[PATCH 0/4] trace2: load trace2 settings from system config

Teach git to load default Trace2 settings from the system config (usually "/etc/gitconfig"). The existing GIT_TR2_* environment variables can be used to override the new system defaults. It also includes a little startup refactoring.

Note: I found interactive testing of this feature to be awkward on some
platforms because of the use of prefix- or runtime-prefix-relative locations
for the system configuration. It was easy to accidentally use an officially
installed version of git to set a system config variable in the official
system config directory; and then when testing with the test version of git,
that value would not be seen because it was looking for the system config
file in a different directory.

Jeff Hostetler (4):
  trace2: refactor setting process starting time
  trace2: add absolute elapsed time to start event
  trace2: find exec-dir before trace2 initialization
  trace2: use system config for default trace2 settings

 Documentation/technical/api-trace2.txt |  54 +++++++++--
 Makefile                               |   1 +
 common-main.c                          |   6 +-
 compat/mingw.c                         |   2 +
 t/t0210-trace2-normal.sh               |  41 +++++++-
 t/t0211-trace2-perf.sh                 |  53 ++++++++---
 t/t0212-trace2-event.sh                |  52 +++++++++-
 trace2.c                               |  19 +++-
 trace2.h                               |  24 ++++-
 trace2/tr2_cfg.c                       |   7 +-
 trace2/tr2_dst.c                       |  24 ++---
 trace2/tr2_dst.h                       |   3 +-
 trace2/tr2_sysenv.c                    | 125 +++++++++++++++++++++++++
 trace2/tr2_sysenv.h                    |  36 +++++++
 trace2/tr2_tgt.h                       |   1 +
 trace2/tr2_tgt_event.c                 |  24 ++---
 trace2/tr2_tgt_normal.c                |  13 +--
 trace2/tr2_tgt_perf.c                  |  17 ++--
 trace2/tr2_tls.c                       |  38 +++++---
 trace2/tr2_tls.h                       |   8 +-
 20 files changed, 455 insertions(+), 93 deletions(-)
 create mode 100644 trace2/tr2_sysenv.c
 create mode 100644 trace2/tr2_sysenv.h

base-commit: 041f5ea1cf987a4068ef5f39ba0a09be85952064
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-169%2Fjeffhostetler%2Fcore-tr2-startup-and-sysenv-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-169/jeffhostetler/core-tr2-startup-and-sysenv-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/169