365 lines
15 KiB
Scheme
365 lines
15 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017, 2019 Caleb Ristvedt <caleb.ristvedt@cune.org>
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;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix store database)
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#:use-module (sqlite3)
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#:use-module (guix config)
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#:use-module (guix serialization)
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#:use-module (guix store deduplication)
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#:use-module (guix base16)
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#:use-module (guix progress)
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#:use-module (guix build syscalls)
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#:use-module ((guix build utils)
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#:select (mkdir-p executable-file?))
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#:use-module (guix build store-copy)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-19)
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#:use-module (srfi srfi-26)
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#:use-module (rnrs io ports)
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#:use-module (ice-9 match)
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#:use-module (system foreign)
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#:export (sql-schema
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%default-database-file
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with-database
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path-id
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sqlite-register
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register-path
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register-items
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%epoch
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reset-timestamps))
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;;; Code for working with the store database directly.
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(define sql-schema
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;; Name of the file containing the SQL scheme or #f.
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(make-parameter #f))
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(define sqlite-exec
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;; XXX: This is was missing from guile-sqlite3 until
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;; <https://notabug.org/guile-sqlite3/guile-sqlite3/commit/b87302f9bcd18a286fed57b2ea521845eb1131d7>.
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(let ((exec (pointer->procedure
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int
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(dynamic-func "sqlite3_exec" (@@ (sqlite3) libsqlite3))
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'(* * * * *))))
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(lambda (db text)
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(let ((ret (exec ((@@ (sqlite3) db-pointer) db)
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(string->pointer text)
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%null-pointer %null-pointer %null-pointer)))
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(unless (zero? ret)
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((@@ (sqlite3) sqlite-error) db "sqlite-exec" ret))))))
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(define (initialize-database db)
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"Initializing DB, an empty database, by creating all the tables and indexes
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as specified by SQL-SCHEMA."
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(define schema
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(or (sql-schema)
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(search-path %load-path "guix/store/schema.sql")))
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(sqlite-exec db (call-with-input-file schema get-string-all)))
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(define (call-with-database file proc)
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"Pass PROC a database record corresponding to FILE. If FILE doesn't exist,
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create it and initialize it as a new database."
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(let ((new? (not (file-exists? file)))
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(db (sqlite-open file)))
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;; Turn DB in "write-ahead log" mode, which should avoid SQLITE_LOCKED
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;; errors when we have several readers: <https://www.sqlite.org/wal.html>.
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(sqlite-exec db "PRAGMA journal_mode=WAL;")
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;; Install a busy handler such that, when the database is locked, sqlite
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;; retries until 30 seconds have passed, at which point it gives up and
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;; throws SQLITE_BUSY.
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(sqlite-exec db "PRAGMA busy_timeout = 30000;")
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(dynamic-wind noop
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(lambda ()
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(when new?
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(initialize-database db))
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(proc db))
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(lambda ()
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(sqlite-close db)))))
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;; XXX: missing in guile-sqlite3@0.1.0
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(define SQLITE_BUSY 5)
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(define (call-with-transaction db proc)
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"Start a transaction with DB (make as many attempts as necessary) and run
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PROC. If PROC exits abnormally, abort the transaction, otherwise commit the
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transaction after it finishes."
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(catch 'sqlite-error
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(lambda ()
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;; We use begin immediate here so that if we need to retry, we
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;; figure that out immediately rather than because some SQLITE_BUSY
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;; exception gets thrown partway through PROC - in which case the
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;; part already executed (which may contain side-effects!) would be
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;; executed again for every retry.
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(sqlite-exec db "begin immediate;")
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(let ((result (proc)))
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(sqlite-exec db "commit;")
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result))
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(lambda (key who error description)
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(if (= error SQLITE_BUSY)
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(call-with-transaction db proc)
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(begin
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(sqlite-exec db "rollback;")
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(throw 'sqlite-error who error description))))))
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(define %default-database-file
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;; Default location of the store database.
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(string-append %store-database-directory "/db.sqlite"))
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(define-syntax-rule (with-database file db exp ...)
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"Open DB from FILE and close it when the dynamic extent of EXP... is left.
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If FILE doesn't exist, create it and initialize it as a new database."
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(call-with-database file (lambda (db) exp ...)))
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(define (last-insert-row-id db)
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;; XXX: (sqlite3) currently lacks bindings for 'sqlite3_last_insert_rowid'.
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;; Work around that.
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(let* ((stmt (sqlite-prepare db "SELECT last_insert_rowid();"
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#:cache? #t))
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(result (sqlite-fold cons '() stmt)))
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(sqlite-finalize stmt)
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(match result
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((#(id)) id)
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(_ #f))))
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(define path-id-sql
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"SELECT id FROM ValidPaths WHERE path = :path")
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(define* (path-id db path)
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"If PATH exists in the 'ValidPaths' table, return its numerical
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identifier. Otherwise, return #f."
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(let ((stmt (sqlite-prepare db path-id-sql #:cache? #t)))
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(sqlite-bind-arguments stmt #:path path)
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(let ((result (sqlite-fold cons '() stmt)))
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(sqlite-finalize stmt)
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(match result
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((#(id) . _) id)
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(_ #f)))))
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(define update-sql
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"UPDATE ValidPaths SET hash = :hash, registrationTime = :time, deriver =
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:deriver, narSize = :size WHERE id = :id")
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(define insert-sql
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"INSERT INTO ValidPaths (path, hash, registrationTime, deriver, narSize)
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VALUES (:path, :hash, :time, :deriver, :size)")
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(define* (update-or-insert db #:key path deriver hash nar-size time)
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"The classic update-if-exists and insert-if-doesn't feature that sqlite
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doesn't exactly have... they've got something close, but it involves deleting
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and re-inserting instead of updating, which causes problems with foreign keys,
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of course. Returns the row id of the row that was modified or inserted."
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(let ((id (path-id db path)))
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(if id
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(let ((stmt (sqlite-prepare db update-sql #:cache? #t)))
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(sqlite-bind-arguments stmt #:id id
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#:deriver deriver
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#:hash hash #:size nar-size #:time time)
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(sqlite-fold cons '() stmt)
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(sqlite-finalize stmt)
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(last-insert-row-id db))
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(let ((stmt (sqlite-prepare db insert-sql #:cache? #t)))
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(sqlite-bind-arguments stmt
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#:path path #:deriver deriver
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#:hash hash #:size nar-size #:time time)
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(sqlite-fold cons '() stmt) ;execute it
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(sqlite-finalize stmt)
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(last-insert-row-id db)))))
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(define add-reference-sql
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"INSERT OR REPLACE INTO Refs (referrer, reference) VALUES (:referrer, :reference);")
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(define (add-references db referrer references)
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"REFERRER is the id of the referring store item, REFERENCES is a list
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ids of items referred to."
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(let ((stmt (sqlite-prepare db add-reference-sql #:cache? #t)))
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(for-each (lambda (reference)
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(sqlite-reset stmt)
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(sqlite-bind-arguments stmt #:referrer referrer
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#:reference reference)
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(sqlite-fold cons '() stmt) ;execute it
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(last-insert-row-id db))
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references)
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(sqlite-finalize stmt)))
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(define* (sqlite-register db #:key path (references '())
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deriver hash nar-size time)
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"Registers this stuff in DB. PATH is the store item to register and
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REFERENCES is the list of store items PATH refers to; DERIVER is the '.drv'
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that produced PATH, HASH is the base16-encoded Nix sha256 hash of
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PATH (prefixed with \"sha256:\"), and NAR-SIZE is the size in bytes PATH after
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being converted to nar form. TIME is the registration time to be recorded in
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the database or #f, meaning \"right now\".
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Every store item in REFERENCES must already be registered."
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(let ((id (update-or-insert db #:path path
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#:deriver deriver
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#:hash hash
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#:nar-size nar-size
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#:time (time-second
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(or time
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(current-time time-utc))))))
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;; Call 'path-id' on each of REFERENCES. This ensures we get a
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;; "non-NULL constraint" failure if one of REFERENCES is unregistered.
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(add-references db id
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(map (cut path-id db <>) references))))
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;;;
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;;; High-level interface.
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;;;
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(define (reset-timestamps file)
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"Reset the modification time on FILE and on all the files it contains, if
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it's a directory. While at it, canonicalize file permissions."
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;; Note: We're resetting to one second after the Epoch like 'guix-daemon'
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;; has always done.
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(let loop ((file file)
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(type (stat:type (lstat file))))
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(case type
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((directory)
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(chmod file #o555)
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(utime file 1 1 0 0)
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(let ((parent file))
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(for-each (match-lambda
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(("." . _) #f)
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((".." . _) #f)
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((file . properties)
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(let ((file (string-append parent "/" file)))
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(loop file
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(match (assoc-ref properties 'type)
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((or 'unknown #f)
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(stat:type (lstat file)))
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(type type))))))
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(scandir* parent))))
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((symlink)
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(utime file 1 1 0 0 AT_SYMLINK_NOFOLLOW))
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(else
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(chmod file (if (executable-file? file) #o555 #o444))
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(utime file 1 1 0 0)))))
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(define* (register-path path
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#:key (references '()) deriver prefix
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state-directory (deduplicate? #t)
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(reset-timestamps? #t)
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(schema (sql-schema)))
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"Register PATH as a valid store file, with REFERENCES as its list of
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references, and DERIVER as its deriver (.drv that led to it.) If PREFIX is
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given, it must be the name of the directory containing the new store to
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initialize; if STATE-DIRECTORY is given, it must be a string containing the
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absolute file name to the state directory of the store being initialized.
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Return #t on success.
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Use with care as it directly modifies the store! This is primarily meant to
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be used internally by the daemon's build hook."
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(register-items (list (store-info path deriver references))
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#:prefix prefix #:state-directory state-directory
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#:deduplicate? deduplicate?
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#:reset-timestamps? reset-timestamps?
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#:schema schema
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#:log-port (%make-void-port "w")))
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(define %epoch
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;; When it all began.
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(make-time time-utc 0 1))
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(define* (register-items items
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#:key prefix state-directory
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(deduplicate? #t)
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(reset-timestamps? #t)
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registration-time
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(schema (sql-schema))
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(log-port (current-error-port)))
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"Register all of ITEMS, a list of <store-info> records as returned by
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'read-reference-graph', in the database under PREFIX/STATE-DIRECTORY. ITEMS
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must be in topological order (with leaves first.) If the database is
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initially empty, apply SCHEMA to initialize it. REGISTRATION-TIME must be the
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registration time to be recorded in the database; #f means \"now\".
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Write a progress report to LOG-PORT."
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;; Priority for options: first what is given, then environment variables,
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;; then defaults. %state-directory, %store-directory, and
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;; %store-database-directory already handle the "environment variables /
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;; defaults" question, so we only need to choose between what is given and
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;; those.
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(define db-dir
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(cond (state-directory
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(string-append state-directory "/db"))
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(prefix
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(string-append prefix %localstatedir "/guix/db"))
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(else
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%store-database-directory)))
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(define store-dir
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(if prefix
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(string-append prefix %storedir)
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%store-directory))
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(define (register db item)
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(define to-register
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(if prefix
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(string-append %storedir "/" (basename (store-info-item item)))
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;; note: we assume here that if path is, for example,
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;; /foo/bar/gnu/store/thing.txt and prefix isn't given, then an
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;; environment variable has been used to change the store directory
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;; to /foo/bar/gnu/store, since otherwise real-path would end up
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;; being /gnu/store/thing.txt, which is probably not the right file
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;; in this case.
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(store-info-item item)))
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(define real-file-name
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(string-append store-dir "/" (basename (store-info-item item))))
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;; When TO-REGISTER is already registered, skip it. This makes a
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;; significant differences when 'register-closures' is called
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;; consecutively for overlapping closures such as 'system' and 'bootcfg'.
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(unless (path-id db to-register)
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(when reset-timestamps?
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(reset-timestamps real-file-name))
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(let-values (((hash nar-size) (nar-sha256 real-file-name)))
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(sqlite-register db #:path to-register
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#:references (store-info-references item)
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#:deriver (store-info-deriver item)
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#:hash (string-append "sha256:"
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(bytevector->base16-string hash))
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#:nar-size nar-size
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#:time registration-time)
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(when deduplicate?
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(deduplicate real-file-name hash #:store store-dir)))))
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(mkdir-p db-dir)
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(parameterize ((sql-schema schema))
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(with-database (string-append db-dir "/db.sqlite") db
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(call-with-transaction db
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(lambda ()
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(let* ((prefix (format #f "registering ~a items" (length items)))
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(progress (progress-reporter/bar (length items)
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prefix log-port)))
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(call-with-progress-reporter progress
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(lambda (report)
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(for-each (lambda (item)
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(register db item)
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(report))
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items)))))))))
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