Question

我正在尝试使用bash脚本从服务器收集基本磁盘空间信息，并以JSON格式存储输出。我期待记录可用的＆amp;用过的磁盘空间。

df -h的示例输出：

Filesystem                      Size  Used Avail Use% Mounted on
udev                            2.0G  4.0K  2.0G   1% /dev
tmpfs                           394M  288K  394M   1% /run
/dev/mapper/nodequery--vg-root   45G  1.4G   41G   4% /
none                            4.0K     0  4.0K   0% /sys/fs/cgroup
none                            5.0M     0  5.0M   0% /run/lock
none                            2.0G     0  2.0G   0% /run/shm
none                            100M     0  100M   0% /run/user
/dev/sda2                       237M   47M  178M  21% /boot
/dev/sda1                       511M  3.4M  508M   1% /boot/efi

作为一个例子，我希望看到最终输出。

{
  "diskarray": [{
    "mount": "/dev/disk1",
    "spacetotal": "35GB",
    "spaceavail": "1GB"
  },
  {
    "mount": "/dev/disk2",
    "spacetotal": "35GB",
    "spaceavail": "4GB"
  }]
}

到目前为止，我尝试过使用awk：

df -P -B 1 | grep '^/' | awk '{ print $1" "$2" "$3";" }'

使用以下输出：

/dev/mapper/nodequery--vg-root 47710605312 1439592448;
/dev/sda2 247772160 48645120;
/dev/sda1 535805952 3538944;

但我不确定如何获取该数据并将其存储为JSON格式。

Answer 1

以下是您想要的，bash外部唯一的要求是Python解释器：

python_script=$(cat <<'EOF'
import sys, json

data = {'diskarray': []}
for line in sys.stdin.readlines():
    mount, avail, total = line.rstrip(';').split()
    data['diskarray'].append(dict(mount=mount, spacetotal=total, spaceavail=avail))
sys.stdout.write(json.dumps(data))
EOF
)

df -Ph | awk '/^\// { print $1" "$2" "$3";" }' | python -c "$python_script"

使用jq的替代实现可能如下所示：

df -Ph | \
  jq -R -s '
    [
      split("\n") |
      .[] |
      if test("^/") then
        gsub(" +"; " ") | split(" ") | {mount: .[0], spacetotal: .[1], spaceavail: .[2]}
      else
        empty
      end
    ]'

Answer 2

你可以这样做：

$ df -Ph | awk '/^\// {print $1"\t"$2"\t"$4}' | python -c 'import json, fileinput; print json.dumps({"diskarray":[dict(zip(("mount", "spacetotal", "spaceavail"), l.split())) for l in fileinput.input()]}, indent=2)'
{
  "diskarray": [
    {
      "mount": "/dev/disk1", 
      "spacetotal": "931Gi", 
      "spaceavail": "623Gi"
    }, 
    {
      "mount": "/dev/disk2s2", 
      "spacetotal": "1.8Ti", 
      "spaceavail": "360Gi"
    }
  ]
}

Answer 3

替代Oneliner

$ df -hP | awk 'BEGIN {printf"{\"discarray\":["}{if($1=="Filesystem")next;if(a)printf",";printf"{\"mount\":\""$6"\",\"size\":\""$2"\",\"used\":\""$3"\",\"avail\":\""$4"\",\"use%\":\""$5"\"}";a++;}END{print"]}";}'

{
   "discarray":[
      {
         "mount":"/",
         "size":"3.9G",
         "used":"2.2G",
         "avail":"1.5G",
         "use%":"56%"
      },
      {
         "mount":"/dev",
         "size":"24G",
         "used":"0",
         "avail":"24G",
         "use%":"0%"
      }
   ]
}

Answer 4

Xidel和一些XQuery魔术可以完成您想要的操作（我使用了df -h的输出）。

df -h | xidel -s - --xquery '
  {
    "diskarray":[
      for $x in x:lines($raw)[starts-with(.,"/")]
      let $a:=tokenize($x,"\s+")
      return {
        "mount":$a[1],
        "spacetotal":$a[2],
        "spaceavail":$a[4]
      }
    ]
  }
'
{
  "diskarray": [
    {
      "mount": "/dev/mapper/nodequery--vg-root",
      "spacetotal": "45G",
      "spaceavail": "41G"
    },
    {
      "mount": "/dev/sda2",
      "spacetotal": "237M",
      "spaceavail": "178M"
    },
    {
      "mount": "/dev/sda1",
      "spacetotal": "511M",
      "spaceavail": "508M"
    }
  ]
}

存储输出磁盘空间df -h JSON

4 个答案: