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file/tar: add #:exists-ok? argument

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The new argument is needed to reliably write to a tmp file, for
example, where the existence of the tmp file prevents other processes
from using the same name.
This commit is contained in:
Matthew Flatt 2014-10-18 06:43:58 -05:00
parent ecc1d5dff2
commit ce464810d5
2 changed files with 14 additions and 2 deletions
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12
pkgs/racket-pkgs/racket-doc/file/scribblings/tar.scrbl
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@ -17,6 +17,7 @@ in a link must be less than 100 bytes.}
@defproc[(tar [tar-file path-string?]
[path path-string?] ...
[#:exists-ok? exists-ok? any/c #f]
[#:path-prefix path-prefix (or/c #f path-string?) #f]
[#:get-timestamp get-timestamp
(path? . -> . exact-integer?)
@ -33,13 +34,18 @@ to the current directory). If a nested path is provided as a
resulting tar file, up to the current directory (using
@racket[pathlist-closure]).
If @racket[exists-ok?] is @racket[#f], then an exception is raised if
@racket[tar-file] exists already. If @racket[exists-ok?] is true, then
@racket[tar-file] is truncated or replaced if it exists already.
If @racket[path-prefix] is not @racket[#f], then it is prefixed to
each path in the archive.
The @racket[get-timestamp] function is used to obtain the modification
date to record in the archive for each file or directory.
@history[#:changed "6.0.0.3" @elem{Added the @racket[#:get-timestamp] argument.}]}
@history[#:changed "6.0.0.3" @elem{Added the @racket[#:get-timestamp] argument.}
#:changed "6.1.1.1" @elem{Added the @racket[#:exists-ok?] argument.}]}
@defproc[(tar->output [paths (listof path?)]
@ -63,6 +69,7 @@ without parent directories.
@defproc[(tar-gzip [tar-file path-string?]
[paths path-string?] ...
[#:exists-ok? exists-ok? any/c #f]
[#:path-prefix path-prefix (or/c #f path-string?) #f]
[#:get-timestamp get-timestamp
(path? . -> . exact-integer?)
@ -73,4 +80,5 @@ without parent directories.
Like @racket[tar], but compresses the resulting file with @racket[gzip].
@history[#:changed "6.0.0.3" @elem{Added the @racket[#:get-timestamp] argument.}]}
@history[#:changed "6.0.0.3" @elem{Added the @racket[#:get-timestamp] argument.}
#:changed "6.1.1.1" @elem{Added the @racket[#:exists-ok?] argument.}]}

4
racket/collects/file/tar.rkt
View File

@ -149,11 +149,13 @@
;; tar : output-file paths ->
(provide tar)
(define (tar tar-file
#:exists-ok? [exists-ok? #f]
#:path-prefix [prefix #f]
#:get-timestamp [get-timestamp file-or-directory-modify-seconds]
. paths)
(when (null? paths) (error 'tar "no paths specified"))
(with-output-to-file tar-file
#:exists (if exists-ok? 'truncate/replace 'error)
(lambda () (tar->output (pathlist-closure paths #:follow-links? #f)
#:get-timestamp get-timestamp
#:path-prefix prefix))))
@ -161,11 +163,13 @@
;; tar-gzip : output-file paths ->
(provide tar-gzip)
(define (tar-gzip tgz-file
#:exists-ok? [exists-ok? #f]
#:path-prefix [prefix #f]
#:get-timestamp [get-timestamp file-or-directory-modify-seconds]
. paths)
(when (null? paths) (error 'tar-gzip "no paths specified"))
(with-output-to-file tgz-file
#:exists (if exists-ok? 'truncate/replace 'error)
(lambda ()
(let-values ([(i o) (make-pipe (* 1024 1024 32))])
(thread (lambda ()