docker: crate docker host setup

readme: standardize keyboard input notation to the format: Ctrl-C

configure

@@ -18,42 +18,23 @@ while getopts gpqt OPT; do
       ;;
     t)
       interactive_pkgs=
-      y='-y'
+      y=-y
       ;;
   esac
 done
 shift $(($OPTIND - 1))
 
-## Submodules
-
-if "$qemu"; then
-  submodules="$submodules qemu"
-fi
-if "$gem5"; then
-  submodules="$submodules gem5/gem5"
-fi
-(
-  set -e
-  # Shallow cloning saves a considerable amount of time, specially because of the linux kernel.
-  # However, git submodules are buggy as usual, and this is the best way I've found to get it done:
-  # https://stackoverflow.com/questions/2144406/git-shallow-submodules/47374702#47374702
-  # In particular:
-  # - `shallow = true` on the submodule has no effect for the non default educational branches of our submodules
-  # - QEMU's submodules point to commits that are neither under branches nor tags, and so `--shallow-submodules` fails
-  git submodule update --depth 1 --jobs 4 --init -- $submodules
-  if "$qemu"; then
-    cd qemu
-    git submodule update --init
-  fi
-) &
-wait $! || git submodule update --init -- $submodules
-
 ## apt-get
 
 pkgs="\
 automake \
+bc \
 build-essential \
 coreutils \
+cpio \
+git \
+unzip \
+wget \
 "
 if "$gem5"; then
   pkgs="$pkgs \
@@ -61,6 +42,8 @@ gcc-aarch64-linux-gnu \
 gcc-arm-linux-gnueabi \
 libgoogle-perftools-dev \
 protobuf-compiler \
+python-dev \
+scons \
 "
 fi
 command -v apt-get >/dev/null 2>&1 || {
@@ -78,16 +61,53 @@ EOF
 # Makefile:932: *** "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel".  Stop.                                                       
 pkgs="$pkgs libelf-dev"
 
-sudo apt-get update $y
+# https://stackoverflow.com/questions/20010199/determining-if-a-process-runs-inside-lxc-docker
+if [ -f /.dockerenv ]; then
+  # --jobs is not available in git 2.7.4 from Ubuntu 16.04.
+  gitjobs=
+  mysudo=
+  # https://askubuntu.com/questions/496549/error-you-must-put-some-source-uris-in-your-sources-list
+  sed -Ei 's/^# deb-src/deb-src/' /etc/apt/sources.list
+  y=-y
+else
+  gitjobs="--jobs $(nproc)"
+  mysudo=sudo
+fi
+$mysudo apt-get update $y
 # Building SDL for QEMU in Buildroot was rejected upstream because it adds many dependencies:
 # https://patchwork.ozlabs.org/patch/770684/
 # We are just using the host SDL for now, if it causes too much problems we might remove it.
 # libsdl2-dev needs to be installed separatedly from sudo apt-get build-dep qemu
 # because Ubuntu 16.04's QEMU uses SDL 1.
-sudo apt-get install $y \
+$mysudo apt-get install $y \
   $pkgs \
   $interactive_pkgs \
 ;
 if "$qemu"; then
-  sudo apt-get build-dep $y qemu
+  $mysudo apt-get build-dep $y qemu
 fi
+
+## Submodules
+
+if "$qemu"; then
+  submodules="$submodules qemu"
+fi
+if "$gem5"; then
+  submodules="$submodules gem5/gem5"
+fi
+(
+  set -e
+  # Shallow cloning saves a considerable amount of time, specially because of the linux kernel.
+  # However, git submodules are buggy as usual, and this is the best way I've found to get it done:
+  # https://stackoverflow.com/questions/2144406/git-shallow-submodules/47374702#47374702
+  # In particular:
+  # - `shallow = true` on the submodule has no effect for the non default educational branches of our submodules
+  # - QEMU's submodules point to commits that are neither under branches nor tags, and so `--shallow-submodules` fails
+  #
+  git submodule update --depth 1 $gitjobs --init -- $submodules
+  if "$qemu"; then
+    cd qemu
+    git submodule update --init
+  fi
+) &
+wait $! || git submodule update --init -- $submodules