Adding -b (buffer size) parameter to varnishtest

[Carlos Abalde]

Hi,

When implementing in VCL complex logic (not necessarily related with caching contents -e.g. access control, rate limiting, etc.-) varnishtest is a powerful tool to automate VCL testing. These type of tests sometimes are complex and they are not easy to split in smaller pieces.

In some extreme cases, the varnishlog buffer space allocated by varnishtest is not enough when testing complex VCL logic including a lot of logging. The size of that buffer is currently hard coded and it has been increased in the past [1]. This trivial patch allows selecting the size of that buffer in the command line.

[1] https://www.varnish-cache.org/trac/changeset/9511eefcdafea9a6c87f83a46d5e2b1d41c1c2c9

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Best,

--
Carlos Abalde