Issue:
You are using Acquia Cloud Site Factory with BLT, you can see an entry similar to :
Starting hook: post-code-deploy
Executing: /mnt/users/docroot/environment.shell /var/www/html/docroot.environment/hooks/common/post-code-deploy/post-code-deploy.sh ... in the Acquia Cloud Site Factory Task logs DocrootUpdate task and the deployment is failing.
Resolution:
Remove the failing post-code-deploy hook from the project codebase as it is not supported on Acquia Cloud Site Factory. A list of Acquia Cloud Site Factory supported hooks can be found in Hooks in Acquia Cloud Site Factory
Cause:
BLT is known to regenerate hooks on when updating it, the hook was likely accidentally committed.