Why the HOME of root change sometimes?

[DinoStray]

Sometimes the HOME of root is /root
And Somtimes it is /
Why the HOME enviroment change sometimes?

[PikachuEXE]

How to reproduce?

[DinoStray]

File: Dockerfile

FROM phusion/baseimage:0.10.1
LABEL maintainer="yulin.li@blockin.com"

# Use baseimage-docker's init system.
CMD ["/sbin/my_init"]

ENV HOME /root
ENV TERM xterm

RUN echo $HOME

RUN mkdir -p /etc/service/xcoind
ADD run.sh /etc/service/xcoind/run
RUN chmod +x /etc/service/xcoind/run

File: run.sh

#!/usr/bin/env bash

echo $HOME

In Dockerfile
RUN echo $HOME
echo /root

but in run.sh
echo $HOME
echo nothing

some cmds:
docker build -t test --no-cache .
docker run --name tt -d test
docker logs --tail 50 --follow --timestamps tt

and if login docker
docker exec -it tt bash
then run
echo $HOME
show:
/root

@PikachuEXE

[PikachuEXE]

See #119 (comment)