python - 如何在一行中转换shell脚本并从Python子进程中执行它？

Question

我有下面的简单 shell 脚本，我试图将其转换为一行，以便我可以使用子进程从我的 Python 程序中执行它 -

#!/bin/bash
set -e

COUNT=60   #number of 10 second timeouts in 10 minutes
SUM_SYNCS=0
SUM_SYNCS_BEHIND=0
HOSTNAME=$hostname

echo $HOSTNAME

while [[ $COUNT -ge "0" ]]; do

#send the request, put response in variable
DATA=$(wget -O - -q -t 1 http://$HOSTNAME:8080/beat)

#grep $DATA for syncs and syncs_behind
SYNCS=$(echo $DATA | grep -oE 'num_syncs: [0-9]+' | awk '{print $2}')
SYNCS_BEHIND=$(echo $DATA | grep -oE 'num_syncs_behind: [0-9]+' | awk '{print $2}')

echo $SYNCS
echo $SYNCS_BEHIND

#verify conditionals
if [[ $SYNCS -gt "8" && $SYNCS_BEHIND -eq "0" ]]; then exit 0; fi

#decrement the counter
let COUNT-=1

#wait another 10 seconds
sleep 10

done

我将上面的脚本转换为一行，如下所示 -

jsonStr = {"script": "#!/bin/bash\nset -e\n\nCOUNT=60   #number of 10 second timeouts in 10 minutes\nSUM_SYNCS=0\nSUM_SYNCS_BEHIND=0\nHOSTNAME=$hostname\t\n\necho $HOSTNAME\n\nwhile [[ $COUNT -ge \"0\" ]]; do\n\n#send the request, put response in variable\nDATA=$(wget -O - -q -t 1 http://$HOSTNAME:8080/beat)\n\n#grep $DATA for syncs and syncs_behind\nSYNCS=$(echo $DATA | grep -oE 'num_syncs: [0-9]+' | awk '{print $2}')\nSYNCS_BEHIND=$(echo $DATA | grep -oE 'num_syncs_behind: [0-9]+' | awk '{print $2}')\n\necho $SYNCS\necho $SYNCS_BEHIND\n\n#verify conditionals\nif [[ $SYNCS -gt \"8\" && $SYNCS_BEHIND -eq \"0\" ]]; then exit 0; fi\n\n#decrement the counter\nlet COUNT-=1\n\n#wait another 10 seconds\nsleep 10\n\ndone\n"}

我尝试使用 Python 子进程执行此操作，但每次我都会收到错误 -

  File "C:\Python27\lib\json\__init__.py", line 326, in loads
    return _default_decoder.decode(s)
  File "C:\Python27\lib\json\decoder.py", line 366, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
TypeError: expected string or buffer

下面是我正在尝试的完整 Python 代码 -

jsonStr = {"script": "#!/bin/bash\nset -e\n\nCOUNT=60   #number of 10 second timeouts in 10 minutes\nSUM_SYNCS=0\nSUM_SYNCS_BEHIND=0\nHOSTNAME=$hostname\t#\n\necho $HOSTNAME\n\nwhile [[ $COUNT -ge \"0\" ]]; do\n\n#send the request, put response in variable\nDATA=$(wget -O - -q -t 1 http://$HOSTNAME:8080/beat)\n\n#grep $DATA for syncs and syncs_behind\nSYNCS=$(echo $DATA | grep -oE 'num_syncs: [0-9]+' | awk '{print $2}')\nSYNCS_BEHIND=$(echo $DATA | grep -oE 'num_syncs_behind: [0-9]+' | awk '{print $2}')\n\necho $SYNCS\necho $SYNCS_BEHIND\n\n#verify conditionals\nif [[ $SYNCS -gt \"8\" && $SYNCS_BEHIND -eq \"0\" ]]; then exit 0; fi\n\n#decrement the counter\nlet COUNT-=1\n\n#wait another 10 seconds\nsleep 10\n\ndone\n"}

j = json.loads(jsonStr)

print "start"
proc = subprocess.Popen(j['script'], shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, executable='/bin/bash')
(stdout, stderr) = proc.communicate()
print stdout
print stderr
print "end" 

我在一行中转换的 shell 脚本有什么问题？有什么想法吗？

注意:我的所有其他 shell 脚本都在工作，它们也在同一个 Python 子进程调用的一个衬里中，只是这个有一些问题。

Answer 1

您收到的错误来自json.loads(jsonStr)。 json.loads 需要 str 或 unicode 而不是 dict。 jsonStr 已经是一个 dict 你不需要 json.loads