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|
{ lib, pkgs, config, name, ... }:
let
cfg = config.myEnv.borg_backup;
varDir = "/var/lib/borgbackup";
borg_args = "--encryption repokey --make-parent-dirs init create prune compact check";
borg_backup_full_with_ignored = pkgs.writeScriptBin "borg_full_with_ignored" ''
#!${pkgs.stdenv.shell}
if [ -z "$1" -o "$1" = "-h" -o "$1" = "--help" ]; then
echo "borg_full_with_ignored /path/to/borgmatic.yaml"
echo "Does a full backup including directories with .duplicity-ignore"
exit 1
fi
${pkgs.borgmatic}/bin/borgmatic -c "$1" --override 'storage.archive_name_format="{hostname}-with-ignored-{now:%Y-%m-%dT%H:%M:%S.%f}"' --override 'location.exclude_if_present=[]' ${borg_args}
'';
borg_backup = pkgs.writeScriptBin "borg_backup" ''
#!${pkgs.stdenv.shell}
declare -a profiles
profiles=()
${builtins.concatStringsSep "\n" (lib.flatten (lib.mapAttrsToList (k: v: map (remote: [
''profiles+=("${remote}_${k}")''
]) v.remotes) config.services.borgBackup.profiles))}
if [ -f "${varDir}/last_backup_profile" ]; then
last_backup=$(cat ${varDir}/last_backup_profile)
for i in "''${!profiles[@]}"; do
if [[ "''${profiles[$i]}" = "$last_backup" ]]; then
break
fi
done
((i+=1))
profiles=("''${profiles[@]:$i}" "''${profiles[@]:0:$i}")
fi
# timeout in minutes
timeout="''${1:-180}"
timeout_timestamp=$(date +%s -d "$timeout minutes")
for profile in "''${profiles[@]}"; do
if [ $(date +%s -d "now") -ge "$timeout_timestamp" ]; then
break
fi
touch "${varDir}/$profile.log"
${pkgs.borgmatic}/bin/borgmatic -c "${config.secrets.location}/borg_backup/$profile/borgmatic.yaml" ${borg_args} >> ${varDir}/$profile.log
[[ $? = 0 ]] || echo -e "Error when doing backup for $profile, see above or logs in ${varDir}/$profile.log\n---------------------------------------" >&2
echo "$profile" > ${varDir}/last_backup_profile
done
'';
check_backups = pkgs.writeScriptBin "borg_list_not_backuped" ''
#!${pkgs.stdenv.shell}
do_check() {
local dir="$1" path ignored_path
find "$dir" -mindepth 1 -maxdepth 1 | while IFS= read -r path; do
if ${pkgs.gnugrep}/bin/grep -qFx "$path" ${config.secrets.fullPaths."borg_backup/backuped_list"}; then
continue
elif ${pkgs.gnugrep}/bin/grep -q "^$path/" ${config.secrets.fullPaths."borg_backup/backuped_list"}; then
do_check "$path"
else
while IFS= read -r ignored_path; do
if [[ "$path" =~ ^$ignored_path$ ]]; then
continue 2
fi
done < ${config.secrets.fullPaths."borg_backup/ignored_list"}
printf '%s\n' "$path"
fi
done
}
do_check /var/lib
'';
borgProfile = profile: remote: bucket: builtins.toJSON {
location = {
source_directories = map (p: "${profile.rootDir}/${p}") profile.includedPaths;
repositories = [
{ path = cfg.remotes.${remote}.remote bucket; label = "backupserver"; }
];
one_file_system = false;
exclude_if_present = [".duplicity-ignore"];
source_directories_must_exist = profile.directoriesMustExist;
borgmatic_source_directory = "${varDir}/${profile.bucket}/.borgmatic";
};
storage = {
encryption_passphrase = profile.password;
ssh_command = "ssh -i ${config.secrets.fullPaths."borg_backup/identity"}";
compression = "zlib";
borg_base_directory = "${varDir}/${profile.bucket}";
};
retention = {
keep_within = "10d";
keep_daily = 30;
};
};
in
{
options = {
services.borgBackup.enable = lib.mkOption {
type = lib.types.bool;
default = false;
description = ''
Whether to enable remote backups.
'';
};
services.borgBackup.profiles = lib.mkOption {
type = lib.types.attrsOf (lib.types.submodule {
options = {
hash = lib.mkOption {
type = lib.types.bool;
default = true;
description = ''
Hash bucket and directory names
'';
};
rootDir = lib.mkOption {
type = lib.types.path;
default = "/var/lib";
description = ''
Path to backup
'';
};
password = lib.mkOption {
type = lib.types.str;
default = cfg.password;
description = ''
password to use to encrypt data
'';
};
directoriesMustExist = lib.mkOption {
type = lib.types.bool;
default = true;
description = ''
Raise error if backuped directory doesn't exist
'';
};
bucket = lib.mkOption {
type = lib.types.str;
description = ''
Bucket to use
'';
};
remotes = lib.mkOption {
type = lib.types.listOf lib.types.str;
description = ''
Remotes to use for backup
'';
};
includedPaths = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [];
description = ''
Included paths (subdirs of rootDir)
'';
};
excludeFile = lib.mkOption {
type = lib.types.lines;
default = "";
description = ''
Content to put in exclude file
'';
};
ignoredPaths = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [];
description = ''
List of paths to ignore when checking non-backed-up directories
Can use (POSIX extended) regex
'';
};
};
});
};
};
config = lib.mkIf config.services.borgBackup.enable {
system.activationScripts.borg_backup = ''
install -m 0700 -o root -g root -d ${varDir}
'';
secrets.keys = lib.listToAttrs (lib.flatten (lib.mapAttrsToList (k: v:
let
bucket = if v.hash or true then builtins.hashString "sha256" v.bucket else v.bucket;
in map (remote: [
(lib.nameValuePair "borg_backup/${remote}_${k}/borgmatic.yaml" {
permissions = "0400";
text = borgProfile v remote bucket;
})
(lib.nameValuePair "borg_backup/${remote}_${k}" {
permissions = "0700";
isDir = true;
})
]) v.remotes) config.services.borgBackup.profiles)) // {
"borg_backup/identity" = {
permissions = "0400";
text = "{{ .ssl_keys.borg_backup }}";
};
"borg_backup/ignored_list" = {
permissions = "0400";
text = let
ignored = map
(v: map (p: "${v.rootDir}/${p}") v.ignoredPaths)
(builtins.attrValues config.services.borgBackup.profiles);
in builtins.concatStringsSep "\n" (lib.flatten ignored);
};
"borg_backup/backuped_list" = {
permissions = "0400";
text = let
included = map
(v: map (p: "${v.rootDir}/${p}") v.includedPaths)
(builtins.attrValues config.services.borgBackup.profiles);
in builtins.concatStringsSep "\n" (lib.flatten included);
};
};
programs.ssh.knownHostsFiles = [
(pkgs.writeText
"borg_backup_known_hosts"
(builtins.concatStringsSep
"\n"
(builtins.filter
(v: v != null)
(builtins.map
(v: v.sshKnownHosts)
(builtins.attrValues cfg.remotes)
)
)
)
)
];
environment.systemPackages = [ pkgs.borgbackup pkgs.borgmatic borg_backup_full_with_ignored borg_backup check_backups ];
services.cron = {
enable = true;
systemCronJobs = [
"0 0 * * * root ${borg_backup}/bin/borg_backup 300"
];
};
};
}
|
