diff options
Diffstat (limited to 'gnu/packages.scm')
| -rw-r--r-- | gnu/packages.scm | 127 |
1 files changed, 124 insertions, 3 deletions
diff --git a/gnu/packages.scm b/gnu/packages.scm index 4a85cf4b87..6796db80a4 100644 --- a/gnu/packages.scm +++ b/gnu/packages.scm @@ -28,11 +28,14 @@ #:use-module (guix memoization) #:use-module ((guix build utils) #:select ((package-name->name+version - . hyphen-separated-name->name+version))) + . hyphen-separated-name->name+version) + mkdir-p)) #:autoload (guix profiles) (packages->manifest) #:use-module (guix describe) #:use-module (ice-9 vlist) #:use-module (ice-9 match) + #:autoload (ice-9 binary-ports) (put-bytevector) + #:autoload (system base compile) (compile) #:use-module (srfi srfi-1) #:use-module (srfi srfi-11) #:use-module (srfi srfi-26) @@ -56,7 +59,9 @@ specification->package specification->package+output - specifications->manifest)) + specifications->manifest + + generate-package-cache)) ;;; Commentary: ;;; @@ -135,6 +140,14 @@ for system '~a'") ;; Default search path for package modules. `((,%distro-root-directory . "gnu/packages"))) +(define (cache-is-authoritative?) + "Return true if the pre-computed package cache is authoritative. It is not +authoritative when entries have been added via GUIX_PACKAGE_PATH or '-L' +flags." + (equal? (%package-module-path) + (append %default-package-module-path + (package-path-entries)))) + (define %package-module-path ;; Search path for package modules. Each item must be either a directory ;; name or a pair whose car is a directory and whose cdr is a sub-directory @@ -183,7 +196,35 @@ is guaranteed to never traverse the same package twice." init modules)) -(define find-packages-by-name +(define %package-cache-file + ;; Location of the package cache. + "/lib/guix/package.cache") + +(define load-package-cache + (mlambda (profile) + "Attempt to load the package cache. On success return a vhash keyed by +package names. Return #f on failure." + (match profile + (#f #f) + (profile + (catch 'system-error + (lambda () + (define lst + (load-compiled (string-append profile %package-cache-file))) + (fold (lambda (item vhash) + (match item + (#(name version module symbol outputs + supported? deprecated? + file line column) + (vhash-cons name item vhash)))) + vlist-null + lst)) + (lambda args + (if (= ENOENT (system-error-errno args)) + #f + (apply throw args)))))))) + +(define find-packages-by-name/direct ;bypass the cache (let ((packages (delay (fold-packages (lambda (p r) (vhash-cons (package-name p) p r)) @@ -202,6 +243,37 @@ decreasing version order." matching) matching))))) +(define (cache-lookup cache name) + "Lookup package NAME in CACHE. Return a list sorted in increasing version +order." + (define (package-version<? v1 v2) + (version>? (vector-ref v2 1) (vector-ref v1 1))) + + (sort (vhash-fold* cons '() name cache) + package-version<?)) + +(define* (find-packages-by-name name #:optional version) + "Return the list of packages with the given NAME. If VERSION is not #f, +then only return packages whose version is prefixed by VERSION, sorted in +decreasing version order." + (define cache + (load-package-cache (current-profile))) + + (if (and (cache-is-authoritative?) cache) + (match (cache-lookup cache name) + (#f #f) + ((#(_ versions modules symbols _ _ _ _ _ _) ...) + (fold (lambda (version* module symbol result) + (if (or (not version) + (version-prefix? version version*)) + (cons (module-ref (resolve-interface module) + symbol) + result) + result)) + '() + versions modules symbols))) + (find-packages-by-name/direct name version))) + (define (find-best-packages-by-name name version) "If version is #f, return the list of packages named NAME with the highest version numbers; otherwise, return the list of packages named NAME and at @@ -218,6 +290,55 @@ VERSION." (string=? (package-version p) highest)) matches)))))) +(define (generate-package-cache directory) + "Generate under DIRECTORY a cache of all the available packages. + +The primary purpose of the cache is to speed up package lookup by name such +that we don't have to traverse and load all the package modules, thereby also +reducing the memory footprint." + (define cache-file + (string-append directory %package-cache-file)) + + (define (expand-cache module symbol variable result) + (match (false-if-exception (variable-ref variable)) + ((? package? package) + (if (hidden-package? package) + result + (cons `#(,(package-name package) + ,(package-version package) + ,(module-name module) + ,symbol + ,(package-outputs package) + ,(->bool (member (%current-system) + (package-supported-systems package))) + ,(->bool (package-superseded package)) + ,@(let ((loc (package-location package))) + (if loc + `(,(location-file loc) + ,(location-line loc) + ,(location-column loc)) + '(#f #f #f)))) + result))) + (_ + result))) + + (define exp + (fold-module-public-variables* expand-cache '() + (all-modules (%package-module-path) + #:warn + warn-about-load-error))) + + (mkdir-p (dirname cache-file)) + (call-with-output-file cache-file + (lambda (port) + ;; Store the cache as a '.go' file. This makes loading fast and reduces + ;; heap usage since some of the static data is directly mmapped. + (put-bytevector port + (compile `'(,@exp) + #:to 'bytecode + #:opts '(#:to-file? #t))))) + cache-file) + (define %sigint-prompt ;; The prompt to jump to upon SIGINT. |