Fix rootless podman prometheus exporter

- Exporter runs as nobody, the rootless podman socket belongs to svc and only svc can use it
- The podman library inside the exporter decides its rootless by looking for per-user config in $HOME/.config
- $HOME inside the image is /home and /home/.config doesn't exist and the library treats a missing config directory as fatal error
- The config directory being mounted has to belong to the user reading it

Ironically, the directory stays empty and nothing ever reads from it. The mount gets the exporter past a startup check that assumes its running on a normal host, not in a minimal busybox container.

1 files changed, 1 insertions, 0 deletions

diff --git a/meta-unit-virtualization/recipes-containers/prometheus-podman-exporter-rootless/files/prometheus-podman-exporter.container b/meta-unit-virtualization/recipes-containers/prometheus-podman-exporter-rootless/files/prometheus-podman-exporter.container
index 0cdfb0b..bc94095 100644
--- a/meta-unit-virtualization/recipes-containers/prometheus-podman-exporter-rootless/files/prometheus-podman-exporter.container
+++ b/meta-unit-virtualization/recipes-containers/prometheus-podman-exporter-rootless/files/prometheus-podman-exporter.container
@@ -11,6 +11,7 @@ Volume=%t/podman/podman.sock:/run/podman/podman.sock:ro
 Environment=CONTAINER_HOST=unix:///run/podman/podman.sock
 PodmanArgs=--userns=keep-id:uid=65534
 Exec=--collector.enable-all
+Mount=type=tmpfs,destination=/home/.config,tmpfs-mode=0700,chown
 
 [Service]
 Restart=on-failure