Arch Linux

FernandoBasso

Member

From: Brazil

Registered: 2010-10-27

Posts: 105

Website

How to craft the URL where where a program is downloaded from?

The company I currently work with is switching from Loom for screen recording to Cap (https://cap.so). Thankfully, it supports Linux, but only provides .deb package.

When I downloaded it from the website, the button shows https://cap.so/download/linux-deb. But after the download starts, and I copy the download link from Firefox download history, then it shows like this:

https://cdn.crabnebula.app/asset/01M2JEFM7ZZKVZT9YPEKWWFPD7?from=%7B%22orgSlug%22%3A%22cap%22%2C%22appSlug%22%3A%22cap%22%2C%22publicPlatform%22%3A%22deb-x86_64%22%7D

The file name it suggests by default is "Cap_0.6.0_amd64.deb".

So my question is: how should I craft that URL into the url field of the PKGBUILD so that when I run makepkg, the download works correctly?

Let me know if any further information is required or would help.

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There is a difference between knowing the path and walking the path.

WorMzy

Administrator

From: Scotland

Registered: 2010-06-16

Posts: 13,662

Website

Re: How to craft the URL where where a program is downloaded from?

Are you talking about automatically renaming a downloaded source file?

It  is  also  possible  to  change the name of the downloaded file, which is
helpful with weird URLs and for handling multiple source files with the same
name. The syntax is: source=('filename::url').

---

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FernandoBasso

Member

From: Brazil

Registered: 2010-10-27

Posts: 105

Website

Re: How to craft the URL where where a program is downloaded from?

No, I mean that I am not sure what I should put in the "url" and the "source" fields of the PKGBUILD.

---

There is a difference between knowing the path and walking the path.

cryptearth

Member

Registered: 2024-02-03

Posts: 2,344

Re: How to craft the URL where where a program is downloaded from?

nothing, because there's a arch pkg already provided: https://cap.so/download/versions
https://cap.so/download/linux-pacman

Last edited by cryptearth (Today 05:10:22)

FernandoBasso

Member

From: Brazil

Registered: 2010-10-27

Posts: 105

Website

Re: How to craft the URL where where a program is downloaded from?

nothing, because there's a arch pkg already provided: https://cap.so/download/versions
https://cap.so/download/linux-pacman

That is awesome, thank you!

As a learning opportunity, I'd still like to understand what I should do regarding "url" and "source" for this case.

---

There is a difference between knowing the path and walking the path.

cryptearth

Member

Registered: 2024-02-03

Posts: 2,344

Re: How to craft the URL where where a program is downloaded from?

depends on versioning
packages should have a fixed version - so it should use a fixed url
i also checked thier github but it, too, only contains auto "latest" links which are resolved from the server with a 302 redirect - these are not suitable for a versioned package
here the original dev has to come forward to provide fixed version direct links
i won't rely on the backend cdn links as these are usually auto generated and subject to change

if cap.so only provides one version via a "latest" link it's up to them - nothin a user should try to interfere with

another COULD be: as they provide a public repo one could try to figure out how they built thier package specific to arch and could try to replicate this - but this could also lead to conflicts (naming, licence) - in this very case i would request cap.so to maybe provide an aur -bin package themself - if they deny then you should accept it (although it wouldn't do the community a favor to not utilize existing packaging and version control infrastructure)

DeaD_EyE

Member

Registered: 2022-11-13

Posts: 6

Re: How to craft the URL where where a program is downloaded from?

With curl

URL=$(curl -s -I -w "%header{location}\n" -o /dev/null https://cap.so/download/linux-deb)

Python

from urllib.request import Request, urlopen

url = "https://cap.so/download/linux-deb"
headers = {
    "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:156.0) Gecko/20100101 Firefox/156.0"
}
request = Request(url, method="HEAD", headers=headers)
url = urlopen(request).url

Python with requests

import requests

url = requests.head("https://cap.so/download/linux-deb").headers.get("location")