Add one-off command #65
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This command takes the image of the container of the current pod and runs the specified command in a one-off kubectl run command. If the pod has multiple containers and none is specified, it will fail asking for the specific container.
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I might have done some things wrong, so I'm really happy to receive feedback on this! |
src/cmd.rs
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| .arg("--context") | ||
| .arg(&kluster.name) | ||
| .arg("run") | ||
| .arg("one-off-shell") |
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Could be named more specific eg. <pod_name>-one-off
src/cmd.rs
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| @@ -1145,6 +1145,199 @@ command!( | |||
| } | |||
| ); | |||
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| command!( | |||
| OneOff, | |||
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OneOff should be probably Run to mimic the kubectl command.
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Would be useful to have the env variables of the specified pod set as well. |
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The challenge with the env variables is, that there might be some variables from secrets and |
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This looks great! I'm just gonna test it out and then will leave comments and/or merge |
src/cmd.rs
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| clickwrite!(writer, "Couldon't get container image\n"); | ||
| return; | ||
| }; | ||
| let pod_name = format!("one-off-shell-{}", container_image.as_str()); |
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this needs to truncate to 63 characters, and also needs to replace any invalid or uppercase characters. from k8s: must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')
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From k8s: ``` must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*' ```
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@nicklan thanks for pointing that out. I added a method to sanitise the pod name. |
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I realised that the current implementation only allows one run command of the same image at the same time. A random sequence could be added to the K8s name so it does not fail for more run commands for the same pod/image at the same time. |
| let pod_name_regex = Regex::new(r"[^a-z0-9-]").unwrap(); | ||
| let result = pod_name_regex.replace_all(&s.to_ascii_lowercase().to_string(), "-").to_string(); | ||
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| if &result[0..1] == "-" || &result[58..59] == "-" { |
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You can't hard-code up to 59 here since the pod name might be less than 59 characters which will cause a panic. You'll need to look at the string length and go off that.
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Oh no that's not good. I also realized that you can't run a command for the same pod twice. So while fixing this I would also introduce a random string to accommodate that use case.
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Yeah, that's true. The other option is that you can delete the pod when it's done. Maybe the right thing to do would be to default to adding a random string, but have an option like --name that lets you set the name you want to use
This command takes the image of the container of the current pod
and runs the specified command in a one-off kubectl run command.
If the pod has multiple containers and none is specified, it will
fail asking for the specific container.