Under the hood, browsertime invokes a certain `visualmetrics.py`
script. That script depends on `ffmpeg` and ImageMagick's `convert`,
`compare`, and `mogrify` commands. It also depends on certain Python
packages.
So this installs those dependencies, and then wires up the evaluation
environment such that `./mach browsertime` can find the dependencies.
It also adds a `./mach visualmetrics` command for processing a
captured MP4 file in the same way that browsertime processes such a
file.
In order to avoid downloading dependencies multiple time, the existing
artifact cache is extracted. This is a small first step towards [Bug
1526021](https://bugzilla.mozilla.org/show_bug.cgi?id=1526021), which
might want to use this artifact cache as well.
At this time, hashes and filesizes are not verified. During
development, the upstream files changed multiple times, and it's not
worth being completely locked down while experimenting with this
functionality. If we start running this code in automation or in more
sensitive environments, we can build fetch tasks and TC indexes to
streamline the artifact gathering process.
It is expected that a future mach command will want to invoke
browsertime without suffering the overhead of invoking Python (and
mach, which is itself bulky) so a nod is given to exposing the
relevant environment pieces.
During testing, it was discovered that [MozillaBuild doesn't ship
git](https://bugzilla.mozilla.org/show_bug.cgi?id=1503028), so that
git repositories can't be used out-of-the-box on Windows. So instead
we use a [tarball link from github.com/$USER/$REPO/tarball/$COMMIT-LIKE](https://github.blog/2008-03-03-tarball-downloads/).
Differential Revision: https://phabricator.services.mozilla.com/D29442
--HG--
extra : moz-landing-system : lando
An explanation of the Mozilla Source Code Directory Structure and links to
project pages with documentation can be found at:
https://developer.mozilla.org/en/Mozilla_Source_Code_Directory_Structure
For information on how to build Mozilla from the source code, see:
https://developer.mozilla.org/en/docs/Build_Documentation
To have your bug fix / feature added to Mozilla, you should create a patch and
submit it to Bugzilla (https://bugzilla.mozilla.org). Instructions are at:
https://developer.mozilla.org/en/docs/Creating_a_patch
https://developer.mozilla.org/en/docs/Getting_your_patch_in_the_tree
If you have a question about developing Mozilla, and can't find the solution
on https://developer.mozilla.org, you can try asking your question in a
mozilla.* Usenet group, or on IRC at irc.mozilla.org. [The Mozilla news groups
are accessible on Google Groups, or news.mozilla.org with a NNTP reader.]
Nightly development builds can be downloaded from:
https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/
- or -
https://www.mozilla.org/firefox/channel/desktop/#nightly
Keep in mind that nightly builds, which are used by Mozilla developers for
testing, may be buggy.
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