I am calling logcat, but the log says LogTail() was called. Is this right?
What is /tmp/.photostructure-cache-1032/logs/**/*.log? The logs are being written to .photostructure/library/logs as per default. How come logcat tried to load that tmp/ stuff?
from the Dockerfile to the docker-entrypoint.sh because some docker container managers were exposing the ENV to the user, and I thought that would be equivalent.
Spoiler alert:
it isn’t. If you shell into the container, the docker-entrypoint.sh isn’t run:
So PhotoStructure thinks it’s on a normal server running Debian.
What is /tmp/.photostructure-cache-1032/logs/**/*.log?
It’s the default log directory on non-docker linux, if there isn’t a ~/.config dir.
I originally implemented one of the tests in this horrible set of heuristics, and finally threw up my hands and went with the explicit env approach, but I think checking /proc/1/comm for tini should should be simple enough and more reliable.
Until I get out a fix, be sure to run export PS_IS_DOCKER=1 after shelling into your PhotoStructure docker container, and things should work properly.
So… I didn’t release that day because I found other (several unrelated) issue(s), but here’s the final algorithm that is implemented in this upcoming build:
// NOTE TO THE FUTURE: we used to parse out the owner from /proc/1/cgroup but
// that is missing from UnRAID docker containers, and doesn't work for podman
// or other container managers.
// An alternative would be to see that `/proc/1/comm === "tini"`, but it'll be
// "sh" if someone starts the container with `docker run -it
// photostructure/server sh`. I could check for `/proc/1/comm !== "systemd"`,
// but that might not be valid for some random linux distribution.
// The Dockerfile (and Dockerfile-alpine) copy
// /etc/profile.d/photostructure-docker.sh into their respective Docker
// images, so this should be safe and sufficiently explicit.
// See
// https://stackoverflow.com/questions/20010199/
// for madness.
export const isDocker = lazy(
() =>
isLinux &&
(toBoolean(process.env[PS_IS_DOCKER]) ??
existsSync("/.running-in-container"))
)
So, in English, that means:
if the PS_IS_DOCKER environment variable is set to a boolean-esque value (like “true” or “false”), use that.
If not, use the presence of /.running-in-container to determine if we’re in a container. This is just an empty file dropped into the image by the Dockerfile.
Note that this filename doesn’t comply with any standard–because I couldn’t find one. If someone knows of an Actual Standard, I’m happy to switch to that, but I don’t want to use /.dockerenv (given that it’s Docker-specific, and they love to change stuff continuously).
