In my working environment, we are managing more Linux based Agent machines for building the solution to create artifacts and we got required to clean the build artifacts on regular manner in automatic way so we though to write a bash scrip and make this as scheduled in release pipeline (Delete File or Directory in Linux). Base on my automation, though to write a post to explain How to Delete File or Directory in Linux with Scheduled Azure DevOps Pipeline
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step 1: Find the disk space usage
The df -h command is used to display information about disk space usage on a Unix-like system. When you run this command in a terminal, it will show the disk space usage in a human-readable format.
For more clear, disk free also known as df, which is a powerful utility that provides valuable information on disk space utilization. The df command displays information about file system disk space usage on the mounted file system. The -h flag makes the sizes human-readable, using units like KB, MB, GB, etc.
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df -h |
STEP 2:Get list of directories/files and assign to variable
Before we can remove a folder or director, we must first know its name. Therefore, we must first execute the “ls” command in the terminal to find a folder or directory, or to view all of the folders. In Linux and other operating systems based on Unix, the “ls” command is used to display the files or folders.
As i am going to clean my agent folder so path will be /agent/_work.
We are assigning the output of the command ls /agent/_work/ | grep [0-9] to the variable directorylist. This command lists the contents of the /agent/_work/ directory and filters the results to include only lines that contain numbers (as my agent machine folder will create with name as numbers).
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directorylist=$(ls /agent/_work/ | grep [0-9]) |
STEP 3: Loop the list of directories and delete
Next, we need to loop the directory list one by one in the while loop as shown in below script. while read line is a loop that reads each line of the processed output ( is used for bash shell to read a file using while loop).The option ‘-r’ in the above-mentioned syntax passed to read command that avoids the backslash escapes from being interpreted
- tr ‘ ‘ ‘\n’: one of the use of tr command is to find and replace, here it will replace spaces with newline characters.
- The loop body (between do and done) is where you can put your processing logic for each line. I’ve included a simple echo statement as an example.
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echo $directorylist | tr ' ' '\n' | while read -r line do ........... You logic to delete ........... Done |
STEP 4: Remove the directory/file from the list
We can Delete File or Directory in Linux by using rm command and -rf will be used to remove fore fully as shown below.
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echo "removing folder $line" rm -rf /agent/_work/$line |
Full code: Delete File or Directory in Linux
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# Find the disk space usage df -h echo "Running a disk space clean up" #Get list of directories/files and assign to variable directorylist=$(ls /agent/_work/ | grep [0-9]) #Loop the list of directries and delete echo $directorylist | tr ' ' '\n' | while read line do echo "removing folder $line" rm -rf /agent/_work/$line done |
How to implement delete directory (above script) script in scheduled manner Azure DevOps pipeline?
- First enable the “Scheduled release trigger” as shown below in release pipeline. In same pipeline, create a new stage with the Bash task with the above script which shown to Delete File or Directory in Linux .
- Select the stage and click “pre-deployment condition” and schedule the pipeline condition when it need to execute and save. Post this action, the pipeline will ran on specific time and execute the cleanup task.
