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stderr of the running targets can be kept on the disk by specifying -k option (or by setting $REDO_LOGS=1 environment variable) to redo. You can simultaneously use also -s option ($REDO_SILENT=1 environment variable) to silence stderr output, but still keeping it on the disk for possible further debug investigation. Only the latest build is kept, previous one is overwritten.

$ redo -xx -k -s build-the-whole-huge-project

Logs are stored in corresponding .redo/tgt.log file. Each line of it is prefixed with TAI64N timestamp, that you can decode with tai64nlocal utility from daemontools, or similar one: go install

When -k is in use, all environment variables, working directory, command line arguments, start/finish times, duration, participated PIDs, return codes are also saved in corresponding .redo/tgt.log.reg file.

You can view any target’s output with redo-log command (possibly piping to tai64nlocal). -c option also shows how exactly it was started, when started/finished and how long did it take.

-r option enables recursive serialized indented output. When you run redo in parallel, then all stderr (if no -silence was enabled) is printed as it appears, mixing output from all commands, that is hard to read and investigate. Serialized redo-log output rearranges output. I will take example from original apenwarr’s idea article. Serialized output will look like this:

$ redo-log -r A
A: ...A stuff...
A: redo-ifchange J
J: > redo J
J: > ...J stuff...
J: > redo-ifchange X Y
X: > > redo X
X: > > ...X stuff...
X: > > done X
J: > > redo Y
Y: > > ...Y stuff...
Z: > > > redo Z
Z: > > > ...Z stuff...
Z: > > > done Z
Y: > > ...more Y stuff...
Y: > > done Y
J: > ...more J stuff...
J: > done J
A: ...more A stuff...

It will output depth first logs. It can rearrange some "events" (redo invocations): failed targets will be at the very end, because they are the most interesting ones for the human.

Pay attention that recursive output is more CPU hungry. Single target output is literally copying of .redo/tgt.log file to stdout.

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