  ideal I guess.
- Push sha256 checksums on all curl downloads, at least we'll all be
  running the same malware this way.
- Only copy the deltachat wheels to the wheelhouse, that avoids having
  to clean up the unintersting wheels.

python/wheelbuilder/Dockerfile

@@ -7,14 +7,19 @@ ENV PKG_CONFIG_PATH /usr/local/lib64/pkgconfig:/usr/local/lib/pkgconfig
 
 # Install meson and ninja
 ENV NINJA_VERSION v1.8.2
+ENV NINJA_SHA256 d2fea9ff33b3ef353161ed906f260d565ca55b8ca0568fa07b1d2cab90a84a07
+RUN curl -L -o ninja-linux-$NINJA_VERSION.zip https://github.com/ninja-build/ninja/releases/download/${NINJA_VERSION}/ninja-linux.zip
+RUN echo "${NINJA_SHA256}  ninja-linux-${NINJA_VERSION}.zip" | sha256sum -c -
+RUN unzip ninja-linux-${NINJA_VERSION}.zip
+RUN mv ninja /usr/bin/ninja
 RUN /opt/python/cp37-cp37m/bin/pip install meson
-RUN cd /usr/bin && ln -s /opt/_internal/cpython-3.7.0/bin/meson
-RUN curl -L -O https://github.com/ninja-build/ninja/releases/download/${NINJA_VERSION}/ninja-linux.zip
-RUN unzip ninja-linux.zip && mv ninja /usr/bin/ninja
+RUN cd /usr/bin && ln -s /opt/_internal/cpython-3.7.*/bin/meson
 
 # Install a recent zlib, needed by libetpan
 ENV ZLIB_VERSION 1.2.11
+ENV ZLIB_SHA256 c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1
 RUN curl -O https://www.zlib.net/zlib-${ZLIB_VERSION}.tar.gz
+RUN echo "${ZLIB_SHA256}  zlib-${ZLIB_VERSION}.tar.gz" | sha256sum -c -
 RUN tar xzf zlib-${ZLIB_VERSION}.tar.gz
 RUN cd zlib-${ZLIB_VERSION} && ./configure
 RUN cd zlib-${ZLIB_VERSION} && make
@@ -23,7 +28,9 @@ RUN ldconfig -v
 
 # Install a recent Perl, needed to install OpenSSL
 ENV PERL_VERSION 5.28.0
+ENV PERL_SHA256 7e929f64d4cb0e9d1159d4a59fc89394e27fa1f7004d0836ca0d514685406ea8
 RUN curl -O https://www.cpan.org/src/5.0/perl-${PERL_VERSION}.tar.gz
+RUN echo "${PERL_SHA256}  perl-${PERL_VERSION}.tar.gz" | sha256sum -c -
 RUN tar xzf perl-${PERL_VERSION}.tar.gz
 RUN cd perl-${PERL_VERSION} && ./Configure -de
 RUN cd perl-${PERL_VERSION} && make
@@ -31,7 +38,9 @@ RUN cd perl-${PERL_VERSION} && make install
 
 # Install OpenSSL
 ENV OPENSSL_VERSION 1.1.1a
+ENV OPENSSL_SHA256 fc20130f8b7cbd2fb918b2f14e2f429e109c31ddd0fb38fc5d71d9ffed3f9f41
 RUN curl -O https://www.openssl.org/source/openssl-${OPENSSL_VERSION}.tar.gz
+RUN echo "${OPENSSL_SHA256}  openssl-${OPENSSL_VERSION}.tar.gz" | sha256sum -c -
 RUN tar xzf openssl-${OPENSSL_VERSION}.tar.gz
 RUN cd openssl-${OPENSSL_VERSION} && \
     ./config shared no-ssl2 no-ssl3 -fPIC --prefix=/usr/local
@@ -42,12 +51,13 @@ RUN cd openssl-${OPENSSL_VERSION} && \
 RUN cd openssl-${OPENSSL_VERSION} && make depend
 RUN cd openssl-${OPENSSL_VERSION} && make
 RUN cd openssl-${OPENSSL_VERSION} && make install_sw install_ssldirs
-
 RUN ldconfig -v
 
 # Install cyrus-sasl
 ENV SASL_VERSION 2.1.27
+ENV SASL_SHA256 26866b1549b00ffd020f188a43c258017fa1c382b3ddadd8201536f72efb05d5
 RUN curl -O ftp://ftp.cyrusimap.org/cyrus-sasl/cyrus-sasl-${SASL_VERSION}.tar.gz
+RUN echo "${SASL_SHA256}  cyrus-sasl-${SASL_VERSION}.tar.gz" | sha256sum -c -
 RUN tar zxf cyrus-sasl-${SASL_VERSION}.tar.gz
 RUN cd cyrus-sasl-${SASL_VERSION} && \
     ./configure --disable-silent-rules \
@@ -85,10 +95,13 @@ RUN ldconfig -v
 
 # Install libetpan
 ENV ETPAN_VERSION 1.9.1
+ENV ETPAN_SHA256 f5e354ccf1014c6ee313ade1009b8a82f28043d2504655e388bb4c1328700fcd
 RUN curl -L -o libetpan-${ETPAN_VERSION}.tar.gz \
     https://github.com/dinhviethoa/libetpan/archive/${ETPAN_VERSION}.tar.gz
+RUN echo "${ETPAN_SHA256}  libetpan-${ETPAN_VERSION}.tar.gz" | sha256sum -c -
 RUN tar xzf libetpan-${ETPAN_VERSION}.tar.gz
-RUN cd libetpan-${ETPAN_VERSION} && ./autogen.sh && \
+RUN cd libetpan-${ETPAN_VERSION} && \
+    ./autogen.sh && \
     ./configure --enable-ipv6 \
                 --disable-iconv --disable-db \
                 --with-openssl --with-sasl --with-zlib \

python/wheelbuilder/build-wheels.sh

@@ -16,13 +16,10 @@ for PYBIN in /opt/python/*/bin; do
 done
 
 ## Bundle external shared libraries into the wheels
-for whl in wheelhouse/*.whl; do
+for whl in wheelhouse/deltachat*.whl; do
     auditwheel repair "$whl" -w /io/python/wheelhouse/
 done
 
-# Clean up the cffi wheels which end up in the wheelhouse
-rm -rf /io/python/wheelhouse/cffi*.whl
-
 ## Install packages (and test)
 for PYBIN in /opt/python/*/bin/; do
     "${PYBIN}/pip" install deltachat --no-index -f /io/python/wheelhouse