I.2. Changes from 2.8.4 to 2.8.5

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Added a configure script option to --enable-shared-private-libs which allows to deliver NUT common libraries as shared objects used by different NUT binaries, rather than linking just the used bits into each binary. This has some potential both for mayhem (so disabled by default) and for significant reduction of installation footprint. If enabled with a NUT packaging build, note there would be several more NUT shared library files to deliver with the packages (formally versioned and named by NUT release semantic version triplet). [issue #2800]
Related to the above, libupsclient will remove the exported symbol for nut_debug_level variable in a later NUT release, and now introduces the upscli_set_debug_level() and upscli_get_debug_level() methods. [PR #3330]
For ages, most recipes for building NUT had customized the sysconfdir to be /etc/nut, which is not exactly the system configuration directory. This is finally deprecated, with new --with-confdir configuration option taking over the role of a full path to configuration files (by default ${sysconfdir}${confdir_suffix}), and new --with-confdir-suffix allowing to specify just /nut or /ups that would be tacked onto the default ${sysconfdir} to resolve the ${confdir}. Default behavior should be same as with previous builds: if sysconfdir is customized (or prefix is kept at built-in default), the confdir_suffix will default to empty; otherwise it assumes the value of /${PACKAGE_NAME} to become /nut in most cases. A --with-confdir-examples option was also introduced, to help distributions that place *.conf.sample files into docs or other locations. [#3131]
Source directory data/html was renamed to data/htmlcgi in order to better reflect its contents and purpose, compared to documentation-oriented html* directories (and recipe variable names). This may impact some packaging recipes which do not rely on make install alone. Note that more files feature in the installation, e.g. a NUT logo rendition to use as favicon. [#3049, #3249]
Some fixes were applied to HTML templates for NUT CGI clients. It can be useful for NUT deployments being upgraded to compare the files they have installed (and possibly customized) with the *.html.sample files delivered by the new build. [PR #3180]
Introduced a @NUT_UPSSTATS_TEMPLATE@ command which the NUT CGI template files now MUST start with (safety check that we are reading a template). While the delivered upsstats*.html.sample files would include the change, ultimate upsstats*.html templates deployed for end-users MUST be updated. [issue #3252, PR #3249]
Dropped the compile script from Git sources. It originates from automake and is added to work area (if missing) during autogen.sh rituals anyway (as make says, 'automake --add-missing' can install 'compile' when you run without it). It is still distributed as part of make dist tarball. We are open to any feedback whether this removal impacts NUT rebuilds on any systems. [#1209]
Default PIDPATH is now more strictly /var/run, unless building on a system conforming to FHS-3.0 standard where that location is absent or is a symlink, while /run exists and is a true directory. Package recipes usually override --with-pidpath anyway to provide a dedicated location for NUT root-owned daemon PID files. [#3099]
The autoconf managed macro for --with-port option was renamed from plain PORT to less ambiguous NUT_PORT to avoid potential conflicts with any third-party code. If anyone did use this macro in their custom builds or integrations, some renaming (or stubbed definitions to the effect of PORT=NUT_PORT) may be needed. [#3238]
In drivers using the common main.c and main.h framework, introduced a void upsdrv_tweak_prognames(void) required method (may be no-op) to optionally tweak prognames[] entries now that there is certain support to accept program name aliases, not just one hard-coded string value. Any third-party drivers may require rebuilding to extend with this method. Any drivers that would undergo promotion with renaming can take advantage of this new facility to keep working under both old and new file names. [#3101]
The upsdrvquery* semi-internal API for talking on the driver socket was updated with default handling for SIGPIPE. If your consumer wants to catch it themselves, instead of using errno=EPIPE after a failed call, you can use upsdrvquery_NOSIGPIPE=0 to disable neutering of the signal inside the API itself. [PR #3277]
Added new API methods and defined bitmap values for libupsclient C binding to query and report SSL capabilities of the library build (none, OpenSSL, Mozilla NSS): upscli_ssl_caps_descr() and upscli_ssl_caps(). [PR #33xx]
Fixed man page naming for nutdrv_siemens-sitop(.8) (dash vs. underscore) to match the driver program name. Packaging recipes may have to be updated. Follow-up from slightly botched renaming in original contribution. [PR #545]
The configure script would now probe (if it can) the operating systems for more user and group account names, such as upsmon, nutmon, ups, nut (last hit wins, separately for user and groups accounts) settling on one of those if detected instead of nobody (and optionally nogroup). It would also warn if nobody or nogroup end up being used for a build. This is not likely to affect package builds (which usually define the accounts to use), but may (hopefully positively) affect rebuilds of NUT on systems where an older version is already deployed. [#3173]
The configure script should now try harder to report specifically the "purelib" location as PYTHON*_SITE_PACKAGES. Packaging recipes may have to be updated. [#1209]
New supported values were introduced for --with-python{,2,3}=auto-prio=NUM: this allows to auto-prioritize some one available Python interpreter. Default settings were changed from plain auto (allowing for multiple python* interpreters and site-package locations to be used), to prefer a python3 if available, else python2, else python, and forget about others even if discovered. Packaging recipes may have to be updated, either to explicitly package the binding for several versions, or to not-deliver files no longer installed into the prototype area. [#1792]
Added a configure script option to (primarily) --disable-threading for systems with detected but broken libpthread support, which can cause nut-scanner to crash while loading system libraries. [#3300]
Introduced a new driver category for interaction with OS-reported UPS devices via D-Bus, with the nut-upower driver as the first implementation. This driver requires glib-2.0 and gio-2.0 development libraries to be available at build time. For packagers, this adds new dependencies if the build should include this driver. [PR #3279]