Added a way to get build configuration info from the agent. (#9913)

* Add a way to get build configuration info from the agent.

This adds a new option to the `-W` switch called 'buildinfo'. When
invoked with this argument, Netdata will print it's version, the
configure options, and a list of optional features and whether they are
enabled or not.

This is intended to serve three purposes:

* It allows developers to more quickly get an idea of how Netdata was
  built when triaging bug reports.
* It provides an easier way to validate changes to the build system that
  affect optional features during the development cycle.
* It provides an easier way to build CI workflows that validate that
  building under a given set of constraints results in a feature being
  enabled or not.

The actual implementation is a bit large but overall exceedingly simple,
consisting of a set of preprocessor directives to extract optional
feature state information from config.h and then a series of printf()
calls to actually report this info (which should end up optimized by
smart compilers due to all the arguments being compile-time constants).

* Added zlib to optional libraries.

* Added remaining optional plugins to buildinfo output.

* Changed formatting to be more human friendly.

* Add remaining optional libraries.

* Fix up formatting to be even more human friendly.

* Fix typo in buildinfo output.

* Remove unused variable.

* Fixed spelling of config.h option name.

* Update daemon/buildinfo.c

Co-authored-by: Markos Fountoulakis <44345837+mfundul@users.noreply.github.com>

* Fix option name mismatch for libcrypto.

* Update daemon/buildinfo.c

Co-authored-by: Markos Fountoulakis <44345837+mfundul@users.noreply.github.com>

Co-authored-by: Markos Fountoulakis <44345837+mfundul@users.noreply.github.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/configure.ac b/configure.ac
index 800664de47..f9379a9bfa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,7 +43,6 @@ AC_PROG_INSTALL
 PKG_PROG_PKG_CONFIG
 AC_USE_SYSTEM_EXTENSIONS
 
-
 # -----------------------------------------------------------------------------
 # configurable options
 
@@ -329,7 +328,6 @@ AC_CHECK_LIB(
 )
 
 
-
 # -----------------------------------------------------------------------------
 # zlib
 
@@ -382,6 +380,9 @@ AC_CHECK_LIB(
     [ssl_host_validation="no"]
 )
 
+test -z "${SSL_LIBS}" || \
+    AC_DEFINE([HAVE_CRYPTO], [1], [libcrypto availability])
+
 if test "${ssl_host_validation}" = "no"; then
     AC_DEFINE([HAVE_X509_VERIFY_PARAM_set1_host], [0], [ssl host validation])
     AC_MSG_WARN([DISABLING SSL HOSTNAME VALIDATION BECAUSE IT IS NOT AVAILABLE ON THIS SYSTEM.])
@@ -705,6 +706,7 @@ AM_CONDITIONAL([ENABLE_ACLK], [test "${enable_aclk}" = "yes"])
 
 AC_MSG_CHECKING([if apps.plugin should be enabled])
 if test "${build_target}" != "macos"; then
+    AC_DEFINE([ENABLE_APPS_PLUGIN], [1], [apps.plugin])
     enable_plugin_apps="yes"
 else
     enable_plugin_apps="no"
@@ -972,6 +974,7 @@ AC_CHECK_HEADER(
 
 AC_MSG_CHECKING([if perf.plugin should be enabled])
 if test "${build_target}" == "linux" -a "${have_perf_event}" = "yes"; then
+    AC_DEFINE([ENABLE_PERF_PLUGIN], [1], [perf.plugin])
     enable_plugin_perf="yes"
 else
     enable_plugin_perf="no"
@@ -1023,6 +1026,7 @@ AM_CONDITIONAL([ENABLE_PLUGIN_EBPF], [test "${enable_ebpf}" = "yes"])
 
 AC_MSG_CHECKING([if slabinfo.plugin should be enabled])
 if test "${build_target}" == "linux"; then
+    AC_DEFINE([ENABLE_SLABINFO], [1], [slabinfo plugin])
     enable_plugin_slabinfo="yes"
 else
     enable_plugin_slabinfo="no"
@@ -1459,6 +1463,14 @@ TEST_LIBS="${CMOCKA_LIBS}"
 AC_SUBST([TEST_CFLAGS])
 AC_SUBST([TEST_LIBS])
 
+# -----------------------------------------------------------------------------
+# save configure options for build info
+AC_DEFINE_UNQUOTED(
+    [CONFIGURE_COMMAND],
+    ["$ac_configure_args"],
+    [options passed to configure script]
+)
+
 AC_CONFIG_FILES([
     Makefile
     netdata.spec