### 环境搭建

#### 找回剩余容量

* 参考 https://blog.csdn.net/weixin_42252435/article/details/116632826?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_title~default-0.essearch_pc_relevant&spm=1001.2101.3001.4242.1

* 首先来查看一下系统的磁盘情况
```bash
orangepi@orangepi:~$ sudo fdisk -l

        Device Boot      Start         End      Blocks   Id  System
/dev/mmcblk0p1           40960      124927       41984   83  Linux
/dev/mmcblk0p2          124928     7167999     3521536   83  Linux
```

* 查看第二分区的起始地址，后面会用到

```bash
orangepi@orangepi:~$ cat /sys/block/mmcblk0/mmcblk0p2/start
124928
```

* 操作磁盘,并调整ext文件系统的空间大小

```bash
orangepi@orangepi:~$ sudo fdisk /dev/mmcblk0

Command (m for help): d
Partition number (1-4): 2

Command (m for help): n
Partition type:
   p   primary (1 primary, 0 extended, 3 free)
   e   extended
Select (default p): 
Using default response p
Partition number (1-4, default 2): 
Using default value 2
First sector (2048-62333951, default 2048): 124928
Last sector, +sectors or +size{K,M,G} (124928-62333951, default 62333951): 
Using default value 62333951

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.

orangepi@orangepi:~$ sudo reboot
orangepi@orangepi:~$ sudo resize2fs /dev/mmcblk0p2
```

#### 配置环境

* 配置

```bash 
sudo apt-get update
sudo apt-get install --reinstall systemd -y
sudo apt install cups-bsd -y
cp /usr/lib/cups/backend/gutenprint52+usb /usr/lib/cups/backend/gutenprint52usb
```

* 配置 .net core 3.1 环境

```bash
wget --no-check-certificate https://download.visualstudio.microsoft.com/download/pr/1b2a2fb1-b04b-485b-8a25-caed97ebe601/0c6024a3814f664558dc39fc85b34192/dotnet-sdk-3.1.416-linux-arm.tar.gz

sudo mkdir /usr/share/dotnet
sudo tar -xvf dotnet-sdk-3.1.416-linux-arm.tar.gz -C /usr/share/dotnet
sudo ln -s /usr/share/dotnet/dotnet /usr/bin/dotnet
root@orangepi:~# dotnet --info
.NET Core SDK (reflecting any global.json):
 Version:   3.1.416
 Commit:    8d3765c609
```

* 拷贝 gcm.zip 进入系统

```
bash install.sh
chmod +x /usr/local/gcm/bin/*
source /etc/profile.d/gcm.sh
```
* 拷贝软件, 软件设置为服务

```
vim /etc/systemd/system/printerclient.service
```
```
[Unit]
Description=Printer Client

[Service]
WorkingDirectory=/root/netcoreapp3.1/
ExecStart=/root/netcoreapp3.1/autorun.sh
Restart=always
RestartSec=10

[Install]
WantedBy=multi-user.target
```

```
vim netcoreapp3.1/autorun.sh
```

```
#!/bin/sh

export GCM_HOME=/usr/local/gcm
export PATH=$GCM_HOME/bin:$PATH
LD_LIBRARY_PATH=$GCM_HOME/lib:$LD_LIBRARY_PATH

export LD_LIBRARY_PATH

cd /root/netcoreapp3.1

dotnet PrinterClient.dll

```

* 将服务设置为每次开机启动
```
systemctl enable printerclient.service
```

* 服务立即启动，下次不启动
```
systemctl start printerclient.service
```