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[Podman] Supports SQLite containers database back-end to support newe…
…r versions (4.8+) (#24373) * go import + licenses + release note * sqlite client + modifies wlm podman init * new podman detection and config * Doc suggestion on release note formatting Co-authored-by: Alicia Scott <[email protected]> * Use pure-go SQLite driver instead of CGo implementatioon * Increase max_dsd binary size to 42 MB --------- Co-authored-by: Alicia Scott <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| // Unless explicitly stated otherwise all files in this repository are licensed | ||
| // under the Apache License Version 2.0. | ||
| // This product includes software developed at Datadog (https://www.datadoghq.com/). | ||
| // Copyright 2016-present Datadog, Inc. | ||
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| //go:build podman | ||
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| package podman | ||
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| import ( | ||
| "database/sql" | ||
| "encoding/json" | ||
| "fmt" | ||
| "path/filepath" | ||
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| // SQLite backend for database/sql | ||
| _ "modernc.org/sqlite" | ||
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| "github.com/DataDog/datadog-agent/pkg/util/log" | ||
| ) | ||
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| // Same strategy as for BoltDB : we do not need the full podman go package. | ||
| // This reduces the number of dependencies and the size of the ultimately shipped binary. | ||
| // | ||
| // The functions in this file have been copied from | ||
| // https://github.com/containers/podman/blob/v5.0.0/libpod/sqlite_state.go | ||
| // The code has been adapted a bit to our needs. The only functions of that file | ||
| // that we need are AllContainers() and NewSqliteState(). | ||
| // | ||
| // This code could break in future versions of Podman. This has been tried with | ||
| // v4.9.2 and v5.0.0. | ||
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| // SQLDBClient is a client for the podman's state database in the SQLite format. | ||
| type SQLDBClient struct { | ||
| DBPath string | ||
| } | ||
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| const ( | ||
| // Deal with timezone automatically. | ||
| sqliteOptionLocation = "_loc=auto" | ||
| // Read-only mode (https://www.sqlite.org/pragma.html#pragma_query_only) | ||
| sqliteOptionQueryOnly = "&_query_only=true" | ||
| // Make sure busy timeout is set to high value to keep retrying when the db is locked. | ||
| // Timeout is in ms, so set it to 100s to have enough time to retry the operations. | ||
| sqliteOptionBusyTimeout = "&_busy_timeout=100000" | ||
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| // Assembled sqlite options used when opening the database. | ||
| sqliteOptions = "?" + sqliteOptionLocation + sqliteOptionQueryOnly + sqliteOptionBusyTimeout | ||
| ) | ||
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| // NewSQLDBClient returns a DB client that uses the DB stored in dbPath. | ||
| func NewSQLDBClient(dbPath string) *SQLDBClient { | ||
| return &SQLDBClient{ | ||
| DBPath: dbPath, | ||
| } | ||
| } | ||
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| // getDBCon opens a connection to the SQLite-backed state database. | ||
| // Note: original function comes from https://github.com/containers/podman/blob/e71ec6f1d94d2d97fb3afe08aae0d8adaf8bddf0/libpod/sqlite_state.go#L57-L96 | ||
| // It was adapted as we don't need to write any information to the DB. | ||
| func (client *SQLDBClient) getDBCon() (*sql.DB, error) { | ||
| conn, err := sql.Open("sqlite", filepath.Join(client.DBPath, sqliteOptions)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("opening sqlite database: %w", err) | ||
| } | ||
| return conn, nil | ||
| } | ||
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| // GetAllContainers retrieves all the containers in the database. | ||
| // We retrieve the state always. | ||
| func (client *SQLDBClient) GetAllContainers() ([]Container, error) { | ||
| var res []Container | ||
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| conn, err := client.getDBCon() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer func() { | ||
| if errClose := conn.Close(); errClose != nil { | ||
| log.Warnf("failed to close sqlite db: %q", err) | ||
| } | ||
| }() | ||
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| rows, err := conn.Query("SELECT ContainerConfig.JSON, ContainerState.JSON AS StateJSON FROM ContainerConfig INNER JOIN ContainerState ON ContainerConfig.ID = ContainerState.ID;") | ||
| if err != nil { | ||
| return nil, fmt.Errorf("retrieving all containers from database: %w", err) | ||
| } | ||
| defer rows.Close() | ||
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| for rows.Next() { | ||
| var configJSON, stateJSON string | ||
| if err := rows.Scan(&configJSON, &stateJSON); err != nil { | ||
| return nil, fmt.Errorf("scanning container from database: %w", err) | ||
| } | ||
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| ctr := new(Container) | ||
| ctr.Config = new(ContainerConfig) | ||
| ctr.State = new(ContainerState) | ||
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| if err := json.Unmarshal([]byte(configJSON), ctr.Config); err != nil { | ||
| return nil, fmt.Errorf("unmarshalling container config: %w", err) | ||
| } | ||
| if err := json.Unmarshal([]byte(stateJSON), ctr.State); err != nil { | ||
| return nil, fmt.Errorf("unmarshalling container %s state: %w", ctr.Config.ID, err) | ||
| } | ||
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| res = append(res, *ctr) | ||
| } | ||
| if err := rows.Err(); err != nil { | ||
| return nil, err | ||
| } | ||
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| return res, nil | ||
| } |
6 changes: 6 additions & 0 deletions
6
releasenotes/notes/podman-sqlite-backend-support-8437c6d5254b39ef.yaml
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| --- | ||
| enhancements: | ||
| - | | ||
| Supports Podman newer versions (4.8+) using SQLite instead of BoltDB for the containers database backend. | ||
| Setting ``podman_db_path`` to the path with the ``db.sql`` file (e.g. ``/var/lib/containers/storage/db.sql``) will make the Datadog Agent use the SQLite format. | ||
| **Note**: If ``podman_db_path`` is not set (default), the Datadog Agent attempts to use the default file ``libpod/bolt_state.db`` and ``db.sql`` from ``/var/lib/containers/storage``. |
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