Re: [racket-users] How to identify the target of a symlink?

[David Storrs]

Thanks, Jon.  I would not have thought to check Paths.  (Obviously.)

Thanks, Neil.  canonicalize-path looks useful, and my software is
mostly going to be used on OSX and/or Linux, so it's a good fit.


Dave

On Thu, Sep 28, 2017 at 7:32 PM, Jon Zeppieri  wrote:
> https://docs.racket-lang.org/reference/Manipulating_Paths.html?q=resolve-path#%28def._%28%28quote._~23~25kernel%29._resolve-path%29%29
>
> On Thu, Sep 28, 2017 at 5:50 PM, David Storrs  wrote:
>> The link-exists? function will tell me that something is a symlink.
>> How do I tell what it's pointing to?
>>
>> I'm writing code that must move data from one computer to another, and
>> I need a way to say "create the file here and put the data in it" vs
>> "create a symlink here that points to a file over there and put the
>> data in the file"
>>
>> I've been through the Filesystem[1] docs, which offer:
>>
>> link-exists?   ; Is it a link?
>>
>> file-or-directory-identity (with as-link? #t) ; get the identity of a
>> file, which can prove that a link isn't the same as the file that it
>> points to, but doesn't help me find the target
>>
>> find-executable-file can track through a chain of links so presumably
>> there is some way to do it.  Various other functions (e.g. copy-file)
>> also can distinguish between links and not-links.
>>
>>
>> A general search of the docs yields a lot of hits to html- and
>> collection-related things, but nothing that seems to solve my problem.
>>
>> [1] https://docs.racket-lang.org/reference/Filesystem.html
>>
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Re: [racket-users] How to identify the target of a symlink?

[Neil Van Dyke]

Hopefully the core Racket stuff does what you need.  If not, you might 
take a look at: http://www.neilvandyke.org/racket/canonicalize-path/


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Re: [racket-users] How to identify the target of a symlink?

[Jon Zeppieri]

https://docs.racket-lang.org/reference/Manipulating_Paths.html?q=resolve-path#%28def._%28%28quote._~23~25kernel%29._resolve-path%29%29

On Thu, Sep 28, 2017 at 5:50 PM, David Storrs  wrote:
> The link-exists? function will tell me that something is a symlink.
> How do I tell what it's pointing to?
>
> I'm writing code that must move data from one computer to another, and
> I need a way to say "create the file here and put the data in it" vs
> "create a symlink here that points to a file over there and put the
> data in the file"
>
> I've been through the Filesystem[1] docs, which offer:
>
> link-exists?   ; Is it a link?
>
> file-or-directory-identity (with as-link? #t) ; get the identity of a
> file, which can prove that a link isn't the same as the file that it
> points to, but doesn't help me find the target
>
> find-executable-file can track through a chain of links so presumably
> there is some way to do it.  Various other functions (e.g. copy-file)
> also can distinguish between links and not-links.
>
>
> A general search of the docs yields a lot of hits to html- and
> collection-related things, but nothing that seems to solve my problem.
>
> [1] https://docs.racket-lang.org/reference/Filesystem.html
>
> --
> You received this message because you are subscribed to the Google Groups 
> "Racket Users" group.
> To unsubscribe from this group and stop receiving emails from it, send an 
> email to racket-users+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.

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