Docker-Based Developer Resource (#5871)

* add docker-based development resources

* incorporate feedback from @ax3l

* fix docs/improve ssh handling

* experiment with custom prompt

* add arch/fix missing core_compilers key

* add centos/minor tweaks

* make prompt experiment optional

* workaround problem with latest fedora docker image

* add docker documentation page to index toc

* try another documentation fix

* switch arch linux base to base/archlinux

* update the git urls in the Dockerfiles

* add opensuse

* switch CUSTOM_PROMPT variable to simply "PROMPT"

25 files changed, 1308 insertions, 0 deletions

diff --git a/lib/spack/docs/docker_for_developers.rst b/lib/spack/docs/docker_for_developers.rst
new file mode 100644
index 0000000000..cb08b7503e
--- /dev/null
+++ b/lib/spack/docs/docker_for_developers.rst
@@ -0,0 +1,39 @@
+.. _docker_for_developers:
+
+=====================
+Docker for Developers
+=====================
+
+This guide is intended for people who want to use our prepared docker
+environments to work on developing Spack or working on spack packages. It is
+meant to serve as the companion documentation for the :ref:`packaging-guide`.
+
+--------
+Overview
+--------
+
+To get started, all you need is the latest version of ``docker`` and
+``docker-compose``.
+
+.. code-block:: console
+
+    $ cd share/spack/docker
+    $ docker-compose run --rm ubuntu
+
+This command should drop you into an interactive shell where you can run spack
+within an isolated docker container running ubuntu.  The copy of spack being
+used should be tied to the working copy of your cloned git repo, so any changes
+you make should be immediately reflected in the running docker container.  Feel
+free to add or modify any packages or to hack on spack, itself.  Your contained
+copy of spack should immediately reflect all changes.
+
+To work within a container running a different linux distro, change the "ubuntu"
+argument to any one of the services listed under the ``docker-compose.yml``
+file.
+
+.. code-block:: console
+
+    $ docker-compose config --services
+    fedora
+    ubuntu
+    $ docker-compose run --rm fedora
diff --git a/lib/spack/docs/index.rst b/lib/spack/docs/index.rst
index 2ca737bb72..ea80e2c21e 100644
--- a/lib/spack/docs/index.rst
+++ b/lib/spack/docs/index.rst
@@ -74,6 +74,7 @@ or refer to the full manual below.
    contribution_guide
    packaging_guide
    developer_guide
+   docker_for_developers
    Spack API Docs <spack>
    LLNL API Docs <llnl>
 
diff --git a/lib/spack/docs/workflows.rst b/lib/spack/docs/workflows.rst
index 4c674f92e4..0d8ffb7a14 100644
--- a/lib/spack/docs/workflows.rst
+++ b/lib/spack/docs/workflows.rst
@@ -1254,6 +1254,28 @@ Just use the `docker bootstraping mechanism <http://singularity.lbl.gov/quicksta
    %runscript
    exec /bin/bash -l
 
+""""""""""""""""""""""
+Docker for Development
+""""""""""""""""""""""
+
+For examples of how we use docker in development, see
+:ref:`docker_for_developers`.
+
+"""""""""""""""""""""""""
+Docker on Windows and OSX
+"""""""""""""""""""""""""
+
+On Mac OS and Windows, docker runs on a hypervisor that is not allocated much
+memory by default, and some spack packages may fail to build due to lack of
+memory. To work around this issue, consider configuring your docker installation
+to use more of your host memory. In some cases, you can also ease the memory
+pressure on parallel builds by limiting the parallelism in your config.yaml.
+
+.. code-block:: yaml
+
+   config:
+     build_jobs: 2
+
 ------------------
 Upstream Bug Fixes
 ------------------
diff --git a/share/spack/docker/.env b/share/spack/docker/.env
new file mode 100644
index 0000000000..924ceb3f73
--- /dev/null
+++ b/share/spack/docker/.env
@@ -0,0 +1 @@
+COMPOSE_PROJECT_NAME=spack
diff --git a/share/spack/docker/docker-compose.yml b/share/spack/docker/docker-compose.yml
new file mode 100644
index 0000000000..f050a86700
--- /dev/null
+++ b/share/spack/docker/docker-compose.yml
@@ -0,0 +1,32 @@
+version: '3'
+services:
+  arch:
+    build: ./spack_arch
+    volumes:
+      - '../../..:/spack'
+    environment:
+      PROMPT: "${PROMPT:-0}"
+  centos:
+    build: ./spack_centos
+    volumes:
+      - '../../..:/spack'
+    environment:
+      PROMPT: "${PROMPT:-0}"
+  fedora:
+    build: ./spack_fedora
+    volumes:
+      - '../../..:/spack'
+    environment:
+      PROMPT: "${PROMPT:-0}"
+  opensuse:
+    build: ./spack_opensuse
+    volumes:
+      - '../../..:/spack'
+    environment:
+      PROMPT: "${PROMPT:-0}"
+  ubuntu:
+    build: ./spack_ubuntu
+    volumes:
+      - '../../..:/spack'
+    environment:
+      PROMPT: "${PROMPT:-0}"
diff --git a/share/spack/docker/spack_arch/Dockerfile b/share/spack/docker/spack_arch/Dockerfile
new file mode 100644
index 0000000000..973b16f125
--- /dev/null
+++ b/share/spack/docker/spack_arch/Dockerfile
@@ -0,0 +1,59 @@
+FROM base/archlinux
+MAINTAINER Omar Padron <omar.padron@kitware.com>
+
+ENV SPACK_ROOT=/spack        \
+    FORCE_UNSAFE_CONFIGURE=1 \
+    DISTRO=arch
+
+RUN pacman -Sy --noconfirm  \
+        base-devel          \
+        ca-certificates     \
+        curl                \
+        gcc                 \
+        gcc-fortran         \
+        git                 \
+        gnupg2              \
+        iproute2            \
+        make                \
+        openssh             \
+        python              \
+        sudo                \
+        tcl              && \
+    git clone --depth 1 git://github.com/spack/spack.git /spack             && \
+    echo 'nobody ALL=(ALL) NOPASSWD: ALL' > /etc/sudoers.d/nobody-sudo      && \
+    sudo -u nobody git clone --depth 1                                         \
+        https://aur.archlinux.org/lua-posix.git /tmp/lua-posix              && \
+    sudo -u nobody git clone --depth 1                                         \
+        https://aur.archlinux.org/lmod.git /tmp/lmod                        && \
+    ( cd /tmp/lua-posix ; sudo -u nobody makepkg -si --asdeps --noconfirm ) && \
+    ( cd /tmp/lmod      ; sudo -u nobody makepkg -si          --noconfirm ) && \
+    rm -rf /tmp/lua-posix /tmp/lmod /spack/.git /etc/sudoers.d/nobody-sudo
+
+RUN ( cd /usr/share/lmod ; ln -s $( ls -d ./* | head -n 1 ) ./lmod )
+
+RUN echo "source /usr/share/lmod/lmod/init/bash" \
+    > /etc/profile.d/spack.sh
+RUN echo "source /spack/share/spack/setup-env.sh" \
+    >> /etc/profile.d/spack.sh
+RUN echo "source /spack/share/spack/spack-completion.bash" \
+    >> /etc/profile.d/spack.sh
+
+COPY handle-ssh.sh /etc/profile.d/handle-ssh.sh
+COPY handle-prompt.sh /etc/profile.d/handle-prompt.sh.source
+
+RUN (                                                         \
+    echo "export DISTRO=$DISTRO"                            ; \
+    echo "if [ x\$PROMPT '!=' 'x' -a x\$PROMPT '!=' 'x0' ]" ; \
+    echo "then"                                             ; \
+    echo "source /etc/profile.d/handle-prompt.sh.source"    ; \
+    echo "fi"                                               ; \
+) > /etc/profile.d/handle-prompt.sh
+
+RUN mkdir -p /root/.spack
+COPY modules.yaml /root/.spack/modules.yaml
+
+RUN rm -rf /root/*.*
+
+WORKDIR /root
+ENTRYPOINT ["bash"]
+CMD ["-l"]
diff --git a/share/spack/docker/spack_arch/handle-prompt.sh b/share/spack/docker/spack_arch/handle-prompt.sh
new file mode 100644
index 0000000000..bf62224a60
--- /dev/null
+++ b/share/spack/docker/spack_arch/handle-prompt.sh
@@ -0,0 +1,143 @@
+__tmp="`mktemp -d`"
+
+__trylock() {
+    local dir
+    dir="$__tmp/$1.lock"
+    mkdir "$dir" &>/dev/null
+    return $?
+}
+
+__queue_init() {
+    local r
+    local w
+
+    mkdir "$__tmp/$1.read.lock" ; r=$?
+    mkdir "$__tmp/$1.write.lock" ; w=$?
+
+    if [ "$r" '=' '0' -a "$w" '=' '0' ] ; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+__queue_try_read() {
+    __trylock "$1.read"
+    return $?
+}
+
+__queue_try_write() {
+    __trylock "$1.write"
+    return $?
+}
+
+__queue_make_readable() {
+    rm -r "$__tmp/$1.read.lock" &>/dev/null
+    return $?
+}
+
+__queue_make_writable() {
+    rm -r "$__tmp/$1.write.lock" &>/dev/null
+    return $?
+}
+
+__read() {
+    cat "$__tmp/$1" 2> /dev/null
+    return $?
+}
+
+__write() {
+    cat > "$__tmp/$1" 2> /dev/null
+    return $?
+}
+
+__update_prompt() {
+    local prompt
+    prompt=''
+    linux_distro="$DISTRO"
+    if [ -n "$linux_distro" ] ; then
+        linux_distro='\[\e[1;34m\][\[\e[0;34m\]'"$linux_distro"'\[\e[1;34m\]]'
+        if [ -n "$prompt" ] ; then
+            prompt="$prompt "
+        fi
+        prompt="$prompt$linux_distro"
+    fi
+
+    git_head="`git -C /spack rev-parse --abbrev-ref HEAD 2>/dev/null`"
+    if [ "$?" '=' '0' ] ; then
+        if [ "$git_head" '=' 'HEAD' ] ; then
+            git_head="`git -C /spack rev-parse HEAD 2>/dev/null | cut -c1-8`..."
+        fi
+    else
+        git_head=''
+    fi
+
+    if [ -n "$git_head" ] ; then
+        git_head='\[\e[1;32m\](\[\e[0;32m\]'"$git_head"'\[\e[1;32m\])'
+        if [ -n "$prompt" ] ; then
+            prompt="$prompt "
+        fi
+        prompt="$prompt$git_head"
+    fi
+
+    if [ -n "$prompt" ] ; then
+        prompt="$prompt "
+    fi
+    prompt="$prompt"'\[\e[0;m\]\W: '
+    echo "$prompt" | __write prompt
+}
+
+set -m
+(
+    __queue_init query
+    __queue_init prompt
+
+    __update_prompt
+    __queue_make_readable prompt
+
+    __queue_make_writable query
+
+    while sleep 0.010 ; do
+        last_q_time=''
+
+        while sleep 0.010 ; do
+            q_time="`date +%s%N`"
+            if __queue_try_read query ; then
+                last_q_time="$q_time"
+                __queue_make_writable query
+            fi
+
+            if [ -n "$last_q_time" -a \
+                "$(( (q_time - last_q_time)/10000000 > 100 ))" '=' '1' ] ; then
+                break
+            fi
+        done
+
+        __update_prompt
+        __queue_make_readable prompt
+    done
+) &>/dev/null &
+set +m
+
+__update_prompt_main_first_call=1
+__update_prompt_main() {
+    if [ "$__update_prompt_main_first_call" '=' '1' ] ; then
+        while sleep 0.001 ; do
+            if __queue_try_read prompt ; then
+                PS1="`__read prompt`"
+                break
+            fi
+        done
+        __update_prompt_main_first_call=0
+    else
+        if __queue_try_read prompt ; then
+            PS1="`__read prompt`"
+        fi
+    fi
+
+    if __queue_try_write query ; then
+        __queue_make_readable query
+    fi
+}
+
+PROMPT_COMMAND=__update_prompt_main
diff --git a/share/spack/docker/spack_arch/handle-ssh.sh b/share/spack/docker/spack_arch/handle-ssh.sh
new file mode 100644
index 0000000000..f13c10e212
--- /dev/null
+++ b/share/spack/docker/spack_arch/handle-ssh.sh
@@ -0,0 +1,36 @@
+uid="`id -u`"
+if [ "$uid" '=' '0' ] ; then
+    for key_type in dsa ecdsa ed25519 rsa ; do
+        private_key_file="/etc/ssh/ssh_host_${key_type}_key"
+        public_key_file="$private_key_file.pub"
+
+        if [ '!' -f "$private_key_file" ] ; then
+            ssh-keygen \
+                -q -t "$key_type" -N "" -f "$private_key_file"
+            chmod 600 "$private_key_file"
+            chmod 644 "$public_key_file"
+        fi
+    done
+
+    mkdir -p /var/run/sshd
+
+    pgrep -u 0 -U 0 sshd &> /dev/null
+    if [ '!' "$?" '=' '0' ] ; then
+        nohup /usr/sbin/sshd -f /etc/ssh/sshd_config < /dev/null &> /dev/null
+    fi
+fi
+
+if [ '!' -f "$HOME/.ssh/id_rsa" ] ; then
+    ssh-keygen \
+        -t rsa -C "spack.developer@docker.host" -N "" -f "$HOME/.ssh/id_rsa"
+    cat "$HOME/.ssh/id_rsa.pub" >> "$HOME/.ssh/authorized_keys"
+    chmod 600 "$HOME/.ssh/authorized_keys"
+
+    docker_ip="`ip address show dev eth0 |
+                grep inet |
+                cut -d' ' -f 6 |
+                cut -d/ -f 1`"
+
+    ssh-keyscan -t rsa 127.0.0.1 localhost "$docker_ip" "`hostname`" \
+        > "$HOME/.ssh/known_hosts" 2> /dev/null
+fi
diff --git a/share/spack/docker/spack_arch/modules.yaml b/share/spack/docker/spack_arch/modules.yaml
new file mode 100644
index 0000000000..02907ecc40
--- /dev/null
+++ b/share/spack/docker/spack_arch/modules.yaml
@@ -0,0 +1,6 @@
+modules:
+  enable:
+    - lmod
+  lmod:
+    core_compilers:
+      - gcc
diff --git a/share/spack/docker/spack_centos/Dockerfile b/share/spack/docker/spack_centos/Dockerfile
new file mode 100644
index 0000000000..a1069128f5
--- /dev/null
+++ b/share/spack/docker/spack_centos/Dockerfile
@@ -0,0 +1,57 @@
+FROM centos
+MAINTAINER Omar Padron <omar.padron@kitware.com>
+
+ENV SPACK_ROOT=/spack        \
+    FORCE_UNSAFE_CONFIGURE=1 \
+    DISTRO=centos
+
+RUN yum update -y               && \
+    yum install -y epel-release && \
+    yum update -y               && \
+    yum groupinstall -y "Development Tools" && \
+    yum install -y            \
+        curl                  \
+        findutils             \
+        gcc-c++               \
+        gcc                   \
+        gcc-gfortran          \
+        git                   \
+        gnupg2                \
+        hostname              \
+        iproute               \
+        Lmod                  \
+        make                  \
+        patch                 \
+        openssh-server        \
+        python                \
+        tcl                && \
+    git clone --depth 1 git://github.com/spack/spack.git /spack && \
+    rm -rf /spack/.git /var/cache/yum && yum clean all
+
+RUN echo "source /usr/share/lmod/lmod/init/bash" \
+    > /etc/profile.d/spack.sh
+RUN echo "source /spack/share/spack/setup-env.sh" \
+    >> /etc/profile.d/spack.sh
+RUN echo "source /spack/share/spack/spack-completion.bash" \
+    >> /etc/profile.d/spack.sh
+COPY handle-ssh.sh /etc/profile.d/handle-ssh.sh
+COPY handle-prompt.sh /etc/profile.d/handle-prompt.sh.source
+
+RUN (                                                         \
+    echo "export DISTRO=$DISTRO"                            ; \
+    echo "if [ x\$PROMPT '!=' 'x' -a x\$PROMPT '!=' 'x0' ]" ; \
+    echo "then"                                             ; \
+    echo "source /etc/profile.d/handle-prompt.sh.source"    ; \
+    echo "fi"                                               ; \
+) > /etc/profile.d/handle-prompt.sh
+
+RUN mkdir -p /root/.spack
+COPY modules.yaml /root/.spack/modules.yaml
+
+RUN rm -f /run/nologin
+
+RUN rm -rf /root/*.*
+
+WORKDIR /root
+ENTRYPOINT ["bash"]
+CMD ["-l"]
diff --git a/share/spack/docker/spack_centos/handle-prompt.sh b/share/spack/docker/spack_centos/handle-prompt.sh
new file mode 100644
index 0000000000..15ef53e316
--- /dev/null
+++ b/share/spack/docker/spack_centos/handle-prompt.sh
@@ -0,0 +1,143 @@
+__tmp="`mktemp -d`"
+
+__trylock() {
+    local dir
+    dir="$__tmp/$1.lock"
+    mkdir "$dir" &>/dev/null
+    return $?
+}
+
+__queue_init() {
+    local r
+    local w
+
+    mkdir "$__tmp/$1.read.lock" ; r=$?
+    mkdir "$__tmp/$1.write.lock" ; w=$?
+
+    if [ "$r" '=' '0' -a "$w" '=' '0' ] ; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+__queue_try_read() {
+    __trylock "$1.read"
+    return $?
+}
+
+__queue_try_write() {
+    __trylock "$1.write"
+    return $?
+}
+
+__queue_make_readable() {
+    rm -r "$__tmp/$1.read.lock" &>/dev/null
+    return $?
+}
+
+__queue_make_writable() {
+    rm -r "$__tmp/$1.write.lock" &>/dev/null
+    return $?
+}
+
+__read() {
+    cat "$__tmp/$1" 2> /dev/null
+    return $?
+}
+
+__write() {
+    cat > "$__tmp/$1" 2> /dev/null
+    return $?
+}
+
+__update_prompt() {
+    local prompt
+    prompt=''
+    linux_distro="$DISTRO"
+    if [ -n "$linux_distro" ] ; then
+        linux_distro='\[\e[1;34m\][\[\e[0;34m\]'"$linux_distro"'\[\e[1;34m\]]'
+        if [ -n "$prompt" ] ; then
+            prompt="$prompt "
+        fi
+        prompt="$prompt$linux_distro"
+    fi
+
+    git_head="`git --git-dir=/spack/.git --work-tree=/spack rev-parse --abbrev-ref HEAD 2>/dev/null`"
+    if [ "$?" '=' '0' ] ; then
+        if [ "$git_head" '=' 'HEAD' ] ; then
+            git_head="`git --git-dir=/spack/.git --work-tree=/spack rev-parse HEAD 2>/dev/null | cut -c1-8`..."
+        fi
+    else
+        git_head=''
+    fi
+
+    if [ -n "$git_head" ] ; then
+        git_head='\[\e[1;32m\](\[\e[0;32m\]'"$git_head"'\[\e[1;32m\])'
+        if [ -n "$prompt" ] ; then
+            prompt="$prompt "
+        fi
+        prompt="$prompt$git_head"
+    fi
+
+    if [ -n "$prompt" ] ; then
+        prompt="$prompt "
+    fi
+    prompt="$prompt"'\[\e[0;m\]\W: '
+    echo "$prompt" | __write prompt
+}
+
+set -m
+(
+    __queue_init query
+    __queue_init prompt
+
+    __update_prompt
+    __queue_make_readable prompt
+
+    __queue_make_writable query
+
+    while sleep 0.010 ; do
+        last_q_time=''
+
+        while sleep 0.010 ; do
+            q_time="`date +%s%N`"
+            if __queue_try_read query ; then
+                last_q_time="$q_time"
+                __queue_make_writable query
+            fi
+
+            if [ -n "$last_q_time" -a \
+                "$(( (q_time - last_q_time)/10000000 > 100 ))" '=' '1' ] ; then
+                break
+            fi
+        done
+
+        __update_prompt
+        __queue_make_readable prompt
+    done
+) &>/dev/null &
+set +m
+
+__update_prompt_main_first_call=1
+__update_prompt_main() {
+    if [ "$__update_prompt_main_first_call" '=' '1' ] ; then
+        while sleep 0.001 ; do
+            if __queue_try_read prompt ; then
+                PS1="`__read prompt`"
+                break
+            fi
+        done
+        __update_prompt_main_first_call=0
+    else
+        if __queue_try_read prompt ; then
+            PS1="`__read prompt`"
+        fi
+    fi
+
+    if __queue_try_write query ; then
+        __queue_make_readable query
+    fi
+}
+
+PROMPT_COMMAND=__update_prompt_main
diff --git a/share/spack/docker/spack_centos/handle-ssh.sh b/share/spack/docker/spack_centos/handle-ssh.sh
new file mode 100644
index 0000000000..f13c10e212
--- /dev/null
+++ b/share/spack/docker/spack_centos/handle-ssh.sh
@@ -0,0 +1,36 @@
+uid="`id -u`"
+if [ "$uid" '=' '0' ] ; then
+    for key_type in dsa ecdsa ed25519 rsa ; do
+        private_key_file="/etc/ssh/ssh_host_${key_type}_key"
+        public_key_file="$private_key_file.pub"
+
+        if [ '!' -f "$private_key_file" ] ; then
+            ssh-keygen \
+                -q -t "$key_type" -N "" -f "$private_key_file"
+            chmod 600 "$private_key_file"
+            chmod 644 "$public_key_file"
+        fi
+    done
+
+    mkdir -p /var/run/sshd
+
+    pgrep -u 0 -U 0 sshd &> /dev/null
+    if [ '!' "$?" '=' '0' ] ; then
+        nohup /usr/sbin/sshd -f /etc/ssh/sshd_config < /dev/null &> /dev/null
+    fi
+fi
+
+if [ '!' -f "$HOME/.ssh/id_rsa" ] ; then
+    ssh-keygen \
+        -t rsa -C "spack.developer@docker.host" -N "" -f "$HOME/.ssh/id_rsa"
+    cat "$HOME/.ssh/id_rsa.pub" >> "$HOME/.ssh/authorized_keys"
+    chmod 600 "$HOME/.ssh/authorized_keys"
+
+    docker_ip="`ip address show dev eth0 |
+                grep inet |
+                cut -d' ' -f 6 |
+                cut -d/ -f 1`"
+
+    ssh-keyscan -t rsa 127.0.0.1 localhost "$docker_ip" "`hostname`" \
+        > "$HOME/.ssh/known_hosts" 2> /dev/null
+fi
diff --git a/share/spack/docker/spack_centos/modules.yaml b/share/spack/docker/spack_centos/modules.yaml
new file mode 100644
index 0000000000..02907ecc40
--- /dev/null
+++ b/share/spack/docker/spack_centos/modules.yaml
@@ -0,0 +1,6 @@
+modules:
+  enable:
+    - lmod
+  lmod:
+    core_compilers:
+      - gcc
diff --git a/share/spack/docker/spack_fedora/Dockerfile b/share/spack/docker/spack_fedora/Dockerfile
new file mode 100644
index 0000000000..5e0d984a04
--- /dev/null
+++ b/share/spack/docker/spack_fedora/Dockerfile
@@ -0,0 +1,56 @@
+FROM fedora:24
+MAINTAINER Omar Padron <omar.padron@kitware.com>
+
+ENV SPACK_ROOT=/spack        \
+    FORCE_UNSAFE_CONFIGURE=1 \
+    DISTRO=fedora
+
+RUN dnf update -y && \
+    dnf group install -y "C Development Tools and Libraries" && \
+    dnf install -y            \
+        @development-tools    \
+        curl                  \
+        findutils             \
+        gcc-c++               \
+        gcc                   \
+        gcc-gfortran          \
+        git                   \
+        gnupg2                \
+        hostname              \
+        iproute               \
+        Lmod                  \
+        make                  \
+        patch                 \
+        openssh-server        \
+        python                \
+        tcl                && \
+    git clone --depth 1 git://github.com/spack/spack.git /spack && \
+    rm -rf /spack/.git && dnf clean all
+
+RUN echo "source /usr/share/lmod/lmod/init/bash" \
+    > /etc/profile.d/spack.sh
+RUN echo "source /spack/share/spack/setup-env.sh" \
+    >> /etc/profile.d/spack.sh
+RUN echo "source /spack/share/spack/spack-completion.bash" \
+    >> /etc/profile.d/spack.sh
+COPY handle-ssh.sh /etc/profile.d/handle-ssh.sh
+COPY handle-prompt.sh /etc/profile.d/handle-prompt.sh.source
+
+RUN (                                                         \
+    echo "export DISTRO=$DISTRO"                            ; \
+    echo "if [ x\$PROMPT '!=' 'x' -a x\$PROMPT '!=' 'x0' ]" ; \
+    echo "then"                                             ; \
+    echo "source /etc/profile.d/handle-prompt.sh.source"    ; \
+    echo "fi"                                               ; \
+) > /etc/profile.d/handle-prompt.sh
+
+RUN mkdir -p /root/.spack
+COPY modules.yaml /root/.spack/modules.yaml
+
+RUN rm -f /run/nologin
+
+RUN rm -rf /root/*.*
+
+WORKDIR /root
+ENTRYPOINT ["bash"]
+CMD ["-l"]
diff --git a/share/spack/docker/spack_fedora/handle-prompt.sh b/share/spack/docker/spack_fedora/handle-prompt.sh
new file mode 100644
index 0000000000..bf62224a60
--- /dev/null
+++ b/share/spack/docker/spack_fedora/handle-prompt.sh
@@ -0,0 +1,143 @@
+__tmp="`mktemp -d`"
+
+__trylock() {
+    local dir
+    dir="$__tmp/$1.lock"
+    mkdir "$dir" &>/dev/null
+    return $?
+}
+
+__queue_init() {
+    local r
+    local w
+
+    mkdir "$__tmp/$1.read.lock" ; r=$?
+    mkdir "$__tmp/$1.write.lock" ; w=$?
+
+    if [ "$r" '=' '0' -a "$w" '=' '0' ] ; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+__queue_try_read() {
+    __trylock "$1.read"
+    return $?
+}
+
+__queue_try_write() {
+    __trylock "$1.write"
+    return $?
+}
+
+__queue_make_readable() {
+    rm -r "$__tmp/$1.read.lock" &>/dev/null
+    return $?
+}
+
+__queue_make_writable() {
+    rm -r "$__tmp/$1.write.lock" &>/dev/null
+    return $?
+}
+
+__read() {
+    cat "$__tmp/$1" 2> /dev/null
+    return $?
+}
+
+__write() {
+    cat > "$__tmp/$1" 2> /dev/null
+    return $?
+}
+
+__update_prompt() {
+    local prompt
+    prompt=''
+    linux_distro="$DISTRO"
+    if [ -n "$linux_distro" ] ; then
+        linux_distro='\[\e[1;34m\][\[\e[0;34m\]'"$linux_distro"'\[\e[1;34m\]]'
+        if [ -n "$prompt" ] ; then
+            prompt="$prompt "
+        fi
+        prompt="$prompt$linux_distro"
+    fi
+
+    git_head="`git -C /spack rev-parse --abbrev-ref HEAD 2>/dev/null`"
+    if [ "$?" '=' '0' ] ; then
+        if [ "$git_head" '=' 'HEAD' ] ; then
+            git_head="`git -C /spack rev-parse HEAD 2>/dev/null | cut -c1-8`..."
+        fi
+    else
+        git_head=''
+    fi
+
+    if [ -n "$git_head" ] ; then
+        git_head='\[\e[1;32m\](\[\e[0;32m\]'"$git_head"'\[\e[1;32m\])'
+        if [ -n "$prompt" ] ; then
+            prompt="$prompt "
+        fi
+        prompt="$prompt$git_head"
+    fi
+
+    if [ -n "$prompt" ] ; then
+        prompt="$prompt "
+    fi
+    prompt="$prompt"'\[\e[0;m\]\W: '
+    echo "$prompt" | __write prompt
+}
+
+set -m
+(
+    __queue_init query
+    __queue_init prompt
+
+    __update_prompt
+    __queue_make_readable prompt
+
+    __queue_make_writable query
+
+    while sleep 0.010 ; do
+        last_q_time=''
+
+        while sleep 0.010 ; do
+            q_time="`date +%s%N`"
+            if __queue_try_read query ; then
+                last_q_time="$q_time"
+                __queue_make_writable query
+            fi
+
+            if [ -n "$last_q_time" -a \
+                "$(( (q_time - last_q_time)/10000000 > 100 ))" '=' '1' ] ; then
+                break
+            fi
+        done
+
+        __update_prompt
+        __queue_make_readable prompt
+    done
+) &>/dev/null &
+set +m
+
+__update_prompt_main_first_call=1
+__update_prompt_main() {
+    if [ "$__update_prompt_main_first_call" '=' '1' ] ; then
+        while sleep 0.001 ; do
+            if __queue_try_read prompt ; then
+                PS1="`__read prompt`"
+                break
+            fi
+        done
+        __update_prompt_main_first_call=0
+    else
+        if __queue_try_read prompt ; then
+            PS1="`__read prompt`"
+        fi
+    fi
+
+    if __queue_try_write query ; then
+        __queue_make_readable query
+    fi
+}
+
+PROMPT_COMMAND=__update_prompt_main
diff --git a/share/spack/docker/spack_fedora/handle-ssh.sh b/share/spack/docker/spack_fedora/handle-ssh.sh
new file mode 100644
index 0000000000..f13c10e212
--- /dev/null
+++ b/share/spack/docker/spack_fedora/handle-ssh.sh
@@ -0,0 +1,36 @@
+uid="`id -u`"
+if [ "$uid" '=' '0' ] ; then
+    for key_type in dsa ecdsa ed25519 rsa ; do
+        private_key_file="/etc/ssh/ssh_host_${key_type}_key"
+        public_key_file="$private_key_file.pub"
+
+        if [ '!' -f "$private_key_file" ] ; then
+            ssh-keygen \
+                -q -t "$key_type" -N "" -f "$private_key_file"
+            chmod 600 "$private_key_file"
+            chmod 644 "$public_key_file"
+        fi
+    done
+
+    mkdir -p /var/run/sshd
+
+    pgrep -u 0 -U 0 sshd &> /dev/null
+    if [ '!' "$?" '=' '0' ] ; then
+        nohup /usr/sbin/sshd -f /etc/ssh/sshd_config < /dev/null &> /dev/null
+    fi
+fi
+
+if [ '!' -f "$HOME/.ssh/id_rsa" ] ; then
+    ssh-keygen \
+        -t rsa -C "spack.developer@docker.host" -N "" -f "$HOME/.ssh/id_rsa"
+    cat "$HOME/.ssh/id_rsa.pub" >> "$HOME/.ssh/authorized_keys"
+    chmod 600 "$HOME/.ssh/authorized_keys"
+
+    docker_ip="`ip address show dev eth0 |
+                grep inet |
+                cut -d' ' -f 6 |
+                cut -d/ -f 1`"
+
+    ssh-keyscan -t rsa 127.0.0.1 localhost "$docker_ip" "`hostname`" \
+        > "$HOME/.ssh/known_hosts" 2> /dev/null
+fi
diff --git a/share/spack/docker/spack_fedora/modules.yaml b/share/spack/docker/spack_fedora/modules.yaml
new file mode 100644
index 0000000000..02907ecc40
--- /dev/null
+++ b/share/spack/docker/spack_fedora/modules.yaml
@@ -0,0 +1,6 @@
+modules:
+  enable:
+    - lmod
+  lmod:
+    core_compilers:
+      - gcc
diff --git a/share/spack/docker/spack_opensuse/Dockerfile b/share/spack/docker/spack_opensuse/Dockerfile
new file mode 100644
index 0000000000..9bc31dcf0c
--- /dev/null
+++ b/share/spack/docker/spack_opensuse/Dockerfile
@@ -0,0 +1,65 @@
+FROM opensuse
+MAINTAINER Omar Padron <omar.padron@kitware.com>
+
+ENV SPACK_ROOT=/spack        \
+    FORCE_UNSAFE_CONFIGURE=1 \
+    DISTRO=opensuse
+
+RUN zypper -n ref                                        && \
+    zypper -n up --skip-interactive --no-recommends      && \
+    zypper -n install -l --no-recommends --type pattern     \
+        devel_basis                                         \
+        devel_C_C++                                      && \
+    zypper -n install -l --no-recommends                    \
+        bash                                                \
+        bash-completion                                     \
+        ca-certificates                                     \
+        curl                                                \
+        findutils                                           \
+        gcc                                                 \
+        gcc-locale                                          \
+        gcc-c++                                             \
+        gcc-fortran                                         \
+        git                                                 \
+        glibc-locale                                        \
+        gpg2                                                \
+        hostname                                            \
+        iproute                                             \
+        lua-lmod                                            \
+        make                                                \
+        patch                                               \
+        openssh                                             \
+        python                                              \
+        python-xml                                          \
+        tcl                                              && \
+    git clone --depth 1 git://github.com/spack/spack.git /spack && \
+    zypper clean                                                && \
+    rm -rf /spack/.git /var/cache/zypp/*
+
+RUN echo "source /usr/share/lmod/lmod/init/bash" \
+    > /etc/profile.d/spack.sh
+RUN echo "source /spack/share/spack/setup-env.sh" \
+    >> /etc/profile.d/spack.sh
+RUN echo "source /spack/share/spack/spack-completion.bash" \
+    >> /etc/profile.d/spack.sh
+COPY handle-ssh.sh /etc/profile.d/handle-ssh.sh
+COPY handle-prompt.sh /etc/profile.d/handle-prompt.sh.source
+
+RUN (                                                         \
+    echo "export DISTRO=$DISTRO"                            ; \
+    echo "if [ x\$PROMPT '!=' 'x' -a x\$PROMPT '!=' 'x0' ]" ; \
+    echo "then"                                             ; \
+    echo "source /etc/profile.d/handle-prompt.sh.source"    ; \
+    echo "fi"                                               ; \
+) > /etc/profile.d/handle-prompt.sh
+
+RUN mkdir -p /root/.spack
+COPY modules.yaml /root/.spack/modules.yaml
+
+RUN rm -f /run/nologin
+
+RUN rm -rf /root/*.*
+
+WORKDIR /root
+ENTRYPOINT ["bash"]
+CMD ["-l"]
diff --git a/share/spack/docker/spack_opensuse/handle-prompt.sh b/share/spack/docker/spack_opensuse/handle-prompt.sh
new file mode 100644
index 0000000000..15ef53e316
--- /dev/null
+++ b/share/spack/docker/spack_opensuse/handle-prompt.sh
@@ -0,0 +1,143 @@
+__tmp="`mktemp -d`"
+
+__trylock() {
+    local dir
+    dir="$__tmp/$1.lock"
+    mkdir "$dir" &>/dev/null
+    return $?
+}
+
+__queue_init() {
+    local r
+    local w
+
+    mkdir "$__tmp/$1.read.lock" ; r=$?
+    mkdir "$__tmp/$1.write.lock" ; w=$?
+
+    if [ "$r" '=' '0' -a "$w" '=' '0' ] ; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+__queue_try_read() {
+    __trylock "$1.read"
+    return $?
+}
+
+__queue_try_write() {
+    __trylock "$1.write"
+    return $?
+}
+
+__queue_make_readable() {
+    rm -r "$__tmp/$1.read.lock" &>/dev/null
+    return $?
+}
+
+__queue_make_writable() {
+    rm -r "$__tmp/$1.write.lock" &>/dev/null
+    return $?
+}
+
+__read() {
+    cat "$__tmp/$1" 2> /dev/null
+    return $?
+}
+
+__write() {
+    cat > "$__tmp/$1" 2> /dev/null
+    return $?
+}
+
+__update_prompt() {
+    local prompt
+    prompt=''
+    linux_distro="$DISTRO"
+    if [ -n "$linux_distro" ] ; then
+        linux_distro='\[\e[1;34m\][\[\e[0;34m\]'"$linux_distro"'\[\e[1;34m\]]'
+        if [ -n "$prompt" ] ; then
+            prompt="$prompt "
+        fi
+        prompt="$prompt$linux_distro"
+    fi
+
+    git_head="`git --git-dir=/spack/.git --work-tree=/spack rev-parse --abbrev-ref HEAD 2>/dev/null`"
+    if [ "$?" '=' '0' ] ; then
+        if [ "$git_head" '=' 'HEAD' ] ; then
+            git_head="`git --git-dir=/spack/.git --work-tree=/spack rev-parse HEAD 2>/dev/null | cut -c1-8`..."
+        fi
+    else
+        git_head=''
+    fi
+
+    if [ -n "$git_head" ] ; then
+        git_head='\[\e[1;32m\](\[\e[0;32m\]'"$git_head"'\[\e[1;32m\])'
+        if [ -n "$prompt" ] ; then
+            prompt="$prompt "
+        fi
+        prompt="$prompt$git_head"
+    fi
+
+    if [ -n "$prompt" ] ; then
+        prompt="$prompt "
+    fi
+    prompt="$prompt"'\[\e[0;m\]\W: '
+    echo "$prompt" | __write prompt
+}
+
+set -m
+(
+    __queue_init query
+    __queue_init prompt
+
+    __update_prompt
+    __queue_make_readable prompt
+
+    __queue_make_writable query
+
+    while sleep 0.010 ; do
+        last_q_time=''
+
+        while sleep 0.010 ; do
+            q_time="`date +%s%N`"
+            if __queue_try_read query ; then
+                last_q_time="$q_time"
+                __queue_make_writable query
+            fi
+
+            if [ -n "$last_q_time" -a \
+                "$(( (q_time - last_q_time)/10000000 > 100 ))" '=' '1' ] ; then
+                break
+            fi
+        done
+
+        __update_prompt
+        __queue_make_readable prompt
+    done
+) &>/dev/null &
+set +m
+
+__update_prompt_main_first_call=1
+__update_prompt_main() {
+    if [ "$__update_prompt_main_first_call" '=' '1' ] ; then
+        while sleep 0.001 ; do
+            if __queue_try_read prompt ; then
+                PS1="`__read prompt`"
+                break
+            fi
+        done
+        __update_prompt_main_first_call=0
+    else
+        if __queue_try_read prompt ; then
+            PS1="`__read prompt`"
+        fi
+    fi
+
+    if __queue_try_write query ; then
+        __queue_make_readable query
+    fi
+}
+
+PROMPT_COMMAND=__update_prompt_main
diff --git a/share/spack/docker/spack_opensuse/handle-ssh.sh b/share/spack/docker/spack_opensuse/handle-ssh.sh
new file mode 100644
index 0000000000..f13c10e212
--- /dev/null
+++ b/share/spack/docker/spack_opensuse/handle-ssh.sh
@@ -0,0 +1,36 @@
+uid="`id -u`"
+if [ "$uid" '=' '0' ] ; then
+    for key_type in dsa ecdsa ed25519 rsa ; do
+        private_key_file="/etc/ssh/ssh_host_${key_type}_key"
+        public_key_file="$private_key_file.pub"
+
+        if [ '!' -f "$private_key_file" ] ; then
+            ssh-keygen \
+                -q -t "$key_type" -N "" -f "$private_key_file"
+            chmod 600 "$private_key_file"
+            chmod 644 "$public_key_file"
+        fi
+    done
+
+    mkdir -p /var/run/sshd
+
+    pgrep -u 0 -U 0 sshd &> /dev/null
+    if [ '!' "$?" '=' '0' ] ; then
+        nohup /usr/sbin/sshd -f /etc/ssh/sshd_config < /dev/null &> /dev/null
+    fi
+fi
+
+if [ '!' -f "$HOME/.ssh/id_rsa" ] ; then
+    ssh-keygen \
+        -t rsa -C "spack.developer@docker.host" -N "" -f "$HOME/.ssh/id_rsa"
+    cat "$HOME/.ssh/id_rsa.pub" >> "$HOME/.ssh/authorized_keys"
+    chmod 600 "$HOME/.ssh/authorized_keys"
+
+    docker_ip="`ip address show dev eth0 |
+                grep inet |
+                cut -d' ' -f 6 |
+                cut -d/ -f 1`"
+
+    ssh-keyscan -t rsa 127.0.0.1 localhost "$docker_ip" "`hostname`" \
+        > "$HOME/.ssh/known_hosts" 2> /dev/null
+fi
diff --git a/share/spack/docker/spack_opensuse/modules.yaml b/share/spack/docker/spack_opensuse/modules.yaml
new file mode 100644
index 0000000000..02907ecc40
--- /dev/null
+++ b/share/spack/docker/spack_opensuse/modules.yaml
@@ -0,0 +1,6 @@
+modules:
+  enable:
+    - lmod
+  lmod:
+    core_compilers:
+      - gcc
diff --git a/share/spack/docker/spack_ubuntu/Dockerfile b/share/spack/docker/spack_ubuntu/Dockerfile
new file mode 100644
index 0000000000..8c1caac61b
--- /dev/null
+++ b/share/spack/docker/spack_ubuntu/Dockerfile
@@ -0,0 +1,51 @@
+FROM ubuntu
+MAINTAINER Omar Padron <omar.padron@kitware.com>
+
+ENV DEBIAN_FRONTEND=noninteractive \
+    SPACK_ROOT=/spack              \
+    FORCE_UNSAFE_CONFIGURE=1       \
+    DISTRO=ubuntu
+
+RUN apt-get -yqq update && apt-get -yqq install \
+        build-essential     \
+        ca-certificates     \
+        curl                \
+        g++                 \
+        gcc                 \
+        gfortran            \
+        git                 \
+        gnupg2              \
+        lmod                \
+        make                \
+        openssh-server      \
+        python              \
+        tcl              && \
+    git clone --depth 1 git://github.com/spack/spack.git /spack && \
+    rm -rf /spack/.git && rm -rf /var/lib/apt/lists/*
+
+RUN echo "source /usr/share/lmod/lmod/init/bash" \
+    > /etc/profile.d/spack.sh
+RUN echo "source /spack/share/spack/setup-env.sh" \
+    >> /etc/profile.d/spack.sh
+RUN echo "source /spack/share/spack/spack-completion.bash" \
+    >> /etc/profile.d/spack.sh
+COPY handle-ssh.sh /etc/profile.d/handle-ssh.sh
+COPY handle-prompt.sh /etc/profile.d/handle-prompt.sh.source
+
+
+RUN (                                                         \
+    echo "export DISTRO=$DISTRO"                            ; \
+    echo "if [ x\$PROMPT '!=' 'x' -a x\$PROMPT '!=' 'x0' ]" ; \
+    echo "then"                                             ; \
+    echo "source /etc/profile.d/handle-prompt.sh.source"    ; \
+    echo "fi"                                               ; \
+) > /etc/profile.d/handle-prompt.sh
+
+RUN mkdir -p /root/.spack
+COPY modules.yaml /root/.spack/modules.yaml
+
+RUN rm -rf /root/*.*
+
+WORKDIR /root
+ENTRYPOINT ["bash"]
+CMD ["-l"]
diff --git a/share/spack/docker/spack_ubuntu/handle-prompt.sh b/share/spack/docker/spack_ubuntu/handle-prompt.sh
new file mode 100644
index 0000000000..bf62224a60
--- /dev/null
+++ b/share/spack/docker/spack_ubuntu/handle-prompt.sh
@@ -0,0 +1,143 @@
+__tmp="`mktemp -d`"
+
+__trylock() {
+    local dir
+    dir="$__tmp/$1.lock"
+    mkdir "$dir" &>/dev/null
+    return $?
+}
+
+__queue_init() {
+    local r
+    local w
+
+    mkdir "$__tmp/$1.read.lock" ; r=$?
+    mkdir "$__tmp/$1.write.lock" ; w=$?
+
+    if [ "$r" '=' '0' -a "$w" '=' '0' ] ; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+__queue_try_read() {
+    __trylock "$1.read"
+    return $?
+}
+
+__queue_try_write() {
+    __trylock "$1.write"
+    return $?
+}
+
+__queue_make_readable() {
+    rm -r "$__tmp/$1.read.lock" &>/dev/null
+    return $?
+}
+
+__queue_make_writable() {
+    rm -r "$__tmp/$1.write.lock" &>/dev/null
+    return $?
+}
+
+__read() {
+    cat "$__tmp/$1" 2> /dev/null
+    return $?
+}
+
+__write() {
+    cat > "$__tmp/$1" 2> /dev/null
+    return $?
+}
+
+__update_prompt() {
+    local prompt
+    prompt=''
+    linux_distro="$DISTRO"
+    if [ -n "$linux_distro" ] ; then
+        linux_distro='\[\e[1;34m\][\[\e[0;34m\]'"$linux_distro"'\[\e[1;34m\]]'
+        if [ -n "$prompt" ] ; then
+            prompt="$prompt "
+        fi
+        prompt="$prompt$linux_distro"
+    fi
+
+    git_head="`git -C /spack rev-parse --abbrev-ref HEAD 2>/dev/null`"
+    if [ "$?" '=' '0' ] ; then
+        if [ "$git_head" '=' 'HEAD' ] ; then
+            git_head="`git -C /spack rev-parse HEAD 2>/dev/null | cut -c1-8`..."
+        fi
+    else
+        git_head=''
+    fi
+
+    if [ -n "$git_head" ] ; then
+        git_head='\[\e[1;32m\](\[\e[0;32m\]'"$git_head"'\[\e[1;32m\])'
+        if [ -n "$prompt" ] ; then
+            prompt="$prompt "
+        fi
+        prompt="$prompt$git_head"
+    fi
+
+    if [ -n "$prompt" ] ; then
+        prompt="$prompt "
+    fi
+    prompt="$prompt"'\[\e[0;m\]\W: '
+    echo "$prompt" | __write prompt
+}
+
+set -m
+(
+    __queue_init query
+    __queue_init prompt
+
+    __update_prompt
+    __queue_make_readable prompt
+
+    __queue_make_writable query
+
+    while sleep 0.010 ; do
+        last_q_time=''
+
+        while sleep 0.010 ; do
+            q_time="`date +%s%N`"
+            if __queue_try_read query ; then
+                last_q_time="$q_time"
+                __queue_make_writable query
+            fi
+
+            if [ -n "$last_q_time" -a \
+                "$(( (q_time - last_q_time)/10000000 > 100 ))" '=' '1' ] ; then
+                break
+            fi
+        done
+
+        __update_prompt
+        __queue_make_readable prompt
+    done
+) &>/dev/null &
+set +m
+
+__update_prompt_main_first_call=1
+__update_prompt_main() {
+    if [ "$__update_prompt_main_first_call" '=' '1' ] ; then
+        while sleep 0.001 ; do
+            if __queue_try_read prompt ; then
+                PS1="`__read prompt`"
+                break
+            fi
+        done
+        __update_prompt_main_first_call=0
+    else
+        if __queue_try_read prompt ; then
+            PS1="`__read prompt`"
+        fi
+    fi
+
+    if __queue_try_write query ; then
+        __queue_make_readable query
+    fi
+}
+
+PROMPT_COMMAND=__update_prompt_main
diff --git a/share/spack/docker/spack_ubuntu/handle-ssh.sh b/share/spack/docker/spack_ubuntu/handle-ssh.sh
new file mode 100644
index 0000000000..f13c10e212
--- /dev/null
+++ b/share/spack/docker/spack_ubuntu/handle-ssh.sh
@@ -0,0 +1,36 @@
+uid="`id -u`"
+if [ "$uid" '=' '0' ] ; then
+    for key_type in dsa ecdsa ed25519 rsa ; do
+        private_key_file="/etc/ssh/ssh_host_${key_type}_key"
+        public_key_file="$private_key_file.pub"
+
+        if [ '!' -f "$private_key_file" ] ; then
+            ssh-keygen \
+                -q -t "$key_type" -N "" -f "$private_key_file"
+            chmod 600 "$private_key_file"
+            chmod 644 "$public_key_file"
+        fi
+    done
+
+    mkdir -p /var/run/sshd
+
+    pgrep -u 0 -U 0 sshd &> /dev/null
+    if [ '!' "$?" '=' '0' ] ; then
+        nohup /usr/sbin/sshd -f /etc/ssh/sshd_config < /dev/null &> /dev/null
+    fi
+fi
+
+if [ '!' -f "$HOME/.ssh/id_rsa" ] ; then
+    ssh-keygen \
+        -t rsa -C "spack.developer@docker.host" -N "" -f "$HOME/.ssh/id_rsa"
+    cat "$HOME/.ssh/id_rsa.pub" >> "$HOME/.ssh/authorized_keys"
+    chmod 600 "$HOME/.ssh/authorized_keys"
+
+    docker_ip="`ip address show dev eth0 |
+                grep inet |
+                cut -d' ' -f 6 |
+                cut -d/ -f 1`"
+
+    ssh-keyscan -t rsa 127.0.0.1 localhost "$docker_ip" "`hostname`" \
+        > "$HOME/.ssh/known_hosts" 2> /dev/null
+fi
diff --git a/share/spack/docker/spack_ubuntu/modules.yaml b/share/spack/docker/spack_ubuntu/modules.yaml
new file mode 100644
index 0000000000..02907ecc40
--- /dev/null
+++ b/share/spack/docker/spack_ubuntu/modules.yaml
@@ -0,0 +1,6 @@
+modules:
+  enable:
+    - lmod
+  lmod:
+    core_compilers:
+      - gcc