forked from clan/clan-core
backup: add a way to stop services before restoring a state.
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0dc3b9f056
commit
5c11a30b46
@ -11,8 +11,19 @@
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];
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clan.postgresql.users.test = { };
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clan.postgresql.databases.test.create.options.OWNER = "test";
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clan.postgresql.databases.test.restore.stopOnRestore = [ "sample-service" ];
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clan.localbackup.targets.hdd.directory = "/mnt/external-disk";
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systemd.services.sample-service = {
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wantedBy = [ "multi-user.target" ];
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script = ''
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while true; do
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echo "Hello, world!"
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sleep 5
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done
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'';
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};
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environment.systemPackages = [ config.services.postgresql.package ];
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};
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testScript =
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@ -20,20 +31,22 @@
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''
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start_all()
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machine.wait_for_unit("postgresql")
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machine.wait_for_unit("sample-service")
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# Create a test table
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machine.succeed("runuser -u postgres -- /run/current-system/sw/bin/psql -c 'CREATE TABLE test (id serial PRIMARY KEY);' test")
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machine.succeed("/run/current-system/sw/bin/localbackup-create >&2")
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timestamp_before = int(machine.succeed("systemctl show --property=ExecMainStartTimestampMonotonic sample-service | cut -d= -f2").strip())
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machine.succeed("test -e /mnt/external-disk/snapshot.0/machine/var/backup/postgres/test/dump.sql.zstd || { echo 'dump.sql.zstd not found'; exit 1; }")
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machine.succeed("test -e /mnt/external-disk/snapshot.0/machine/var/backup/postgres/test/pg-dump || { echo 'pg-dump not found'; exit 1; }")
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machine.succeed("runuser -u postgres -- /run/current-system/sw/bin/psql -d test -c 'INSERT INTO test DEFAULT VALUES;'")
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machine.succeed("runuser -u postgres -- /run/current-system/sw/bin/psql -d test -c 'DROP TABLE test;'")
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machine.succeed("test -e /var/backup/postgres/test/dump.sql.zstd || { echo 'backup.info not found'; exit 1; }")
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machine.succeed("test -e /var/backup/postgres/test/pg-dump || { echo 'pg-dump not found'; exit 1; }")
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machine.succeed("rm -rf /var/backup/postgres")
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machine.succeed("NAME=/mnt/external-disk/snapshot.0 FOLDERS=/var/backup/postgres/test /run/current-system/sw/bin/localbackup-restore >&2")
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machine.succeed("test -e /var/backup/postgres/test/dump.sql.zstd || { echo 'backup.info not found'; exit 1; }")
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machine.succeed("test -e /var/backup/postgres/test/pg-dump || { echo 'pg-dump not found'; exit 1; }")
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machine.succeed("""
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set -x
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@ -42,6 +55,9 @@
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machine.succeed("runuser -u postgres -- /run/current-system/sw/bin/psql -l >&2")
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machine.succeed("runuser -u postgres -- /run/current-system/sw/bin/psql -d test -c '\dt' >&2")
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timestamp_after = int(machine.succeed("systemctl show --property=ExecMainStartTimestampMonotonic sample-service | cut -d= -f2").strip())
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assert timestamp_before < timestamp_after, f"{timestamp_before} >= {timestamp_after}: expected sample-service to be restarted after restore"
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# Check that the table is still there
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machine.succeed("runuser -u postgres -- /run/current-system/sw/bin/psql -d test -c 'SELECT * FROM test;'")
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output = machine.succeed("runuser -u postgres -- /run/current-system/sw/bin/psql --csv -c \"SELECT datdba::regrole FROM pg_database WHERE datname = 'test'\"")
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@ -9,7 +9,8 @@ let
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db:
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let
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folder = "/var/backup/postgres/${db.name}";
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current = "${folder}/dump.sql.zstd";
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current = "${folder}/pg-dump";
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compression = lib.optionalString (lib.versionAtLeast config.services.postgresql.package.version "16") "--compress=zstd";
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in
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{
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folders = [ folder ];
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@ -28,10 +29,9 @@ let
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done
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mkdir -p "${folder}"
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runuser -u postgres -- pg_dump --compress=zstd --dbname=${db.name} -Fc -c > "${current}.tmp"
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runuser -u postgres -- pg_dump ${compression} --dbname=${db.name} -Fc -c > "${current}.tmp"
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mv "${current}.tmp" ${current}
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'';
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postRestoreCommand = ''
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export PATH=${
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lib.makeBinPath [
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@ -52,10 +52,14 @@ let
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done
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if [[ -e "${current}" ]]; then
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umask 077 # only root can read the backup
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(
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systemctl stop ${lib.concatStringsSep " " db.restore.stopOnRestore}
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trap "systemctl start ${lib.concatStringsSep " " db.restore.stopOnRestore}" EXIT
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mkdir -p "${folder}"
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runuser -u postgres -- dropdb "${db.name}"
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runuser -u postgres -- pg_restore -C -d postgres "${current}"
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)
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else
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echo No database backup found, skipping restore
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fi
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@ -111,10 +115,10 @@ in
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OWNER = "foo";
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};
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};
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backup.enable = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = "Backup the database.";
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restore.stopOnRestore = lib.mkOption {
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type = lib.types.listOf lib.types.str;
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default = [ ];
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description = "List of services to stop before restoring the database.";
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};
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};
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}
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@ -33,6 +33,18 @@
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e.g. a database dump
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'';
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};
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# TODO: implement this
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#stopOnRestore = lib.mkOption {
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# type = lib.types.listOf lib.types.str;
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# default = [];
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# description = ''
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# List of services to stop before restoring the state dir from a backup
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# Utilize this to stop services which currently access these folders or or other services affected by the restore
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# '';
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#};
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preRestoreCommand = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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@ -42,6 +54,7 @@
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Utilize this to stop services which currently access these folders
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'';
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};
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postRestoreCommand = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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