# **AppName<span></span>.sh Scripts**

 `AppName.sh` scripts found in the `/ct` directory. These scripts are responsible for the installation of the desired application. For this guide we take `/ct/snipeit.sh` as example.

## Table of Contents

- [**AppName.sh Scripts**](#appnamesh-scripts)
  - [Table of Contents](#table-of-contents)
  - [1. **File Header**](#1-file-header)
    - [1.1 **Shebang**](#11-shebang)
    - [1.2 **Import Functions**](#12-import-functions)
    - [1.3 **Metadata**](#13-metadata)
  - [2 **Variables and function import**](#2-variables-and-function-import)
    - [2.1 **Default Values**](#21-default-values)
  - [2.2 **📋 App output \& base settings**](#22--app-output--base-settings)
  - [2.3 **🛠 Core functions**](#23--core-functions)
  - [3 **Update function**](#3-update-function)
    - [3.1 **Function Header**](#31-function-header)
    - [3.2 **Check APP**](#32-check-app)
    - [3.3 **Check version**](#33-check-version)
    - [3.4 **Verbosity**](#34-verbosity)
    - [3.5 **Backups**](#35-backups)
    - [3.6 **Cleanup**](#36-cleanup)
    - [3.7 **No update function**](#37-no-update-function)
  - [4 **End of the script**](#4-end-of-the-script)
  - [5. **Contribution checklist**](#5-contribution-checklist)

## 1. **File Header**

### 1.1 **Shebang**

- Use `#!/usr/bin/env bash` as the shebang.

```bash
#!/usr/bin/env bash
```

### 1.2 **Import Functions**

- Import the build.func file.
- When developing your own script, change the URL to your own repository.

> [!IMPORTANT] 
> You also need to change all apperances of this URL in `misc/build.func` and `misc/install.func`

Example for development:

```bash
source <(curl -s https://raw.githubusercontent.com/[USER]/[REPO]/refs/heads/[BRANCH]/misc/build.func)
```

Final script:

```bash
source <(curl -s https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/misc/build.func)
```

> [!CAUTION]
> Before opening a Pull Request, change the URLs to point to the community-scripts repo.

### 1.3 **Metadata**

- Add clear comments for script metadata, including author, copyright, and license information.

Example:

```bash
# Copyright (c) 2021-2025 community-scripts ORG
# Author: [YourUserName]
# License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
# Source: [SOURCE_URL]
```

> [!NOTE]:
>
> - Add your username and source URL
> - For existing scripts, add "| Co-Author [YourUserName]" after the current author

---

## 2 **Variables and function import**
>
> [!NOTE]
> You need to have all this set in your script, otherwise it will not work!

### 2.1 **Default Values**

- This section sets the default values for the container.
- `APP` needs to be set to the application name and must be equal to the filenames of your scripts.
- `var_tags`: You can set Tags for the CT wich show up in the Proxmox UI. Don´t overdo it!

>[!NOTE]
>Description for all Default Values
>
>| Variable | Description | Notes |
>|----------|-------------|-------|
>| `APP` | Application name | Must match ct\AppName.sh |
>| `var_tags` | Proxmox display tags without Spaces, only ; | Limit the number |  
>| `var_cpu` | CPU cores | Number of cores |
>| `var_ram` | RAM | In MB |
>| `var_disk` | Disk capacity | In GB |
>| `var_os` | Operating system | alpine, debian, ubuntu |
>| `var_version` | OS version | e.g., 3.20, 11, 12, 20.04 |
>| `var_unprivileged` | Container type | 1 = Unprivileged, 0 = Privileged |

Example:

```bash
APP="SnipeIT"
var_tags="asset-management;foss"
var_cpu="2"
var_ram="2048"
var_disk="4"
var_os="debian"
var_version="12"
var_unprivileged="1"
```

## 2.2 **📋 App output & base settings**

```bash
header_info "$APP"
```
- `header_info`: Generates ASCII header for APP

## 2.3 **🛠 Core functions**

```bash
variables
color
catch_errors
```

- `variables`: Processes input and prepares variables
- `color`: Sets icons, colors, and formatting
- `catch_errors`: Enables error handling

---

## 3 **Update function**

### 3.1 **Function Header**

- If applicable write a function that updates the application and the OS in the container.
- Each update function starts with the same code:

```bash
function update_script() {
  header_info
  check_container_storage
  check_container_resources
```

### 3.2 **Check APP**

- Before doing anything update-wise, check if the app is installed in the container.

Example:

```bash
if [[ ! -d /opt/snipe-it ]]; then
    msg_error "No ${APP} Installation Found!"
    exit
  fi
```

### 3.3 **Check version**

- Before updating, check if a new version exists.
  - We use the `${APPLICATION}_version.txt` file created in `/opt` during the install to compare new versions against the currently installed version.

Example with a Github Release:

```bash
 RELEASE=$(curl -fsSL https://api.github.com/repos/snipe/snipe-it/releases/latest | grep "tag_name" | awk '{print substr($2, 3, length($2)-4) }')
  if [[ ! -f /opt/${APP}_version.txt ]] || [[ "${RELEASE}" != "$(cat /opt/${APP}_version.txt)" ]]; then
    msg_info "Updating ${APP} to v${RELEASE}"
    #DO UPDATE
  else
    msg_ok "No update required. ${APP} is already at v${RELEASE}."
  fi
  exit
}
```

### 3.4 **Verbosity**

- Use the appropriate flag (**-q** in the examples) for a command to suppress its output.
Example:

```bash
wget -q
unzip -q
```

- If a command does not come with this functionality use `$STD` to suppress it's output.

Example:

```bash
$STD php artisan migrate --force 
$STD php artisan config:clear 
```

### 3.5 **Backups**

- Backup user data if necessary.
- Move all user data back in the directory when the update is finished.

>[!NOTE]
>This is not meant to be a permanent backup

Example backup:

```bash
  mv /opt/snipe-it /opt/snipe-it-backup
```

Example config restore:

```bash
  cp /opt/snipe-it-backup/.env /opt/snipe-it/.env
  cp -r /opt/snipe-it-backup/public/uploads/ /opt/snipe-it/public/uploads/
  cp -r /opt/snipe-it-backup/storage/private_uploads /opt/snipe-it/storage/private_uploads
```

### 3.6 **Cleanup**

- Do not forget to remove any temporary files/folders such as zip-files or temporary backups.
Example:

```bash
  rm -rf /opt/v${RELEASE}.zip
  rm -rf /opt/snipe-it-backup
```

### 3.7 **No update function**

- In case you can not provide an update function use the following code to provide user feedback.

```bash
function update_script() {
    header_info
    check_container_storage
    check_container_resources
    if [[ ! -d /opt/snipeit ]]; then
        msg_error "No ${APP} Installation Found!"
        exit
    fi
    msg_error "Currently we don't provide an update function for this ${APP}."
    exit
}
```

---

## 4 **End of the script**

- `start`: Launches Whiptail dialogue
- `build_container`: Collects and integrates user settings
- `description`: Sets LXC container description
- With `echo -e "${TAB}${GATEWAY}${BGN}http://${IP}${CL}"` you can point the user to the IP:PORT/folder needed to access the app.

```bash
start
build_container
description

msg_ok "Completed Successfully!\n"
echo -e "${CREATING}${GN}${APP} setup has been successfully initialized!${CL}"
echo -e "${INFO}${YW} Access it using the following URL:${CL}"
echo -e "${TAB}${GATEWAY}${BGN}http://${IP}${CL}"
```

---

## 5. **Contribution checklist**

- [ ] Shebang is correctly set (`#!/usr/bin/env bash`).
- [ ] Correct link to *build.func*
- [ ] Metadata (author, license) is included at the top.
- [ ] Variables follow naming conventions.
- [ ] Update function exists.
- [ ] Update functions checks if app is installed and for new version.
- [ ] Update function cleans up temporary files.
- [ ] Script ends with a helpful message for the user to reach the application.
