;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org> ;;; ;;; This file is part of GNU Guix. ;;; ;;; GNU Guix is free software; you can redistribute it and/or modify it ;;; under the terms of the GNU General Public License as published by ;;; the Free Software Foundation; either version 3 of the License, or (at ;;; your option) any later version. ;;; ;;; GNU Guix is distributed in the hope that it will be useful, but ;;; WITHOUT ANY WARRANTY; without even the implied warranty of ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;;; GNU General Public License for more details. ;;; ;;; You should have received a copy of the GNU General Public License ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. (define-module (guix store) #:use-module (guix utils) #:use-module (guix config) #:use-module (guix memoization) #:use-module (guix serialization) #:use-module (guix monads) #:use-module (guix base16) #:autoload (guix base32) (bytevector->base32-string) #:autoload (guix build syscalls) (terminal-columns) #:use-module (rnrs bytevectors) #:use-module (ice-9 binary-ports) #:use-module (srfi srfi-1) #:use-module (srfi srfi-9) #:use-module (srfi srfi-9 gnu) #:use-module (srfi srfi-11) #:use-module (srfi srfi-26) #:use-module (srfi srfi-34) #:use-module (srfi srfi-35) #:use-module (srfi srfi-39) #:use-module (ice-9 match) #:use-module (ice-9 regex) #:use-module (ice-9 vlist) #:use-module (ice-9 popen) #:export (%daemon-socket-file %gc-roots-directory %default-substitute-urls nix-server? nix-server-major-version nix-server-minor-version nix-server-socket &nix-error nix-error? &nix-connection-error nix-connection-error? nix-connection-error-file nix-connection-error-code &nix-protocol-error nix-protocol-error? nix-protocol-error-message nix-protocol-error-status hash-algo build-mode open-connection close-connection with-store set-build-options set-build-options* valid-path? query-path-hash hash-part->path query-path-info add-data-to-store add-text-to-store add-to-store build-things build query-failed-paths clear-failed-paths add-temp-root add-indirect-root add-permanent-root remove-permanent-root substitutable? substitutable-path substitutable-deriver substitutable-references substitutable-download-size substitutable-nar-size has-substitutes? substitutable-paths substitutable-path-info path-info? path-info-deriver path-info-hash path-info-references path-info-registration-time path-info-nar-size built-in-builders references references/substitutes references* requisites referrers optimize-store verify-store topologically-sorted valid-derivers query-derivation-outputs live-paths dead-paths collect-garbage delete-paths import-paths export-paths current-build-output-port register-path %store-monad store-bind store-return store-lift store-lower run-with-store %guile-for-build current-system set-current-system text-file interned-file %store-prefix store-path? direct-store-path? derivation-path? store-path-package-name store-path-hash-part direct-store-path log-file)) (define %protocol-version #x161) (define %worker-magic-1 #x6e697863) ; "nixc" (define %worker-magic-2 #x6478696f) ; "dxio" (define (protocol-major magic) (logand magic #xff00)) (define (protocol-minor magic) (logand magic #x00ff)) (define-syntax define-enumerate-type (syntax-rules () ((_ name->int (name id) ...) (define-syntax name->int (syntax-rules (name ...) ((_ name) id) ...))))) (define-enumerate-type operation-id ;; operation numbers from worker-protocol.hh (quit 0) (valid-path? 1) (has-substitutes? 3) (query-path-hash 4) (query-references 5) (query-referrers 6) (add-to-store 7) (add-text-to-store 8) (build-things 9) (ensure-path 10) (add-temp-root 11) (add-indirect-root 12) (sync-with-gc 13) (find-roots 14) (export-path 16) (query-deriver 18) (set-options 19) (collect-garbage 20) ;;(query-substitutable-path-info 21) ; obsolete as of #x10c (query-derivation-outputs 22) (query-all-valid-paths 23) (query-failed-paths 24) (clear-failed-paths 25) (query-path-info 26) (import-paths 27) (query-derivation-output-names 28) (query-path-from-hash-part 29) (query-substitutable-path-infos 30) (query-valid-paths 31) (query-substitutable-paths 32) (query-valid-derivers 33) (optimize-store 34) (verify-store 35) (built-in-builders 80)) (define-enumerate-type hash-algo ;; hash.hh (md5 1) (sha1 2) (sha256 3)) (define-enumerate-type build-mode ;; store-api.hh (normal 0) (repair 1) (check 2)) (define-enumerate-type gc-action ;; store-api.hh (return-live 0) (return-dead 1) (delete-dead 2) (delete-specific 3)) (define %default-socket-path (string-append %state-directory "/daemon-socket/socket")) (define %daemon-socket-file ;; File name of the socket the daemon listens too. (make-parameter (or (getenv "GUIX_DAEMON_SOCKET") %default-socket-path))) ;; Information about a substitutable store path. (define-record-type <substitutable> (substitutable path deriver refs dl-size nar-size) substitutable? (path substitutable-path) (deriver substitutable-deriver) (refs substitutable-references) (dl-size substitutable-download-size) (nar-size substitutable-nar-size)) (define (read-substitutable-path-list p) (let loop ((len (read-int p)) (result '())) (if (zero? len) (reverse result) (let ((path (read-store-path p)) (deriver (read-store-path p)) (refs (read-store-path-list p)) (dl-size (read-long-long p)) (nar-size (read-long-long p))) (loop (- len 1) (cons (substitutable path deriver refs dl-size nar-size) result)))))) ;; Information about a store path. (define-record-type <path-info> (path-info deriver hash references registration-time nar-size) path-info? (deriver path-info-deriver) ;string | #f (hash path-info-hash) (references path-info-references) (registration-time path-info-registration-time) (nar-size path-info-nar-size)) (define (read-path-info p) (let ((deriver (match (read-store-path p) ("" #f) (x x))) (hash (base16-string->bytevector (read-string p))) (refs (read-store-path-list p)) (registration-time (read-int p)) (nar-size (read-long-long p))) (path-info deriver hash refs registration-time nar-size))) (define-syntax write-arg (syntax-rules (integer boolean bytevector string string-list string-pairs store-path store-path-list base16) ((_ integer arg p) (write-int arg p)) ((_ boolean arg p) (write-int (if arg 1 0) p)) ((_ bytevector arg p) (write-bytevector arg p)) ((_ string arg p) (write-string arg p)) ((_ string-list arg p) (write-string-list arg p)) ((_ string-pairs arg p) (write-string-pairs arg p)) ((_ store-path arg p) (write-store-path arg p)) ((_ store-path-list arg p) (write-store-path-list arg p)) ((_ base16 arg p) (write-string (bytevector->base16-string arg) p)))) (define-syntax read-arg (syntax-rules (integer boolean string store-path store-path-list string-list substitutable-path-list path-info base16) ((_ integer p) (read-int p)) ((_ boolean p) (not (zero? (read-int p)))) ((_ string p) (read-string p)) ((_ store-path p) (read-store-path p)) ((_ store-path-list p) (read-store-path-list p)) ((_ string-list p) (read-string-list p)) ((_ substitutable-path-list p) (read-substitutable-path-list p)) ((_ path-info p) (read-path-info p)) ((_ base16 p) (base16-string->bytevector (read-string p))))) ;; remote-store.cc (define-record-type <nix-server> (%make-nix-server socket major minor ats-cache atts-cache) nix-server? (socket nix-server-socket) (major nix-server-major-version) (minor nix-server-minor-version) ;; Caches. We keep them per-connection, because store paths build ;; during the session are temporary GC roots kept for the duration of ;; the session. (ats-cache nix-server-add-to-store-cache) (atts-cache nix-server-add-text-to-store-cache)) (set-record-type-printer! <nix-server> (lambda (obj port) (format port "#<build-daemon ~a.~a ~a>" (nix-server-major-version obj) (nix-server-minor-version obj) (number->string (object-address obj) 16)))) (define-condition-type &nix-error &error nix-error?) (define-condition-type &nix-connection-error &nix-error nix-connection-error? (file nix-connection-error-file) (errno nix-connection-error-code)) (define-condition-type &nix-protocol-error &nix-error nix-protocol-error? (message nix-protocol-error-message) (status nix-protocol-error-status)) (define (open-unix-domain-socket file) "Connect to the Unix-domain socket at FILE and return it. Raise a '&nix-connection-error' upon error." (let ((s (with-fluids ((%default-port-encoding #f)) ;; This trick allows use of the `scm_c_read' optimization. (socket PF_UNIX SOCK_STREAM 0))) (a (make-socket-address PF_UNIX file))) (catch 'system-error (lambda () (connect s a) s) (lambda args ;; Translate the error to something user-friendly. (let ((errno (system-error-errno args))) (raise (condition (&nix-connection-error (file file) (errno errno))))))))) (define* (open-connection #:optional (file (%daemon-socket-file)) #:key port (reserve-space? #t) cpu-affinity) "Connect to the daemon over the Unix-domain socket at FILE, or, if PORT is not #f, use it as the I/O port over which to communicate to a build daemon. When RESERVE-SPACE? is true, instruct it to reserve a little bit of extra space on the file system so that the garbage collector can still operate, should the disk become full. When CPU-AFFINITY is true, it must be an integer corresponding to an OS-level CPU number to which the daemon's worker process for this connection will be pinned. Return a server object." (guard (c ((nar-error? c) ;; One of the 'write-' or 'read-' calls below failed, but this is ;; really a connection error. (raise (condition (&nix-connection-error (file (or port file)) (errno EPROTO)) (&message (message "build daemon handshake failed")))))) (let ((port (or port (open-unix-domain-socket file)))) (write-int %worker-magic-1 port) (let ((r (read-int port))) (and (eqv? r %worker-magic-2) (let ((v (read-int port))) (and (eqv? (protocol-major %protocol-version) (protocol-major v)) (begin (write-int %protocol-version port) (when (>= (protocol-minor v) 14) (write-int (if cpu-affinity 1 0) port) (when cpu-affinity (write-int cpu-affinity port))) (when (>= (protocol-minor v) 11) (write-int (if reserve-space? 1 0) port)) (let ((conn (%make-nix-server port (protocol-major v) (protocol-minor v) (make-hash-table 100) (make-hash-table 100)))) (let loop ((done? (process-stderr conn))) (or done? (process-stderr conn))) conn))))))))) (define (close-connection server) "Close the connection to SERVER." (close (nix-server-socket server))) (define-syntax-rule (with-store store exp ...) "Bind STORE to an open connection to the store and evaluate EXPs; automatically close the store when the dynamic extent of EXP is left." (let ((store (open-connection))) (dynamic-wind (const #f) (lambda () exp ...) (lambda () (false-if-exception (close-connection store)))))) (define current-build-output-port ;; The port where build output is sent. (make-parameter (current-error-port))) (define* (dump-port in out #:optional len #:key (buffer-size 16384)) "Read LEN bytes from IN (or as much as possible if LEN is #f) and write it to OUT, using chunks of BUFFER-SIZE bytes." (define buffer (make-bytevector buffer-size)) (let loop ((total 0) (bytes (get-bytevector-n! in buffer 0 (if len (min len buffer-size) buffer-size)))) (or (eof-object? bytes) (and len (= total len)) (let ((total (+ total bytes))) (put-bytevector out buffer 0 bytes) (loop total (get-bytevector-n! in buffer 0 (if len (min (- len total) buffer-size) buffer-size))))))) (define %newlines ;; Newline characters triggering a flush of 'current-build-output-port'. ;; Unlike Guile's _IOLBF, we flush upon #\return so that progress reports ;; that use that trick are correctly displayed. (char-set #\newline #\return)) (define* (process-stderr server #:optional user-port) "Read standard output and standard error from SERVER, writing it to CURRENT-BUILD-OUTPUT-PORT. Return #t when SERVER is done sending data, and #f otherwise; in the latter case, the caller should call `process-stderr' again until #t is returned or an error is raised. Since the build process's output cannot be assumed to be UTF-8, we conservatively consider it to be Latin-1, thereby avoiding possible encoding conversion errors." (define p (nix-server-socket server)) ;; magic cookies from worker-protocol.hh (define %stderr-next #x6f6c6d67) ; "olmg", build log (define %stderr-read #x64617461) ; "data", data needed from source (define %stderr-write #x64617416) ; "dat\x16", data for sink (define %stderr-last #x616c7473) ; "alts", we're done (define %stderr-error #x63787470) ; "cxtp", error reporting (let ((k (read-int p))) (cond ((= k %stderr-write) ;; Write a byte stream to USER-PORT. (let* ((len (read-int p)) (m (modulo len 8))) (dump-port p user-port len #:buffer-size (if (<= len 16384) 16384 65536)) (unless (zero? m) ;; Consume padding, as for strings. (get-bytevector-n p (- 8 m)))) #f) ((= k %stderr-read) ;; Read a byte stream from USER-PORT. ;; Note: Avoid 'get-bytevector-n' to work around ;; <http://bugs.gnu.org/17591> in Guile up to 2.0.11. (let* ((max-len (read-int p)) (data (make-bytevector max-len)) (len (get-bytevector-n! user-port data 0 max-len))) (write-int len p) (put-bytevector p data 0 len) (write-padding len p) #f)) ((= k %stderr-next) ;; Log a string. Build logs are usually UTF-8-encoded, but they ;; may also contain arbitrary byte sequences that should not cause ;; this to fail. Thus, use the permissive ;; 'read-maybe-utf8-string'. (let ((s (read-maybe-utf8-string p))) (display s (current-build-output-port)) (when (string-any %newlines s) (force-output (current-build-output-port))) #f)) ((= k %stderr-error) ;; Report an error. (let ((error (read-maybe-utf8-string p)) ;; Currently the daemon fails to send a status code for early ;; errors like DB schema version mismatches, so check for EOF. (status (if (and (>= (nix-server-minor-version server) 8) (not (eof-object? (lookahead-u8 p)))) (read-int p) 1))) (raise (condition (&nix-protocol-error (message error) (status status)))))) ((= k %stderr-last) ;; The daemon is done (see `stopWork' in `nix-worker.cc'.) #t) (else (raise (condition (&nix-protocol-error (message "invalid error code") (status k)))))))) (define %default-substitute-urls ;; Default list of substituters. This is *not* the list baked in ;; 'guix-daemon', but it is used by 'guix-service-type' and and a couple of ;; clients ('guix build --log-file' uses it.) (map (if (false-if-exception (resolve-interface '(gnutls))) (cut string-append "https://" <>) (cut string-append "http://" <>)) '("mirror.hydra.gnu.org"))) (define* (set-build-options server #:key keep-failed? keep-going? fallback? (verbosity 0) rounds ;number of build rounds max-build-jobs timeout max-silent-time (use-build-hook? #t) (build-verbosity 0) (log-type 0) (print-build-trace #t) build-cores (use-substitutes? #t) ;; Client-provided substitute URLs. If it is #f, ;; the daemon's settings are used. Otherwise, it ;; overrides the daemons settings; see 'guix ;; substitute'. (substitute-urls #f) ;; Number of columns in the client's terminal. (terminal-columns (terminal-columns)) ;; Locale of the client. (locale (false-if-exception (setlocale LC_ALL)))) ;; Must be called after `open-connection'. (define socket (nix-server-socket server)) (let-syntax ((send (syntax-rules () ((_ (type option) ...) (begin (write-arg type option socket) ...))))) (write-int (operation-id set-options) socket) (send (boolean keep-failed?) (boolean keep-going?) (boolean fallback?) (integer verbosity)) (when (< (nix-server-minor-version server) #x61) (let ((max-build-jobs (or max-build-jobs 1)) (max-silent-time (or max-silent-time 3600))) (send (integer max-build-jobs) (integer max-silent-time)))) (when (>= (nix-server-minor-version server) 2) (send (boolean use-build-hook?))) (when (>= (nix-server-minor-version server) 4) (send (integer build-verbosity) (integer log-type) (boolean print-build-trace))) (when (and (>= (nix-server-minor-version server) 6) (< (nix-server-minor-version server) #x61)) (let ((build-cores (or build-cores (current-processor-count)))) (send (integer build-cores)))) (when (>= (nix-server-minor-version server) 10) (send (boolean use-substitutes?))) (when (>= (nix-server-minor-version server) 12) (let ((pairs `(,@(if timeout `(("build-timeout" . ,(number->string timeout))) '()) ,@(if max-silent-time `(("build-max-silent-time" . ,(number->string max-silent-time))) '()) ,@(if max-build-jobs `(("build-max-jobs" . ,(number->string max-build-jobs))) '()) ,@(if build-cores `(("build-cores" . ,(number->string build-cores))) '()) ,@(if substitute-urls `(("substitute-urls" . ,(string-join substitute-urls))) '()) ,@(if rounds `(("build-repeat" . ,(number->string (max 0 (1- rounds))))) '()) ,@(if terminal-columns `(("terminal-columns" . ,(number->string terminal-columns))) '()) ,@(if locale `(("locale" . ,locale)) '())))) (send (string-pairs pairs)))) (let loop ((done? (process-stderr server))) (or done? (process-stderr server))))) (define-syntax operation (syntax-rules () "Define a client-side RPC stub for the given operation." ((_ (name (type arg) ...) docstring return ...) (lambda (server arg ...) docstring (let ((s (nix-server-socket server))) (write-int (operation-id name) s) (write-arg type arg s) ... ;; Loop until the server is done sending error output. (let loop ((done? (process-stderr server))) (or done? (loop (process-stderr server)))) (values (read-arg return s) ...)))))) (define-syntax-rule (define-operation (name args ...) docstring return ...) (define name (operation (name args ...) docstring return ...))) (define-operation (valid-path? (string path)) "Return #t when PATH designates a valid store item and #f otherwise (an invalid item may exist on disk but still be invalid, for instance because it is the result of an aborted or failed build.) A '&nix-protocol-error' condition is raised if PATH is not prefixed by the store directory (/gnu/store)." boolean) (define-operation (query-path-hash (store-path path)) "Return the SHA256 hash of the nar serialization of PATH as a bytevector." base16) (define hash-part->path (let ((query-path-from-hash-part (operation (query-path-from-hash-part (string hash)) #f store-path))) (lambda (server hash-part) "Return the store path whose hash part is HASH-PART (a nix-base32 string). Raise an error if no such path exists." ;; This RPC is primarily used by Hydra to reply to HTTP GETs of ;; /HASH.narinfo. (query-path-from-hash-part server hash-part)))) (define-operation (query-path-info (store-path path)) "Return the info (hash, references, etc.) for PATH." path-info) (define add-data-to-store ;; A memoizing version of `add-to-store', to avoid repeated RPCs with ;; the very same arguments during a given session. (let ((add-text-to-store (operation (add-text-to-store (string name) (bytevector text) (string-list references)) #f store-path))) (lambda* (server name bytes #:optional (references '())) "Add BYTES under file NAME in the store, and return its store path. REFERENCES is the list of store paths referred to by the resulting store path." (let* ((args `(,bytes ,name ,references)) (cache (nix-server-add-text-to-store-cache server))) (or (hash-ref cache args) (let ((path (add-text-to-store server name bytes references))) (hash-set! cache args path) path)))))) (define* (add-text-to-store store name text #:optional (references '())) "Add TEXT under file NAME in the store, and return its store path. REFERENCES is the list of store paths referred to by the resulting store path." (add-data-to-store store name (string->utf8 text) references)) (define true ;; Define it once and for all since we use it as a default value for ;; 'add-to-store' and want to make sure two default values are 'eq?' for the ;; purposes or memoization. (lambda (file stat) #t)) (define add-to-store ;; A memoizing version of `add-to-store'. This is important because ;; `add-to-store' leads to huge data transfers to the server, and ;; because it's often called many times with the very same argument. (let ((add-to-store (lambda* (server basename recursive? hash-algo file-name #:key (select? true)) ;; We don't use the 'operation' macro so we can pass SELECT? to ;; 'write-file'. (let ((port (nix-server-socket server))) (write-int (operation-id add-to-store) port) (write-string basename port) (write-int 1 port) ;obsolete, must be #t (write-int (if recursive? 1 0) port) (write-string hash-algo port) (write-file file-name port #:select? select?) (let loop ((done? (process-stderr server))) (or done? (loop (process-stderr server)))) (read-store-path port))))) (lambda* (server basename recursive? hash-algo file-name #:key (select? true)) "Add the contents of FILE-NAME under BASENAME to the store. When RECURSIVE? is false, FILE-NAME must designate a regular file--not a directory nor a symlink. When RECURSIVE? is true and FILE-NAME designates a directory, the contents of FILE-NAME are added recursively; if FILE-NAME designates a flat file and RECURSIVE? is true, its contents are added, and its permission bits are kept. HASH-ALGO must be a string such as \"sha256\". When RECURSIVE? is true, call (SELECT? FILE STAT) for each directory entry, where FILE is the entry's absolute file name and STAT is the result of 'lstat'; exclude entries for which SELECT? does not return true." (let* ((st (false-if-exception (lstat file-name))) (args `(,st ,basename ,recursive? ,hash-algo ,select?)) (cache (nix-server-add-to-store-cache server))) (or (and st (hash-ref cache args)) (let ((path (add-to-store server basename recursive? hash-algo file-name #:select? select?))) (hash-set! cache args path) path)))))) (define build-things (let ((build (operation (build-things (string-list things) (integer mode)) "Do it!" boolean)) (build/old (operation (build-things (string-list things)) "Do it!" boolean))) (lambda* (store things #:optional (mode (build-mode normal))) "Build THINGS, a list of store items which may be either '.drv' files or outputs, and return when the worker is done building them. Elements of THINGS that are not derivations can only be substituted and not built locally. Return #t on success." (if (>= (nix-server-minor-version store) 15) (build store things mode) (if (= mode (build-mode normal)) (build/old store things) (raise (condition (&nix-protocol-error (message "unsupported build mode") (status 1))))))))) (define-operation (add-temp-root (store-path path)) "Make PATH a temporary root for the duration of the current session. Return #t." boolean) (define-operation (add-indirect-root (string file-name)) "Make the symlink FILE-NAME an indirect root for the garbage collector: whatever store item FILE-NAME points to will not be collected. Return #t on success. FILE-NAME can be anywhere on the file system, but it must be an absolute file name--it is the caller's responsibility to ensure that it is an absolute file name." boolean) (define %gc-roots-directory ;; The place where garbage collector roots (symlinks) are kept. (string-append %state-directory "/gcroots")) (define (add-permanent-root target) "Add a garbage collector root pointing to TARGET, an element of the store, preventing TARGET from even being collected. This can also be used if TARGET does not exist yet. Raise an error if the caller does not have write access to the GC root directory." (let* ((root (string-append %gc-roots-directory "/" (basename target)))) (catch 'system-error (lambda () (symlink target root)) (lambda args ;; If ROOT already exists, this is fine; otherwise, re-throw. (unless (= EEXIST (system-error-errno args)) (apply throw args)))))) (define (remove-permanent-root target) "Remove the permanent garbage collector root pointing to TARGET. Raise an error if there is no such root." (delete-file (string-append %gc-roots-directory "/" (basename target)))) (define references (operation (query-references (store-path path)) "Return the list of references of PATH." store-path-list)) (define %reference-cache ;; Brute-force cache mapping store items to their list of references. ;; Caching matters because when building a profile in the presence of ;; grafts, we keep calling 'graft-derivation', which in turn calls ;; 'references/substitutes' many times with the same arguments. Ideally we ;; would use a cache associated with the daemon connection instead (XXX). (make-hash-table 100)) (define (references/substitutes store items) "Return the list of list of references of ITEMS; the result has the same length as ITEMS. Query substitute information for any item missing from the store at once. Raise a '&nix-protocol-error' exception if reference information for one of ITEMS is missing." (let* ((local-refs (map (lambda (item) (or (hash-ref %reference-cache item) (guard (c ((nix-protocol-error? c) #f)) (references store item)))) items)) (missing (fold-right (lambda (item local-ref result) (if local-ref result (cons item result))) '() items local-refs)) ;; Query all the substitutes at once to minimize the cost of ;; launching 'guix substitute' and making HTTP requests. (substs (substitutable-path-info store missing))) (when (< (length substs) (length missing)) (raise (condition (&nix-protocol-error (message "cannot determine \ the list of references") (status 1))))) ;; Intersperse SUBSTS and LOCAL-REFS. (let loop ((items items) (local-refs local-refs) (result '())) (match items (() (let ((result (reverse result))) (for-each (cut hash-set! %reference-cache <> <>) items result) result)) ((item items ...) (match local-refs ((#f tail ...) (loop items tail (cons (any (lambda (subst) (and (string=? (substitutable-path subst) item) (substitutable-references subst))) substs) result))) ((head tail ...) (loop items tail (cons head result))))))))) (define* (fold-path store proc seed paths #:optional (relatives (cut references store <>))) "Call PROC for each of the RELATIVES of PATHS, exactly once, and return the result formed from the successive calls to PROC, the first of which is passed SEED." (let loop ((paths paths) (result seed) (seen vlist-null)) (match paths ((path rest ...) (if (vhash-assoc path seen) (loop rest result seen) (let ((seen (vhash-cons path #t seen)) (rest (append rest (relatives path))) (result (proc path result))) (loop rest result seen)))) (() result)))) (define (requisites store paths) "Return the requisites of PATHS, including PATHS---i.e., their closures (all its references, recursively)." (fold-path store cons '() paths)) (define (topologically-sorted store paths) "Return a list containing PATHS and all their references sorted in topological order." (define (traverse) ;; Do a simple depth-first traversal of all of PATHS. (let loop ((paths paths) (visited vlist-null) (result '())) (define (visit n) (vhash-cons n #t visited)) (define (visited? n) (vhash-assoc n visited)) (match paths ((head tail ...) (if (visited? head) (loop tail visited result) (call-with-values (lambda () (loop (references store head) (visit head) result)) (lambda (visited result) (loop tail visited (cons head result)))))) (() (values visited result))))) (call-with-values traverse (lambda (_ result) (reverse result)))) (define referrers (operation (query-referrers (store-path path)) "Return the list of path that refer to PATH." store-path-list)) (define valid-derivers (operation (query-valid-derivers (store-path path)) "Return the list of valid \"derivers\" of PATH---i.e., all the .drv present in the store that have PATH among their outputs." store-path-list)) (define query-derivation-outputs ; avoid name clash with `derivation-outputs' (operation (query-derivation-outputs (store-path path)) "Return the list of outputs of PATH, a .drv file." store-path-list)) (define-operation (has-substitutes? (store-path path)) "Return #t if binary substitutes are available for PATH, and #f otherwise." boolean) (define substitutable-paths (operation (query-substitutable-paths (store-path-list paths)) "Return the subset of PATHS that is substitutable." store-path-list)) (define substitutable-path-info (operation (query-substitutable-path-infos (store-path-list paths)) "Return information about the subset of PATHS that is substitutable. For each substitutable path, a `substitutable?' object is returned; thus, the resulting list can be shorter than PATHS. Furthermore, that there is no guarantee that the order of the resulting list matches the order of PATHS." substitutable-path-list)) (define built-in-builders (let ((builders (operation (built-in-builders) "Return the built-in builders." string-list))) (lambda (store) "Return the names of the supported built-in derivation builders supported by STORE." ;; Check whether STORE's version supports this RPC and built-in ;; derivation builders in general, which appeared in Guix > 0.11.0. ;; Return the empty list if it doesn't. Note that this RPC does not ;; exist in 'nix-daemon'. (if (or (> (nix-server-major-version store) #x100) (and (= (nix-server-major-version store) #x100) (>= (nix-server-minor-version store) #x60))) (builders store) '())))) (define-operation (optimize-store) "Optimize the store by hard-linking identical files (\"deduplication\".) Return #t on success." ;; Note: the daemon in Guix <= 0.8.2 does not implement this RPC. boolean) (define verify-store (let ((verify (operation (verify-store (boolean check-contents?) (boolean repair?)) "Verify the store." boolean))) (lambda* (store #:key check-contents? repair?) "Verify the integrity of the store and return false if errors remain, and true otherwise. When REPAIR? is true, repair any missing or altered store items by substituting them (this typically requires root privileges because it is not an atomic operation.) When CHECK-CONTENTS? is true, check the contents of store items; this can take a lot of time." (not (verify store check-contents? repair?))))) (define (run-gc server action to-delete min-freed) "Perform the garbage-collector operation ACTION, one of the `gc-action' values. When ACTION is `delete-specific', the TO-DELETE is the list of store paths to delete. IGNORE-LIVENESS? should always be #f. MIN-FREED is the minimum amount of disk space to be freed, in bytes, before the GC can stop. Return the list of store paths delete, and the number of bytes freed." (let ((s (nix-server-socket server))) (write-int (operation-id collect-garbage) s) (write-int action s) (write-store-path-list to-delete s) (write-arg boolean #f s) ; ignore-liveness? (write-long-long min-freed s) (write-int 0 s) ; obsolete (when (>= (nix-server-minor-version server) 5) ;; Obsolete `use-atime' and `max-atime' parameters. (write-int 0 s) (write-int 0 s)) ;; Loop until the server is done sending error output. (let loop ((done? (process-stderr server))) (or done? (loop (process-stderr server)))) (let ((paths (read-store-path-list s)) (freed (read-long-long s)) (obsolete (read-long-long s))) (unless (null? paths) ;; To be on the safe side, completely invalidate both caches. ;; Otherwise we could end up returning store paths that are no longer ;; valid. (hash-clear! (nix-server-add-to-store-cache server)) (hash-clear! (nix-server-add-text-to-store-cache server))) (values paths freed)))) (define-syntax-rule (%long-long-max) ;; Maximum unsigned 64-bit integer. (- (expt 2 64) 1)) (define (live-paths server) "Return the list of live store paths---i.e., store paths still referenced, and thus not subject to being garbage-collected." (run-gc server (gc-action return-live) '() (%long-long-max))) (define (dead-paths server) "Return the list of dead store paths---i.e., store paths no longer referenced, and thus subject to being garbage-collected." (run-gc server (gc-action return-dead) '() (%long-long-max))) (define* (collect-garbage server #:optional (min-freed (%long-long-max))) "Collect garbage from the store at SERVER. If MIN-FREED is non-zero, then collect at least MIN-FREED bytes. Return the paths that were collected, and the number of bytes freed." (run-gc server (gc-action delete-dead) '() min-freed)) (define* (delete-paths server paths #:optional (min-freed (%long-long-max))) "Delete PATHS from the store at SERVER, if they are no longer referenced. If MIN-FREED is non-zero, then stop after at least MIN-FREED bytes have been collected. Return the paths that were collected, and the number of bytes freed." (run-gc server (gc-action delete-specific) paths min-freed)) (define (import-paths server port) "Import the set of store paths read from PORT into SERVER's store. An error is raised if the set of paths read from PORT is not signed (as per 'export-path #:sign? #t'.) Return the list of store paths imported." (let ((s (nix-server-socket server))) (write-int (operation-id import-paths) s) (let loop ((done? (process-stderr server port))) (or done? (loop (process-stderr server port)))) (read-store-path-list s))) (define* (export-path server path port #:key (sign? #t)) "Export PATH to PORT. When SIGN? is true, sign it." (let ((s (nix-server-socket server))) (write-int (operation-id export-path) s) (write-store-path path s) (write-arg boolean sign? s) (let loop ((done? (process-stderr server port))) (or done? (loop (process-stderr server port)))) (= 1 (read-int s)))) (define* (export-paths server paths port #:key (sign? #t) recursive?) "Export the store paths listed in PATHS to PORT, in topological order, signing them if SIGN? is true. When RECURSIVE? is true, export the closure of PATHS---i.e., PATHS and all their dependencies." (define ordered (let ((sorted (topologically-sorted server paths))) ;; When RECURSIVE? is #f, filter out the references of PATHS. (if recursive? sorted (filter (cut member <> paths) sorted)))) (let loop ((paths ordered)) (match paths (() (write-int 0 port)) ((head tail ...) (write-int 1 port) (and (export-path server head port #:sign? sign?) (loop tail)))))) (define-operation (query-failed-paths) "Return the list of store items for which a build failure is cached. The result is always the empty list unless the daemon was started with '--cache-failures'." store-path-list) (define-operation (clear-failed-paths (store-path-list items)) "Remove ITEMS from the list of cached build failures. This makes sense only when the daemon was started with '--cache-failures'." boolean) (define* (register-path path #:key (references '()) deriver prefix state-directory) "Register PATH as a valid store file, with REFERENCES as its list of references, and DERIVER as its deriver (.drv that led to it.) If PREFIX is not #f, it must be the name of the directory containing the new store to initialize; if STATE-DIRECTORY is not #f, it must be a string containing the absolute file name to the state directory of the store being initialized. Return #t on success. Use with care as it directly modifies the store! This is primarily meant to be used internally by the daemon's build hook." ;; Currently this is implemented by calling out to the fine C++ blob. (let ((pipe (apply open-pipe* OPEN_WRITE %guix-register-program `(,@(if prefix `("--prefix" ,prefix) '()) ,@(if state-directory `("--state-directory" ,state-directory) '()))))) (and pipe (begin (format pipe "~a~%~a~%~a~%" path (or deriver "") (length references)) (for-each (cut format pipe "~a~%" <>) references) (zero? (close-pipe pipe)))))) ;;; ;;; Store monad. ;;; (define-syntax-rule (define-alias new old) (define-syntax new (identifier-syntax old))) ;; The store monad allows us to (1) build sequences of operations in the ;; store, and (2) make the store an implicit part of the execution context, ;; rather than a parameter of every single function. (define-alias %store-monad %state-monad) (define-alias store-return state-return) (define-alias store-bind state-bind) (define (preserve-documentation original proc) "Return PROC with documentation taken from ORIGINAL." (set-object-property! proc 'documentation (procedure-property original 'documentation)) proc) (define (store-lift proc) "Lift PROC, a procedure whose first argument is a connection to the store, in the store monad." (preserve-documentation proc (lambda args (lambda (store) (values (apply proc store args) store))))) (define (store-lower proc) "Lower PROC, a monadic procedure in %STORE-MONAD, to a \"normal\" procedure taking the store as its first argument." (preserve-documentation proc (lambda (store . args) (run-with-store store (apply proc args))))) ;; ;; Store monad operators. ;; (define* (text-file name text #:optional (references '())) "Return as a monadic value the absolute file name in the store of the file containing TEXT, a string. REFERENCES is a list of store items that the resulting text file refers to; it defaults to the empty list." (lambda (store) (values (add-text-to-store store name text references) store))) (define* (interned-file file #:optional name #:key (recursive? #t) (select? true)) "Return the name of FILE once interned in the store. Use NAME as its store name, or the basename of FILE if NAME is omitted. When RECURSIVE? is true, the contents of FILE are added recursively; if FILE designates a flat file and RECURSIVE? is true, its contents are added, and its permission bits are kept. When RECURSIVE? is true, call (SELECT? FILE STAT) for each directory entry, where FILE is the entry's absolute file name and STAT is the result of 'lstat'; exclude entries for which SELECT? does not return true." (lambda (store) (values (add-to-store store (or name (basename file)) recursive? "sha256" file #:select? select?) store))) (define build ;; Monadic variant of 'build-things'. (store-lift build-things)) (define set-build-options* (store-lift set-build-options)) (define references* (store-lift references)) (define-inlinable (current-system) ;; Consult the %CURRENT-SYSTEM fluid at bind time. This is equivalent to ;; (lift0 %current-system %store-monad), but inlinable, thus avoiding ;; closure allocation in some cases. (lambda (state) (values (%current-system) state))) (define-inlinable (set-current-system system) ;; Set the %CURRENT-SYSTEM fluid at bind time. (lambda (state) (values (%current-system system) state))) (define %guile-for-build ;; The derivation of the Guile to be used within the build environment, ;; when using 'gexp->derivation' and co. (make-parameter #f)) (define* (run-with-store store mval #:key (guile-for-build (%guile-for-build)) (system (%current-system))) "Run MVAL, a monadic value in the store monad, in STORE, an open store connection, and return the result." ;; Initialize the dynamic bindings here to avoid bad surprises. The ;; difficulty lies in the fact that dynamic bindings are resolved at ;; bind-time and not at call time, which can be disconcerting. (parameterize ((%guile-for-build guile-for-build) (%current-system system) (%current-target-system #f)) (call-with-values (lambda () (run-with-state mval store)) (lambda (result store) ;; Discard the state. result)))) ;;; ;;; Store paths. ;;; (define %store-prefix ;; Absolute path to the Nix store. (make-parameter %store-directory)) (define (store-path? path) "Return #t if PATH is a store path." ;; This is a lightweight check, compared to using a regexp, but this has to ;; be fast as it's called often in `derivation', for instance. ;; `isStorePath' in Nix does something similar. (string-prefix? (%store-prefix) path)) (define (direct-store-path? path) "Return #t if PATH is a store path, and not a sub-directory of a store path. This predicate is sometimes needed because files *under* a store path are not valid inputs." (and (store-path? path) (not (string=? path (%store-prefix))) (let ((len (+ 1 (string-length (%store-prefix))))) (not (string-index (substring path len) #\/))))) (define (direct-store-path path) "Return the direct store path part of PATH, stripping components after '/gnu/store/xxxx-foo'." (let ((prefix-length (+ (string-length (%store-prefix)) 35))) (if (> (string-length path) prefix-length) (let ((slash (string-index path #\/ prefix-length))) (if slash (string-take path slash) path)) path))) (define (derivation-path? path) "Return #t if PATH is a derivation path." (and (store-path? path) (string-suffix? ".drv" path))) (define store-regexp* ;; The substituter makes repeated calls to 'store-path-hash-part', hence ;; this optimization. (mlambda (store) "Return a regexp matching a file in STORE." (make-regexp (string-append "^" (regexp-quote store) "/([0-9a-df-np-sv-z]{32})-([^/]+)$")))) (define (store-path-package-name path) "Return the package name part of PATH, a file name in the store." (let ((path-rx (store-regexp* (%store-prefix)))) (and=> (regexp-exec path-rx path) (cut match:substring <> 2)))) (define (store-path-hash-part path) "Return the hash part of PATH as a base32 string, or #f if PATH is not a syntactically valid store path." (let ((path-rx (store-regexp* (%store-prefix)))) (and=> (regexp-exec path-rx path) (cut match:substring <> 1)))) (define (log-file store file) "Return the build log file for FILE, or #f if none could be found. FILE must be an absolute store file name, or a derivation file name." (cond ((derivation-path? file) (let* ((base (basename file)) (log (string-append (dirname %state-directory) ; XXX "/log/guix/drvs/" (string-take base 2) "/" (string-drop base 2))) (log.bz2 (string-append log ".bz2"))) (cond ((file-exists? log.bz2) log.bz2) ((file-exists? log) log) (else #f)))) (else (match (valid-derivers store file) ((derivers ...) ;; Return the first that works. (any (cut log-file store <>) derivers)) (_ #f)))))