123 lines
3 KiB
Markdown
123 lines
3 KiB
Markdown
retry - The command line retry tool
|
|
------------------------------------------
|
|
|
|
Retry any shell command with exponential backoff or constant delay.
|
|
|
|
### Instructions
|
|
|
|
Install:
|
|
|
|
retry is a shell script, so drop it somewhere and make sure it's added to your $PATH. Or you can use the following one-liner:
|
|
|
|
```sh
|
|
sudo sh -c "curl https://raw.githubusercontent.com/kadwanev/retry/master/retry -o /usr/local/bin/retry && chmod +x /usr/local/bin/retry"
|
|
```
|
|
|
|
If you're on OS X, retry is also on Homebrew:
|
|
|
|
```
|
|
brew pull 27283
|
|
brew install retry
|
|
```
|
|
Not popular enough for homebrew-core. Please star this project to help.
|
|
|
|
### Usage
|
|
|
|
Help:
|
|
|
|
`retry -?`
|
|
|
|
Usage: retry [options] -- execute command
|
|
-h, -?, --help
|
|
-v, --verbose Verbose output
|
|
-t, --tries=# Set max retries: Default 10
|
|
-s, --sleep=secs Constant sleep amount (seconds)
|
|
-m, --min=secs Exponenetial Backoff: minimum sleep amount (seconds): Default 0.3
|
|
-x, --max=secs Exponenetial Backoff: maximum sleep amount (seconds): Default 60
|
|
-f, --fail="script +cmds" Fail Script: run in case of final failure
|
|
|
|
### Examples
|
|
|
|
No problem:
|
|
|
|
`retry echo u work good`
|
|
|
|
u work good
|
|
|
|
Test functionality:
|
|
|
|
`retry 'echo "y u no work"; false'`
|
|
|
|
y u no work
|
|
Before retry #1: sleeping 0.3 seconds
|
|
y u no work
|
|
Before retry #2: sleeping 0.6 seconds
|
|
y u no work
|
|
Before retry #3: sleeping 1.2 seconds
|
|
y u no work
|
|
Before retry #4: sleeping 2.4 seconds
|
|
y u no work
|
|
Before retry #5: sleeping 4.8 seconds
|
|
y u no work
|
|
Before retry #6: sleeping 9.6 seconds
|
|
y u no work
|
|
Before retry #7: sleeping 19.2 seconds
|
|
y u no work
|
|
Before retry #8: sleeping 38.4 seconds
|
|
y u no work
|
|
Before retry #9: sleeping 60.0 seconds
|
|
y u no work
|
|
Before retry #10: sleeping 60.0 seconds
|
|
y u no work
|
|
etc..
|
|
|
|
Limit retries:
|
|
|
|
`retry -t 4 'echo "y u no work"; false'`
|
|
|
|
y u no work
|
|
Before retry #1: sleeping 0.3 seconds
|
|
y u no work
|
|
Before retry #2: sleeping 0.6 seconds
|
|
y u no work
|
|
Before retry #3: sleeping 1.2 seconds
|
|
y u no work
|
|
Before retry #4: sleeping 2.4 seconds
|
|
y u no work
|
|
Retries exhausted
|
|
|
|
Bad command:
|
|
|
|
`retry poop`
|
|
|
|
bash: poop: command not found
|
|
|
|
Fail command:
|
|
|
|
`retry -t 3 -f 'echo "oh poopsickles"' 'echo "y u no work"; false'`
|
|
|
|
y u no work
|
|
Before retry #1: sleeping 0.3 seconds
|
|
y u no work
|
|
Before retry #2: sleeping 0.6 seconds
|
|
y u no work
|
|
Before retry #3: sleeping 1.2 seconds
|
|
y u no work
|
|
Retries exhausted, running fail script
|
|
oh poopsickles
|
|
|
|
Last attempt passed:
|
|
|
|
`retry -t 3 -- 'if [ $RETRY_ATTEMPT -eq 3 ]; then echo Passed at attempt $RETRY_ATTEMPT; true; else echo Failed at attempt $RETRY_ATTEMPT; false; fi;'`
|
|
|
|
Failed at attempt 0
|
|
Before retry #1: sleeping 0.3 seconds
|
|
Failed at attempt 1
|
|
Before retry #2: sleeping 0.6 seconds
|
|
Failed at attempt 2
|
|
Before retry #3: sleeping 1.2 seconds
|
|
Passed at attempt 3
|
|
|
|
### License
|
|
|
|
Apache 2.0 - go nuts
|