CODEWITHSUNDEEP
linuxshellcloudrust-cargo
Kai Walter
Kai Walter

Reputation: 4041

How can I run shell commands for non-root user during cloud-init configuration?

During installation of a cloud VM with cloud-init e.g. when installing Rust toolchain

#cloud-config
package_upgrade: true
packages:
- apt-transport-https
- build-essential
- cmake
runcmd:
- export RUSTUP_HOME=/opt/rust
- export CARGO_HOME=/opt/rust
- curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | bash -s -- -y --no-modify-path --default-toolchain stable --profile default

I also want to execute the toolchain configuration rustup default stable in user space so that it is ready to use when user first signs in.

Upvotes: 0

Views: 1018

Answers (1)

Kai Walter
Kai Walter

Reputation: 4041

One key element is to determine the (target/adminsitration) user, that is currently installed on the VM with export USER=$(awk -v uid=1000 -F":" '{ if($3==uid){print $1} }' /etc/passwd), so that environment variable $USER holds the username during the cloud-init configuration process. Then to use sudo -H -u $USER to run a shell in target user's context. Also import is to enhance the user's environment to include the installed toolchain - permanently with extending .profile or alike as well as temporarily while executing this shell operation.

#cloud-config
package_upgrade: true
packages:
- apt-transport-https
- build-essential
- cmake
runcmd:
- export USER=$(awk -v uid=1000 -F":" '{ if($3==uid){print $1} }' /etc/passwd)
- export RUSTUP_HOME=/opt/rust
- export CARGO_HOME=/opt/rust
- curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | bash -s -- -y --no-modify-path --default-toolchain stable --profile default
- echo '\n\n# added by cloud init\nsource /opt/rust/env' >> /home/$USER/.profile
- sudo -H -u $USER bash -c 'source /opt/rust/env && rustup default stable'

check out complete post with background information

Upvotes: 2

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