Merge branch 'before-merge'

4 files changed, 465 insertions, 0 deletions

diff --git a/krebs/3modules/build/default.nix b/krebs/3modules/build/default.nix
new file mode 100644
index 000000000..4d2f36a02
--- /dev/null
+++ b/krebs/3modules/build/default.nix
@@ -0,0 +1,269 @@
+{ config, lib, ... }:
+
+with import ../../4lib { inherit lib; };
+
+let
+  target = config.krebs.build // { user.name = "root"; };
+
+  out = {
+    # TODO deprecate krebs.build.host
+    options.krebs.build.host = mkOption {
+      type = types.host;
+    };
+
+    # TODO make krebs.build.profile shell safe
+    options.krebs.build.profile = mkOption {
+      type = types.str;
+      default = "/nix/var/nix/profiles/system";
+    };
+
+    # TODO make krebs.build.target.host :: host
+    options.krebs.build.target = mkOption {
+      type = with types; nullOr str;
+      default = null;
+    };
+
+    # TODO deprecate krebs.build.user
+    options.krebs.build.user = mkOption {
+      type = types.user;
+    };
+
+    options.krebs.build.scripts.deploy = lib.mkOption {
+      type = lib.types.str;
+      default = ''
+        set -efu
+        (${config.krebs.build.scripts._source})
+        ${ssh-target ''
+          ${config.krebs.build.scripts._nix-env}
+          ${config.krebs.build.profile}/bin/switch-to-configuration switch
+        ''}
+        echo OK
+      '';
+    };
+
+    options.krebs.build.scripts.infest = lib.mkOption {
+      type = lib.types.str;
+      default = ''
+        set -efu
+
+        export RSYNC_RSH; RSYNC_RSH="$(type -p ssh) \
+          -o 'HostName ${target.host.infest.addr}' \
+          -o 'Port ${toString target.host.infest.port}' \
+        "
+        ssh() {
+          eval "$RSYNC_RSH \"\$@\""
+        }
+
+        ${ssh-target ''
+          ${readFile ./infest/prepare.sh}
+          ${readFile ./infest/install-nix.sh}
+        ''}
+
+        (${config.krebs.build.scripts._source})
+
+        ${ssh-target ''
+          export PATH; PATH=/root/.nix-profile/bin:$PATH
+
+          src=$(type -p nixos-install)
+          cat_src() {
+            sed < "$src" "$(
+              sed < "$src" -n '
+                  /^if ! test -e "\$mountPoint\/\$NIXOS_CONFIG/,/^fi$/=
+                  /^nixpkgs=/=
+                  /^NIX_PATH=/,/^$/{/./=}
+                ' \
+                | sed 's:$:s/^/#krebs#/:'
+            )"
+          }
+
+          # Location to insert config.krebs.build.scripts._nix-env
+          i=$(sed -n '/^echo "building the system configuration/=' "$src")
+
+          {
+            cat_src | sed -n "1,$i{p}"
+            cat ${doc config.krebs.build.scripts._nix-env}
+            cat_src | sed -n "$i,\''${$i!p}"
+          } > nixos-install
+          chmod +x nixos-install
+
+          # Wrap inserted config.krebs.build.scripts._nix-env into chroot.
+          nix_env=$(cat_src | sed -n '
+            s:.*\(/nix/store/[a-z0-9]*-nix-[0-9.]\+/bin/nix-env\).*:\1:p;T;q
+          ')
+          echo nix-env is $nix_env
+          sed -i '
+            s:^nix-env:chroot $mountPoint '"$nix_env"':
+          ' nixos-install
+
+          ./nixos-install
+
+          ${readFile ./infest/finalize.sh}
+        ''}
+      '';
+    };
+
+    options.krebs.build.scripts._nix-env = lib.mkOption {
+      type = lib.types.str;
+      default = ''
+        set -efu
+        NIX_PATH=${config.krebs.build.source.NIX_PATH} \
+        nix-env \
+          -f '<stockholm>' \
+          -Q \
+          --argstr user-name ${config.krebs.exec.user.name} \
+          --argstr host-name ${target.host.name} \
+          --profile ${config.krebs.build.profile} \
+          --set \
+          -A ${lib.escapeShellArg (lib.concatStringsSep "." [
+                config.krebs.build.user.name
+                config.krebs.build.host.name
+                "system"
+              ])}
+      '';
+    };
+
+    options.krebs.build.scripts._source = lib.mkOption {
+      type = lib.types.str;
+      default = ''
+        set -efu
+        ${
+          lib.concatStringsSep "\n"
+            (lib.mapAttrsToList
+              (name: { scripts, url, ... }: "(${scripts._source})")
+              (config.krebs.build.source.dir //
+               config.krebs.build.source.git))
+        }
+      '';
+    };
+
+    options.krebs.build.source.NIX_PATH = mkOption {
+      type = types.str;
+      default =
+        lib.concatStringsSep ":"
+          (lib.mapAttrsToList (name: _: "${name}=/root/${name}")
+            (config.krebs.build.source.dir //
+             config.krebs.build.source.git));
+    };
+
+    options.krebs.build.source.dir = mkOption {
+      type =
+        let
+          exec = config.krebs.exec;
+        in
+        types.attrsOf (types.submodule ({ config, ... }:
+          let
+            url = "file://${config.host.name}${config.path}";
+
+            can-link = config.host.name == target.host.name;
+            can-push = config.host.name == exec.host.name;
+
+            push-method = ''
+              rsync \
+                --exclude .git \
+                --exclude .graveyard \
+                --exclude old \
+                --exclude tmp \
+                --rsync-path='mkdir -p ${config.target-path} && rsync' \
+                --delete-excluded \
+                -vrLptgoD \
+                ${config.path}/ \
+                ${target.user.name}@${target.host.name}:${config.target-path}
+            '';
+          in
+          {
+            options = {
+              host = mkOption {
+                type = types.host;
+                description = ''
+                define the host where the directory is stored on.
+                XXX: currently it is just used to check if rsync is working,
+                     becomes part of url
+                '';
+              };
+              path = mkOption {
+                type = types.str;
+              };
+              scripts._source = mkOption {
+                type = types.str;
+                default =
+                  #if can-link then link-method else
+                  if can-push then push-method else
+                  throw "cannot source ${url}";
+              };
+              target-path = mkOption {
+                type = types.str;
+                default = "/root/${config._module.args.name}";
+              };
+              url = mkOption {
+                type = types.str;
+                default = "file://${config.host.name}${config.path}";
+              };
+            };
+          }
+        ));
+      default = {};
+    };
+
+    options.krebs.build.source.git = mkOption {
+      type =
+        let
+          target = config.krebs.build // { user.name = "root"; };
+        in
+        with types; attrsOf (submodule ({ config, ... }:
+          {
+            options = {
+              url = mkOption {
+                type = types.str; # TODO must be shell safe
+              };
+              rev = mkOption {
+                type = types.str;
+              };
+              scripts._source = mkOption {
+                type = types.str;
+                default = ssh-target ''
+                  mkdir -p ${config.target-path}
+                  cd ${config.target-path}
+                  if ! test -e .git; then
+                    git init
+                  fi
+                  if ! cur_url=$(git config remote.origin.url 2>/dev/null); then
+                    git remote add origin ${config.url}
+                  elif test "$cur_url" != ${config.url}; then
+                    git remote set-url origin ${config.url}
+                  fi
+                  if test "$(git rev-parse --verify HEAD 2>/dev/null)" != ${config.rev}; then
+                    git fetch origin
+                    git checkout ${config.rev} -- .
+                    git checkout -q ${config.rev}
+                    git submodule init
+                    git submodule update
+                  fi
+                  git clean -dxf
+                '';
+              };
+              target-path = mkOption {
+                type = types.str;
+                default = "/root/${config._module.args.name}";
+              };
+            };
+          }
+      ));
+      default = {};
+    };
+  };
+
+  doc = s:
+    let b = "EOF${hashString "sha256" s}"; in
+    ''
+    <<\${b}
+    ${s}
+    ${b}
+    '';
+
+  ssh-target = script:
+    "ssh root@${target.host.name} -T ${doc ''
+      set -efu
+      ${script}
+    ''}";
+
+in out
diff --git a/krebs/3modules/build/infest/finalize.sh b/krebs/3modules/build/infest/finalize.sh
new file mode 100644
index 000000000..ced5a4d4d
--- /dev/null
+++ b/krebs/3modules/build/infest/finalize.sh
@@ -0,0 +1,65 @@
+#! /bin/sh
+set -eux
+{
+  umount /mnt/nix || [ $? -eq 32 ]
+  umount /mnt/boot || [ $? -eq 32 ]
+  umount /mnt/root || [ $? -eq 32 ]
+  umount /mnt || [ $? -eq 32 ]
+  umount /boot || [ $? -eq 32 ]
+
+  PATH=$(set +f; for i in /nix/store/*coreutils*/bin; do :; done; echo $i)
+  export PATH
+
+  mkdir /oldshit
+
+  mv /bin /oldshit/
+  mv /newshit/bin /
+
+  # TODO ensure /boot is empty
+  rmdir /newshit/boot
+
+  # skip /dev
+  rmdir /newshit/dev
+
+  mv /etc /oldshit/
+  mv /newshit/etc /
+
+  # skip /nix (it's already there)
+  rmdir /newshit/nix
+
+  # skip /proc
+  rmdir /newshit/proc
+
+  # skip /run
+  rmdir /newshit/run
+
+  # skip /sys
+  rmdir /newshit/sys
+
+  # skip /root
+  rmdir /newshit/root
+
+  # skip /tmp
+  # TODO rmdir /newshit/tmp
+
+  mv /home /oldshit/
+  mv /newshit/home /
+
+  mv /usr /oldshit/
+  mv /newshit/usr /
+
+  mv /var /oldshit/
+  mv /newshit/var /
+
+  mv /lib /oldshit/
+  mv /lib64 /oldshit/
+  mv /sbin /oldshit/
+  mv /srv /oldshit/
+  mv /opt /oldshit/
+
+
+  mv /newshit /root/  # TODO this one shoult be empty
+  mv /oldshit /root/
+
+  sync
+}
diff --git a/krebs/3modules/build/infest/install-nix.sh b/krebs/3modules/build/infest/install-nix.sh
new file mode 100644
index 000000000..88c8c3e1e
--- /dev/null
+++ b/krebs/3modules/build/infest/install-nix.sh
@@ -0,0 +1,57 @@
+#! /bin/sh
+set -efu
+
+nix_url=https://nixos.org/releases/nix/nix-1.10/nix-1.10-x86_64-linux.tar.bz2
+nix_sha256=504f7a3a85fceffb8766ae5e1005de9e02e489742f5a63cc3e7552120b138bf4
+
+install_nix() {(
+
+  # install nix on host (cf. https://nixos.org/nix/install)
+  if ! test -e /root/.nix-profile/etc/profile.d/nix.sh; then
+    (
+      verify() {
+        printf '%s  %s\n' $nix_sha256  $(basename $nix_url) | sha256sum -c
+      }
+      if ! verify; then
+        curl -C - -O "$nix_url"
+        verify
+      fi
+    )
+    nix_src_dir=$(basename $nix_url .tar.bz2)
+    tar jxf $nix_src_dir.tar.bz2
+    mkdir -v -m 0755 -p /nix
+    $nix_src_dir/install
+  fi
+
+  #TODO: make this general or move to prepare
+  if ! mount | grep -Fq '/dev/mapper/centos-root on /mnt/nix type xfs'; then
+    mkdir -p /mnt/nix
+    mount --bind /nix /mnt/nix
+  fi
+
+  . /root/.nix-profile/etc/profile.d/nix.sh
+
+  for i in \
+    bash \
+    coreutils \
+    # This line intentionally left blank.
+  do
+    if ! nix-env -q $i | grep -q .; then
+      nix-env -iA nixpkgs.pkgs.$i
+    fi
+  done
+
+  # install nixos-install
+  if ! type nixos-install 2>/dev/null; then
+    nixpkgs_expr='import <nixpkgs> { system = builtins.currentSystem; }'
+    nixpkgs_path=$(find /nix/store -mindepth 1 -maxdepth 1 -name *-nixpkgs-* -type d)
+    nix-env \
+      --arg config "{ nix.package = ($nixpkgs_expr).nix; }" \
+      --arg pkgs "$nixpkgs_expr" \
+      --arg modulesPath 'throw "no modulesPath"' \
+      -f $nixpkgs_path/nixpkgs/nixos/modules/installer/tools/tools.nix \
+      -iA config.system.build.nixos-install
+  fi
+)}
+
+install_nix "$@"
diff --git a/krebs/3modules/build/infest/prepare.sh b/krebs/3modules/build/infest/prepare.sh
new file mode 100644
index 000000000..07c00c3a5
--- /dev/null
+++ b/krebs/3modules/build/infest/prepare.sh
@@ -0,0 +1,74 @@
+#! /bin/sh
+set -efu
+
+prepare() {(
+  if test -e /etc/os-release; then
+    . /etc/os-release
+    case $ID in
+      centos)
+        case $VERSION_ID in
+          7)
+            prepare_centos7 "$@"
+            exit
+            ;;
+        esac
+        ;;
+    esac
+  fi
+  echo "$0 prepare: unknown OS" >&2
+  exit -1
+)}
+
+prepare_centos7() {
+  type bzip2 2>/dev/null || yum install -y bzip2
+  type git   2>/dev/null || yum install -y git
+  type rsync 2>/dev/null || yum install -y rsync
+  if ! getent group nixbld >/dev/null; then
+    groupadd -g 30000 -r nixbld
+  fi
+  for i in `seq 1 10`; do
+    if ! getent passwd nixbld$i 2>/dev/null; then
+      useradd \
+        -c "CentOS Nix build user $i" \
+        -d /var/empty \
+        -g 30000 \
+        -G 30000 \
+        -l \
+        -M \
+        -s /sbin/nologin \
+        -u $(expr 30000 + $i) \
+        nixbld$i
+      rm -f /var/spool/mail/nixbld$i
+    fi
+  done
+
+  #
+  # mount install directory
+  #
+
+  if ! mount | grep -Fq '/dev/mapper/centos-root on /mnt type xfs'; then
+    mkdir -p /newshit
+    mount --bind /newshit /mnt
+  fi
+
+  if ! mount | grep -Fq '/dev/sda1 on /mnt/boot type xfs'; then
+    mkdir -p /mnt/boot
+    mount /dev/sda1 /mnt/boot
+  fi
+
+  mount | grep 'on /mnt\>' >&2
+
+  #
+  # prepare install directory
+  #
+
+  mkdir -p /mnt/etc/nixos
+  mkdir -m 0555 -p /mnt/var/empty
+
+  if ! mount | grep -Fq '/dev/mapper/centos-root on /mnt/root type xfs'; then
+    mkdir -p /mnt/root
+    mount --bind /root /mnt/root
+  fi
+}
+
+prepare "$@"