如何在Jenkinsfile中获取Shell脚本的输出? [英] How to get the output of a shell script in a Jenkinsfile?
问题描述
在Jenkinsfile Groovy脚本阶段,说我想发出一个Linux命令,该命令输出字符串的行和列,并希望在特定行的输出中获得第n列.这样的命令的一个示例是"ls -al".所以我做对了吗?
In a Jenkinsfile Groovy script stage, say I want to issue a linux command that outputs rows and columns of strings, and want to get the nth column in the output of a certain row. An example of such command is "ls -al." So I do this correct?
stage("Get dir size") {
sh returnStatus: true, script: '''
LINE=`ls -al | grep some_dir`
IFS=" " read -ra COLS <<< $LINE
echo ${COLS[4]}
'''
/* I want to use the value of ${COL[4]} after above block */
}
但是如何获取本质上为$ {COL [4]}的值,该值是"ls -al"命令的第五列,即目录大小?
But how do I get the value of essentially ${COL[4]}, which is the fifth column in an "ls -al" command, which is the directory size?
谢谢!
推荐答案
在示例中显示的此bash脚本不会返回正确的目录大小.它将以递归方式返回文件的大小(通常为4096
字节),而不是所有文件和子目录的总大小.如果要获取目录的总大小,可以尝试执行以下操作:
This bash script you have shown in your example won't return correct directory size. It will return a size of a file, usually 4096
bytes and not a total size of all files and subdirectories recursively. If you want to get the total directory size you can try something like this:
#!groovy
node('master') {
stage("Get dir size") {
script {
DIR_SIZE = sh(returnStdout: true, script: 'du -sb /var/jenkins_home/war/jsbundles | cut -f1')
}
echo "dir size = ${DIR_SIZE}"
}
}
关键部分是在启用returnStdout
的情况下使用sh
步骤,以便您可以在变量内捕获脚本将输出到控制台的内容.在此示例中,我计算了/var/jenkins_home/war/jsbundles
文件夹的总大小,并且在运行此管道脚本时得到:
Crucial part is to use sh
step with returnStdout
enabled so you can capture inside a variable what the script prints out to the console. In this example I am calculating a total size of /var/jenkins_home/war/jsbundles
folder and when I run this pipeline script I get:
dir size = 653136
然后,您可以在以后的流水线步骤中将DIR_SIZE
变量用作输入.
You can then use DIR_SIZE
variable as an input in later pipeline steps.
您可以考虑使用Groovy的内置方法File.directorySize()
,而不是使用bash脚本,例如:
Instead of using a bash script you could consider using Groovy's built-in method File.directorySize()
, something like:
#!groovy
node('master') {
stage("Get dir size") {
script {
DIR_SIZE = new File('/var/jenkins_home/war/jsbundles').directorySize()
}
echo "dir size = ${DIR_SIZE}"
}
}
但是,与使用bash命令的用例相比,这种方法将为您提供不同的结果:
However, this approach will give you a different result comparing to the use case with bash command:
dir size = 649040
这是因为Groovy的File.directorySize()
方法以递归方式计算所有文件大小之和的结果,并且没有考虑目录文件的大小.在此示例中,差异为4096
-目录文件/var/jenkins_home/war/jsbundles
的大小(此路径不包含任何子文件夹,仅包含文件堆).
This is because Groovy's File.directorySize()
method calculates the result as a sum of all file sizes recursively and it does not take into account size of directory file. In this example the difference is 4096
- a size of a directory file /var/jenkins_home/war/jsbundles
(this path does not contain any subfolders, only bunch of files).
您可以通过将grep
和cut
之类的管道命令组合在一起,从类似列的输出中提取任何信息.例如,您可以将以上示例替换为:
You can extract any information from column-like output by piping commands like grep
and cut
together. For example, you can replace above examples with:
#!groovy
node('master') {
stage("Get dir size") {
script {
DIR_SIZE = sh(returnStdout: true, script: 'ls -la /var | grep jenkins_home | cut -d " " -f5')
}
echo "dir size = ${DIR_SIZE}"
}
}
对于以下输出:
total 60
drwxr-xr-x 1 root root 4096 Nov 4 2017 .
drwxr-xr-x 1 root root 4096 May 31 03:27 ..
drwxr-xr-x 1 root root 4096 Nov 4 2017 cache
dr-xr-xr-x 2 root root 4096 May 9 2017 empty
drwxr-xr-x 2 root root 4096 Nov 4 2017 git
drwxrwxr-x 20 jenkins jenkins 4096 May 31 12:26 jenkins_home
drwxr-xr-x 5 root root 4096 May 9 2017 lib
drwxr-xr-x 2 root root 4096 May 9 2017 local
drwxr-xr-x 3 root root 4096 May 9 2017 lock
drwxr-xr-x 2 root root 4096 May 9 2017 log
drwxr-xr-x 2 root root 4096 May 9 2017 opt
drwxr-xr-x 2 root root 4096 May 9 2017 run
drwxr-xr-x 3 root root 4096 May 9 2017 spool
drwxrwxrwt 2 root root 4096 May 9 2017 tmp
它将提取4096
-jenkins_home
文件大小.
值得记住的事情
- 使用简单的bash脚本,例如
ls -la /var | grep jenkins_home | cut -d " " -f5
.您上面显示的示例在我的本地bash和Jenkins服务器中均不起作用 - 在
sh
步骤中添加returnStdout: true
参数,以将命令打印的内容返回到控制台.
- use simple bash scripts like
ls -la /var | grep jenkins_home | cut -d " " -f5
. The example you have shown above does not work in my local bash as well as in the Jenkins server - add
returnStdout: true
parameter tosh
step to return what your command prints to the console.
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