Commit Graph

1178 Commits

Author SHA1 Message Date
Alex Vandiver 52f155873f puppet: Ensure that all `scripts/lib/install` packages are installed.
These have all been required packages for some time, but this helps
keep the install-time list more clearly a subset of the upgrade-time
list.
2021-03-14 17:50:57 -07:00
Alex Vandiver 06c07109e4 puppet: Add missing semicolons left off in ba3b88c81b. 2021-03-12 15:48:53 -08:00
Alex Vandiver 024282b51e Revert "puppet: Use rabbitmq as the user for its config files."
This reverts commit 211232978f.  The
`rabbitmq` user does not exist yet on first install, and the goal is
to create the `rabbitmq-env.conf` file before the package is
installed.
2021-03-12 15:37:19 -08:00
Alex Vandiver ba3b88c81b puppet: Explicitly use the snakeoil certificates for nginx.
In production, the `wildcard-zulipchat.com.combined-chain.crt` file is
just a symlink to the snakeoil certificates; but we do not puppet that
symlink, which makes new hosts fail to start cleanly.  Instead, point
explicitly to the snakeoil certificate, and explain why.
2021-03-12 13:31:54 -08:00
Alex Vandiver 211232978f puppet: Use rabbitmq as the user for its config files.
This matches the initial ownership by the `rabbitmq-server` package.
2021-03-12 13:31:03 -08:00
Alex Vandiver ef188af82d puppet: Use two location blocks, instead of nesting them.
Directives in `location` blocks may or may not inherit from
surrounding `location` blocks; specifically, `add_header` directives
do not[1]:

> There could be several add_header directives. These directives are
> inherited from the previous configuration level if and only if there
> are no add_header directives defined on the current level.

In order to maintain the same headers (including, critically,
`Access-Control-Allow-Origin`) as the surrounding block, all
`add_header` directives must thus be repeated (which includes the
`include`).

For clarity, un-nest and repeat the entire `location` block as was
used for `/static/`, but with the additional `add_header`.  This is
preferred to the of an `if $request_uri` statement to add the header,
as those can have unexpected or undefined results[2].

[1] http://nginx.org/en/docs/http/ngx_http_headers_module.html#add_header
[2] https://www.nginx.com/resources/wiki/start/topics/depth/ifisevil/
2021-03-11 21:09:15 -08:00
Alex Vandiver 306bf930f5 puppet: Add a warning if ksplice is enabled but has no key set. 2021-03-10 17:57:20 -08:00
Alex Vandiver a215c83c2d puppet: Switch to more explicit variable rather than reuse a nagios one.
Redis is not nagios, and this only leads to confusion as to why there
is a nagios domain setting on frontend servers; it also leaves the
`redis0` part of the name buried in the template.

Switch to an explicit variable for the redis hostname.
2021-03-10 11:44:54 -08:00
Alex Vandiver a5b29398fc puppet: Only install ksplice uptrack if there is an access key. 2021-03-10 11:44:11 -08:00
Alex Vandiver 189e86e18e puppet: Set aggressive caching headers on immutable webpack files.
A partial fix for #3470.
2021-03-07 22:00:32 -08:00
Alex Vandiver e63f170027 puppet: Add access time and host to nginx access logs.
2e20ab1658 attempted to add this; but
there are multiple locations that access logs are set, and the most
specific wins.
2021-03-04 18:06:47 -08:00
Alex Vandiver 8961885b0f puppet: Add smokescreen to logrotate. 2021-03-02 17:16:38 -08:00
Alex Vandiver d938dd9d4a puppet: Document smokescreen installation, and move to puppet/zulip/.
This is more broadly useful than for just Kandra; provide
documentation and means to install Smokescreen for stand-alone
servers, and motivate its use somewhat more.
2021-03-02 17:16:38 -08:00
Alex Vandiver 2f5eae5c68 puppet: Minor formatting. 2021-02-28 17:03:29 -08:00
Alex Vandiver a759d26a32 puppet: Make ksplice config not world-readable, use 'adm' group.
This matches the configuration that ksplice itself creates the file
and directory with.
2021-02-28 17:03:29 -08:00
Tim Abbott 957c16aa77 nagios: Tweak prod load monitoring parameters.
Ultimately this monitoring isn't that helpful, but we're mainly
interested in when it spikes to very high numbers.
2021-02-26 08:39:52 -08:00
Alex Vandiver 32149c6a1c puppet: Add ksplice uptrack for kernel hotpatches. 2021-02-25 18:05:47 -08:00
Alex Vandiver 173d2dec3d puppet: Check in defensive restart-camo cron job.
This was found on lb1; add it to the camo install on smokescreen.
2021-02-24 16:42:21 -08:00
Alex Vandiver d15e6990e5 puppet: Only execute setup-apt-repo if necessary.
This means that in steady-state, `zulip-puppet-apply` is expected to
produce no changes or commands to execute.  The verification step of
`setup-apt-repo` is quite fast, so this cleans up the output for very
little cost.
2021-02-23 18:16:02 -08:00
Alex Vandiver 0b736ef4cf puppet: Remove puppet_ops configuration for separate loadbalancer host. 2021-02-22 16:05:13 -08:00
Alex Vandiver e30b524896 iptables: Limit smokescreen port 4750, add camo port.
Limit incoming connections to port 4750 to only the smokescreen host,
and also allow access to the Camo server on that host, on port 9292.
2021-02-17 13:52:38 -08:00
Alex Vandiver 1caff01463 puppet: Configure nginx for long keep-alives when behind a loadbalancer.
These optimizations only makes sense when all connections at a TCP
level are coming from the same host or set of hosts; as such, they
are only enabled if `loadbalancer.ips` is set in the `zulip.conf`.
2021-02-17 10:25:33 -08:00
Alex Vandiver a88af1b5a2 camo: Install on smokescreen host. 2021-02-16 08:12:31 -08:00
Alex Vandiver 29f60bad20 smokescreen: Put the version into the supervisorctl command.
This makes it reload correctly if the version is changed.
2021-02-16 08:12:31 -08:00
Anders Kaseorg 6e4c3e41dc python: Normalize quotes with Black.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
2021-02-12 13:11:19 -08:00
Anders Kaseorg 11741543da python: Reformat with Black, except quotes.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
2021-02-12 13:11:19 -08:00
Anders Kaseorg 5028c081cb python: Merge concatenated string literals that Black would uglify.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
2021-02-12 13:11:19 -08:00
Alex Vandiver 559cdf7317 puppet: Set APT::Periodic::Unattended-Upgrade in apt config.
This is required for unattended upgrades to actually run regularly.
In some distributions, it may be found in 20auto-upgrades, but placing
it here makes it more discoverable.
2021-02-12 08:59:19 -08:00
Ganesh Pawar 65e23dd713 puppet: Add Zulip specific postgresql configuration for 13.
Based on the work done in a03e4784c7.
2021-02-05 09:30:34 -08:00
Ganesh Pawar 90a3dc8a91 puppet: Add upstream version of postgresql 13 config.
This is a prep commit to add provision support for Ubuntu 20.10 Groovy.
2021-02-05 09:30:34 -08:00
Tim Abbott fd8504e06b munin: Update to use NAGIOS_BOT_HOST.
We haven't actively used this plugin in years, and so it was never
converted from the 2014-era monitoring to detect the hostname.

This seems worth fixing since we may want to migrate this logic to a
more modern monitoring system, and it's helpful to have it correct.
2021-01-27 12:07:09 -08:00
Alex Vandiver ab035f76de puppet: Be more restrictive about mm addresses.
These will always have only 32 characters after the `mm`.
2021-01-26 10:13:58 -08:00
Alex Vandiver a53092687e puppet: Only match incoming gateway address on our mail domain.
79931051bd allows outgoing emails from
localhost, but outgoing recipients are still subjected to virtualmaps.
This caused all outgoing email from Zulip with destination addresses
containing `.`, `+`, or starting with `mm`, to be redirected back
through the email gateway.

Bracket the virualmap addresses used for local delivery to the mail
gateway with a restriction on the domain matching the
`postfix.mailname` configuration, regex-escaped, so those only apply
to email destined for that domain.

The hostname is _not_ moved from `mydestination` to
`virtual_alias_domains`, as that would preclude delivery to
actually-local addresses, like `postmaster@`.
2021-01-26 10:13:58 -08:00
Alex Vandiver c2526844e9 worker: Remove SignupWorker and friends.
ZULIP_FRIENDS_LIST_ID and MAILCHIMP_API_KEY are not currently used in
production.

This removes the unused 'signups' queue and worker.
2021-01-17 11:16:35 -08:00
Tim Abbott 4ee58f408b process_fts_updates: Make normal development startup silent.
We run this tool at DEBUG log level in production, so we will still
see the notice on startup there; this avoids a spammy line in the
development environment output..
2020-12-20 12:19:49 -08:00
Sutou Kouhei 0d3f9fc855 install: Use PGroonga packages built for PostgreSQL packages by PGDG
Because we always use PostgreSQL packages by PGDG since Zulip 3.0.

Fixes #16058.
2020-12-18 15:38:21 -08:00
Alex Vandiver 4868a4fe48 puppet: Set a long timeout on wal-g wal-push, to prevent stalls.
`wal-g wal-push` has a known bug with occasionally hanging after file
upload to S3[1]; set a rather long timeout on the upload process, so
that we don't simply stall forever when archiving WAL segments.

[1] https://github.com/wal-g/wal-g/issues/656
2020-11-20 11:32:36 -08:00
Sourabh Rana 419f163906 nginx: Increase file upload size from 25mb to 80mb. 2020-11-19 00:49:49 -08:00
Alex Vandiver 90ca06d873 puppet: Allow unattended upgrades of -updates in addition to -security.
This ensures that software will be fully up-to-date, not just with
security patches.
2020-11-13 16:45:05 -08:00
Alex Vandiver 2e20ab1658 puppet: Log the "Host" header and total response time.
Logging `Host` is useful for determining access patterns to realms,
especially if ROOT_DOMAIN_LANDING_PAGE is set.  Total response time is
useful in debugging access and performance patterns.
2020-11-13 16:42:32 -08:00
Tim Abbott 494a685827 puppet: Fix typo in name of missedmessage_emails consumer.
This has been present since this check was introduced in
45c9c3cc30.
2020-10-29 12:28:54 -07:00
Tim Abbott ab3cb2b3bf puppet: Fix internal redis puppet configuration.
The inherits rule is required for overriding existing configuration
files; while the `::profile` piece was missed in the recent ::profile
migration.
2020-10-29 11:53:43 -07:00
Alex Vandiver 6b9d7000b5 puppet: Set proxy environment variables.
These are respected by `urllib`, and thus also `requests`.  We set
`HTTP_proxy`, not `HTTP_PROXY`, because the latter is ignored in
situations which might be running under CGI -- in such cases it may be
coming from the `Proxy:` header in the request.
2020-10-28 12:17:35 -07:00
Alex Vandiver 8b0f32ee07 puppet: Move environment-setting into configuration, not command. 2020-10-28 12:13:04 -07:00
Alex Vandiver b9797770d3 provision: Rename backup directory to postgresql. 2020-10-28 11:57:03 -07:00
Alex Vandiver 1f7132f50d docs: Standardize on PostgreSQL, not Postgres. 2020-10-28 11:55:16 -07:00
Alex Vandiver eaa99359b1 puppet: Rename to check_postgresql_replication_lag. 2020-10-28 11:51:52 -07:00
Alex Vandiver 53e59a0a13 puppet: Rename check_postgres_backup to check_postgresql_backup. 2020-10-28 11:51:52 -07:00
Alex Vandiver 45f6c79c4a puppet: Rename postgres_ variables to postgresql_. 2020-10-28 11:51:52 -07:00
Alex Vandiver e124324050 puppet: Rename postgres_appdb in nagios to postgresql. 2020-10-28 11:51:52 -07:00
Alex Vandiver a155430eb5 docs: Document all zulip.conf settings.
This provides a single reference point for all zulip.conf settings;
these mostly link out to the more complete documentation about each
setting, elsewhere.

Fixes #12490.
2020-10-27 13:31:57 -07:00
Alex Vandiver e81bc19e45 puppet: Remove shims for old classes, except dockervoyager.
The upgrade mechanism in the previous commit negates the need for
them -- with the exception of dockervoyager.
2020-10-27 13:29:19 -07:00
Alex Vandiver d24c571bab puppet: Automatically back up the database if we have the secrets.
This avoids folks having to manually add to the puppet_classes.
2020-10-27 13:29:19 -07:00
Alex Vandiver e7798d2797 puppet: Move zulip_ops::profile::postgres_appdb to postgresql. 2020-10-27 13:29:19 -07:00
Alex Vandiver 9f25389bff puppet: Move top-level zulip_ops deployments to zulip_ops::profile. 2020-10-27 13:29:19 -07:00
Alex Vandiver 5365af544a puppet: Rename zulip::profile::rabbit to ::rabbitmq. 2020-10-27 13:29:19 -07:00
Alex Vandiver 188af57296 puppet: Rename postgres_appdb to postgresql.
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.
2020-10-27 13:29:19 -07:00
Alex Vandiver 91cb0988e1 puppet: Generalize docker detection.
This also has the benefit of detecting zulip::dockervoyager as well as
zulip::profile::docker.
2020-10-27 13:29:19 -07:00
Alex Vandiver 0f25acc7b3 puppet: Rename "voyager"/"dockervoyager" to "standalone"/"docker".
The "voyager" name is non-intuitive and not significant.
`zulip::voyager` and `zulip::dockervoyager` stubs are kept for
back-compatibility with existing `zulip.conf` files.
2020-10-27 13:29:19 -07:00
Alex Vandiver c2185a81d6 puppet: Move top-level zulip deployments into "profile" directory.
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
2020-10-27 13:29:19 -07:00
Alex Vandiver 27cfb14d92 puppet: Only include zulip::base for top-level deploys.
This also removes direct includes of `zulip::common`, making
`zulip::base` gatekeep the inclusion of it.  This helps enforce that
any top-level deploy only needs include a single class, and that any
configuration which is not meant to be deployed by itself will not
apply, due to lack of `zulip::common` include.

The following commit will better differentiate these top-level deploys
by moving them into a subdirectory.
2020-10-27 13:29:19 -07:00
Alex Vandiver 34e8c2c61e puppet: Move total_memory_mb from zulip::base into zulip::common.
This makes `zulip::common` used only for variable-setting, and
`zulip::base` used only for resource creation.
2020-10-27 13:29:19 -07:00
Alex Vandiver 7bb888c2ec puppet: Template supervisor.conf for redhat paths. 2020-10-27 13:29:19 -07:00
Alex Vandiver 3ab9b31d2f puppet: Purge all un-managed supervisor configuration files.
Relying on `defined(Class['...'])` makes the class sensitive to
resource evaluation ordering, and thus brittle.  It is also only
functional for a single service (thumbor).

Generalize by using `purge => true` for the directory to automatically
remove all un-managed files.  This is more general than the previous
form, and may result in additional not-managed services being removed.
2020-10-27 13:29:19 -07:00
Alex Vandiver 1d54630b4e log: Rename email-deliverer.log to match other files. 2020-10-25 14:56:37 -07:00
Alex Vandiver 93d661d119 puppet: Configure logrotate for all logger files.
This adds log rotation to all /var/log/zulip files.
2020-10-25 14:56:37 -07:00
Alex Vandiver c296b5d819 puppet: Allow unattended-upgrades for all but servers.
Restarting servers is what can cause service interruptions, and
increase risk.  Add all of the servers that we use to the list of
ignored packages, and uncomment the default allowed-origins in order
to enable unattended upgrades.
2020-10-23 16:46:06 -07:00
Anders Kaseorg 72d6ff3c3b docs: Fix more capitalization issues.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-10-23 11:46:55 -07:00
Alex Vandiver a7d1fd9ffb puppet: Remove non-working apt::source.
d2aa81858c replaced the `apt::source` to set up debathena with
`Exec['setup-apt-repo-debathena']`, but mistakenly left the
`apt::source` in place in `zmirror` (but not `zmirror_personals`).
The `apt::source` resource type was later removed in c9d54f7854,
making the manifest to apply on `zmirror`.

Remove the broken and unnecessary `apt::source` resource.
2020-10-23 11:31:20 -07:00
Alex Vandiver 48e06c25ba puppet: Switch nagios SSH checks to id_ed25519 key.
The ssh-rsa algorithm was deprecated[1] in OpenSSH 8.2 (2020-02-14) and
will be removed in a future release.

[1] https://www.openssh.com/txt/release-8.4
2020-10-22 16:42:30 -07:00
Alex Vandiver 0ea20bd7d8 puppet: Move postgres_version into postgres_common.
This property is not related to the base zulip install; move it to
zulip::postgres_common, which is already used as a namespace for
various postgres variables.
2020-10-22 11:32:25 -07:00
Alex Vandiver 25e995b677 puppet: Move normal_queues to the one place that uses it. 2020-10-22 11:32:25 -07:00
Alex Vandiver 423b5c2be2 puppet: Move queue error and stats directories to just the app host. 2020-10-22 11:31:05 -07:00
Alex Vandiver 4d4c21499a puppet: Move supervisor dependency into process_fts_updates.
PostgreSQL itself has no dependency on supervisor; rather, the FTS
updates do.
2020-10-22 11:30:53 -07:00
Alex Vandiver ca971ebc59 puppet: Remove empty zulip_ops class. 2020-10-22 11:30:53 -07:00
Alex Vandiver 16af05758d puppet: Move zulip_org into zulip_ops.
This class is not of general interest.
2020-10-22 11:30:53 -07:00
Alex Vandiver ad566c491d puppet: Drop now-unused zulip_ops:::git class. 2020-10-22 11:30:53 -07:00
Alex Vandiver 50e9e2ed20 puppet: Make zulip::base include zulip::apt_repository.
There was likely more dependency complexity prior to 97766102df, but
there is now no reason to require that consumers explicitly include
zulip::apt_repository.
2020-10-22 11:30:53 -07:00
Alex Vandiver 2dc6d26ec6 puppet: Fix included monitoring class name. 2020-10-19 22:30:20 -07:00
Alex Vandiver 7a1132d605 puppet: Switch golang and smokescreen to use /srv.
/srv and /opt have very similar usages; but we should be internally
consistent.

Move these two (the only usages of /opt) to match the rest in /srv.
2020-10-16 13:00:06 -07:00
Alex Vandiver 78b92a51cc puppet: Allow access to smokescreen port via iptables. 2020-10-15 15:18:35 -07:00
Alex Vandiver 0d5356969e puppet: Reformat ipv4 iptables rules comments. 2020-10-15 15:18:35 -07:00
Alex Vandiver fffea9612b puppet: Add an outgoing HTTP/HTTPS proxy server.
Use https://github.com/stripe/smokescreen to provide a server for an
outgoing proxy, run under supervisor.  This will allow centralized
blocking of internal metadata IPs, localhost, and so forth, as well as
providing default request timeouts (10s by default).
2020-10-15 15:18:35 -07:00
Anders Kaseorg dfaea9df65 shfmt: Reformat shell scripts with shfmt.
https://github.com/mvdan/sh

Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-10-15 15:16:00 -07:00
Alex Vandiver f61ac4a28d puppet: Move frontend monitoring into its own file.
This allows it to be pulled in for deploys like czo, which don't use
the full `zulip_ops::app_frontend`, but we wish to monitor.
2020-10-13 17:37:32 -07:00
Tim Abbott 7c2c82b190 nginx: Update nginx configuration for fhir/hl7 organization.
We should eventually add templating for the set of hosts here, but
it's worth merging this change to remove the deleted hostname and
replace it with the current one.
2020-10-13 16:50:26 -07:00
Anders Kaseorg 723d285e46 nginx: Redirect {www.,}zulipchat.com, www.zulip.com to zulip.com.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
2020-10-13 16:49:23 -07:00
Alex Vandiver c8df9a150e puppet: Drop all log2zulip configuration.
Disabled on webservers in 047817b6b0, it has since lingered in
configuration, as well as running (to no effect) every minute on the
loadbalancer.

Remove the vestiges of its configuration.
2020-10-13 11:00:50 -07:00
Alex Vandiver b431b1b021 puppet: Remove misleading motd.
This banner shows on lb1, advertising itself as lb0.  There is no
compelling reason for a custom motd, especially one which needs to
be reconfigured for each host.
2020-10-13 11:00:36 -07:00
Alex Vandiver 45c9c3cc30 queue: Monitor user_activity queue, now that it has a consumer.
Since this was using repead individual get() calls previously, it
could not be monitored for having a consumer.  Add it in, by marking
it of queue type "consumer" (the default), and adding Nagios lines for
it.

Also adjust missedmessage_emails to be monitored; it stopped using
LoopQueueProcessingWorker in 5cec566cb9, but was never added back
into the set of monitored consumers.
2020-10-11 14:19:42 -07:00
Alex Vandiver 4fd7df4e8c puppet: Remove absent of check-apns-tokens.
This was marked as ensure absent in d02101a401, in v1.7.0 in 2017.
2020-09-29 18:17:08 -07:00
Alex Vandiver 872a349508 puppet: Remove absent of log2zulip.
This was marked as ensure absent in 047817b6b0, in v2.0.0 in 2018.
2020-09-29 18:17:08 -07:00
Alex Vandiver 0137772fdb puppet: Remove absent of calculate-first-visible-message-id.
This was marked as ensure absent in dc7d44a245, in v1.9.0 in 2018.
2020-09-29 18:17:08 -07:00
Alex Vandiver 966c8dc23d puppet: Remove absent of email-mirror cron job.
This was marked as ensure absent in 24f8492236, in v1.3.0 in 2014.
2020-09-29 18:17:08 -07:00
Alex Vandiver 430d3b8554 puppet: Remove absent of libapache2-mod-wsgi.
This was marked as ensure absent in 89b97e7480, in v1.7.0 in 2017,
though it did not take effect until 6e55aa2ce6, in v1.9.0 in 2018.
2020-09-29 18:17:08 -07:00
Alex Vandiver 12085552d5 puppet: Tidy indentation. 2020-09-29 17:44:44 -07:00
Alex Vandiver 57d88eedd8 puppet: Only install rabbitmq cron jobs via zulip_ops.
The rabbitmq cron jobs exist in order to call rabbitmqctl as root and
write the output to files that nagios can consume, since nagios is not
allowed to run rabbitmqctl.

In systems which do not have nagios configured, these every-minute
cron jobs add non-insignificant load, to no effect.  Move their
installation into `zulip_ops`.  In doing so, also combine the cron.d
files into a single file; this allows us to `ensure => absent` the old
filenames, removing them from existing systems.  Leave the resulting
combined cron.d file in `zulip`, since it is still of general utility
and note.
2020-09-29 17:44:44 -07:00
Alex Vandiver 79931051bd puppet: Permit outgoing mail from postfix.
The configuration change made in 1c17583ad5 only allowed delivery to
those specific Zulip addresses.  However, they also prevent the
mailserver from being used as an outgoing email relay from Zulip,
since all mail that passed through the mailserver (from any
originator) was required to have a `RCPT TO` that matched those
regexes.

Allow mail originating from `mynetworks` to have an arbitrary
addresses in `RCPT TO`.
2020-09-25 15:09:27 -07:00
Alex Vandiver 36ea307fbf puppet: Depend other changes on sharding.py validation.
Use the validation of the tornado sharding config that
`stage_updated_sharding` does, by depending on it.  This ensures that
we don't write out a supervisor or nginx config based on a
bad (e.g. non-sequential) list of tornado ports.
2020-09-25 10:52:40 -07:00
Alex Vandiver c0e240277b tornado: Remove fingerprinting, write out .tmp files always.
Fingerprinting the config is somewhat brittle -- it requires either
custom bootstrapping for old (fingerprint-less) configs, and may have
false-positives.

Since generating the config is lightweight, do so into the .tmp files,
and compare the output to the originals to determine if there are
changes to apply.

In order to both surface errors, as well as notify the user in case a
restart is necessary, we must run it twice.  The `onlyif`
functionality cannot show configuration errors to the user, only
determine if the command runs or not.  We thus run the command once,
judging errors as "interesting" enough to run the actual command,
whose failure will be verbose in Puppet and halt any steps that depend
on it.

Removing the `onlyif` would result in `stage_updated_sharding` showing
up in the output of every Puppet run, which obscures the important
messages it displays when an update to sharding is necessary.
Removing the `command` (e.g. making it an `echo`) would result in
removing the ability to report configuration errors.  We thus have no
choice but to run it twice; this is thankfully low-overhead.
2020-09-25 10:52:40 -07:00