Like wih gitlab configs, this does only pure merge. We will
slaposify / adjust to updates in the following patches.

/cc @kazuhiko, @jerome

Slapos'ify config updates brought by sync with omnibus-gitlab (see merge
in the previous patch). Changes:

- default visibility levels gone away (see merge commit and
  https://gitlab.com/gitlab-org/omnibus-gitlab/commit/b5ebbab3 )

- there are new settings for GitLab Pages and Elasticsearch, which are EE
  only and thus we do not support them.

- there are new settings for auxiliary cron-like jobs, which we do not
  support for now, since they are used either for CI (not supported by
  us) or EE features.

Configuration files that were synced, but did not changed are also
marked as updated, so it is easier to track their changes to upstream in
the future.

/cc @kazuhiko, @jerome

This does only pure merge. We will slaposify / adjust config and
corresponding md5sum in the following patches.

/cc @kazuhiko, @jerome

Like 61544d87 - pristine copy from omnibus 8.4.4+ce.0-0-g1680742.

Most of http handling is moving to gitlab-workhorse. Nginx remains only
as ssl terminator.

/cc @kazuhiko, @jerome

Like 6fd7b987 - pristine copy from omnibus 8.4.4+ce.0-0-g1680742.

The only change is in

    gitlab.yml

The following files stay the same:

    database.yml.erb
    gitlab-rails-config.ru.erb
    gitlab-shell-config.yml.erb
    rack_attack.rb.erb
    resque.yml.erb
    smtp_settings.rb.erb
    unicorn.rb.erb

/cc @kazuhiko, @jerome

Update GitLab software to

    - gitlab-ce 8.4 + NXD patches

      https://lab.nexedi.com/kirr/gitlab-ce/commits/8-4-nxd

    - gitlab-shell to 2.6.10 which now is pure upstream, as all NXD
      patches were merged.

    - gitlab-workhorse 0.6.X + NXD patches.

      https://lab.nexedi.com/kirr/gitlab-workhorse/commits/y/blobraw-3
      https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/17

This only updates software and begins SR update to 8.4 - for now gitlab
instance becomes non-working -- we'll pull in configuration files
updates and fixups in the following patches.

/cc @kazuhiko, @jerome

slapos.recipe.cmmi executes command lines by line, so this build options
were ignored.

  older versions are failing on ARM arch.

version up : OpenBLAS 0.2.15. First try with auto-detected target and if it fails try TARGET=GENERIC.

You can also spcify the target explicitly by build-ext-options.

reviewd-by @Tyagov (on nexedi/slapos!42).

This patch series teaches ERP5 software release to automatically instantiate
Jupyter notebook web UI and tune it to connect to ERP5 by default. When Jupyter
is enabled, it also installs on-server erp5_data_notebook bt5 (see
nexedi/erp5!29 and nexedi/erp5@f662b5a2) which handles code execution requested
for Jupyter.

For ERP5 - for security and backward compatibility reasons - Jupyter
instantiation and erp5_data_notebook bt5 install happen only if jupyter is
explicitly enabled in instance parameters. The default is not to have Jupyter
out of the box.

On the other hand for Wendelin SR, which inherits from ERP5 SR, the
default is to have Jupyter out of the box, because Wendelin SR is fresh
enough without lots of backward compatibility needs, and Jupyter is
usually very handy for people who use Wendelin.

--------

NOTE Currently erp5-data-notebook bt5 has the following limitations (see
details on nexedi/slapos!43 and nexedi/erp5!29):

- errors are not reported properly to users;
- state is not fully saved to ZODB.

the latter point means notebook works only if it is connected to Zope family
with only 1 zope process. Hopefully this will be resolved some day.

Technical overview about how the integration is done itself on slapos part and
other notes are in 0a446263.

/proposed-for-review-on nexedi/slapos!43

Query strings used on GET requests have size limitations
on servers and this causes big code cells to not be executed
at all, returning only an Internal Server Error with no
further explanation.

/reviewed-by @kirr, @Tyagov (on nexedi/slapos!43)

Pandas and scikit-learn are handy to have for data processing which we
are going to do more and more in ERP5 context. Matplotlib is very handy
to have when one works with Jupyter, but also can be used by just
backend code to generate graphs.

From this point of view it makes sense to have this eggs always
available out of the box. To do so move them from Wendelin to ERP5.

/suggested-by @tiwariayush
/reviewed-by @Tyagov (on nexedi/slapos!43)

This patch teaches ERP5 software release to automatically instantiate Jupyter
notebook web UI and tune it to connect to ERP5 by default. When Jupyter is
enabled, it also installs on-server erp5_data_notebook bt5 (nexedi/erp5!29)
which handles code execution requested for Jupyter.

For ERP5 - for security and backward compatibility reasons - Jupyter
instantiation and erp5_data_notebook bt5 install happen only if jupyter is
explicitly enabled in instance parameters. The default is not to have Jupyter
out of the box.

On the other hand for Wendelin SR, which inherits from ERP5 SR, the
default is to have Jupyter out of the box, because Wendelin SR is fresh
enough without lots of backward compatibility needs, and Jupyter is
usually very handy for people who use Wendelin.

~~~~

For integration, we reuse already established in ERP5 infrastructure, to
request various slave instances, and request Jupyter in a way so it
automatically tunes and connects to balancer of one of Zope family.

Jupyter code itself is compiled by reusing
software/ipython_notebook/software.cfg, and Jupyter instance code is
reused by hooking software/ipython_notebook/instance.cfg.in into ERP5 SR
properly (the idea to override instance-jupyter not to render into
default template.cfg is taken from previous work by @tiwariayush).

~~~~

I tested this patch inside webrunner with create-erp5-site software type and
various configurations (whether to have or not have jupyter, to which zope
family to connect it, etc).

I have not tested frontend instantiation fully - because tests were done only
in webrunner, but I've tried to make sure generated buildout code is valid for
cases with frontend.

NOTE the code in this patch depends erp5_data_notebook bt5 (nexedi/erp5!29) which just got merged to erp5.git recently (see nexedi/erp5@f662b5a2)

NOTE even when erp5_data_notebook bt5 is installed, on a freshly installed ERP5, it
is required to "check site consistency" first, so that initial bt5(s) are
actually installed and erp5 is ready to function.

/cc @vpelletier, @Tyagov, @klaus, @Camata, @tiwariayush, @Kreisel, @jerome, @nexedi
/proposed-for-review-on nexedi/slapos!43

Gitlab uses github-markup to render various text-based markups
(markdown, rst, ...) into html. For rst github-markup wants to run
python and have docutils egg available:

    https://github.com/github/markup/blob/5393ae93/lib/github/markups.rb#L36

as we were not having docutils installed and path to proper python
interpreter setup, rst documents were not automatically rendered and
were show just as plain text.

We do a lot of documents in rst - that case is important for us.

So fix it by providing gitlab with properly setup python interpreter
with all needed eggs installed.

/cc @kazuhiko, @jerome
/proposed-for-review-on nexedi/slapos!39

The reason is: we are going to integrate Jupyter into ERP5 SR, and in
ERP5 SR code, there is already established infrastructure, which
requests slave instances. That infrastructure passes parameters in
serialized (= json) form, that's why we need to switch.

On the other hand, slapos.cookbook:slapconfiguration.serialised handles
non-json instance parameters as well: when there parameters format is
not

    {'_' -> <json>}

it decodes them as slapos.cookbook:slapconfiguration would do:

    https://lab.nexedi.com/nexedi/slapos/blob/69229988/slapos/recipe/slapconfiguration.py#L232
    https://lab.nexedi.com/nexedi/slapos/blob/69229988/slapos/recipe/librecipe/__init__.py#L51

So from this point of view, though we don't really need it here (Jupyter
SR is relatively new), we are staying backward compatible.

/cc @tiwariayush

Both numpy and ipython are included in ERP5 SR which wendelin inherits
from, and are pinned there. Here are e.g. latest pin-ups for numpy and
ipython in erp5:

    e3144a8a    (version up eggs.)
    135570c9    (version up eggs.)

Furthermore: this is not only a cleanup. As e3144a8a shows current
version of numpy in erp5 is 1.10.4 and in wendelin we still have 1.9.2
which is unintentional downgrade compared to erp5.

Don't do that.

/cc @kazuhiko
/reviewed-by @Tyagov  (on nexedi/slapos!41)

@rafael added this in 971d0bb7 (erp5: Make possible extent the list of
initial business templates to install), but we dropped that change while
merging erp5-cluster to master - see:

    6bbb61a8 "Merge branch 'master' into erp5-cluster", and
    e84d5e83 "Merge branch 'erp5-cluster'"

6bbb61a8 claimed that it

    Dropped commit 971d0bb7
    ("erp5: Make possible extent the list of initial business templates to install").

but it actually dropped changes only under stack/erp5/ , not software/wendelin/

Fix it.

/cc @rafael, @jm, @Tyagov
/reviewed-by TrustMe

In slapos.package.git/obs, we need to build binaries for specific paths,
without changing where buildout actually install them.

Hello up there,

Here comes SlapOS port of GitLab. We start from GitLab 8.2.X as that is what we
currently run on KVM on lab.nexedi.com, so that our data can be
straightforwardly migrated.

The SR compiles all needed software and organized all (sub-)services in one
partition and interconnects them with unix sockets for security and speed
reasons (see patch "gitlab: Make a plan to base instance layout on
gitlab-omnibus and to interconnect all internal services").

Services configuration files are originally taken from omnibus-gitlab
"distribution" and incrementally ported to slapos variant. This way we
establish a (imho) good path on how to track upstream changes and minimize our
delta & effort supporting it.

GitLab itself is patched (above patches that were already applied by upstream):

  - to support HTTP(S) only
  - to show site's ICP number
  - to speedup raw blob downloading ~ 17x times
    ( see patch "gitlab: Optimize raw blob downloading" for details and
      https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/17 )

Overall it should work and we should finally be able to migrate slapos.git
(because of raw blob downloading is not slow now) to GitLab and all other
Nexedi git repositories.

Thanks,
Kirill

P.S.

Somewhat outdated, but this picture on GitLab architecture might help to
understand how parts are glued together:

https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/architecture.md

P.P.S.

Native resiliency is not implemented yet, but we should be able to use gitlab
inside resilient webrunner already.

/proposed-for-review-on nexedi/slapos!39
/partly-reviewed-by @kazuhiko, @jerome, @Yanni, @jp
/cc @rafael, @jm

We've reached a state where first gitlab SR version should work. So as
promised let's freeze the md5 checksums.

All later patches should update corresponding md5 info when they change
a file.

/cc @kazuhiko, @jerome

In slapos we do a lot of automated software rebuild constantly, and thus
there is constant flow of requests to get raw blobs from git service,
e.g. like this

    https://lab.nexedi.com/nexedi/slapos/raw/master/software/wendelin/software.cfg

A lot of requests comes to slapos.git repository and currently gitlab,
out of the box, cannot keep up with that load.

I've prepared patches to offload raw blobs download requests handling
from unicorn (ruby) to gitlab-workhorse (go), and that resulted in ~ 17x
speedup - e.g. previously our std shuttle can handle ~ 70 raw-blob
requests/s and with my changes it is now ~ 1200 requests/s.

The patches were sent upstream

    https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/17

and we discussed with GitLab people and made a plan how to proceed
incrementally. It will probably take some time for gitlab team to fully
accept the approach though.

For now we can use our gitlab-workhorse fork. The patches itself are:

    kirr/gitlab-workhorse@1b274d0d
    kirr/gitlab-workhorse@2beb8c95

/cc @kazuhiko, @jerome, @jm

GitLab Nexedi Edition is currently upstream 8.2.X + the following
patches:

    - HTTP(S) is made to be default clone protocol

        kirr/gitlab-ce@5c1f2fb3

      and SSH info is completely removed from UI

        kirr/gitlab-ce@dfe9fb16
        kirr/gitlab-ce@f3f84743

      so essentially the only way to access a repository is via HTTP(S).

    - Rake check tasks are adjusted to exit with non-zero code if there
      is a failure

        kirr/gitlab-ce@a93ae418

      We need this for promises to work correctly with failures being
      detected, not silently skipped. The patch was sent upstream:

        https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/1885

    - GitLab supports setting up site's ICP License in gitlab.yml and
      shows it in appropriate places together with info about GitLab
      itself:

        kirr/gitlab-ce@e7e0fd88
        kirr/gitlab-ce@79c127e6

    + other cosmetic/minor changes.

More patches will probably come (e.g. apply a single patch from a
merge-request with `git am` without creating merge commit for just 1
patch, etc) but for now that's all.

NOTE ICP is non-ascii text with hieroglyphs. slapos.core was taught to
    be able to pass parameters with non-ascii values to instance:

        nexedi/slapos.core@347d33d6

    That patch is included in slapos.core 1.3.15, but as we currently
    have a lot of older slapos.core deployed (e.g. 1.3.5 on my
    development webrunner) a workaround is (hopefully temporarily) used
    to pass non-ascii values as URL-encoded strings.

/cc @kazuhiko, @jerome, @rafael

Like with Rails configuration this first step is pristine import of
nginx configuration files from omnibus-gitlab. All files were imported
as-is in their ERB form and filenames from omnibus-gitlab
8.2.3+ce.0-0-g8eda093 from here:

    https://gitlab.com/gitlab-org/omnibus-gitlab/tree/8eda093/files/gitlab-cookbooks/gitlab/templates/default

We import only nginx main http configuration - nginx's CI and Mattermost
configurations are not imported, as we do not support CI and Mattermost (yet ?).

As with Rails configuration files, we will convert the templates to
jinja2 and adjust them to slapos version in the following patches.  We
will also use the same (commit from last-erb-mod commit + merge)
approach to track upstream changes.

/cc @kazuhiko, @jerome

In the previous patch we setup nginx service which listens to the world
and as such gitlab service becomes to be ready to used - so publish
backend URL.

NOTE we'll need to optimise and tweak gitlab a bit further in upcoming
    patches, so it can be really used under load and with our use-cases,
    but even now it listens to http ok and generally works.

/cc @kazuhiko, @jerome

Sidekiq[1] is used in GitLab as background jobs manager - i.e. if a
request handler needs to spawn some non-light job - it adds it to
sidekiq queue (in Redis) and relies on sidekiq service to later pick
this job up and execute it.

The service is setup with just to run bin/gitlab-sidekiq with
appropriate queues (extracted from omnibus-gitlab) and appropriate
settings to controlling GitLab's sidekiq Out-Of-Memory killer[2].

NOTE Unlike unicorn OOM killer, Sidekiq memory killer just makes sidekiq
    processes to be SIGKILL terminated and relies on managing service to
    restart it. In slapos we don't have mechanism to set autorestart=true,
    nor bang/watchdog currently work with slapproxy, so we setup to do
    such monitoring ourselves manually with here-introduced
    watcher-sigkill program.

NOTE2 sidekiq promise, because it is rake/gitlab based, is slow to
    load/run and thus is put into etc/promise.slow/

[1] http://sidekiq.org/
[2] https://gitlab.com/gitlab-org/gitlab-ce/blob/1322bd78/doc/operations/sidekiq_memory_killer.md

/cc @kazuhiko, @jerome

Go through nginx configuration templates and convert them to jinja2 with
slapos parameters (reminder: names and default values are imported from
omnibus-gitlab 8.2.3+ce.0-0-g8eda093), except commenting out features we
do not want to support (yet ?).

As nginx is a reverse-proxy, i.e. it integrates all internal services
and works as frontend to them, our gitlab service is now ready to listen
and talk to the world over (standard to slapos services backend) IPv6.

Nginx also acts as SSL termination point - for it to work by default we
setup self-signed certificate for the backend, which can be manually
changed to proper certificate if needed. Backend certificate is used
if gitlab is configured to work in HTTPS mode (and frontend certificate
is another story).

NOTE ssl certificate is generated with just `openssl req ...` - yes, there
    is slapos.cookbook:certificate_authority.request but it requires
    to start whole service and has up to 60 seconds latency to generate
    certificate. And we only need to run 1 command to do that...

The features disabled are:

    - http -> https redirection

      not needed for us at nginx level - the frontend can do the
      redirection and also gitlab speaks HSTS on https port so when we access
      https port via http protocol, it gets redirected to https.

    - kerberos
    - ssl_dhparam
    - providing custom nginx configuration via instance parameter

/cc @kazuhiko, @jerome

As was described in the previous patch, we need $HOME to be propagated
by this programs so that git can find partition's .gitconfig.

Specifically we need the following patches to be present in our build:

    https://gitlab.com/gitlab-org/gitlab-shell/commit/9e087f64
    https://gitlab.com/gitlab-org/gitlab-workhorse/commit/b5f1b803

They both have been applied upstream very close to revisions we
previously had in software.cfg, so we only need to update the revisions
to get them.

/cc @kazuhiko, @jerome