How to download 'latest' version programatically

[rungitringit]

Hello,
I'd like to install this app as a part of a Linux SOE I'm building. I wish to use a native package (deb and rpm) but as there's no repository available, how can I ensure the systems I manage always have the latest version?

Github doesn't provide a 'latest' version tag and while I can see there's a "latest-linux.yml" file available, it only seems to be downloadable from the specific version URL of the release. I won't know these version numbers in advance.

So, how can I programmatically ensure that the latest version of the package is always sourced from here please?

Thank you!

[davidjgraph]

https://docs.github.com/en/repositories/releasing-projects-on-github/linking-to-releases

e.g. https://github.com/jgraph/drawio-desktop/releases/latest

[rungitringit]

Thanks @davidjgraph I didn't realise Github had added that! Awesome that makes life easy for many sources too.

[rungitringit]

Thanks for the link @davidjgraph but I'm afraid this has not been resolved.

I'd love to be able to download a fixed URL for a specific file like: https://github.com/jgraph/drawio-desktop/releases/latest/drawio-amd64-latest.deb or failing that, at least be able to get https://github.com/jgraph/drawio-desktop/releases/latest/latest-linux.yml .

Unfortunately the link you provided, https://github.com/jgraph/drawio-desktop/releases/latest is redirected to a HTML page which contains the links I need. While someone could write some python to parse that, it's beyond my time/ability for now.

EDITS: Clarified and fixed deb reference

[davidjgraph]

OK, then we don't know the answer. It's more a generic github question.

[rungitringit]

OK, then we don't know the answer. It's more a generic github question.

Thanks David. Is there any way you are able to apply a tag to the latest release and remove it from the last release each time you do a release?

I hacked together this work-around script for now, but it is fragile as any change to the download paths, or your version numbering would break it. (EDIT: Someone more confident with regex could probably improve it)

#!/bin/bash
# Potentially fragile script to ensure draw.io electron app is up to date.
# Run from cron once a week.

curl --silent --location --output /tmp/drawio-index.html https://github.com/jgraph/drawio-desktop/releases/latest

# Fragile, index format or filename could change.
URL=$( grep drawio-amd64 /tmp/drawio-index.html | cut -d\" -f2 )

# Fragile, URL could change in future.
SRC_VER=$( echo "${URL}" | cut -d'v' -f2 | cut -d'/' -f1 )

if dpkg-query --show --showformat='${Status}' draw.io | grep --silent ' install'
then
    CUR_VER=$( dpkg-query --show --showformat='${Version}' draw.io )
    if dpkg --compare-versions "${CUR_VER}" "ge" "${SRC_VER}"
    then
        # Current installed version is newer or the same, cleanup and exit
        rm /tmp/drawio-index.html
        exit 0
    fi
fi

curl --silent --location --output /tmp/drawio-x86_64-latest.deb "${URL}"
sudo apt-get install --quiet -y /tmp/drawio-x86_64-latest.deb && rm /tmp/drawio-x86_64-latest.deb
rm /tmp/drawio-index.html