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Add more options to the rsync backup method

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New options:

  * `localdir`: Override the local directory

  * `services`: Depend on other services.
This commit is contained in:
Peter Jones 2019-10-02 14:05:11 -07:00
parent 755cc2a84b
commit 1c1ede78a6
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GPG key ID: 9DAFAA8D01941E49
2 changed files with 38 additions and 16 deletions
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49
modules/backup/rsync.nix
View file

@ -3,13 +3,19 @@
let
cfg = config.phoebe.backup.rsync;
cdir = config.phoebe.backup.directory;
plib = config.phoebe.lib;
user = "backup";
port = builtins.head config.services.openssh.ports;
scripts = (import ../../pkgs/default.nix { inherit pkgs; }).backup-scripts;
##############################################################################
# Sanitize the name of a directory.
dir = path: replaceStrings ["/"] ["-"] (removePrefix "/" path);
##############################################################################
# Backup options.
backupOpts = {
backupOpts = { config, ... }: {
options = {
host = mkOption {
type = types.str;
@ -19,7 +25,7 @@ let
port = mkOption {
type = types.ints.positive;
default = builtins.head config.services.openssh.ports;
default = port;
example = 22;
description = "SSH port on the remote machine.";
};
@ -38,6 +44,12 @@ let
description = "Remote directory to sync to the local machine.";
};
localdir = mkOption {
type = types.path;
example = "/var/lib/backup/rsync";
description = "Local directory where files are synced to.";
};
key = mkOption {
type = types.nullOr types.path;
default = null;
@ -69,12 +81,23 @@ let
example = 14;
description = "Number of backups to keep when deleting older backups.";
};
services = mkOption {
type = types.listOf types.str;
default = [ ];
example = [ "foo.service" ];
description = ''
Extra services to require and wait for. Useful if you want
to require certain systemd mounts to exist.
'';
};
};
##############################################################################
# Sanitize the name of a directory.
dir = path: replaceStrings ["/"] ["-"] (removePrefix "/" path);
config = {
localdir =
mkDefault "${cdir}/rsync/${config.host}/${dir config.directory}";
};
};
##############################################################################
# Generate a service/timer name (without the suffix):
@ -83,12 +106,10 @@ let
##############################################################################
# Generate a systemd service for a backup.
service = opts:
let base = "${config.phoebe.backup.directory}/rsync";
localdir = "${base}/${opts.host}/${dir opts.directory}";
in rec {
rec {
description = "rsync backup for ${opts.host}:${opts.directory}";
path = [ pkgs.coreutils scripts ];
wants = plib.keyService opts.key;
wants = plib.keyService opts.key ++ opts.services;
after = wants;
serviceConfig = {
@ -98,9 +119,9 @@ let
};
preStart = ''
mkdir -p "${localdir}"
chown -R ${cfg.user}:${cfg.group} "${localdir}"
chmod -R 0700 "${localdir}"
mkdir -p "${opts.localdir}"
chown -R ${cfg.user}:${cfg.group} "${opts.localdir}"
chmod -R 0700 "${opts.localdir}"
'';
script = ''
@ -109,8 +130,8 @@ let
export BACKUP_SSH_KEY=${toString opts.key}
export BACKUP_SSH_PORT=${toString opts.port}
. "${scripts}/lib/backup.sh"
backup_via_rsync "${opts.user}@${opts.host}:${opts.directory}" "${localdir}"
backup-purge.sh -k "${toString opts.keep}" -d "${localdir}"
backup_via_rsync "${opts.user}@${opts.host}:${opts.directory}" "${opts.localdir}"
backup-purge.sh -k "${toString opts.keep}" -d "${opts.localdir}"
'';
};

1
test/backup/rsync/default.nix
View file

@ -25,6 +25,7 @@ pkgs.nixosTest {
directory = "/tmp/backup";
user = "root";
key = "/tmp/key";
services = [ "sshd.service" ];
}
];
};