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Viewing logs of Kubernetes pods using lnav

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# klg
Viewing logs of Kubernetes pods using [lnav](https://lnav.org/).
This is written in bash script.

### Why this?
- I am sick of copying long auto-generated pod name before pasting into `kubectl logs` command. K9s can help here.
- My eyes hurt when looking at the wall of log text in the terminal
- I want to filter/search the logs in a professional log viewer
- I want to play with shell script

# DEMO
![klg](https://user-images.githubusercontent.com/6322508/201508336-6f66f56d-c54e-4009-b3ed-0b9f385978ad.gif)

# DEPENDENCIES

This tool depends on `fzf`, `lnav` and `kubectl`. 
- Please make sure that you installed [lnav](https://lnav.org/) 
- Your `kubectl` must work
- Please install [fzf](https://github.com/junegunn/fzf) for fuzzy search

# HOW TO USE

## View pod logs with `klg`

View logs of your pod/container using `lnav`

Add this to your `.bashrc` or `.zshrc`
```
function klg () {
    <Path-to-your-cloned-repo>/klg/klg.sh $@
}
```

## Run shell command with `ksh`

Start `/bin/sh` inside your pod and let you run any shell command as you want.

Add this to your `.bashrc` or `.zshrc`
```
function ksh () {
    <Path-to-your-cloned-repo>/klg/ksh.sh $@
}
```

## Execute a shell command inside your pod with `ke`

Execute a shell command inside a k8s pod

Add this to your `.bashrc` or `.zshrc`
```
function ke () {
    <Path-to-your-cloned-repo>/klg/ke.sh $@
}
```

## Usage
```
klg [options]
ksh [options]
ke [options]
```

Available option:
- `-n`: Keyword to fuzzy search for k8s namespace. Ignored when `-N` is specified.
- `-p`: Keyword to fuzzy search for k8s pod. Ignored when `-P` is specified.
- `-c`: Keyword to fuzzy search for container. Ignored when `-C` is specified.
- `-N`: Exact namespace (no searching)
- `-P`: Exact pod name (no searching)
- `-C`: Exact container name (no searching)

If namespace options are not provided, `$K8S_DEFAULT_NS` will be used, by default, it is `default`.
If pod options are not provided, the user will be asked to select pod on a fuzzy search popup.
If container options are not provided for multi-container pods, the user will be asked to select container on a fuzzy search popup.

Example:
```
klg
klg -n my-nsp
klg -n my-namespace -p my-pod -c my-container
K8S_DEFAULT_NS=my-default-ns klg -p mypd -c myctn
ksh -p my-pod
ksh -n my-nsp -p my-pod -c my-container
ke -n my-nsp -p my-pod -- my-command the arg list

```

# GOALS
Finish following features:
- [x] Fuzzy search for k8s namespace/pod/container
- [x] Viewing logs in lnav
- [x] Using default namespace `default` or `$K8S_DEFAULT_NS`
- [x] Handle error cases and return error code (e.g. pod not found, namespace not found)
- [x] Auto-select the only container in pod

# ALTERNATIVE FOR FISH SHELL
If you are a *fisher* (as I am), please refer to [this file](https://github.com/haphamdev/dot-files/blob/master/fish/functions/klg.fish).

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