x86_64-linux-gnu: set centos as the base image

build the debian sysroot (linux-image.sh) in a ubuntu container

.gitignore

@@ -1 +1,2 @@
 target
+/docker/qemu

build-docker-image.sh

@@ -18,6 +18,21 @@ run() {
     fi
   fi
 
+  if grep -i centos "${dockerfile}" >/dev/null 2>/dev/null; then
+      # build debian sysroot in a separate ubuntu container
+      # (only done for x86-linux-gnu ATM)
+      rm -rf qemu
+      mkdir qemu
+      cp linux-image.sh qemu/
+      docker run \
+        --rm \
+        -v "$(pwd)/qemu:/qemu:z" \
+        -w /qemu \
+        -i \
+        -t "ubuntu:16.04" \
+        sh -c "./linux-image.sh x86_64; chown -R $(id -u):$(id -g) /qemu"
+  fi
+
   docker build ${cache_from_args[@]+"${cache_from_args[@]}"} --pull -t "${image_name}" -f "${dockerfile}" .
 
   if ! [[ "${version}" =~ alpha ]] && ! [[ "${version}" =~ dev ]]; then

docker/Dockerfile.x86_64-unknown-linux-gnu

@@ -0,0 +1,23 @@
+FROM centos:7
+
+COPY common.sh lib.sh /
+RUN /common.sh
+
+COPY cmake.sh /
+RUN /cmake.sh
+
+COPY xargo.sh /
+RUN /xargo.sh
+
+COPY qemu.sh /
+RUN /qemu.sh x86_64 softmmu
+
+COPY dropbear.sh /
+RUN /dropbear.sh
+
+# this folder is built by `build-docker-image.sh`
+COPY qemu /qemu
+
+COPY linux-runner /
+
+ENV CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUNNER="/linux-runner x86_64"

docker/linux-image.sh

@@ -92,6 +92,8 @@ main() {
     esac
 
     local dependencies=(
+        ca-certificates
+        curl
         cpio
         sharutils
         gnupg
@@ -100,7 +102,7 @@ main() {
     local purge_list=()
     apt-get update
     for dep in "${dependencies[@]}"; do
-        if ! dpkg -L "${dep}"; then
+        if ! dpkg -L "${dep}" >/dev/null 2>/dev/null; then
             apt-get install --assume-yes --no-install-recommends "${dep}"
             purge_list+=( "${dep}" )
         fi