Fix travis builds

After reading some articles [1] [2] yesterday about Docker and the "init"
process I got to thinking about the problems that we've been seeing on Travis.
The basic problem is that a Linux system may need an "init" process to work
properly when processes become zombies. Docker by default doesn't handle this
and the root process typically isn't an init process, so this can occasionally
cause quite a few problems.

We've been seeing spurious errors on Travis inside containers which look like
OOM and such, but my guess is that zombie processes were being reparented to the
top-level shell. The shell didn't expect the zombies and then behaved very
strangely.

This commit fixes these problems by using Yelp's "dumb-init" program [2] as the
init process in all of our containers. This ensures that there's a valid init
ready to reap children when they're reparented, which our test suite apparently
generates a bunch of throughout the tests and such.

[1]: https://blog.phusion.nl/2015/01/20/docker-and-the-pid-1-zombie-reaping-problem/
[2]: https://engineeringblog.yelp.com/2016/01/dumb-init-an-init-for-docker.html

12 files changed, 61 insertions, 1 deletions

diff --git a/src/ci/docker/arm-android/Dockerfile b/src/ci/docker/arm-android/Dockerfile
index 121c0263cbc..5489fb7304d 100644
--- a/src/ci/docker/arm-android/Dockerfile
+++ b/src/ci/docker/arm-android/Dockerfile
@@ -25,8 +25,13 @@ COPY install-ndk.sh install-sdk.sh accept-licenses.sh /android/
 RUN sh /android/install-ndk.sh
 RUN sh /android/install-sdk.sh
 
+RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
+    dpkg -i dumb-init_*.deb && \
+    rm dumb-init_*.deb
+
 COPY start-emulator.sh /android/
-ENTRYPOINT ["/android/start-emulator.sh"]
+
+ENTRYPOINT ["/usr/bin/dumb-init", "--", "/android/start-emulator.sh"]
 
 ENV TARGETS=arm-linux-androideabi
 ENV TARGETS=$TARGETS,i686-linux-android
diff --git a/src/ci/docker/cross/Dockerfile b/src/ci/docker/cross/Dockerfile
index b7b23d74c9d..eeb6c79d69b 100644
--- a/src/ci/docker/cross/Dockerfile
+++ b/src/ci/docker/cross/Dockerfile
@@ -23,6 +23,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   gcc-powerpc64le-linux-gnu libc6-dev-ppc64el-cross \
   gcc-s390x-linux-gnu libc6-dev-s390x-cross
 
+RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
+    dpkg -i dumb-init_*.deb && \
+    rm dumb-init_*.deb
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+
 ENV TARGETS=aarch64-unknown-linux-gnu
 ENV TARGETS=$TARGETS,arm-unknown-linux-gnueabi
 ENV TARGETS=$TARGETS,arm-unknown-linux-gnueabihf
diff --git a/src/ci/docker/i686-gnu-nopt/Dockerfile b/src/ci/docker/i686-gnu-nopt/Dockerfile
index a9ef29daaf1..51161997e22 100644
--- a/src/ci/docker/i686-gnu-nopt/Dockerfile
+++ b/src/ci/docker/i686-gnu-nopt/Dockerfile
@@ -13,6 +13,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   sudo \
   gdb
 
+RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
+    dpkg -i dumb-init_*.deb && \
+    rm dumb-init_*.deb
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+
 ENV RUST_CONFIGURE_ARGS --build=i686-unknown-linux-gnu --disable-optimize-tests
 ENV RUST_CHECK_TARGET check
 RUN mkdir /tmp/obj
diff --git a/src/ci/docker/i686-gnu/Dockerfile b/src/ci/docker/i686-gnu/Dockerfile
index d0ddde95b44..1603d353275 100644
--- a/src/ci/docker/i686-gnu/Dockerfile
+++ b/src/ci/docker/i686-gnu/Dockerfile
@@ -13,6 +13,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   sudo \
   gdb
 
+RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
+    dpkg -i dumb-init_*.deb && \
+    rm dumb-init_*.deb
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+
 ENV RUST_CONFIGURE_ARGS --build=i686-unknown-linux-gnu
 ENV RUST_CHECK_TARGET check
 RUN mkdir /tmp/obj
diff --git a/src/ci/docker/x86_64-freebsd/Dockerfile b/src/ci/docker/x86_64-freebsd/Dockerfile
index a3a52f9e6ff..629cfbc3a9c 100644
--- a/src/ci/docker/x86_64-freebsd/Dockerfile
+++ b/src/ci/docker/x86_64-freebsd/Dockerfile
@@ -18,6 +18,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 COPY build-toolchain.sh /tmp/
 RUN sh /tmp/build-toolchain.sh
 
+RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
+    dpkg -i dumb-init_*.deb && \
+    rm dumb-init_*.deb
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+
 ENV \
     AR_x86_64_unknown_freebsd=x86_64-unknown-freebsd10-ar \
     CC_x86_64_unknown_freebsd=x86_64-unknown-freebsd10-gcc
diff --git a/src/ci/docker/x86_64-gnu-cargotest/Dockerfile b/src/ci/docker/x86_64-gnu-cargotest/Dockerfile
index 107e2bf8a12..78aa510ec04 100644
--- a/src/ci/docker/x86_64-gnu-cargotest/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-cargotest/Dockerfile
@@ -13,6 +13,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   libssl-dev \
   sudo
 
+RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
+    dpkg -i dumb-init_*.deb && \
+    rm dumb-init_*.deb
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+
 ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu
 ENV RUST_CHECK_TARGET check-cargotest
 ENV NO_VENDOR 1
diff --git a/src/ci/docker/x86_64-gnu-debug/Dockerfile b/src/ci/docker/x86_64-gnu-debug/Dockerfile
index 9e98215775e..7d00f11cbb8 100644
--- a/src/ci/docker/x86_64-gnu-debug/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-debug/Dockerfile
@@ -13,6 +13,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   sudo \
   gdb
 
+RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
+    dpkg -i dumb-init_*.deb && \
+    rm dumb-init_*.deb
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+
 ENV RUST_CONFIGURE_ARGS \
       --build=x86_64-unknown-linux-gnu \
       --enable-debug \
diff --git a/src/ci/docker/x86_64-gnu-llvm-3.7/Dockerfile b/src/ci/docker/x86_64-gnu-llvm-3.7/Dockerfile
index c27e3d1325f..95484c660e6 100644
--- a/src/ci/docker/x86_64-gnu-llvm-3.7/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-llvm-3.7/Dockerfile
@@ -16,6 +16,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   libedit-dev \
   zlib1g-dev
 
+RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
+    dpkg -i dumb-init_*.deb && \
+    rm dumb-init_*.deb
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+
 ENV RUST_CONFIGURE_ARGS \
       --build=x86_64-unknown-linux-gnu \
       --llvm-root=/usr/lib/llvm-3.7
diff --git a/src/ci/docker/x86_64-gnu-make/Dockerfile b/src/ci/docker/x86_64-gnu-make/Dockerfile
index 93229b2a010..4a5c5b57ea7 100644
--- a/src/ci/docker/x86_64-gnu-make/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-make/Dockerfile
@@ -13,6 +13,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   sudo \
   gdb
 
+RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
+    dpkg -i dumb-init_*.deb && \
+    rm dumb-init_*.deb
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+
 ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu --disable-rustbuild
 ENV RUST_CHECK_TARGET check
 RUN mkdir /tmp/obj
diff --git a/src/ci/docker/x86_64-gnu-nopt/Dockerfile b/src/ci/docker/x86_64-gnu-nopt/Dockerfile
index 73a3e2c726c..c2a5449d2e3 100644
--- a/src/ci/docker/x86_64-gnu-nopt/Dockerfile
+++ b/src/ci/docker/x86_64-gnu-nopt/Dockerfile
@@ -13,6 +13,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   sudo \
   gdb
 
+RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
+    dpkg -i dumb-init_*.deb && \
+    rm dumb-init_*.deb
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+
 ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu --disable-optimize-tests
 ENV RUST_CHECK_TARGET check
 RUN mkdir /tmp/obj
diff --git a/src/ci/docker/x86_64-gnu/Dockerfile b/src/ci/docker/x86_64-gnu/Dockerfile
index f125693e7ae..54bbc9b3421 100644
--- a/src/ci/docker/x86_64-gnu/Dockerfile
+++ b/src/ci/docker/x86_64-gnu/Dockerfile
@@ -13,6 +13,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   sudo \
   gdb
 
+RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
+    dpkg -i dumb-init_*.deb && \
+    rm dumb-init_*.deb
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+
 ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu
 ENV RUST_CHECK_TARGET check
 RUN mkdir /tmp/obj
diff --git a/src/ci/docker/x86_64-musl/Dockerfile b/src/ci/docker/x86_64-musl/Dockerfile
index 967940fb1f3..b3068cacd04 100644
--- a/src/ci/docker/x86_64-musl/Dockerfile
+++ b/src/ci/docker/x86_64-musl/Dockerfile
@@ -18,6 +18,11 @@ WORKDIR /build/
 COPY build-musl.sh /build/
 RUN sh /build/build-musl.sh && rm -rf /build
 
+RUN curl -OL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb && \
+    dpkg -i dumb-init_*.deb && \
+    rm dumb-init_*.deb
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+
 ENV RUST_CONFIGURE_ARGS \
       --target=x86_64-unknown-linux-musl \
       --musl-root-x86_64=/musl-x86_64