/usr/share/racket/collects/setup/unpack.rkt is in racket-common 6.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(require file/gunzip
racket/file
racket/list
racket/port
racket/bool
net/base64
setup/getinfo
racket/match
"dirs.rkt")
(provide unpack
fold-plt-archive)
;; ----------------------------------------
;; Returns a port and a kill thunk
(define (port64gz->port p64gz)
;; Inflate in a thread so the whole input isn't read at once
(let-values ([(base64-out base64-in) (make-pipe 4096)]
[(guz-out guz-in) (make-pipe 4096)])
(let ([64t
(thread (lambda ()
(dynamic-wind
void
(lambda () (base64-decode-stream p64gz base64-in))
(lambda () (close-output-port base64-in)))))]
[gzt
(thread (lambda ()
(dynamic-wind
void
(lambda () (gunzip-through-ports base64-out guz-in))
(lambda () (close-output-port guz-in)))))])
(values guz-out (lambda () (kill-thread 64t) (kill-thread gzt))))))
;; ------------------------------------------------------------
;; fold-plt-archive : path[to .plt file] (sexpr A -> A) (sexpr input-port A -> A) (path A -> A) (path input-port A -> A) A -> A
(define (fold-plt-archive filename on-config-fn on-setup-unit on-directory on-file initial-value)
(let*-values ([(fip) (open-input-file filename)]
[(ip kill) (port64gz->port fip)])
(dynamic-wind
void
(λ () (fold-plt-archive-port ip on-config-fn on-setup-unit on-directory on-file initial-value))
(λ ()
(close-input-port fip)
(kill)))))
;; fold-plt-archive-port : input-port (sexpr A -> A) (sexpr input-port A -> A) (path A -> A) (path input-port A -> A) A -> A
(define (fold-plt-archive-port p on-config-fn on-setup-unit on-directory on-file initial-value)
;; skip past the initial #"PLT" and two sexprs
(unless (and (eq? #\P (read-char p))
(eq? #\L (read-char p))
(eq? #\T (read-char p)))
(error "not an unpackable distribution archive"))
(let* ([config-fn-sexpr (read p)]
[_ (when (eof-object? config-fn-sexpr) (error "malformed input"))]
[val (on-config-fn config-fn-sexpr initial-value)]
[setup-unit (read p)]
[_ (when (eof-object? setup-unit) (error "malformed input"))]
[val (on-setup-unit setup-unit p val)])
;; read contents of file directly. [on-setup-unit may have consumed all input,
;; but if so this loop will just do nothing.]
(let loop ([val val])
(let ([kind (read p)])
(cond
[(eof-object? kind) val]
[else
(case kind
[(dir)
(let* ([v (read p)]
[s (expr->path-descriptor v)])
(unless (relative-path-descriptor? s)
(error "expected a directory name relative path string, got" s))
(let ([next-val (on-directory s val)])
(loop next-val)))]
[(file file-replace)
(let* ([v (read p)]
[s (expr->path-descriptor v)])
(unless (relative-path-descriptor? s)
(error "expected a file name relative path string, got" s))
(let ([len (read p)])
(unless (and (number? len) (integer? len))
(error "expected a file name size, got" len))
;; Find starting *
(let loop ()
(let ([c (read-char p)])
(cond [(char=? c #\*) (void)] ; found it
[(char-whitespace? c) (loop)]
[(eof-object? c) (void)] ; signal the error below
[else (error
(format "unexpected character setting up ~a, looking for *" s)
c)])))
(let-values ([(control fp) (protected-limited-input-port p len)])
(let ([next-val (if (procedure-arity-includes? on-file 4)
(on-file s fp kind val)
(on-file s fp val))])
(exhaust-port control)
(loop next-val)))))]
[else (error "unknown file tag" kind)])])))))
;; path-descriptor ::= 'same | (list location path)
;; location ::= symbol in '(same collects doc lib include)
;; expr->path-descriptor : sexpr -> path-descriptor
;; extracts a path-descriptor from an sexpr embedded in a .plt file
;; raises an error if the given sexpr can't be converted to a path descriptor
(define (expr->path-descriptor v)
(cond
[(null? v) 'same]
[(and (pair? v) (symbol? (car v)) (symbol=? (car v) 'same))
(apply build-path 'same (cdr v))]
[(and (pair? v) (string? (car v)))
(let ([location (string->loc (car v))])
(if (eq? location 'relative)
(apply build-path v)
(if (null? (cdr v))
(list location (build-path/convention-type (system-path-convention-type) 'same))
(list location (apply build-path (cdr v))))))]
[else (error "malformed path description: " v)]))
;; string->loc : string -> location
;; converts the string into a corresponding location, or raises an error
;; if that is not possible
(define (string->loc str)
(let ([loc (string->symbol str)])
(cond
[(memq loc '(collects doc lib include same)) loc]
[else 'relative])))
;; relative-path-descriptor? : path-descriptor -> boolean
;; determines if the given path descriptor names a relative file rather
;; than an absolute one
(define (relative-path-descriptor? s)
(or (eq? s 'same)
(and (path? s) (relative-path? s))
(relative-path? (cadr s))))
;; protected-limited-output-port input-port n -> (values input-port input-port)
;; returns two input ports. the first reads from the given input port, and the second
;; reads from the first.
;; why would you ever want to do this? So that you can hand out the second, and then
;; regardless of whether the user closes it or not you still have a limited input port
;; you can read to exhaustion.
(define (protected-limited-input-port ip limit)
(let* ([i2 (make-limited-input-port ip limit #f)]
[i3 (make-limited-input-port i2 limit #f)])
(values i2 i3)))
;; exhaust-port : input-port -> void
;; consumes all input on the given port
(define exhaust-port
(let ([nowhere (open-output-nowhere)])
(λ (ip) (copy-port ip nowhere))))
;; ------------------------------------------------------------
(define (pretty-name f)
(with-handlers ([void (lambda (x) f)])
(let-values ([(base name dir?) (split-path f)])
(format "~a in ~a"
(path->string name)
(if (path? base) (path->string base) base)))))
(define (shuffle-path parent-dir get-dir shuffle? v)
(if shuffle?
;; Re-arrange for "collects', etc.
(let ([v (remq* '(same) v)])
(if (null? v)
(values #f 'same)
(let ([dir
(case (string->symbol (car v))
[(collects) (get-dir find-collects-dir find-user-collects-dir)]
[(doc) (get-dir find-doc-dir find-user-doc-dir)]
[(lib) (get-dir find-lib-dir find-user-lib-dir)]
[(include) (get-dir find-include-dir find-user-include-dir)]
[else #f])])
(if dir
(if (null? (cdr v))
(values dir 'same)
(values dir (apply build-path (cdr v))))
(values parent-dir (apply build-path v))))))
(values parent-dir (if (null? v) 'same (apply build-path v)))))
(define (unmztar p filter parent-dir get-dir shuffle? print-status)
(define bufsize 4096)
(define buffer (make-bytes bufsize))
(let loop ()
(let ([kind (read p)])
(unless (eof-object? kind)
(case kind
[(dir) (let-values ([(target-dir s)
(shuffle-path parent-dir get-dir shuffle? (read p))])
(unless (or (eq? s 'same) (relative-path? s))
(error "expected a directory name relative path string, got" s))
(when (and target-dir
(or (eq? s 'same) (filter 'dir s target-dir)))
(let ([d (build-path target-dir s)])
(unless (directory-exists? d)
(print-status
(format " making directory ~a" (pretty-name d)))
(make-directory* d)))))]
[(file file-replace)
(let-values ([(target-dir s)
(shuffle-path parent-dir get-dir shuffle? (read p))])
(unless (relative-path? s)
(error "expected a file name relative path string, got" s))
(let ([len (read p)])
(unless (and (number? len) (integer? len))
(error "expected a file name size, got" len))
(let* ([write? (filter kind s target-dir)]
[path (build-path target-dir s)])
(let ([out (and write?
(if (file-exists? path)
(if (eq? kind 'file)
#f
(open-output-file path #:exists 'truncate))
(open-output-file path)))])
(when (and write? (not out))
(print-status (format " skipping ~a; already exists" (pretty-name path))))
(when out
(print-status (format " unpacking ~a" (pretty-name path))))
;; Find starting *
(let loop ()
(let ([c (read-char p)])
(cond [(char=? c #\*) (void)] ; found it
[(char-whitespace? c) (loop)]
[(eof-object? c) (void)] ; signal the error below
[else (error
(format "unexpected character setting up ~a, looking for *"
path)
c)])))
;; Copy file data
(let loop ([n len])
(unless (zero? n)
(let ([l (read-bytes! buffer p 0 (min n bufsize))])
(when (eof-object? l)
(error (format
"unexpected end-of-file while ~a ~a (at ~a of ~a)"
(if out "unpacking" "skipping")
path
(- len n -1) len)))
(when out (write-bytes buffer out 0 l))
(loop (- n l)))))
(when out (close-output-port out))))))]
[else (error "unknown file tag" kind)])
(loop)))))
(define (call-info info flag mk-default test)
(if info
(let ([v (info flag mk-default)]) (test v) v)
(mk-default)))
(define unpack
(lambda (archive
[main-collects-parent-dir (current-directory)]
[print-status (lambda (x) (printf "~a\n" x))]
[get-target-directory (lambda () (current-directory))]
[force? #f]
[get-target-plt-directory
(lambda (preferred main-collects-parent-dir options)
preferred)])
(let*-values ([(p64gz) (open-input-file archive)]
[(p kill) (port64gz->port p64gz)])
(dynamic-wind
void
(lambda ()
(unless (and (eq? #\P (read-char p))
(eq? #\L (read-char p))
(eq? #\T (read-char p)))
(error "not an unpackable distribution archive"))
(let* ([info (let ([v (read p)])
(match v
[`(lambda (request failure)
(case request
[(name) ,name]
[(unpacker) 'mzscheme]
[(requires) ',requires]
[(conflicts) ',conflicts]
[(plt-relative?) ,plt-relative?]
[(plt-home-relative?) ,plt-home-relative?]
. ,(or `([(test-plt-dirs) ,test-dirs] ; #f or `(quote ,dirs)
[else (failure)])
`([,(and 'else test-dirs) (failure)]))))
(lambda (request failure)
(case request
[(name) name]
[(unpacker) 'mzscheme]
[(requires) requires]
[(conflicts) conflicts]
[(plt-relative?) plt-relative?]
[(plt-home-relative?) plt-home-relative?]
[(test-plt-dirs) (and test-dirs
(not (eq? test-dirs 'else))
(cadr test-dirs))]
[else (failure)]))]
[else
(error "info-procedure S-expression did not have the expected shape: "
v)]))])
(unless (and (procedure? info)
(procedure-arity-includes? info 2))
(error "expected a procedure of arity 2, got" info))
(let ([name (call-info info 'name (lambda () #f)
(lambda (n)
(unless (string? n)
(if n
(error "couldn't find the package name")
(error "expected a string")))))]
[unpacker (call-info info 'unpacker (lambda () #f)
(lambda (n)
(unless (eq? n 'mzscheme)
(error "unpacker isn't mzscheme:" n))))]
[target-dir-info
(let ([rel? (call-info info 'plt-relative? (lambda () #f) values)]
[not-user-rel? (call-info info 'plt-home-relative? (lambda () #f) values)]
[test-dirs (call-info info 'test-plt-dirs (lambda () #f) values)])
(if rel?
;; Shuffling...
(if (and not-user-rel?
;; Check for void because old unpacker didn't use
;; the failure thunk.
(not (void? not-user-rel?))
;; Non-user optional if test-dirs are writable
(or (not test-dirs)
(andmap
(lambda (p)
(and (string? p)
(let ([dir (let-values ([(base dir)
(shuffle-path main-collects-parent-dir
(lambda (a b) (a))
#t (list p))])
(build-path base dir))])
(memq 'write
(with-handlers ([exn:fail:filesystem? (lambda (x) null)])
(file-or-directory-permissions dir))))))
test-dirs)))
;; Shuffle to main directory always:
(let ([dir (get-target-plt-directory main-collects-parent-dir
main-collects-parent-dir
(list main-collects-parent-dir))])
(list dir (lambda (sys user)
(let ([a (sys)])
(get-target-plt-directory a a (list a))))))
;; Prefer to shuffle to user directory:
(let ([addons (find-user-collects-dir)])
(let ([dir (get-target-plt-directory
addons
main-collects-parent-dir
(list addons main-collects-parent-dir))])
(list dir (lambda (sys user)
(let ([a (sys)]
[b (user)])
(get-target-plt-directory b a (list b a))))))))
;; No shuffling --- install to target directory:
(list (get-target-directory))))])
;; Stop if no target directory:
(if (car target-dir-info)
;; Check declared dependencies (none means v103)
(begin
(call-info
info 'requires (lambda () null)
(lambda (l)
(define (bad)
(error "`requires' info is corrupt:" l))
(when (void? l)
(if force?
(print-status "warning: archive is for an older version of Racket")
(error "cannot install; archive is for an older version of Racket")))
(unless (or (list? l) (and force? (void? l)))
(bad))
;; Check each dependency:
(when (list? l)
(for-each
(lambda (d)
(unless (and (list? d) (= 2 (length d)))
(bad))
(let ([coll-path (car d)]
[version (cadr d)])
(unless (and (pair? coll-path)
(list? coll-path)
(andmap string? coll-path)
(list? version)
(andmap number? version))
(bad))
(with-handlers ([exn:fail:filesystem?
(lambda (x)
(if force?
(print-status
(format "warning: missing required collection ~s" coll-path))
(error "cannot install; missing required collection" coll-path)))])
(apply collection-path coll-path))
(let ([inst-version
(with-handlers ([void (lambda (x)
(if (exn:break? x)
(raise x)
null))])
(let ([info (get-info coll-path)])
(info 'version (lambda () null))))])
(let loop ([v version][iv inst-version])
(unless (null? v)
(when (or (null? iv)
(not (= (car v) (car iv))))
(let ([msg (format "version ~a of collection ~s is required, but version ~a is installed"
version coll-path
(if (null? inst-version)
'<unknown>
inst-version))])
(if force?
(print-status (format "warning: ~a" msg))
(error (format "cannot install; ~a" msg)))))
(loop (cdr v) (cdr iv)))))))
l))))
;; Check for conflicts:
(call-info
info 'conflicts (lambda () null)
(lambda (l)
(define (bad)
(error "`conflicts' info is corrupt:" l))
(unless (or (list? l) (and force? (void? l)))
(bad))
(when (list? l)
(for-each
(lambda (coll-path)
(unless (and (pair? coll-path)
(list? coll-path)
(andmap string? coll-path))
(bad))
(when (with-handlers ([exn:fail? (lambda (x) #f)])
(apply collection-path coll-path))
(error "cannot install; conflict with installed collection"
coll-path)))
l))))
(unless (and name unpacker)
(error "bad name or unpacker"))
(print-status (format "Unpacking ~a from ~a" name archive))
(let ([u (read p)])
(match u
[`(unit (import ,(? symbol?) mzuntar)
(export)
(mzuntar void)
(quote ,collections))
(make-directory* (car target-dir-info))
(unmztar p void
(car target-dir-info)
(lambda (a b)
((cadr target-dir-info) a b))
((length target-dir-info) . > . 1)
print-status)
collections]
[else
(error "expected a `unit' pattern, got" u)])))
;; Cancelled: no collections
null))))
(lambda () (kill) (close-input-port p64gz))))))
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