Armbian Linux Kernel Caching

# Preface - Full, non-shallow clones of Linux kernel trees are multiple gigabytes in size, and take a lot of time to process, - Shallow clones are much smaller, but cloning/fetching shallow trees impose a huge load on the git server (eg: `kernel.org`), - `kernel.org` has [git bundles](https://git-scm.com/docs/git-bundle) available for download over HTTPS/CDN (simple file download). In fact they [recommend their use](https://www.kernel.org/best-way-to-do-linux-clones-for-your-ci.html) and have [instructions](https://www.kernel.org/cloning-linux-from-a-bundle.html) ## What this repo does? - it does the heavy lifting - grabbing bundles, updating them from live git servers, and makes them shallow and ready for consumption, - Produced shallow bundles are around 250mb as of 5.18, - Produced shallow bundles include all tags for the version involved, including `-rc` tags, - Scheduled runs update the bundles every 24hs, using GitHub actions, including caching, - They are deployed to two locations, as [Github releases](https://github.com/armbian/gitutils/releases/latest) and uploaded to main [Armbian CDN](https://dl.armbian.com/_gitbundles/) ## How to use - Example for 5.17: ```bash # Download the bundle from this repo's Github releases. wget --continue --progress=dot:giga -O "linux-5.17.gitbundle" "https://github.com/armbian/gitutils/releases/download/latest/linux-5.17.gitbundle" git init linux-5.17 # init an empty repo cd linux-5.17 # go into it git remote add "linux-5.17-bundle" "../linux-5.17.gitbundle" # add the downloaded bundle as a remote wget -O ".git/shallow" "https://github.com/armbian/gitutils/releases/download/latest/linux-5.17.gitshallow" # download .git/shallow git fetch linux-5.17-bundle # fetch from the bundle. git checkout FETCH_HEAD # checkout from the bundle's HEAD git tag -l # look at the available tags (all 5.17-related tags) ```