On: Add-Ons Outage Post-Mortem Result

[donio]

One way is to override the libc time functions using LD_PRELOAD using something like https://github.com/wolfcw/libfaketime

This doesn't work with everything (for example doesn't work with Go because Go doesn't use libc for such things) but if it does then it's a very simple to use:

  % LD_PRELOAD=src/libfaketime.so.1 FAKETIME='1999-12-31 23:59:59' date
  Fri Dec 31 23:59:59 PST 1999

  % LD_PRELOAD=src/libfaketime.so.1 FAKETIME='1999-12-31 23:59:59' python  -c 'import time;print(time.ctime())'
  Fri Dec 31 23:59:59 1999

or to have the fake clock ticking starting from the specified time:

  % LD_PRELOAD=src/libfaketime.so.1 FAKETIME='@1999-12-31 23:59:59' python  -c 'import time;print(time.ctime());time.sleep(1);print(time.ctime())'
  Fri Dec 31 23:59:59 1999
  Sat Jan  1 00:00:00 2000