store: Add store path computation procedures.
* guix/derivations.scm (compressed-hash, store-path) (output-path, fixed-output-path): Move to... * guix/store.scm: ... here.
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Ludovic Courtès
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4032dd81d5
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cd041b268e
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@ -76,7 +76,6 @@
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derivation-name
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derivation-output-names
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fixed-output-derivation?
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fixed-output-path
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offloadable-derivation?
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substitutable-derivation?
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substitution-oracle
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@ -614,20 +613,6 @@ list of name/path pairs of its outputs."
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;;; Derivation primitive.
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;;;
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(define (compressed-hash bv size) ; `compressHash'
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"Given the hash stored in BV, return a compressed version thereof that fits
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in SIZE bytes."
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(define new (make-bytevector size 0))
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(define old-size (bytevector-length bv))
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(let loop ((i 0))
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(if (= i old-size)
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new
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(let* ((j (modulo i size))
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(o (bytevector-u8-ref new j)))
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(bytevector-u8-set! new j
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(logxor o (bytevector-u8-ref bv i)))
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(loop (+ 1 i))))))
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(define derivation-path->base16-hash
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(mlambda (file)
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"Return a string containing the base16 representation of the hash of the
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@ -674,43 +659,6 @@ derivation at FILE."
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;; character.
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(sha256 (derivation->bytevector drv)))))))
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(define (store-path type hash name) ; makeStorePath
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"Return the store path for NAME/HASH/TYPE."
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(let* ((s (string-append type ":sha256:"
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(bytevector->base16-string hash) ":"
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(%store-prefix) ":" name))
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(h (sha256 (string->utf8 s)))
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(c (compressed-hash h 20)))
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(string-append (%store-prefix) "/"
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(bytevector->nix-base32-string c) "-"
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name)))
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(define (output-path output hash name) ; makeOutputPath
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"Return an output path for OUTPUT (the name of the output as a string) of
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the derivation called NAME with hash HASH."
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(store-path (string-append "output:" output) hash
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(if (string=? output "out")
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name
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(string-append name "-" output))))
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(define* (fixed-output-path name hash
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#:key
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(output "out")
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(hash-algo 'sha256)
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(recursive? #t))
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"Return an output path for the fixed output OUTPUT defined by HASH of type
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HASH-ALGO, of the derivation NAME. RECURSIVE? has the same meaning as for
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'add-to-store'."
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(if (and recursive? (eq? hash-algo 'sha256))
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(store-path "source" hash name)
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(let ((tag (string-append "fixed:" output ":"
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(if recursive? "r:" "")
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(symbol->string hash-algo) ":"
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(bytevector->base16-string hash) ":")))
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(store-path (string-append "output:" output)
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(sha256 (string->utf8 tag))
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name))))
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(define* (derivation store name builder args
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#:key
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(system (%current-system)) (env-vars '())
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@ -23,7 +23,8 @@
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#:use-module (guix serialization)
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#:use-module (guix monads)
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#:use-module (guix base16)
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#:autoload (guix base32) (bytevector->base32-string)
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#:use-module (guix base32)
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#:use-module (guix hash)
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#:autoload (guix build syscalls) (terminal-columns)
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#:use-module (rnrs bytevectors)
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#:use-module (ice-9 binary-ports)
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@ -133,6 +134,9 @@
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interned-file
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%store-prefix
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store-path
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output-path
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fixed-output-path
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store-path?
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direct-store-path?
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derivation-path?
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@ -1347,6 +1351,57 @@ connection, and return the result."
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;; Absolute path to the Nix store.
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(make-parameter %store-directory))
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(define (compressed-hash bv size) ; `compressHash'
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"Given the hash stored in BV, return a compressed version thereof that fits
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in SIZE bytes."
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(define new (make-bytevector size 0))
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(define old-size (bytevector-length bv))
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(let loop ((i 0))
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(if (= i old-size)
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new
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(let* ((j (modulo i size))
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(o (bytevector-u8-ref new j)))
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(bytevector-u8-set! new j
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(logxor o (bytevector-u8-ref bv i)))
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(loop (+ 1 i))))))
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(define (store-path type hash name) ; makeStorePath
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"Return the store path for NAME/HASH/TYPE."
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(let* ((s (string-append type ":sha256:"
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(bytevector->base16-string hash) ":"
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(%store-prefix) ":" name))
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(h (sha256 (string->utf8 s)))
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(c (compressed-hash h 20)))
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(string-append (%store-prefix) "/"
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(bytevector->nix-base32-string c) "-"
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name)))
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(define (output-path output hash name) ; makeOutputPath
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"Return an output path for OUTPUT (the name of the output as a string) of
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the derivation called NAME with hash HASH."
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(store-path (string-append "output:" output) hash
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(if (string=? output "out")
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name
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(string-append name "-" output))))
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(define* (fixed-output-path name hash
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#:key
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(output "out")
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(hash-algo 'sha256)
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(recursive? #t))
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"Return an output path for the fixed output OUTPUT defined by HASH of type
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HASH-ALGO, of the derivation NAME. RECURSIVE? has the same meaning as for
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'add-to-store'."
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(if (and recursive? (eq? hash-algo 'sha256))
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(store-path "source" hash name)
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(let ((tag (string-append "fixed:" output ":"
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(if recursive? "r:" "")
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(symbol->string hash-algo) ":"
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(bytevector->base16-string hash) ":")))
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(store-path (string-append "output:" output)
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(sha256 (string->utf8 tag))
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name))))
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(define (store-path? path)
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"Return #t if PATH is a store path."
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;; This is a lightweight check, compared to using a regexp, but this has to
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