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< h1 > Hello world!< / h1 >
< div class = "lead" > Everything starts from an “ Hello!” < / div >
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< p > This article will guide you to build your first package with Luet!
For this purpose, we have picked a real-world example: < a href = "https://github.com/gogs/gogs" > gogs< / a > which is a “ painless self-hosted Git service” , an open-source alternative to Github.< / p >
< p > Gogs is written in Golang, and we need a working Golang version in order to build it.< / p >
< p > Here you can see a live recorded session of this tutorial:< / p >
< script id = "asciicast-388348" src = "https://asciinema.org/a/388348.js" data-autoplay = "true" data-size = "small" data-cols = "120" data-rows = "40" async > < / script >
< h1 id = "define-a-luet-tree" > Define a Luet tree< / h1 >
< p > Everything starts from a Luet tree. A Luet tree is just a directory containing one (or more) Luet specfile, here on we assume that you are working in a dedicated folder (e.g. < code > ~/demo< / code > ) in your system.< / p >
< p > Let’ s create then a package that will be our base to build other packages from now on, we have picked < code > busybox< / code > here - it is really small and enough for our purpose.< / p >
< h2 id = "busybox" > busybox< / h2 >
< div class = "highlight" > < pre tabindex = "0" style = "background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4" > < code class = "language-bash" data-lang = "bash" > mkdir busybox
< / code > < / pre > < / div > < p > Let’ s now write the build specification, which is just containing the image tag that we are referencing to< / p >
< div class = "highlight" > < pre tabindex = "0" style = "background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4" > < code class = "language-bash" data-lang = "bash" > cat < span style = "color:#4e9a06" > < < EOF > busybox/build.yaml
< / span > < span style = "color:#4e9a06" > image: " busybox:{{.Values.version}}-glibc"
< / span > < span style = "color:#4e9a06" > EOF< / span >
< / code > < / pre > < / div > < p > Now, lets write the < code > definition.yaml< / code > , which contains the metadata information about our package ( e.g. how we refer to it with luet, the version, and so on )< / p >
< div class = "highlight" > < pre tabindex = "0" style = "background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4" > < code class = "language-bash" data-lang = "bash" > cat < span style = "color:#4e9a06" > < < EOF > busybox/definition.yaml
< / span > < span style = "color:#4e9a06" > category: " distro"
< / span > < span style = "color:#4e9a06" > name: " busybox"
< / span > < span style = "color:#4e9a06" > version: " 1.33.0"
< / span > < span style = "color:#4e9a06" > EOF< / span >
< / code > < / pre > < / div > < h2 id = "golang" > golang< / h2 >
< p > We need now golang in order to build < code > gogs< / code > . Let’ s declare then a golang package:< / p >
< div class = "highlight" > < pre tabindex = "0" style = "background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4" > < code class = "language-bash" data-lang = "bash" > mkdir golang
< / code > < / pre > < / div > < p > And a build specfile, which is simply fetch golang from < a href = "https://golang.org" > https://golang.org< / a > and installing it in the busybox container:< / p >
< div class = "highlight" > < pre tabindex = "0" style = "background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4" > < code class = "language-bash" data-lang = "bash" > cat < span style = "color:#4e9a06" > < < EOF > golang/build.yaml
< / span > < span style = "color:#4e9a06" > requires:
< / span > < span style = "color:#4e9a06" > - category: " distro"
< / span > < span style = "color:#4e9a06" > name: " busybox"
< / span > < span style = "color:#4e9a06" > version: " > =0"
< / span > < span style = "color:#4e9a06" >
< / span > < span style = "color:#4e9a06" > prelude:
< / span > < span style = "color:#4e9a06" > - wget https://golang.org/dl/go{{.Values.version}}.linux-{{.Values.arch}}.tar.gz -O golang.tar.gz
< / span > < span style = "color:#4e9a06" > - mkdir /usr/local
< / span > < span style = "color:#4e9a06" > steps:
< / span > < span style = "color:#4e9a06" > - tar -C /usr/local -xzf golang.tar.gz
< / span > < span style = "color:#4e9a06" > EOF< / span >
< / code > < / pre > < / div > < p > Note how we < code > require< / code > busybox. The Golang container will now be based from busybox, and the < code > prelude< / code > and < code > steps< / code > fields will be executed in that context.< / p >
< p > And finally let’ s write the golang metadata files, so we can refer to it from other packages< / p >
< div class = "highlight" > < pre tabindex = "0" style = "background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4" > < code class = "language-bash" data-lang = "bash" > cat < span style = "color:#4e9a06" > < < EOF > golang/definition.yaml
< / span > < span style = "color:#4e9a06" > name: " go"
< / span > < span style = "color:#4e9a06" > category: " dev-lang"
< / span > < span style = "color:#4e9a06" > version: " 1.15.6"
< / span > < span style = "color:#4e9a06" > arch: " amd64"
< / span > < span style = "color:#4e9a06" > EOF< / span >
< / code > < / pre > < / div > < h2 id = "gogs" > gogs< / h2 >
< p > Finally we can write the gogs package definition!< / p >
< div class = "highlight" > < pre tabindex = "0" style = "background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4" > < code class = "language-bash" data-lang = "bash" > mkdir gogs
< / code > < / pre > < / div > < p > The build specfile, will just fetch the < code > gogs< / code > sources at a given version (specified in the < code > definition.yaml< / code > ) and build the sources with go:< / p >
< div class = "highlight" > < pre tabindex = "0" style = "background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4" > < code class = "language-bash" data-lang = "bash" > cat < span style = "color:#4e9a06" > < < ' EOF' > gogs/build.yaml
< / span > < span style = "color:#4e9a06" > requires:
< / span > < span style = "color:#4e9a06" > - category: " dev-lang"
< / span > < span style = "color:#4e9a06" > name: " go"
< / span > < span style = "color:#4e9a06" > version: " > =0"
< / span > < span style = "color:#4e9a06" > env:
< / span > < span style = "color:#4e9a06" > - GOPATH=" /go"
< / span > < span style = "color:#4e9a06" > - GOGSPATH=" $GOPATH/src/github.com/gogs/gogs"
< / span > < span style = "color:#4e9a06" > - PATH=$PATH:/usr/local/go/bin
< / span > < span style = "color:#4e9a06" > - CGO_ENABLED=0
< / span > < span style = "color:#4e9a06" > prelude:
< / span > < span style = "color:#4e9a06" > - mkdir -p $GOPATH/src/github.com/gogs
< / span > < span style = "color:#4e9a06" > - wget https://github.com/gogs/gogs/archive/v{{.Values.version}}.tar.gz -O - | tar -xzf - -C ./ & & mv gogs-{{.Values.version}} $GOGSPATH
< / span > < span style = "color:#4e9a06" > steps:
< / span > < span style = "color:#4e9a06" > - mkdir /usr/bin
< / span > < span style = "color:#4e9a06" > - cd $GOGSPATH & & go build & & mv gogs /usr/bin/gogs
< / span > < span style = "color:#4e9a06" > excludes:
< / span > < span style = "color:#4e9a06" > # Cache generated by Golang
< / span > < span style = "color:#4e9a06" > - ^/root
< / span > < span style = "color:#4e9a06" > EOF< / span >
< / code > < / pre > < / div > < p > And the metadata, in this way we can refer to gogs in a Luet tree:< / p >
< div class = "highlight" > < pre tabindex = "0" style = "background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4" > < code class = "language-bash" data-lang = "bash" > cat < span style = "color:#4e9a06" > < < EOF > gogs/definition.yaml
< / span > < span style = "color:#4e9a06" > category: " dev-vcs"
< / span > < span style = "color:#4e9a06" > name: " gogs"
< / span > < span style = "color:#4e9a06" > version: " 0.11.91"
< / span > < span style = "color:#4e9a06" > EOF< / span >
< / code > < / pre > < / div > < h1 id = "build-packages" > Build packages< / h1 >
< p > The simplest and mostly immediate way to build packages, is running < code > luet build < packagename> < / code > in the same folder you have your Luet tree.< / p >
< p > In this case, to build gogs and its deps, we can do:< / p >
< div class = "highlight" > < pre tabindex = "0" style = "background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4" > < code class = "language-bash" data-lang = "bash" > luet build dev-vcs/gogs
< / code > < / pre > < / div > < p > And that’ s it! you will find the package archives in < code > build/< / code > in the same folder where you started the command.< / p >
< p > You will see that Luet generates not only archives with the file resulting to your builds, but it will also generate metadata files (ending with < code > .metadata.yaml< / code > ) that contains additional metadata information about your build and the package itself (e.g. checksums).< / p >
< p > You can use tools like < a href = "https://github.com/mikefarah/yq" > yq< / a > to inspect those:< / p >
< div class = "highlight" > < pre tabindex = "0" style = "background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4" > < code class = "language-bash" data-lang = "bash" > yq r build/gogs-dev-vcs-0.11.91.metadata.yaml checksums
< / code > < / pre > < / div > < p > Now if you want to consume the artifacts just built with < code > luet install< / code > , you can create a repository with < code > luet create-repo< / code > .< / p >
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Last modified June 24, 2024: < a href = "https://github.com/mudler/luet/commit/afce4b3ce08722d3476e17fc8648790aacf7d153" > ci: bump golang (#359) (afce4b3)< / a >
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