Description of problem: augtool uses 100% CPU for about 30 seconds when you hit the tab key at a certain point. Version-Release number of selected component (if applicable): augeas-0.7.3-1.fc14.x86_64 How reproducible: Always. Steps to Reproduce: 1. As root, run augtool 2. Type: ls //fi 3. Hit the <tab> key. Actual results: augtool spins using 100% CPU for about 30 seconds. Also augtool is unresponsive during this time. Expected results: Should tab-complete the path or otherwise remain responsive. Additional info:
The problem is that hitting <TAB> there causes aug_match("//*",...) to be run to get possible completions. Unfortunately, that path expression is extremely expensive to evaluate, and process for completion, since it matches every node in the tree, anywhere in the tree. And the autocompletion code needs to go through and check if the label starts with 'fi'. Not sure how to fix this .. maybe not allow auto-completion of path expressions with '//' in them ? Or w
I wonder if it's possible to estimate the cost of an expression before evaluating it, and perhaps (in autocomplete) give up or print a message. I think I was confused when I filed the BZ, thinking that all Augeas paths start with double // which of course they don't.
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