Add libz and libpq to support diesel

Dockerfile

@@ -54,18 +54,39 @@ WORKDIR /home/rust/libs
 
 # Build a static library version of OpenSSL using musl-libc.  This is
 # needed by the popular Rust `hyper` crate.
-RUN VERS=1.0.2l && \
+RUN echo "Building OpenSSL" && \
+    VERS=1.0.2l && \
     curl -O https://www.openssl.org/source/openssl-$VERS.tar.gz && \
     tar xvzf openssl-$VERS.tar.gz && cd openssl-$VERS && \
     env CC=musl-gcc ./config --prefix=/usr/local/musl && \
     env C_INCLUDE_PATH=/usr/local/musl/include/ make depend && \
     make && sudo make install && \
-    cd .. && rm -rf openssl-$VERS.tar.gz openssl-$VERS
+    cd .. && rm -rf openssl-$VERS.tar.gz openssl-$VERS && \
+    echo "Building zlib" && \
+    VERS=1.2.11 && \
+    cd /home/rust/libs && \
+    curl -LO http://zlib.net/zlib-$VERS.tar.gz && \
+    tar xzf zlib-$VERS.tar.gz && cd zlib-$VERS && \
+    CC=musl-gcc ./configure --static --prefix=/usr/local/musl && \
+    make && sudo make install && \
+    cd .. && rm -rf zlib-$VERS.tar.gz zlib-$VERS && \
+    echo "Building libpq" && \
+    VERS=9.6.5 && \
+    curl -o postgres.tar.gz https://ftp.postgresql.org/pub/source/v$VERS/postgresql-$VERS.tar.gz && \
+    tar xzf postgres.tar.gz && \
+    cd postgresql-$VERS && \
+    CC=musl-gcc CPPFLAGS=-I/usr/local/musl/include LDFLAGS=-L/usr/local/musl/lib ./configure --with-openssl --without-readline --prefix=/usr/local/musl && \
+    cd src/interfaces/libpq && \
+    make all-static-lib && sudo make install-lib-static && \
+    cd ../../../.. && rm -rf postgres.tar.gz postgresql-$VERS
+
 ENV OPENSSL_DIR=/usr/local/musl/ \
     OPENSSL_INCLUDE_DIR=/usr/local/musl/include/ \
     DEP_OPENSSL_INCLUDE=/usr/local/musl/include/ \
     OPENSSL_LIB_DIR=/usr/local/musl/lib/ \
-    OPENSSL_STATIC=1
+    OPENSSL_STATIC=1 \
+    PQ_LIB_DIR=/usr/local/musl/lib \
+    PQ_LIB_STATIC=1
 
 # (Please feel free to submit pull requests for musl-libc builds of other C
 # libraries needed by the most popular and common Rust crates, to avoid

Dockerfile.example

@@ -6,6 +6,8 @@
 FROM ekidd/rust-musl-builder
 
 # Build a static copy of zlib.
+#
+# EXAMPLE ONLY! libz is already included.
 RUN VERS=1.2.11 && \
     cd /home/rust/libs && \
     curl -LO http://zlib.net/zlib-$VERS.tar.gz && \

README.md

@@ -32,6 +32,10 @@ libraries:
 
 - The standard `musl-libc` libraries.
 - OpenSSL, which is needed by many Rust applications.
+- `libpq`, which is needed for applications that use `diesel` with PostgreSQL.
+- `libz`, which is needed by `libpq`.
+
+This library also sets up the environment variables needed to compile popular Rust crates using these libraries.
 
 ## Making OpenSSL work
 
@@ -55,7 +59,8 @@ installed, you can create a Dockerfile based on this one, and use
 ```Dockerfile
 FROM ekidd/rust-musl-builder
 
-RUN VERS=1.2.8 && \
+# EXAMPLE ONLY! libz is already included.
+RUN VERS=1.2.11 && \
     cd /home/rust/libs && \
     curl -LO http://zlib.net/zlib-$VERS.tar.gz && \
     tar xzf zlib-$VERS.tar.gz && cd zlib-$VERS && \
@@ -111,27 +116,17 @@ build new Linux binaries using `rust-musl-builder`, and new Mac binaries
 with Cargo, and it will upload both to the GitHub releases page for your
 repository.
 
-For a working example, see [faradayio/conductor][conductor].
+For a working example, see [faradayio/cage][cage].
 
 [rust-cross]: https://github.com/japaric/rust-cross
 [uploading]: https://docs.travis-ci.com/user/deployment/releases
-[conductor]: https://github.com/faradayio/conductor
+[cage]: https://github.com/faradayio/cage
 
 ## Development notes
 
 After modifying the image, run `./test-image` to make sure that everything
 works.
 
-MAINTAINERS ONLY: After making changes, they must be pushed to the `stable`
-branch to build the official `stable` and `latest` images on Docker Hub.
-Tagged versions of Rust (such as `1.11`) must be given their own branches
-and manually configured on Docker Hub.
-
-```sh
-git push origin master:stable
-git push origin master:rust-$(rustc --version | awk '{ print $2 }')
-```
-
 ## License
 
 Either the [Apache 2.0 license](./LICENSE-APACHE.txt), or the