Revision as of 22:41, 22 April 2021

Users

See Tracefile and Stack Trace on how to look up the logging information after some problem occurred.

Developers

See the Logging API documentation, as well. So each module defines its own log_domain. Best way to figure out what to use is to look at the top of the .c file and look for the LOG_MODULE. E.g. print-session.c defines G_LOG_DOMAIN "gnc.printing".

Logging in GnuCash

GnuCash leverages glib logging, with some historical and convenience macros. Since 2007 GnuCash has used an ad-hoc layer on top of glib's "gmessage.h" logging inspired by log4j. In short, messages are logged in a given log-domains and at a specific log-level. The log-domain is a "."-separated path, and a table of log levels is configured. Between the two, a tree of log-level is established. Log messages are checked against the tree before being emitted.

Configuring Logging

Logging may be configured by using either using the log.conf file or by specifying command line options when starting GnuCash from a terminal/shell.

With log.conf

The special file

since GnuCash 3.0

GNC_CONFIG_HOME/log.conf

Up to GnuCash 2.6.x

DOT_GNUCASH_DIR/log.conf

is checked for at gnucash start up; if present, its contents will configure the logging subsystem. The primary purpose of the configuration file it to setup a specific set of log-levels, though it's also useful for changing the default logging location from /tmp/gnucash.trace to stdout, stderr or another file.

The specific set of log paths that exist are going to be a function of the code at any given point, but some basic patterns will stabilize. As of Feb 13 2007, User:Jsled is using the following entries in log.conf to generally raise the log level of the app, but also to get debugging detail about file-backend and UI code changes related to scheduled transactions:

[levels]
gnc=message

gnc.bin=info
gnc.gui=info
gnc.backend.file=info

gnc.engine.sx=debug
gnc.app-util.sx=debug
gnc.backend.file.sx=debug
gnc.gui.sx=debug
gnc.gui.frequency=debug
    
GLib=error
    
[output]
to=stderr

Note

• These settings are probably not suitable for your purpose, but serve as an example of what's possible.
• Configuring using log.conf will change logging behavior for all versions of gnucash run by you as a user. This may not be convenient if you use a stable production version for accounting and work on a development version as the same user on the same computer

Command Line Options

The full list of command options can be obtained by entering in a shell (provided that the GnuCash bin folder is in PATH or the current folder of the shell):

Windows

Microsoft Windows Graphical programs can't ordinarily deliver text output to a shell window so gnucash --help is of little use. As of GnuCash 4.5 the output is:

bin/gnucash [options] [datafile] - GnuCash, accounting for personal and small business finance:

Common Options:
  -h [ --help ]           Show this help message
  -v [ --version ]        Show GnuCash version
  --debug                 Enable debugging mode: provide deep detail in the
                          logs.
                          This is equivalent to: --log "=info" --log "qof=info"
                          --log "gnc=info"
  --extra                 Enable extra/development/debugging features.
  --log arg               Log level overrides, of the form
                          "modulename={debug,info,warn,crit,error}"
                          Examples: "--log qof=debug" or "--log
                          gnc.backend.file.sx=info"
                          This can be invoked multiple times.
  --logto arg             File to log into; defaults to "/tmp/gnucash.trace";
                          can be "stderr" or "stdout".
  --gsettings-prefix arg  Set the prefix for gsettings schemas for gsettings
                          queries. This can be useful to have a different
                          settings tree while debugging.

Application Options:
  --nofile                Do not load the last file opened
  --help-gtk              Show help for gtk options

Deprecated Options:
  --add-price-quotes      Add price quotes to given GnuCash datafile.
                          Note this option has been deprecated and will be
                          removed in GnuCash 5.0.
                          Please use 'gnucash-cli --quotes get <datafile>'
                          instead.
  --namespace arg         Regular expression determining which namespace
                          commodities will be retrieved.
                          Note this option has been deprecated and will be
                          removed in GnuCash 5.0.
                          Please use 'gnucash-cli --quotes get --namespace
                          <namespace> <datafile>' instead.

Other platforms

gnucash --help

The specific options which may be used from the command line to configure general logging in GnuCash are:

GTK+ options ( $gnucash --help-gtk) allow setting debugging options for GTK+.

See also API group Logging.