krebs.backup: DRY up push and pull
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commit
071194c394
@ -58,193 +58,109 @@ let
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};
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imp = {
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users.groups.backup.gid = genid "backup";
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users.users = {}
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// {
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root.openssh.authorizedKeys.keys =
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map (plan: plan.dst.host.ssh.pubkey)
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(filter isPullSrc (attrValues cfg.plans))
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++
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map (plan: plan.src.host.ssh.pubkey)
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(filter isPushDst (attrValues cfg.plans))
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;
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}
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;
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systemd.services =
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flip mapAttrs' (filterAttrs (_:isPullDst) cfg.plans) (name: plan: {
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name = "backup.${name}";
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value = makePullService plan;
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})
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//
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flip mapAttrs' (filterAttrs (_:isPushSrc) cfg.plans) (name: plan: {
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name = "backup.${name}";
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value = makePushService plan;
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})
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;
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};
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isPushSrc = plan:
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plan.method == "push" &&
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plan.src.host.name == config.krebs.build.host.name;
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isPullSrc = plan:
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plan.method == "pull" &&
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plan.src.host.name == config.krebs.build.host.name;
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isPushDst = plan:
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plan.method == "push" &&
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plan.dst.host.name == config.krebs.build.host.name;
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isPullDst = plan:
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plan.method == "pull" &&
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plan.dst.host.name == config.krebs.build.host.name;
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# TODO push destination needs this in the dst.user's PATH
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service-path = [
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pkgs.coreutils
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pkgs.gnused
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pkgs.openssh
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pkgs.rsync
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pkgs.utillinux
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];
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listToAttrs (map (plan: nameValuePair "backup.${plan.name}" {
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# TODO if there is plan.user, then use its privkey
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makePushService = plan: assert isPushSrc plan; {
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path = service-path;
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serviceConfig = {
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ExecStart = push plan;
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# TODO push destination users need a similar path
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path = with pkgs; [
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coreutils
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gnused
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openssh
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rsync
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utillinux
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];
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serviceConfig = rec {
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ExecStart = start plan;
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SyslogIdentifier = ExecStart.name;
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Type = "oneshot";
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};
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} // optionalAttrs (plan.startAt != null) {
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inherit (plan) startAt;
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}) (filter (plan: build-host-is "pull" "dst" plan ||
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build-host-is "push" "src" plan)
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(attrValues cfg.plans)));
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users.groups.backup.gid = genid "backup";
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users.users.root.openssh.authorizedKeys.keys =
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map (plan: getAttr plan.method {
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push = plan.src.host.ssh.pubkey;
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pull = plan.dst.host.ssh.pubkey;
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}) (filter (plan: build-host-is "pull" "src" plan ||
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build-host-is "push" "dst" plan)
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(attrValues cfg.plans));
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};
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makePullService = plan: assert isPullDst plan; {
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path = service-path;
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serviceConfig = {
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ExecStart = pull plan;
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Type = "oneshot";
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};
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} // optionalAttrs (plan.startAt != null) {
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inherit (plan) startAt;
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};
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build-host-is = method: side: plan:
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plan.method == method &&
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config.krebs.build.host.name == plan.${side}.host.name;
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push = plan: let
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# We use pkgs.writeDashBin and return the absolute path so systemd will
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# produce nice names in the log, i.e. without the Nix store hash.
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out = "${main}/bin/${main.name}";
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main = pkgs.writeDashBin "backup.${plan.name}.push" ''
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set -efu
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dst=${shell.escape plan.dst.path}
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mkdir -m 0700 -p "$dst"
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exec flock -n "$dst" ${critical-section}
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'';
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critical-section = pkgs.writeDash "backup.${plan.name}.push.critical-section" ''
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# TODO check if there is a previous
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start = plan: pkgs.writeDash "backup.${plan.name}" ''
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set -efu
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${getAttr plan.method {
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push = ''
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identity=${shell.escape plan.src.host.ssh.privkey.path}
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src=${shell.escape plan.src.path}
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src_path=${shell.escape plan.src.path}
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src=$src_path
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dst_user=root
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dst_host=$(${fastest-address plan.dst.host})
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dst_port=$(${network-ssh-port plan.dst.host "$dst_host"})
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dst_path=${shell.escape plan.dst.path}
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dst=$dst_user@$dst_host:$dst_path
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# Export NOW so runtime of rsync doesn't influence snapshot naming.
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export NOW
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NOW=$(date +%s)
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echo >&2 "update snapshot: current; $src -> $dst"
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rsync >&2 \
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-aAXF --delete \
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-e "ssh -F /dev/null -i $identity ''${dst_port:+-p $dst_port}" \
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--rsync-path ${shell.escape
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"mkdir -m 0700 -p ${shell.escape plan.dst.path}/current && rsync"} \
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--link-dest="$dst_path/current" \
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"$src/" \
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"$dst/.partial"
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echo "update snapshot: current; $src -> $dst" >&2
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dst_shell() {
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exec ssh -F /dev/null \
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-i "$identity" \
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''${dst_port:+-p $dst_port} \
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"$dst_user@$dst_host" \
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-T \
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env NOW="$NOW" /bin/sh < ${remote-snapshot}
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-T "$with_dst_path_lock_script"
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}
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'';
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remote-snapshot = pkgs.writeDash "backup.${plan.name}.push.remote-snapshot" ''
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set -efu
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dst=${shell.escape plan.dst.path}
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if test -e "$dst/current"; then
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mv "$dst/current" "$dst/.previous"
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fi
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mv "$dst/.partial" "$dst/current"
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rm -fR "$dst/.previous"
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echo >&2
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(${(take-snapshots plan).text})
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'';
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in out;
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# TODO admit plan.dst.user and its ssh identity
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pull = plan: let
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# We use pkgs.writeDashBin and return the absolute path so systemd will
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# produce nice names in the log, i.e. without the Nix store hash.
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out = "${main}/bin/${main.name}";
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main = pkgs.writeDashBin "backup.${plan.name}.pull" ''
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set -efu
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dst=${shell.escape plan.dst.path}
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mkdir -m 0700 -p "$dst"
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exec flock -n "$dst" ${critical-section}
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'';
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critical-section = pkgs.writeDash "backup.${plan.name}.pull.critical-section" ''
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# TODO check if there is a previous
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set -efu
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pull = ''
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identity=${shell.escape plan.dst.host.ssh.privkey.path}
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src_user=root
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src_host=$(${fastest-address plan.src.host})
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src_port=$(${network-ssh-port plan.src.host "$src_host"})
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src_path=${shell.escape plan.src.path}
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src=$src_user@$src_host:$src_path
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dst=${shell.escape plan.dst.path}
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# Export NOW so runtime of rsync doesn't influence snapshot naming.
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export NOW
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NOW=$(date +%s)
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echo >&2 "update snapshot: current; $dst <- $src"
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mkdir -m 0700 -p ${shell.escape plan.dst.path}
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dst_path=${shell.escape plan.dst.path}
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dst=$dst_path
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echo "update snapshot: current; $dst <- $src" >&2
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dst_shell() {
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eval "$with_dst_path_lock_script"
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}
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'';
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}}
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# Note that this only works because we trust date +%s to produce output
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# that doesn't need quoting when used to generate a command string.
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# TODO relax this requirement by selectively allowing to inject variables
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# e.g.: ''${shell.quote "exec env NOW=''${shell.unquote "$NOW"} ..."}
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with_dst_path_lock_script="exec env start_date=$(date +%s) "${shell.escape
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"flock -n ${shell.escape plan.dst.path} /bin/sh"
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}
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rsync >&2 \
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-aAXF --delete \
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-e "ssh -F /dev/null -i $identity ''${src_port:+-p $src_port}" \
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--link-dest="$dst/current" \
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-e "ssh -F /dev/null -i $identity ''${dst_port:+-p $dst_port}" \
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--rsync-path ${shell.escape (concatStringsSep " && " [
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"mkdir -m 0700 -p ${shell.escape plan.dst.path}/current"
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"exec flock -n ${shell.escape plan.dst.path} rsync"
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])} \
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--link-dest="$dst_path/current" \
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"$src/" \
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"$dst/.partial"
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dst_shell < ${toFile "backup.${plan.name}.take-snapshots" ''
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set -efu
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: $start_date
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dst=${shell.escape plan.dst.path}
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mv "$dst/current" "$dst/.previous"
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mv "$dst/.partial" "$dst/current"
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rm -fR "$dst/.previous"
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echo >&2
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exec ${take-snapshots plan}
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'';
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in out;
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take-snapshots = plan: pkgs.writeDash "backup.${plan.name}.take-snapshots" ''
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set -efu
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NOW=''${NOW-$(date +%s)}
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dst=${shell.escape plan.dst.path}
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snapshot() {(
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: $ns $format $retain
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name=$(date --date="@$NOW" +"$format")
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name=$(date --date="@$start_date" +"$format")
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if ! test -e "$dst/$ns/$name"; then
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echo >&2 "create snapshot: $ns/$name"
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mkdir -m 0700 -p "$dst/$ns"
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@ -272,7 +188,7 @@ let
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esac
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)}
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${concatStringsSep "\n" (mapAttrsToList (ns: { format, retain ? null, ... }:
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${concatStringsSep "\n" (mapAttrsToList (ns: { format, retain, ... }:
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toString (map shell.escape [
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"ns=${ns}"
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"format=${format}"
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@ -280,6 +196,7 @@ let
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"snapshot"
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]))
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plan.snapshots)}
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''}
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'';
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# XXX Is one ping enough to determine fastest address?
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