wait for the nix daemon

README.md

@@ -45,7 +45,19 @@ docker run --rm -it dxflrs/albatros:xxx
 
 where `xxx` is the commit sha you want.
 
-## Builders
+## Bring Your Own Builder
+
+One aspect that I don't like with traditional CI is that the way you can
+configure builds is very constrained by the vendor implementation choices.
+Like it or not, but Albatros has very few constraints in term of what build infrastructure should look like:
+  - It must be a Nomad parameterized job
+  - Your job must accept four mandatory meta parameters:  `REPO_URL`, `COMMIT`, `BRANCH`, `FLAVOR`
+  - Your job may receive a payload containing the secrets stored in your job definition (subject to change) 
+  - It must have have a task group named `runner` and, inside this group, a task named `executor`
+
+And... that's basically all you need.
+
+### A NixOS builder with local cache
 
 Currently, we propose a single, nix-based builder.
 I am currently working on using proper caching on it.

hcl/builder.hcl

@@ -86,6 +86,7 @@ fi
 #!/usr/bin/env bash
 set -euxo pipefail
 
+# setup workspace
 mkdir /workspace
 cd /workspace
 git init 
@@ -95,6 +96,11 @@ git checkout ${NOMAD_META_COMMIT} -b ${NOMAD_META_BRANCH}
 if [[ -s /var/run/secrets/albatros/secret.txt ]]; then
   export SECRET_PATH=/var/run/secrets/albatros/secret.txt
 fi
+
+# wait for nix daemon during 120 seconds
+timeout -s 9 120 bash -c 'until nix store ping; do sleep 2; done'
+
+# launch user's build
 ./.albatros
 
       EOH