Environment variables with equals signs are truncated in SSH sessions
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andrew-drupal commented
The awk script that produces /home/wodby/.ssh/environment
breaks lines into parts by equals signs, but does not take third and subsequent parts when printing the output.
That results in all variable contents after first equals sign being lost in SSH sessions. In local shell sessions, the variables are left as defined in environment
/ env_file
.
Environment
Ubuntu 22.04.4
Docker version 26.0.0, build 2ae903e
wodby/php:8.2-dev-4.48.0
Steps to reproduce
- Create minimal
compose.yml
:
services:
sshd:
image: wodby/php:8.2-dev-4.48.0
environment:
- "DATABASE_URL=postgresql://user:password@host:5432/mydb?serverVersion=16&charset=utf8"
command: ["sudo", "/usr/sbin/sshd", "-De"]
ports:
- "2220:22"
volumes:
- ./authorized_keys:/home/wodby/.ssh/authorized_keys
- Copy contents of your
id_rsa.pub
toauthorized_keys
in same folder ascompose.yml
and set permissions to 600.
cp ~/.ssh/id_rsa.pub authorized_keys
chmod 600 authorized_keys
- Run the container and connect to
sshd
container via SSH and print theDATABASE_URL
variable.
docker compose up -d
ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -p 2220 -i ~/.ssh/id_rsa wodby@127.0.0.1
echo $DATABASE_URL
Expected output
postgresql://user:password@host:5432/mydb?serverVersion=16&charset=utf8
Actual output
postgresql://user:password@host:5432/mydb?serverVersion
Notes
When executing Bash inside container, the variable is output as defined in compose.yml
:
docker compose exec sshd /bin/bash
echo $DATABASE_URL
# postgresql://user:password@host:5432/mydb?serverVersion=16&charset=utf8
Also content of /home/wodby/.ssh/environment
:
grep DATABASE_URL /home/wodby/.ssh/environment
# DATABASE_URL=postgresql://user:password@host:5432/mydb?serverVersion