Newbie: How to download mirror: links with wget?

Newbie: How to download mirror: links with wget?

[Rodrigo Morales]

I suspect there's a bug with the =tracker= package, so I want to
investigate. To proceed, I decided to download the source of the
package (relevant part of the package =tracker= is shown below).

#+BEGIN_SRC elisp
(define-public tracker
  (package
    (name "tracker")
    (version "3.4.2")
    (source (origin
              (method url-fetch)
              (uri (string-append "mirror://gnome/sources/tracker/"
                                  (version-major+minor version) "/"
                                  "tracker-" version ".tar.xz"))
              (sha256
               (base32
#+END_SRC

As you can see above, the url of =source= starts with =mirror=. I
thought that I could download such URL with =wget=. However, it seems
that =wget= cannot do that.

#+HEADER: :prologue "exec 2>&1"
#+HEADER: :epilogue ":"
#+begin_src sh
wget "mirror://gnome/sources/tracker/3.4.2/tracker-3.4.2.tar.xz"
echo $?
#+end_src

#+RESULTS:
#+begin_example
mirror://gnome/sources/tracker/3.4.2/tracker-3.4.2.tar.xz: Unsupported scheme.
1
#+end_example

My question is: How can I download the source of that package using
the same URL that is shown in the package definition (I want to make
sure that I'm downloading the same file that is used by the Guix
package definition).

Re: Newbie: How to download mirror: links with wget?

[(]

Hi,

Rodrigo Morales <moralesrodrigo1100@gmail.com> writes:
> #+begin_example
> mirror://gnome/sources/tracker/3.4.2/tracker-3.4.2.tar.xz: Unsupported scheme.
> 1
> #+end_example

`mirror://` is not a real URL schema; it's used by Guix as a substitute
for writing out the various mirror URLs of large projects like GNOME.
Here's the definition of Gnome's mirror URLs:

--- guix/download.scm
(define %mirrors
  ;; Mirror lists used when `mirror://' URLs are passed.
  (let* (…)
    `(…
      (gnome
       "https://download.gnome.org/"
       "http://ftp.gnome.org/pub/GNOME/")
      …)))
---

So the correct URL would be one of these two; by the way, I think that
`mirror://` URL might be wrong, as the `tracker` directories only
contain `3.4`, not `3.4.2`:

  https://download.gnome.org/sources/tracker/3.4/tracker-3.4.2.tar.xz
  http://ftp.gnome.org/pub/GNOME/sources/tracker/3.4/tracker-3.4.2.tar.xz

Both of these work when passed to `guix download`.

Re: Newbie: How to download mirror: links with wget?

[(]

Rodrigo Morales <moralesrodrigo1100@gmail.com> writes:
> #+begin_src sh
> wget "mirror://gnome/sources/tracker/3.4.2/tracker-3.4.2.tar.xz"

Addendum: Yes, this URL is wrong.  The code only takes the major and
minor versions for the first version part; hence `tracker/3.4`, not
`tracker/3.4.2`.

  -- (

Re: Newbie: How to download mirror: links with wget?

[Wojtek Kosior via]

[-- Attachment #1: Type: text/plain, Size: 1427 bytes --]

> My question is: How can I download the source of that package using
> the same URL that is shown in the package definition (I want to make
> sure that I'm downloading the same file that is used by the Guix
> package definition).

Not sure about wget but you can do that with

    guix download 'mirror://gnome/sources/tracker/3.4/tracker-3.4.2.tar.xz'

It will put the tarball in the store and print its path and its hash.
Also, note that you had a mistake in the URL you were trying. It was

    mirror://gnome/sources/tracker/3.4.2/tracker-3.4.2.tar.xz

while it should've been

    mirror://gnome/sources/tracker/3.4/tracker-3.4.2.tar.xz

with minor version omitted in one place.

Best,
Wojtek

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On Fri, 1 Sep 2023 06:33:41 +0000 Rodrigo Morales <moralesrodrigo1100@gmail.com> wrote:

> My question is: How can I download the source of that package using
> the same URL that is shown in the package definition (I want to make
> sure that I'm downloading the same file that is used by the Guix
> package definition).

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