Provides almost the same functionality, but without convoluted
functional style. This will allow us to provide VCS specific
instructions in the future.
This sets HGPLAIN and GIT_CONFIG_NOSYSTEM to bypass local user
version control system configuration when the build script is invoked.
If not set, the version control system's output could be influenced
by configuration settings. It was for example discovered that if
you have "hg log" default to --follow, this slows down the Gecko
build significantly since it prints the node for every single commit.
According to hg(1) it is highly recommended for programs invoking
hg to set this.
Because we no longer can tag geckodriver releases in mozilla-central,
we need to include build information in the program itself. In the
version information message displayed when passing the --version flag,
we now include the current tip's SHA1 and build date following the
version number.
This patch could be made simpler by dumping this information correctly
formatted into a text file in the output directory, but it was requested
in https://bugzilla.mozilla.org/show_bug.cgi?id=1374977 to also include
the version information in the log output, which means we need to access
it differently and in different places.
MozReview-Commit-ID: CbFQn7IV8ew
--HG--
extra : rebase_source : dcc38ba7b5f209e9878755d5d75b611e22b5253d
Andreas Tolfsen
Jeremy Lempereur