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|
{
description = "Rsync backups";
outputs = { self }: {
nixosModule = { lib, pkgs, config, ... }: {
options.services.rsyncBackup = {
mountpoint = lib.mkOption {
type = lib.types.path;
description = "Path to the base folder for backups";
};
profiles = lib.mkOption {
type = lib.types.attrsOf (lib.types.submodule {
options = {
keep = lib.mkOption {
type = lib.types.int;
default = 7;
description = ''
Number of backups to keep
'';
};
check_command = lib.mkOption {
type = lib.types.str;
default = "backup";
description = ''
command to check if backup needs to be done
'';
};
login = lib.mkOption {
type = lib.types.str;
description = ''
login to connect to
'';
};
host = lib.mkOption {
type = lib.types.str;
description = ''
host to connect to
'';
};
port = lib.mkOption {
type = lib.types.str;
default = "22";
description = ''
port to connect to
'';
};
host_key = lib.mkOption {
type = lib.types.str;
description = ''
Host key to use as known host
'';
};
host_key_type = lib.mkOption {
type = lib.types.str;
description = ''
Host key type
'';
};
parts = lib.mkOption {
type = lib.types.attrsOf (lib.types.submodule {
options = {
remote_folder = lib.mkOption {
type = lib.types.path;
description = ''
Path to backup
'';
};
exclude_from = lib.mkOption {
type = lib.types.listOf lib.types.path;
default = [];
description = ''
Paths to exclude from the backup
'';
};
files_from = lib.mkOption {
type = lib.types.listOf lib.types.path;
default = [];
description = ''
Paths to take for the backup
(if empty: whole folder minus exclude_from)
'';
};
args = lib.mkOption {
type = lib.types.nullOr lib.types.str;
default = null;
description = ''
additional arguments for rsync
'';
};
};
});
description = ''
folders to backup in the host
'';
};
};
});
default = {};
description = ''
Profiles to backup
'';
};
ssh_key_public = lib.mkOption {
type = lib.types.str;
description = "Public key for the backup";
};
ssh_key_private = lib.mkOption {
type = lib.types.str;
description = "Private key for the backup";
};
};
config =
let
cfg = config.services.rsyncBackup;
in
lib.mkIf (builtins.length (builtins.attrNames cfg.profiles) > 0) {
users.users.backup = {
isSystemUser = true;
uid = config.ids.uids.backup;
group = "backup";
extraGroups = [ "keys" ];
};
users.groups.backup = {
gid = config.ids.gids.backup;
};
services.cron.systemCronJobs = let
ssh_key = cfg.ssh_key_private;
backup_head = ''
#!${pkgs.stdenv.shell}
EXCL_FROM=`mktemp`
FILES_FROM=`mktemp`
TMP_STDERR=`mktemp`
on_exit() {
if [ -s "$TMP_STDERR" ]; then
cat "$TMP_STDERR"
fi
rm -f $TMP_STDERR $EXCL_FROM $FILES_FROM
}
trap "on_exit" EXIT
exec 2> "$TMP_STDERR"
exec < /dev/null
set -e
'';
backup_profile_head = name: profile: ''
##### ${name} #####
PORT="${profile.port}"
DEST="${profile.login}@${profile.host}"
BASE="${cfg.mountpoint}/${name}"
OLD_BAK_BASE=$BASE/older/j
BAK_BASE=''${OLD_BAK_BASE}0
RSYNC_OUTPUT=$BASE/rsync_output
NBR=${builtins.toString profile.keep}
if ! ssh \
-o PreferredAuthentications=publickey \
-o StrictHostKeyChecking=yes \
-o ClearAllForwardings=yes \
-o UserKnownHostsFile=/dev/null \
-o CheckHostIP=no \
-p $PORT \
-i ${ssh_key} \
$DEST ${profile.check_command}; then
echo "Fichier de verrouillage backup sur $DEST ou impossible de se connecter" >&2
skip=$DEST
fi
rm -rf ''${OLD_BAK_BASE}''${NBR}
for j in `seq -w $(($NBR-1)) -1 0`; do
[ ! -d ''${OLD_BAK_BASE}$j ] && continue
mv ''${OLD_BAK_BASE}$j ''${OLD_BAK_BASE}$(($j+1))
done
mkdir $BAK_BASE
mv $RSYNC_OUTPUT $BAK_BASE
mkdir $RSYNC_OUTPUT
if [ "$skip" != "$DEST" ]; then
'';
backup_profile_tail = name: profile: ''
ssh -o UserKnownHostsFile=/dev/null -o CheckHostIP=no -i ${ssh_key} -p $PORT $DEST sh -c "date > .cache/last_backup" || true
fi # [ "$skip" != "$DEST" ]
##### End ${name} #####
'';
backup_part = profile_name: part_name: part: ''
### ${profile_name} ${part_name} ###
LOCAL="${part_name}"
REMOTE="${part.remote_folder}"
if [ ! -d "$BASE/$LOCAL" ]; then
mkdir $BASE/$LOCAL
fi
cd $BASE/$LOCAL
cat > $EXCL_FROM <<EOF
${builtins.concatStringsSep "\n" part.exclude_from}
EOF
cat > $FILES_FROM <<EOF
${builtins.concatStringsSep "\n" part.files_from}
EOF
OUT=$RSYNC_OUTPUT/$LOCAL
${pkgs.rsync}/bin/rsync --new-compress -XAavbr --fake-super -e "ssh -o UserKnownHostsFile=/dev/null -o CheckHostIP=no -i ${ssh_key} -p $PORT" --numeric-ids --delete \
--backup-dir=$BAK_BASE/$LOCAL \${
lib.optionalString (part.args != null) "\n ${part.args} \\"}${
lib.optionalString (builtins.length part.exclude_from > 0) "\n --exclude-from=$EXCL_FROM \\"}${
lib.optionalString (builtins.length part.files_from > 0) "\n --files-from=$FILES_FROM \\"}
$DEST:$REMOTE . > $OUT || true
### End ${profile_name} ${part_name} ###
'';
backup_profile = name: profile: builtins.concatStringsSep "\n" (
[(backup_profile_head name profile)]
++ lib.mapAttrsToList (backup_part name) profile.parts
++ [(backup_profile_tail name profile)]);
backup = pkgs.writeScript "backup.sh" (builtins.concatStringsSep "\n" ([
backup_head
] ++ lib.mapAttrsToList backup_profile cfg.profiles));
in [
''
25 3,15 * * * backup ${backup}
''
];
programs.ssh.knownHosts = lib.attrsets.mapAttrs' (name: profile: lib.attrsets.nameValuePair name {
extraHostNames = [ profile.host ];
publicKey = "${profile.host_key_type} ${profile.host_key}";
}) cfg.profiles;
system.activationScripts.rsyncBackup = {
deps = [ "users" ];
text = builtins.concatStringsSep "\n" (map (v: ''
install -m 0700 -o backup -g backup -d ${cfg.mountpoint}/${v} ${cfg.mountpoint}/${v}/older ${cfg.mountpoint}/${v}/rsync_output
'') (builtins.attrNames cfg.profiles)
);
};
};
};
};
}
|
