Rob Norris 48c9b2e79d ZTS: include microsecond timestamps on all output
When reviewing test output after a failure, it's often quite difficult
to work out the order and timing of events, and to correlate test suite
output with kernel logs.

This adds timestamps to ZTS output to help with this, in three places:

- all of the standard log_XXX functions ultimately end up in _printline,
  which now prefixes output with a timestamp. An escape hatch
  environment variable is provided for user_cmd, which often calls the
  logging functions while also depending on the captured output.

- the test runner logging function log() also now prefixes its output
  with a timestamp.

- on failure, when capturing the kernel log in zfs_dmesg.ksh, the "iso"
  time format is requested.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #17045
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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.

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Official Resources

Installation

Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.

Contribute & Develop

We have a separate document with contribution guidelines.

We have a Code of Conduct.

Release

OpenZFS is released under a CDDL license. For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are any supported branches and releases starting from 13.0-RELEASE.
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