Quadlet container's entrypoint

[homelan-git]

Hi,

I've some problems to override the Entrypoint= . I'm using a MariaDB official image (rootless Podman) and want to make a backup from them. One container has a running DB for Gitea. I want to dump this using a timer.
For this a have a target, timer and another MariaDB image for the 'dump' container.

• gitea-db-dump.target:

[Unit]
Description=Gitea MariaDB dump target

• gitea-db-dump.timer

[Unit]
Description=Dump Gitea's DB periodically for backup purposes
[Timer]
OnCalendar=*:0/1 # for test only
Persistent=true
Unit=gitea-db-dump.target
[Install]
WantedBy=gitea-db-dump.target

• and finally gitea-db-dump.container

[Unit]
Description=Dump Gitea's MariaDB database to a file
Requires=gitea-db.service
After=gitea-db.service
Wants=gitea-db-dump.timer

[Container]
Image=docker.io/mariadb:12
AutoUpdate=registry
ContainerName=gitea-db-dump

Environment=MYSQL_DATABASE=gitea
Environment=MYSQL_USER=gitea

Secret=gitea-mysql-password,type=env,target=MYSQL_PASSWORD

Volume=%h/backup/gitea:/backup:rw

Pod=gitea.pod

Entrypoint=/bin/sh -c '/usr/bin/mariadb-dump --host=127.0.0.1 --user=${MYSQL_USER} --password=${MYSQL_PASSWORD} --single-transaction --extended-insert --comments --dump-date --all-databases > /backup/gitea/db-backup.sql'

[Service]
Type=oneshot
ExecStartPre=mkdir -p %h/backup/gitea

[Install]
WantedBy=gitea-db-dump.target

and get the error

Oct 06 18:55:36 coreos-test gitea-db-dump[1788]: Error: crun: executable file `/bin/sh -c '/usr/bin/mariadb-dump --host=127.0.0.1 --user= --password= --single-transaction --extended-insert --comments --dump-date --all-databases > /backup/gitea/db--backup.sql'` not found: No such file or directory: OCI runtime attempted to invoke a command that was not found

How to cope with it? I don't like to write a shell script, even I have to pass ENV vars and I'm expecting the same problem there.

I'm using CoreOS stable with systemd 257 (257.9-2.fc42).

[eriksjolund]

Does it work if you replace

Entrypoint=/bin/sh -c '/usr/bin/mariadb-dump --host=127.0.0.1 --user=${MYSQL_USER} --password=${MYSQL_PASSWORD} --single-transaction --extended-insert --comments --dump-date --all-databases > /backup/gitea/db-backup.sql'

with

Exec= -c '/usr/bin/mariadb-dump --host=127.0.0.1 --user=$MYSQL_USER --password=$MYSQL_PASSWORD --single-transaction --extended-insert --comments --dump-date --all-databases > /backup/gitea/db-backup.sql'
Entrypoint=/bin/sh

Note, the curly brackets were also removed.

Here is a minimal test

1. echo -n mysecret > ~/secret.txt
2. podman secret create gitea-mysql-password ~/secret.txt
3. Create file ~/.config/containers/systemd/test.container containing

   [Service]
   Type=oneshot
   [Container]
   ContainerName=test
   Environment=MYSQL_DATABASE=gitea
   Environment=MYSQL_USER=gitea
   Secret=gitea-mysql-password,type=env,target=MYSQL_PASSWORD
   Image=docker.io/mariadb:12
   Exec= -c 'echo MYSQL_USER=${MYSQL_USER} MYSQL_USER=$MYSQL_USER MYSQL_PASSWORD=$MYSQL_PASSWORD'
   Entrypoint=/bin/sh
   

4. systemctl --user daemon-reload
5. systemctl --user start test.service
6. journalctl --user -xeu test.service | grep test | grep MYSQL_PASSWORD
   The following output is printed

   Oct 07 07:13:26 localhost.localdomain test[10957]: MYSQL_USER= MYSQL_USER=gitea MYSQL_PASSWORD=mysecret
   

[homelan-git]

After some time, it seems to work - even with the ENV vars. Thanks you!