Two days only partially spent on debug-me..

Yesterday a few small improvements, but mostly I discovered the posix-pty library, and converted debug-me to use it rather than wrangling ptys itself. Which was nice because it let me fix resizing. However, the library had a bug with how it initializes the terminal, and investigating and working around that bug used up too much time. Oh well, probably still worth it.

Today, made debug-me serialize to and from JSON.

{"signature":{"v":""},"prevActivity":null,"activity":{"seenData":{"v":">>> debug-me session starting\r\n"}}}
{"signature":{"v":""},"prevActivity":{"hashValue":{"v":"fb4401a717f86958747d34f98c079eaa811d8af7d22e977d733f1b9e091073a6"},"hashMethod":"SHA256"},"activity":{"seenData":{"v":"$ "}}}
{"signature":{"v":""},"prevActivity":{"hashValue":{"v":"cfc629125d93f55d2a376ecb9e119c89fe2cc47a63e6bc79588d6e7145cb50d2"},"hashMethod":"SHA256"},"activity":{"echoData":{"v":""},"enteredData":{"v":"l"}}}
{"signature":{"v":""},"prevActivity":{"hashValue":{"v":"cfc629125d93f55d2a376ecb9e119c89fe2cc47a63e6bc79588d6e7145cb50d2"},"hashMethod":"SHA256"},"activity":{"seenData":{"v":"l"}}}
{"signature":{"v":""},"prevActivity":{"hashValue":{"v":"3a0530c7739418e22f20696bb3798f8c3b2caf7763080f78bfeecc618fc5862e"},"hashMethod":"SHA256"},"activity":{"echoData":{"v":""},"enteredData":{"v":"s"}}}
{"signature":{"v":""},"prevActivity":{"hashValue":{"v":"3a0530c7739418e22f20696bb3798f8c3b2caf7763080f78bfeecc618fc5862e"},"hashMethod":"SHA256"},"activity":{"seenData":{"v":"s"}}}
{"signature":{"v":""},"prevActivity":{"hashValue":{"v":"91ac86c7dc2445c18e9a0cfa265585b55e01807e377d5f083c90ef307124d8ab"},"hashMethod":"SHA256"},"activity":{"echoData":{"v":""},"enteredData":{"v":"\r"}}}
{"signature":{"v":""},"prevActivity":{"hashValue":{"v":"91ac86c7dc2445c18e9a0cfa265585b55e01807e377d5f083c90ef307124d8ab"},"hashMethod":"SHA256"},"activity":{"seenData":{"v":"\r\n"}}}
{"signature":{"v":""},"prevActivity":{"hashValue":{"v":"cc97177983767a5ab490d63593011161e2bd4ac2fe00195692f965810e6cf3bf"},"hashMethod":"SHA256"},"activity":{"seenData":{"v":"AGPL\t    Pty.hs    Types.hs\t  debug-me.cabal  dist\r\nCmdLine.hs  Setup.hs  Val.hs\t  debug-me.hs\t  stack.yaml\r\n"}}}

That's a pretty verbose way of saying: I typed "ls" and saw the list of files. But it compresses well. Each packet for a single keystroke will take only 37 bytes to transmit as part of a compressed stream of JSON, and 32 of those bytes are needed for the SHA256 hash. So, this is probably good enough to use as debug-me's wire format.

(Some more bytes will be needed once the signature field is not empty..)

It's also a good logging format, and can be easily analized to eg, prove when a person used debug-me to do something bad.

Wrote a quick visualizor for debug-me logs using graphviz. This will be super useful for debug-me development if nothing else.