High speed scan on Ubuntu/Debian #172
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Add -cache-dbpath option to scan subcommand.
The default path of -cache-dbpath is $PWD/cache.db
Changelog cache
Vuls parses changelogs of updatable packages in the case of a target server is Ubuntu/Debian.
To get the changelog, Vuls issue apt-get changelog for each updatable packages.
Scan speed on Ubuntu/Debian was slow because apt-get changelog is slow.
So I decided to use boltdb for caching changelogs of updatable packages.
botldb: https://github.com/boltdb/bolt
apt-get policy
apt-get policy is a slow operation.
Previously Vuls issues
apt-cache policyfor each updatable package.Now Vuls issues the command only once.
Scan time
20 TIMES FASTER on Ubuntu16.04
On Ubuntu 16.04 server that has 95 updatable packages.
Before ... 3min10s
After(1st) ... 1min50s (without local cache)
After(2nd) ... 10s (with local cache)
4 TIMES FASTER on Debian8
On Debian8 server that has 34 updatable packages.
Before ... 5min
After(1st) ... 3m40s (without local cache)
After (2nd) ... 1m20s (with local cahce)