{tv 2 => krebs 3} backup

1 files changed, 28 insertions, 240 deletions

diff --git a/tv/2configs/backup.nix b/tv/2configs/backup.nix
index 1cef0a6d..51d3bb8a 100644
--- a/tv/2configs/backup.nix
+++ b/tv/2configs/backup.nix
@@ -1,38 +1,22 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, ... }:
 with lib;
-let
-  # Users that are allowed to connect to the backup user.
-  # Note: the user must own a push plan destination otherwise no rsync.
-  backup-users = [
-    config.krebs.users.tv
-  ];
-
-  ## TODO parse.file-location admit user
-  ## loc has the form <host-name>:<abs-path>
-  #parse.file-location = loc: let
-  #  parts = splitString ":" loc;
-  #  host-name = head parts;
-  #  path = concatStringsSep ":" (tail parts);
-  #in {
-  #  type = "types.krebs.file-location";
-  #  host = config.krebs.hosts.${host-name};
-  #  path = path;
-  #};
-
-  # TODO assert plan.dst.path & co
-  plans = with config.krebs.users; with config.krebs.hosts; addNames {
+{
+  krebs.backup.plans = addNames {
     xu-test-cd = {
       method = "push";
-      #src = parse.file-location xu:/tmp/xu-test;
-      #dst = parse.file-location cd:/krebs/backup/xu-test;
-      src = { user = tv; host = xu; path = "/tmp/xu-test"; };
-      dst = { user = tv; host = cd; path = "/krebs/backup/xu-test"; };
-      startAt = "0,6,12,18:00";
-      retain = {
-        hourly = 4; # sneakily depends on startAt
-        daily = 7;
-        weekly = 4;
-        monthly = 3;
+
+      src = { host = config.krebs.hosts.xu; path = "/tmp/xu-test"; };
+      dst = { host = config.krebs.hosts.cd; path = "/tmp/backups/xu-test"; };
+
+      #startAt = "0,6,12,18:00";
+      startAt = "minutely";
+      snapshots = {
+        minutely = { format = "%Y-%m-%dT%H:%M"; retain =  5; };
+        hourly   = { format = "%Y-%m-%dT%H";    retain =  4; };
+        daily    = { format = "%Y-%m-%d";       retain =  7; };
+        weekly   = { format = "%YW%W";          retain =  4; };
+        monthly  = { format = "%Y-%m";          retain = 12; };
+        yearly   = { format = "%Y";                          };
       };
     };
     #xu-test-wu = {
@@ -41,214 +25,18 @@ let
     #};
     cd-test-xu = {
       method = "pull";
-      #src = parse.file-location cd:/tmp/cd-test;
-      #dst = parse.file-location xu:/bku/cd-test;
-      src = { user = tv; host = cd; path = "/tmp/cd-test"; };
-      dst = { user = tv; host = xu; path = "/bku/cd-test"; };
+      src = { host = config.krebs.hosts.cd; path = "/tmp/cd-test"; };
+      dst = { host = config.krebs.hosts.xu; path = "/tmp/backups/cd-test"; };
+      startAt = "minutely";
+      snapshots = {
+        minutely = { format = "%Y-%m-%dT%H:%M"; retain =  5; };
+        hourly   = { format = "%Y-%m-%dT%H";    retain =  4; };
+        daily    = { format = "%Y-%m-%d";       retain =  7; };
+        weekly   = { format = "%YW%W";          retain =  4; };
+        monthly  = { format = "%Y-%m";          retain = 12; };
+        yearly   = { format = "%Y";                          };
+      };
     };
 
   };
-
-  out = {
-    #options.krebs.backup = api;
-    config = imp;
-  };
-
-  imp = {
-    users.groups.backup.gid = genid "backup";
-    users.users = map makeUser (filter isPushDst (attrValues plans));
-    systemd.services =
-      flip mapAttrs' (filterAttrs (_:isPushSrc) plans) (name: plan: {
-        name = "backup.${name}";
-        value = makePushService plan;
-      });
-  };
-
-
-  # TODO getFQDN: admit hosts in other domains
-  getFQDN = host: "${host.name}.${config.krebs.search-domain}";
-
-  isPushSrc = plan:
-    plan.method == "push" &&
-    plan.src.host.name == config.krebs.build.host.name;
-
-  makePushService = plan: assert isPushSrc plan; {
-    startAt = plan.startAt;
-    serviceConfig.ExecStart = writeSh plan "rsync" ''
-      exec ${pkgs.rsync}/bin/rsync ${concatMapStringsSep " " shell.escape [
-        "-a"
-        "-e"
-        "${pkgs.openssh}/bin/ssh -F /dev/null -i ${plan.src.host.ssh.privkey.path}"
-        "${plan.src.path}"
-        "${plan.name}@${getFQDN plan.dst.host}::push"
-      ]}
-    '';
-  };
-
-  isPushDst = plan:
-    plan.method == "push" &&
-    plan.dst.host.name == config.krebs.build.host.name;
-
-  makeUser = plan: assert isPushDst plan; rec {
-    name = plan.name;
-    uid = genid name;
-    group = config.users.groups.backup.name;
-    home = plan.dst.path;
-    createHome = true;
-    shell = "${writeSh plan "shell" ''
-      case $2 in
-        'rsync --server --daemon .')
-          exec ${backup.rsync plan [ "--server" "--daemon" "." ]}
-          ;;
-        ''')
-          echo "ERROR: no command specified" >&2
-          exit 23
-          ;;
-        *)
-          echo "ERROR: no unknown command: $SSH_ORIGINAL_COMMAND" >&2
-          exit 23
-          ;;
-      esac
-    ''}";
-    openssh.authorizedKeys.keys = [ plan.src.host.ssh.pubkey ];
-  };
-
-  rsync = plan: args: writeSh plan "rsync" ''
-    install -v -m 0700 -d ${plan.dst.path}/push >&2
-    install -v -m 0700 -d ${plan.dst.path}/list >&2
-
-    ${pkgs.rsync}/bin/rsync \
-        --config=${backup.rsyncd-conf plan {
-          post-xfer = writeSh plan "rsyncd.post-xfer" ''
-            case $RSYNC_EXIT_STATUS in 0)
-              exec ${backup.rsnapshot plan {
-                preexec = writeSh plan "rsnapshot.preexec" ''
-                  touch ${plan.dst.path}/rsnapshot.$RSNAPSHOT_INTERVAL
-                '';
-                postexec = writeSh plan "rsnapshot.postexec" ''
-                  rm ${plan.dst.path}/rsnapshot.$RSNAPSHOT_INTERVAL
-                '';
-              }}
-            esac
-          '';
-        }} \
-        ${toString (map shell.escape args)}
-
-    fail=0
-    for i in monthly weekly daily hourly; do
-      if test -e ${plan.dst.path}/rsnapshot.$i; then
-        rm ${plan.dst.path}/rsnapshot.$i
-        echo "ERROR: $i snapshot failed" >&2
-        fail=1
-      fi
-    done
-    if test $fail != 0; then
-      exit -1
-    fi
-  '';
-
-  rsyncd-conf = plan: conf: pkgs.writeText "${plan.name}.rsyncd.conf" ''
-    fake super = yes
-    use chroot = no
-    lock file = ${plan.dst.path}/rsyncd.lock
-
-    [push]
-    max connections = 1
-    path = ${plan.dst.path}/push
-    write only = yes
-    read only = no
-    post-xfer exec = ${conf.post-xfer}
-
-    [list]
-    path = ${plan.dst.path}/list
-    read only = yes
-    write only = no
-  '';
-
-  rsnapshot = plan: conf: writeSh plan "rsnapshot" ''
-    rsnapshot() {
-      ${pkgs.proot}/bin/proot \
-          -b /bin \
-          -b /nix \
-          -b /run/current-system \
-          -b ${plan.dst.path} \
-          -r ${plan.dst.path} \
-          -w / \
-          ${pkgs.rsnapshot}/bin/rsnapshot \
-              -c ${pkgs.writeText "${plan.name}.rsnapshot.conf" ''
-                config_version	1.2
-                snapshot_root	${plan.dst.path}/list
-                cmd_cp	${pkgs.coreutils}/bin/cp
-                cmd_du	${pkgs.coreutils}/bin/du
-                #cmd_rm	${pkgs.coreutils}/bin/rm
-                cmd_rsync	${pkgs.rsync}/bin/rsync
-                cmd_rsnapshot_diff	${pkgs.rsnapshot}/bin/rsnapshot-diff
-                cmd_preexec	${conf.preexec}
-                cmd_postexec	${conf.postexec}
-                retain	hourly	4
-                retain	daily	7
-                retain	weekly	4
-                retain	monthly	3
-                lockfile	${plan.dst.path}/rsnapshot.pid
-                link_dest	1
-                backup	/push	./
-                verbose	4
-              ''} \
-          "$@"
-    }
-
-    cd ${plan.dst.path}/list/
-
-    now=$(date +%s)
-    is_older_than() {
-      test $(expr $now - $(date +%s -r $1 2>/dev/null || echo 0)) \
-       -ge $2
-    }
-
-    # TODO report stale snapshots
-    # i.e. there are $interval.$i > $interval.$max
-
-    hour_s=3600
-    day_s=86400
-    week_s=604800
-    month_s=2419200 # 4 weeks
-
-    set --
-
-    if test -e weekly.3 && is_older_than monthly.0 $month_s; then
-      set -- "$@" monthly
-    fi
-
-    if test -e daily.6 && is_older_than weekly.0 $week_s; then
-      set -- "$@" weekly
-    fi
-
-    if test -e hourly.3 && is_older_than daily.0 $day_s; then
-      set -- "$@" daily
-    fi
-
-    if is_older_than hourly.0 $hour_s; then
-      set -- "$@" hourly
-    fi
-
-
-    if test $# = 0; then
-      echo "taking no snapshots" >&2
-    else
-      echo "taking snapshots: $@" >&2
-    fi
-
-    export RSNAPSHOT_INTERVAL
-    for RSNAPSHOT_INTERVAL; do
-      rsnapshot "$RSNAPSHOT_INTERVAL"
-    done
-  '';
-
-  writeSh = plan: name: text: pkgs.writeScript "${plan.name}.${name}" ''
-    #! ${pkgs.dash}/bin/dash
-    set -efu
-    export PATH=${makeSearchPath "bin" (with pkgs; [ coreutils ])}
-    ${text}
-  '';
-
-in out
+}