mind-the-uid-gid-good-sh

mind-the-uid-gid-good.sh

# BAD
# Reminder - My machine's UID:GID is 1000:1000

# root UID:GID is 0:0

$ docker run --rm -it -v $PWD/:/code/ --user=root --workdir=/code/ --entrypoint=bash unfor19/frigga

root@987c5784a52e:/code$ cat /etc/passwd | grep "$(whoami)"
root:x:0:0:root:/root:/bin/bash
# UID:GID = 0:0

root@987c5784a52e:/code$ echo "root contents" > root-file.txt
root@987c5784a52e:/code$ ls -lh root-file.txt
# -rw-r--r-- 1 root root 14 Feb 12 14:03 root-file.txt
root@987c5784a52e:/code$ exit

# Local machine
$ ls -lh root-file.txt 
# -rw-r--r-- 1 root root 14 Feb 12 14:04 root-file.txt

$ echo "more contents" >> root-file.txt
# bash: root-file.txt: Permission denied