Add a disabled builder for aarch64 emulated tests

This commit adds a disabled builder which will run all tests for the standard
library for aarch64 in a QEMU instance. Once we get enough capacity to run this
on Travis this can be used to boost our platform coverage of AArch64

2 files changed, 71 insertions, 0 deletions

diff --git a/src/ci/docker/scripts/qemu-bare-bones-addentropy.c b/src/ci/docker/scripts/qemu-bare-bones-addentropy.c
new file mode 100644
index 00000000000..8975739e3c0
--- /dev/null
+++ b/src/ci/docker/scripts/qemu-bare-bones-addentropy.c
@@ -0,0 +1,43 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#include <assert.h>
+#include <stdint.h>
+#include <sys/ioctl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <linux/random.h>
+
+#define N 2048
+
+struct entropy {
+  int ent_count;
+  int size;
+  unsigned char data[N];
+};
+
+int main() {
+  struct entropy buf;
+  ssize_t n;
+
+  int random_fd = open("/dev/random", O_RDWR);
+  assert(random_fd >= 0);
+
+  while ((n = read(0, &buf.data, N)) > 0) {
+    buf.ent_count = n * 8;
+    buf.size = n;
+    if (ioctl(random_fd, RNDADDENTROPY, &buf) != 0) {
+      perror("failed to add entropy");
+    }
+  }
+
+  return 0;
+}
diff --git a/src/ci/docker/scripts/qemu-bare-bones-rcS b/src/ci/docker/scripts/qemu-bare-bones-rcS
new file mode 100644
index 00000000000..3c29bedc13c
--- /dev/null
+++ b/src/ci/docker/scripts/qemu-bare-bones-rcS
@@ -0,0 +1,28 @@
+#!/bin/sh
+mount -t proc none /proc
+mount -t sysfs none /sys
+/sbin/mdev -s
+
+# fill up our entropy pool, if we don't do this then anything with a hash map
+# will likely block forever as the kernel is pretty unlikely to have enough
+# entropy.
+/addentropy < /addentropy
+cat /dev/urandom | head -n 2048 | /addentropy
+
+# Set up IP that qemu expects. This confgures eth0 with the public IP that QEMU
+# will communicate to as well as the loopback 127.0.0.1 address.
+ifconfig eth0 10.0.2.15
+ifconfig lo up
+
+# Configure DNS resolution of 'localhost' to work
+echo 'hosts:      files dns' >> /ubuntu/etc/nsswitch.conf
+echo '127.0.0.1    localhost' >> /ubuntu/etc/hosts
+
+# prepare the chroot
+mount -t proc proc /ubuntu/proc/
+mount --rbind /sys /ubuntu/sys/
+mount --rbind /dev /ubuntu/dev/
+
+# Execute our `testd` inside the ubuntu chroot
+cp /testd /ubuntu/testd
+chroot /ubuntu /testd &