Please provide the following details to expedite Pull Request review:
Checklist
- [x] Checked if it requires a pylibjuju change? No
- [x] Added integration tests for the PR? Yes
- [x] Added or updated doc.go related to packages changed? No
- [x] Do comments answer the question of why design decisions were made?
Description of change
Rewrite fill-unit action/function for fill-logs testing charm (previously the function write a huge amount of data into stdout causing uniter memory leak);
Driveby fix: ensure function hook commands working correctly;
QA steps
console
# bootstrap
$ juju bootstrap aws/ap-southeast-2 k1 --debug
# deploy fill-logs
$ juju add-model t1 aws && juju deploy acceptancetests/repository/charm/fill-logs --debug
# run function
$ export JUJU_DEV_FEATURE_FLAGS=juju-v3
$ juju call fill-logs/0 fill-unit megs=100 -m k1:t1 --max-wait=2m
# check log
$ juju ssh -m k1:t1 0
$ watch ls -al /var/log/juju/unit-fill-logs*
Documentation changes
No
Bug reference
No
该提问来源于开源项目：juju/juju
