How to install buildah on ubuntu 20.04

readme.md

install-buildah-ubuntu-20.04.md

. /etc/os-release
sudo sh -c "echo 'deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_${VERSION_ID}/ /' > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list"
wget -nv https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable/xUbuntu_${VERSION_ID}/Release.key -O Release.key
sudo apt-key add - < Release.key
sudo apt-get update -qq
sudo apt-get -qq -y install buildah
``

Sorry, does not work...

I managed to get it working with the following. It seems the prerequisites are not clearly specified.

sudo apt-get -y update
sudo apt-get install -y wget
sudo apt-get -y install ca-certificates
sudo apt-get -y install gnupg2
sudo echo 'deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_20.04/ /' | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list
sudo wget -nv https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable/xUbuntu_20.04/Release.key -O /tmp/Release.key
sudo apt-key add - < /tmp/Release.key
sudo apt-get -y update -qq

Shorter, dynamic, working, copy-paste version:

. /etc/os-release && \
apt-get update && \
apt-get install -y ca-certificates curl gnupg2 && \
echo "deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_${VERSION_ID}/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list && \
curl -fsL "https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable/xUbuntu_${VERSION_ID}/Release.key" | apt-key add - && \
apt-get update && \
apt-get install -y buildah

Looks like buildah is no longer in this repository. podman is still there, though. Anyone know where we can still find buildah for 20.04?

buildah is included in the default package repositories for >= Ubuntu 20.10.

For Ubuntu 20.04, it looks like, we need to build buildah from source right now, since there is no pre-build binary. Building instructions are here.

@dogukancagatay were you able to get the build from source to work? I tried building from source as described, but I think there are some broken dependencies. You need golang-1.17 or higher to install the container-networking plugins, but to compile buildah, it calls out golang-1.13. After installing the plugins, I installed golang-1.13 and verified it's being used, but this command:
PATH=/usr/lib/go-1.13/bin:$PATH make runc all SECURITYTAGS="apparmor seccomp"
fails with the following error:

HEAD is now at 425e105d VERSION: release 1.0.0-rc8
ln -sf ../../opencontainers/runc/runc
GO111MODULE=on go build -mod=vendor -ldflags '-X main.GitCommit=4b8e5d4b -X main.buildInfo=1653166826 -X main.cniVersion=v1.1.0 ' -gcflags "" -o bin/buildah -tags "apparmor seccomp     " ./cmd/buildah
build github.com/containers/buildah/cmd/buildah: cannot load io/fs: open /home/work/buildah/src/github.com/containers/buildah/vendor/io/fs: no such file or directory

@chad-green I wasn't able to build with the instructions from the install.md provided in buildah repository as well (sorry for directing you to wrong instructions), but I managed to build buildah from source on Ubuntu 20.04 using the following commands.

I used golang 1.16 because It was complaining with 1.13.

export DEBIAN_FRONTEND=noninteractive

# Get dependencies
apt-get update
apt-get install -y \
    curl \
    build-essential \
    libbtrfs-dev \
    make \
    bats \
    git \
    libapparmor-dev \
    libdevmapper-dev \
    libglib2.0-dev \
    libgpgme11-dev \
    libseccomp-dev \
    libselinux1-dev

# Install goenv and golang
git clone https://github.com/syndbg/goenv.git ~/.goenv
echo 'export GOENV_ROOT="$HOME/.goenv"' >> ~/.bashrc
echo 'export PATH="$GOENV_ROOT/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(goenv init -)"' >> ~/.bashrc
source ~/.bashrc
goenv install 1.16.15
goenv global 1.16.15
source ~/.bashrc

# Clone buildah and build
git clone https://github.com/containers/buildah ${GOPATH}/src/github.com/containers/buildah
cd ${GOPATH}/src/github.com/containers/buildah
go get -d ./
export GO111MODULE=auto
make runc all SECURITYTAGS="apparmor seccomp"

@dogukancagatay Your instructions worked for me but only after a few adjustments. For instance, I was missing runc and uidmap (which wasn't necessary for installation but e.g. for buildah login, cf. this comment in the skopeo repo). I also installed them via apt. Maybe you could add them to the list of dependencies. Also your approach with goenv didn't work for me at first, so I simply installed go following the instructions here. I encountered an error in the make command which I fixed loosely following this article.
Except for the runc dependency I wouldn't suggest changing your instructions though, but maybe if someone encounters the same problems as me in the future these resources will help.

For anyone still stuck with this, this works. 😄 https://fabianlee.org/2022/08/02/buildah-installing-buildah-and-podman-on-ubuntu-20-04/

This works for me with Ubuntu 20.04 in Azure. I am using this to update the Azure DevOps agents because I am using buildah in the pipelines.
However, every now and then I get:

E: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process NNNN (apt-get)

On the install command, as it seems the update command leaves something in background and returns control before finishing... That is not very nice for unattended scripts.

For anyone still stuck with this, this works. 😄 https://fabianlee.org/2022/08/02/buildah-installing-buildah-and-podman-on-ubuntu-20-04/

Worked for me, thank you.

Also I'm pasting same instructions just in case something happens to the site hosting them

# prereq packages
sudo apt-get update

sudo apt-get install -y wget ca-certificates gnupg2

# add repo and signing key
VERSION_ID=$(lsb_release -r | cut -f2)

echo "deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_${VERSION_ID}/ /" | sudo tee /etc/apt/sources.list.d/devel-kubic-libcontainers-stable.list

curl -Ls https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable/xUbuntu_$VERSION_ID/Release.key | sudo apt-key add -

sudo apt-get update

# install buildah and podman
sudo apt install buildah podman -y

# fix known issue 11745 with [machine] entry
sudo sed -i 's/^\[machine\]$/#\[machine\]/' /usr/share/containers/containers.conf

@theJaxon thanks your answer works for me