There is only one PostgreSQL database; the "appdb" is irrelevant.
Also use "postgresql," as it is the name of the software, whereas
"postgres" the name of the binary and colloquial name. This is minor
cleanup, but enabled by the other renames in the previous commit.
This moves the puppet configuration closer to the "roles and profiles
method"[1] which is suggested for organizing puppet classes. Notably,
here it makes clear which classes are meant to be able to stand alone
as deployments.
Shims are left behind at the previous names, for compatibility with
existing `zulip.conf` files when upgrading.
[1] https://puppet.com/docs/pe/2019.8/the_roles_and_profiles_method
There was likely more dependency complexity prior to 97766102df, but
there is now no reason to require that consumers explicitly include
zulip::apt_repository.
Installing an updated linux kernel package, as can happen during the
`apt dist-upgrade` done by the installer, can cause grub to pop up a
prompt to update its configuration file. In an unattended headless
configuration, this will stop the installation.
Explicitly configure apt to be non-interactive, and prefer the newest
configuration, during the install.
We need this information in the frontend to:
* Display the 'view in playground' option for locally echoed messages.
* When we add a UI settings for realm admins to configure their
playground choices, we'll need to use these canonicalized aliases
for displaying the option.
Hence, this tweaks the tool which generates pygments_data.json to contain
the data we need.
Bumping major PROVISION_VERSION since folks need to provision in both
directions.
Tests amended.
Now that all casper tests have been migrated to
puppeteer, there's no need for having casper
related things.
Removed the casperjs package and removed/replaced
casper in few places with puppeteer.
Only removed few of them which I'm confident
about. Also didn't make any changes in docs
as it would be easier to remove them while
adding puppeteer docs.
😛 should be the most general version, which is the one
with open eyes. Other apps do the same and it also means that :P, which
is converted to 😛 is rendered like the emoticon.
Fixes#15970.
The previous steps for standing up a new host were somewhat manual.
This further scripts the process, by using the AWS CLI to start the
instance, and pass it a "user data" script to provision itself upon
boot. This results in a hands-off provisioning process which
completes in 5min.
Additional settings are required for `~/.zulip-install-server.conf`.
It is not suited for all roles, as it assumes one instance type and
security group value. Additionally, not all of the post-provision
process is currently automated -- Nagios SSH key verification, for
instance, is still a manual step. There are also additional steps for
database or frontend servers. Regardless, this is a move toward
automated provisioning.
As of commit 87e72ac8e2 (#15267), we
need to be an owner for some of the tested functionality, not just an
administrator.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
Zulip converts :) to the 1F642 Unicode emoji and promotes the same emoji
in the popular section of the emoji picker.
Previously Zulip has labeled 1F642 as "slight smile". While that name
conforms to the Unicode standard (which describes the code point as
SLIGHTLY SMILING FACE), it didn't match our use case of the emoji.
If a user types :) or selects the first smile in the emoji picker they
probably mean to express a regular "smile" and not a "slight smile",
which raises the question why they are only smiling slightly.
This commit relabels 1F642 as 😄 and our previous 😄 263A as
:smiling_face:. Note that 263A looks different in our three supported
emoji sets, so it is not suited to be our "default smile".
This change does not require a migration since our emoji system stores
both unicode points and names and handles name changes transparently.
This adds support for a "spoiler" syntax in Zulip's markdown, which
can be used to hide content that one doesn't want to be immediately
visible without a click.
We use our own spoiler block syntax inspired by Zulip's existing quote
and math block markdown extensions, rather than requiring a token on
every line, as is present in some other markdown spoiler
implementations.
Fixes#5802.
Co-authored-by: Dylan Nugent <dylnuge@gmail.com>
Fixes#2665.
Regenerated by tabbott with `lint --fix` after a rebase and change in
parameters.
Note from tabbott: In a few cases, this converts technical debt in the
form of unsorted imports into different technical debt in the form of
our largest files having very long, ugly import sequences at the
start. I expect this change will increase pressure for us to split
those files, which isn't a bad thing.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
Automatically generated by the following script, based on the output
of lint with flake8-comma:
import re
import sys
last_filename = None
last_row = None
lines = []
for msg in sys.stdin:
m = re.match(
r"\x1b\[35mflake8 \|\x1b\[0m \x1b\[1;31m(.+):(\d+):(\d+): (\w+)", msg
)
if m:
filename, row_str, col_str, err = m.groups()
row, col = int(row_str), int(col_str)
if filename == last_filename:
assert last_row != row
else:
if last_filename is not None:
with open(last_filename, "w") as f:
f.writelines(lines)
with open(filename) as f:
lines = f.readlines()
last_filename = filename
last_row = row
line = lines[row - 1]
if err in ["C812", "C815"]:
lines[row - 1] = line[: col - 1] + "," + line[col - 1 :]
elif err in ["C819"]:
assert line[col - 2] == ","
lines[row - 1] = line[: col - 2] + line[col - 1 :].lstrip(" ")
if last_filename is not None:
with open(last_filename, "w") as f:
f.writelines(lines)
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
Generated by pyupgrade --py36-plus --keep-percent-format, but with the
NamedTuple changes reverted (see commit
ba7906a3c6, #15132).
Signed-off-by: Anders Kaseorg <anders@zulip.com>
The major PROVISION_VERSION bump would not be needed, but it was
missing in commit 5ab62a3514 (#14834),
so I’m doing it here.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
We now just have two modes for setting up a dev/test
database. This makes it easy to see these things
side-by-side, when you're trying to understand how
the two different databases get built:
# dev:
USERNAME=zulip
DBNAME=zulip
STATUS_FILE_NAME=migration_status_dev
# test:
USERNAME=zulip_test
DBNAME=zulip_test
STATUS_FILE_NAME=migration_status_test
And then we make it more explicit the things that
are common between dev and test (which are
important things to understand when troubleshooting
provision-related glitches):
SEARCH_PATH=zulip,public
PASSWORD=$("$(dirname "$0")/../../scripts/get-django-setting" LOCAL_DATABASE_PASSWORD)
DBNAME_BASE=${DBNAME}_base
We lose some "generality" here, but passing in arbitrary
combinations of username/dbname/status_file to the script
would cause chaos for our digest checks, and all the different
template/base databases could cause confusion too.
Since in travis we don't have root access so we used to add different
srv path. As now we shifted our production suites to Circle CI
we don't need that code so removed it.
Also we used a hacky code in commit-lint-message for travis which is
now of no use.
Previously, we added support for 'none', 'plain' and 'noop' and a
function `lang = remap_language(lang)`. This also had the potential
to encourage adding more remappings- something that we deliberatly
want to keep to a minimum.
For context, Anders K doesn't want us to keep any remapping (only
keeping 'text' which is the default no-op lexer that pygments has)
and Tim wants to keep 'plain' and 'text'. We should only document
and advertise 'text'.
Avatar images for bots used by the tool to generate integration
documentation screenshots are pre-generated and committed to the repository.
The `generate-integration-docs-screenshot` tool now uses these images,
instead of trying to create these avatar images on the fly.
Also, deleted the unused `create_png_from_svg` function.
So `generate-fixtures` only ever did 9 lines of code (really
3 lines of actual code) in its normal mode of operation.
But it was cluttered with lots of stuff that really only
happened when you called it with the `-force` option, which
was only invoked by `rebuild-test-database`.
Now we inline most of the code into `rebuild-test-database`.
And now `generate-fixtures` is simple (and doesn't support
a `-force` flag.
Importing cairosvg in fails in production, because `libgtk-3-dev` is not
available. This commit moves the import for `cairosvg` into the function
where it is used. This code will soon be moved into a separate script that
will not be run on production.
We no longer need to maintain duplicate code
related to where we set up the emoji
cache directory.
And we no longer need two extra steps for
people doing advanced (i.e. manual) setup.
There was no clear benefit to having provision
build the cache directory for `build_emoji`,
when it was easy to make `build_emoji` more
self-sufficient. The `build_emoji` tool
was already importing the library that has
`run_as_root`, and it was already responsible
for 99% of the create-directory kind of tasks.
(We always call `build_emoji` unconditionally from
`provision`, so there's no rationale in terms
of avoiding startup time or something.)
ASIDE:
Its not completely clear to me why we need
to put this directory in "/srv", instead of
somewhere more local (like we already do for
Travis), but maybe it's just to be like
its siblings in "/srv":
node_modules
yarn.lock
zulip-emoji-cache
zulip-npm-cache
zulip-py3-venv
zulip-thumbor-venv
zulip-venv-cache
zulip-yarn
I guess the caches that we keep in var are
dev-only, although I think some of what's under
`zulip-emoji-cache` is also dev-only in nature?
./var/webpack-cache
./var/mypy-cache
In `docs/subsystems/emoji.md` we say this:
```
The `build_emoji` tool generates the set of files under
`static/generated/emoji` (or really, it generates the
`/srv/zulip-emoji-cache/<sha1>/emoji` tree, and
`static/generated/emoji` is a symlink to that tree;we do this in
order to cache old versions to make provisioning and production
deployments super fast in the common case that we haven't changed the
emoji tooling). [...]
```
I don't really understand that rationale for the development
case, since `static/generated` is as much ignored by `git` as
'/srv' is, without the complications of needing `sudo` to create it.
And in production, I'm not sure how much time we're really saving,
as it takes me about 1.4s to fully rebuild the cache in dev, not to
mention we're taking on upgrade risk by sharing files between versions.
So, `source_emoji_dump` is not the greatest variable
name, but at least we now define it relative to its
parent instead of the `.success-stamp` file. (And
then `success_stamp` is just another join.)
For upgrade-zulip-from-git to work, we need to be able to run
update-prod-static on production systems, which means provision code
like this cairosvg logic needs to be there for now.
When creating a webhook integration or creating a new one, it is a pain to
create or update the screenshots in the documentation. This commit adds a
tool that can trigger a sample notification for the webhook using a fixture,
that is likely already written for the tests.
Currently, the developer needs to take a screenshot manually, but this could
be automated using puppeteer or something like that.
Also, the tool does not support webhooks with basic auth, and only supports
webhooks that use json fixtures. These can be fixed in subsequent commits.
Add sgrep (sgrep.dev) to tooling and include simple rule as
proof of concept. Included rule detects use of old django render
function.
Also added a rule that looks for if-else statements where both
code paths are identical.
This gives them cache-compatible URLs, and also avoids some extra
copies of the sprite sheet images.
Comments on the Octopus emoji added by tabbott.
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
This cleans up a few things:
- just yield values so we don't have to do
tedious max logic
- use values() instead of items() for
skin_variations loop
In the ideal world the emoji.json would reduce this
code to `get_square_size = lambda data: data['square_size']`,
but I don't think we can get the square size explicitly.
This commit changes the calculation of the
background-size parameter that we use to
render emojis from sprite sheets.
In particular, it now makes the parameter
match the sizes of our latest sprite
sheets from Twitter/Google.
This should fix the geometry aspect of #13959,
but we also need to fix some issues with the
cache being sticky.
There is also some minor cleanup:
- Remove obsolete -moz/-webkit CSS.
- Remove needless precision in percentages.
- Fix the transposed nrows/ncols names.
- Add extensive commenting.
Finally, we add a minor bump to the provision
number. This commit should be merged in the
same series as the other fix for this issue,
which will probably have a major bump, and we'll
need to rebase this appropriately.
webpack optimizes JSON modules using JSON.parse("{…}"), which is
faster than the normal JavaScript parser.
Update the backend to use emoji_codes.json too instead of the three
separate JSON files.
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
The reason that `pip-tools` running on Python 3 didn’t detect the
right requirements for `thumbor` on Python 2 is simply that some of
them are conditional on the Python version.
As for the requirements that had been manually added as a workaround:
`backports-abc` and `singledispatch` are now correctly detected, while
`backports.ssl-match-hostname` was vendored into `urllib3` some time
ago and `certifi` is no longer necessary.
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
This reverts commit 073ecaac66 (#9365).
This exception handler was overly broad in catching all `OSError`s,
and it made debugging harder by hiding the actual exception.
Furthermore, we no longer use NFS (#12963), and we’re now getting
reports of Windows users running into this message.
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
Now that we're implemented tsearch_extras in pure postgres, we no
longer need a custom extension. This should help us considerably, as
it means we no longer need to ship custom apt packages at all.
Fixes#467.
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
Otherwise python3 will be perpetually copied from virtualenv to
virtualenv and will never receive updates from the system.
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
Otherwise the files aren’t processed by collectstatic and don’t end up
in the staticfiles.json manifest.
Signed-off-by: Anders Kaseorg <andersk@zulipchat.com>
Previously, it didn't properly update the stamp files that determine
our caching behavior, so if one ran test-backend afterwards, nothing
would happen.
A secondary issue that this commit does not fix is that provision will
end up rerunning the whole thing.
More modern Linux versions like Bionic will block this, and what we
actually want to do is just run the code in our <<EOF block via bash,
so we should do that explicitly.
Real systemd requires this. docker-systemctl-replacement currently
doesn’t but maybe it will later.
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
This restores man pages and other documentation that have been
stripped from the default Ubuntu cloud image and installs
ubuntu-minimal and ubuntu-standard.
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
Also use psql -e (--echo-queries) in scripts that use ‘set -x’, so
errors can be traced to a specific query from the output.
Signed-off-by: Anders Kaseorg <anders@zulipchat.com>
/bin/sh and /usr/bin/env are the only two binaries that NixOS provides
at a fixed path (outside a buildFHSUserEnv sandbox).
This discussion was split from #11004.
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
In tools/setup/install-aws-server line 25:
zulip_root=${ZULIP_ROOT:-$HOME/zulip}
^-- SC2034: zulip_root appears unused. Verify use (or export if used externally).
In tools/setup/install-aws-server line 40:
if [ -n "$zulip_confdir" ]; then
^-- SC2154: zulip_confdir is referenced but not assigned.
In tools/setup/install-aws-server line 55:
VIRTUALENV_NEEDED=$(if $(echo "$type" | grep -q app_frontend); then echo -n yes; else echo -n no; fi)
^-- SC2091: Remove surrounding $() to avoid executing output.
In tools/setup/install-aws-server line 60:
SSH_OPTS=(-o HostKeyAlgorithms=ssh-rsa)
^-- SC2191: The = here is literal. To assign by index, use ( [index]=value ) with no spaces. To keep as literal, quote it.
In tools/setup/install-aws-server line 69:
ssh "${SSH_OPTS[@]}" "$server" -t -i "$amazon_key_file" -lroot <<EOF
^-- SC2087: Quote 'EOF' to make here document expansions happen on the server side rather than on the client.
In tools/setup/install-aws-server line 86:
ssh "${SSH_OPTS[@]}" "$server" -t -i "$amazon_key_file" -lroot <<EOF
^-- SC2087: Quote 'EOF' to make here document expansions happen on the server side rather than on the client.
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
In tools/setup/postgres-init-dev-db line 10:
ROOT_POSTGRES="sudo -i -u "$DEFAULT_USER" psql"
^-- SC2027: The surrounding quotes actually unquote this. Remove or escape them.
In tools/setup/postgres-init-dev-db line 46:
echo 'ERROR: Try `sudo service postgresql start`?'
^-- SC2016: Expressions don't expand in single quotes, use double quotes for that.
In tools/setup/postgres-init-dev-db line 64:
PGPASS_ESCAPED_PREFIX="*:\*:\*:$USERNAME:"
^-- SC1117: Backslash is literal in "\*". Prefer explicit escaping: "\\*".
^-- SC1117: Backslash is literal in "\*". Prefer explicit escaping: "\\*".
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Instead of using a hardcoded value for spritesheet dimensions,
automatically calculate it using `emoji_data`. This will free
us from updating it only emoji datasource update as well as
allow us to add google blob emojiset.
This will help us in reducing the size of the release tarball
significantly. I have refrained from changing the `EMOJISETS`
constant in the `emoji_setup_utils.py` as that controls the
emojisets that we want to support. Since we want to re-enable
the feature of changing emojisets sometime again in the future
that variable should be kept as it is as it controls several
other things like emoji scripts that we use to generate emoji
names. Changing it might cause hard to catch bugs.
`emoji-datasource` package v4.0.4 introduced the concept of qualified
and non-qualified emoji codes. As chat programs don't need to use
emoji representation selector, so we used migrated our infrastructure
to use non-qualified emoji codes. But we missed the fact that the
emoji file names in emoji farm are based on emoji data's 'unified'
field and the value of this field has changed. Consequently the image
file names must also have been changed. We used `emoji_code` while
converting the span tags to img tags while processing notifications.
But since now `emoji_code` refers to non-qualified code while image
file names are based on qualified code, we need to rename images
to correctly do the conversion. This commit just fixes this.
This commit closes a long pending issue which involved moving the
`EMOTICON_CONVERSION` mapping to build_emoji infrastructure so
that there is only one source of truth. This was pending from the
time when this feature was implemented.
This commit updates the `emoji-datasource` packages to version 4.0.4.
This update brings following changes to emoji infra:
1: Fix for the bleeding sprite sheets.
2: The category of some emojis has been changed. Categorywise breakup of
net gain or loss is as follows:
Travel & Places: 58 (gain)
Symbols: 47 (loss)
Smileys & People: 52 (gain)
Objects: 11 (loss)
Food & Drink: 3 (gain)
Animals and Nature: 46 (gain)
Activities: 9 (loss)
3: There were some changes in the image farm of the package which were
breaking our old emoji farm. I fixed them by modifying the remapped
emoji map.
Fixes: #8235.
Google emojiset's octopus is really cute and whole Zulip community
loves it. So using a CSS hack, we hardcode octopus emoji to use image
from Google's emojiset only irrespective of the choosen emojiset.
This migrates Zulip to use a dramatically better set of names and
aliases for our emoji set, defined in emoji_names.py (which is in turn
manually generated from our hand-curated CSV file).
This should significantly improve the experience of using Zulip's
emoji picker and emoji typeahead for finding what one is looking for.
Credits to @rishig, Alice Lai, and @rntharu for naming all the emoji.
Names are inspired by iamcal, gemoji, and unicode names, sources like
emojipedia and iemoji, google search results for articles about emoji,
and emoji usage on twitter.
This will be helpful in the upcoming changes which will make use
of this extracted function to re-create zulip_test_template after
migrating zulip_test db so that we have latest schema in tests.
This is required because the --settings=zproject.test_settings param
doesn't work with migrate or the dumpdata management commands. Thus
untill now if one ran just this tool ended up with test database not
properly setup. We never noticed this because test-backend ran this
tool again (after exporting DJANGO_SETTINGS_MODULE) thus making the
tool work this time.
This commit switches our emoji infrastructure to use 256 color indexed
64px spritesheets. Earlier we were using non-indexed 32px spritesheets
which were blurry on high dpi displays. These indexed spritesheets not
only provide a crispier display but are also smaller in size.
This commit also removes the `emoji-datasource` package as a dependency
as all the data is now sourced from individual datasource packages.
Fixes: #7862.
For now, this does nothing in a production environment, but it should
simplify the process of doing testing on the Thumbor implementation,
by integrating a lot of dependency management logic.
At this point if we were accidentally using `/srv/zulip-venv` for
anything, we'd have run into it by now. So just drop the bit of
historical logic that we had to ensure that.
tools/setup/generate_zulip_bots_static_files now starts off by
deleting static/generated/bots/ (if it hasn't been removed already)
so that outdated static files from older versions of the zulip_bots
package don't supress errors in the main repo that would otherwise
break.
For more info, see #7542Fixes: #7542.
This commit renames various source requirements files like `dev.txt`,
`mypy.txt` etc to `dev.in`, `mypy.in` etc and various locked requirements
files like `dev_lock.txt`, `mypy_lock.txt` etc to `dev.txt`, `mypy.txt`
etc. This will help in emphasizing to the user that *.in are actually
input to `update-locked-requirements` tool which should be run after
updating any of these.
This commit helps reduce clutter on the navigation sidebar.
Creates new directories and moves relevant files into them.
Modifies index.rst, symlinks, and image paths accordingly.
This commit also enables expandable/collapsible navigation items,
renames files in docs/development and docs/production,
modifies /tools/test-documentation so that it overrides a theme setting,
Also updates links to other docs, file paths in the codebase that point
to developer documents, and files that should be excluded from lint tests.
Note that this commit does not update direct links to
zulip.readthedocs.io in the codebase; those will be resolved in an
upcoming follow-up commit (it'll be easier to verify all the links
once this is merged and ReadTheDocs is updated).
Fixes#5265.
This should mean that maintaining two Zulip development environments
using the same Git checkout no longer has caching problems keeping
track of the migration status.
Emojis which are represented by a sequence of codepoints or emojis
with ZWJ are not included until we implement a mechanism for dealing
with their unicode versions.
Fixes: #6279.
Tweaked by tabbott to not remove it from lister.py, linter_lib, and
friends, since those are intended to support both Python 2 and 3
(we're planning to extract them from the repository).
This hack was used to fix the broken number emojis in the emoji picker.
It was broken because of the partial migration to the iamcal dataset.
See issue #4775 for more details.
This hack was used to fix the broken flag emojis in emoji-picker.
It was broken due to the incomplete migration to iamcal dataset.
See issue #4775 for more details.
This commit switches to use sprite sheets for rendering emojis
in all the remaining places, i.e., message bodies and composebox
typeahead. This commit also includes some changes to notifications.py
file so that the spans used for rendering emojis can be converted
to corresponding image tags so that we don't break the emoji rendering
in missed message emails since we can't use sprite sheets there.
As part of switching the bugdown system to use sprite sheets, we need
to switch the name_to_codepoint mappings to match the new sprite
sheets. This has the side effect of fixing a bunch of emoji like
numbers and flag emoji in the emoji pickers.
Fixes: #3895.
Fixes: #3972.
This function was used get a black and white glyph for an emoji if there
was no corresponding image file present in the `NotoColorEmoji.ttf` but
due to the new emoji farm setup code, we no longer need this.
This function was used to color transparent number emojis. We no
longer need to do this since now we have remapped number emojis
to the corresponding colored emojis in the new emoji farm.
We have symlinked the old emoji farm to the old emoji farm and hence
we don't use the images from the `NotoColorEmoji.ttf` file. This
function was used to generate a map from codepoint to filename by
parsing the ttx file passed to it. We no longer need this map.
This commit extracts out the `generate_map_files()` function from
the `dump_emojis()` function. This function generates various data
files like `emoji_codes.js`, `name_to_codepoint.json` etc which are
used by webapp, bugdown etc.
This commit removes the old emoji farm generation code in favor of
`setup_old_emoji_farm()`. Instead of having individual images in old
emoji farm we now symlink them to the images in the new emoji farm.
This commit adds `setup_old_emoji_farm()` function to the build_emoji
script. This will change the way of setting up the old emoji farm.
Earlier we used to extract the glyphs corresponding to each emoji from
the `NotoColorEmoji.ttf` file. But since now we already have individual
images in the new emoji farm(from iamcal's 'emoji-datasource-google' npm
package) we can just symlink old emoji files to the new image files. This
apart from helping us in cleaning up the `build_emoji` script will also
help in reducing the increased size of the release tarball due to the
addition of new emoji farm.
This commit implements support for copying over static files
for all bots in the zulip_bots package to
static/generated/bots/ during provisioning. This directory
isn't tracked by Git. This allows us to have access to files
stored in an arbitrary zulip_bots package directory somewhere
on the system. For now, logo.* and doc.md files are copied over.
This commit should act as a starting point for extending our
macro-based Markdown framework to our bots/API packages'
documentation and eventually rendering these static files
alongside our webhooks' documentation.
This enforces our use of a consistent style in how we access Python
modules; "from os.path import dirname" is a particularly popular
abbreviation inconsistent with our style, and so it deserves a lint
rule.
Commit message and error text tweaked by tabbott.
Fixes#6543.
Travis enables different Python versions through virtual environments,
but it seems that there is a little caveat when we try to create Zulip's
virtual environment by referring Travis' virtual environment; Zulip's
virtual environment refers the system Python. We encountered this
behaviour when we tried to run our backend test suite under Python 3.5
in Travis. 'python3 --version' command before activating Zulip's
virtualenv showed 'Python 3.5.3' and after it showed 'Python 3.4.3'.
This happened when we created the virtual environment using
'virtualenv -p python3'.
The solution seems to be to explicitly give the path of the Python
interpreter in the Travis' virtual environment using 'which python3'.
This causes `upgrade-zulip-from-git`, as well as a no-option run of
`tools/build-release-tarball`, to produce a Zulip install running
Python 3, rather than Python 2. In particular this means that the
virtualenv we create, in which all application code runs, is Python 3.
One shebang line, on `zulip-ec2-configure-interfaces`, explicitly
keeps Python 2, and at least one external ops script, `wal-e`, also
still runs on Python 2. See discussion on the respective previous
commits that made those explicit. There may also be some other
third-party scripts we use, outside of this source tree and running
outside our virtualenv, that still run on Python 2.