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backup: add a way to stop services before restoring a state.

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This commit is contained in:
Jörg Thalheim
2024-06-06 15:17:47 +02:00
parent 0dc3b9f056
commit 5c11a30b46
3 changed files with 47 additions and 14 deletions
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26
clanModules/postgresql/default.nix
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@@ -9,7 +9,8 @@ let
db:
let
folder = "/var/backup/postgres/${db.name}";
current = "${folder}/dump.sql.zstd";
current = "${folder}/pg-dump";
compression = lib.optionalString (lib.versionAtLeast config.services.postgresql.package.version "16") "--compress=zstd";
in
{
folders = [ folder ];
@@ -28,10 +29,9 @@ let
done
mkdir -p "${folder}"
runuser -u postgres -- pg_dump --compress=zstd --dbname=${db.name} -Fc -c > "${current}.tmp"
runuser -u postgres -- pg_dump ${compression} --dbname=${db.name} -Fc -c > "${current}.tmp"
mv "${current}.tmp" ${current}
'';
postRestoreCommand = ''
export PATH=${
lib.makeBinPath [
@@ -52,10 +52,14 @@ let
done
if [[ -e "${current}" ]]; then
umask 077 # only root can read the backup
mkdir -p "${folder}"
runuser -u postgres -- dropdb "${db.name}"
runuser -u postgres -- pg_restore -C -d postgres "${current}"
(
systemctl stop ${lib.concatStringsSep " " db.restore.stopOnRestore}
trap "systemctl start ${lib.concatStringsSep " " db.restore.stopOnRestore}" EXIT
mkdir -p "${folder}"
runuser -u postgres -- dropdb "${db.name}"
runuser -u postgres -- pg_restore -C -d postgres "${current}"
)
else
echo No database backup found, skipping restore
fi
@@ -111,10 +115,10 @@ in
OWNER = "foo";
};
};
backup.enable = lib.mkOption {
type = lib.types.bool;
default = true;
description = "Backup the database.";
restore.stopOnRestore = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [ ];
description = "List of services to stop before restoring the database.";
};
};
}