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idempotent installation

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Don't run the installer if Nix has already been installed on the host.
We assume that the installed Nix is already in the desired state.

This allows to share a given pipeline between hosted and self-hosted
runners. Usually the self-hosted runners are long-lived and already have
Nix installed.
This commit is contained in:
zimbatm 2020-11-02 12:35:39 +01:00
parent d5ba40b697
commit 334bb6100b
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5
lib/install-nix.sh
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@ -1,6 +1,11 @@
#!/usr/bin/env bash #!/usr/bin/env bash
set -euo pipefail set -euo pipefail
if type -p nix &>/dev/null ; then
echo "Aborting: Nix is already installed at $(type -p nix)"
exit
fi
# Configure Nix # Configure Nix
add_config() { add_config() {
echo "$1" | sudo tee -a /tmp/nix.conf >/dev/null echo "$1" | sudo tee -a /tmp/nix.conf >/dev/null