navsection: installguide
title: Install the Git server
...
+{% comment %}
+Copyright (C) The Arvados Authors. All rights reserved.
+
+SPDX-License-Identifier: CC-BY-SA-3.0
+{% endcomment %}
Arvados allows users to create their own private and public git repositories, and clone/push them using SSH and HTTPS.
Here, we show how to install the git hosting services *on the same host as your API server.* Using a different host is not yet fully supported. On this page we will refer to it as your git server.
{% include 'notebox_end' %}
-DNS and network configuration should be set up so port 443 reaches your HTTPS proxy, and port 22 reaches your git server.
+DNS and network configuration should be set up so port 443 reaches your HTTPS proxy, and port 22 reaches the OpenSSH service on your git server.
h2. Generate an API token
-On the API server, if you are using RVM:
-
-<notextile>
-<pre><code>gitserver:~$ <span class="userinput">cd /var/www/arvados-api/current</span>
-gitserver:/var/www/arvados-api/current$ <span class="userinput">sudo -u www-data RAILS_ENV=production `which rvm-exec` default bundle exec ./script/create_superuser_token.rb</span>
-zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
-</code></pre>
-</notextile>
-
-If you are not using RVM:
-
-<notextile>
-<pre><code>gitserver:~$ <span class="userinput">cd /var/www/arvados-api/current</span>
-gitserver:/var/www/arvados-api/current$ <span class="userinput">sudo -u www-data RAILS_ENV=production bundle exec ./script/create_superuser_token.rb</span>
-zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
-</code></pre>
-</notextile>
+{% assign railshost = "gitserver" %}
+{% assign railscmd = "bundle exec ./script/create_superuser_token.rb" %}
+{% assign railsout = "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz" %}
+Use the following command to generate an API token. {% include 'install_rails_command' %}
Copy that token; you'll need it in a minute.
</code></pre>
</notextile>
+{% include 'install_git' %}
+
h2. Create a "git" user and a storage directory
-Hosted repositories will be stored under @/var/lib/arvados/git/@. If you choose a different location, make sure to update the @git_repositories_dir@ entry in your API server's @config/application.yml@ file, preserving the trailing @repositories/@ part.
+Gitolite and some additional scripts will be installed in @/var/lib/arvados/git@, which means hosted repository data will be stored in @/var/lib/arvados/git/repositories@. If you choose to install gitolite in a different location, make sure to update the @git_repositories_dir@ entry in your API server's @application.yml@ file accordingly: for example, if you install gitolite at @/data/gitolite@ then your @git_repositories_dir@ will be @/data/gitolite/repositories@.
A new UNIX account called "git" will own the files. This makes git URLs look familiar to users (<code>git@[...]:username/reponame.git</code>).
</code></pre>
</notextile>
-The git user needs its own SSH key. (It must be able to run @ssh git@localhost@ from scripts.)
+The git user needs its own SSH key. (It must be able to run <code>ssh git@localhost</code> from scripts.)
<notextile>
<pre><code>gitserver:~$ <span class="userinput">sudo -u git -i bash</span>
h2. Install gitolite
-Check https://github.com/sitaramc/gitolite/tags for the latest stable version (_e.g.,_ @v3.6.3@).
+Check "https://github.com/sitaramc/gitolite/tags":https://github.com/sitaramc/gitolite/tags for the latest stable version. This guide was tested with @v3.6.4@. _Versions below 3.0 are missing some features needed by Arvados, and should not be used._
Download and install the version you selected.
<notextile>
<pre><code>git@gitserver:~$ <span class="userinput">echo 'PATH=$HOME/bin:$PATH' >.profile</span>
git@gitserver:~$ <span class="userinput">source .profile</span>
-git@gitserver:~$ <span class="userinput">git clone --branch <b>v3.6.3</b> git://github.com/sitaramc/gitolite</span>
+git@gitserver:~$ <span class="userinput">git clone --branch <b>v3.6.4</b> https://github.com/sitaramc/gitolite</span>
...
Note: checking out '5d24ae666bfd2fa9093d67c840eb8d686992083f'.
...
</code></pre>
</notextile>
+_If this didn't go well, more detail about installing gitolite, and information about how it works, can be found on the "gitolite home page":http://gitolite.com/._
+
Clone the gitolite-admin repository. The arvados-git-sync.rb script works by editing the files in this working directory and pushing them to gitolite. Here we make sure "git push" won't produce any errors or warnings.
<notextile>
</code></pre>
</notextile>
-h2. Configure gitolite
+h3. Configure gitolite
Configure gitolite to look up a repository name like @username/reponame.git@ and find the appropriate bare repository storage directory.
</span></code></pre>
</notextile>
+Inside that section, adjust the 'UMASK' setting to @022@, to ensure the API server has permission to read repositories:
+
+<notextile>
+<pre><code> UMASK => <span class="userinput">022</span>,
+</code></pre>
+</notextile>
+
Uncomment the 'Alias' line in the section that begins @ENABLE => [@:
<notextile>
</code></pre>
</notextile>
-h2. Enable the synchronization script
+h3. Enable the synchronization script
-The API server package includes a script that retrieves the current set of repository names and permissions from the API, writes names and permissions to @arvadosaliases.pl@ in a format usable by gitolite, and creates new empty repositories if needed. This script should run every 2 to 5 minutes.
+The API server package includes a script that retrieves the current set of repository names and permissions from the API, writes them to @arvadosaliases.pl@ in a format usable by gitolite, and triggers gitolite hooks which create new empty repositories if needed. This script should run every 2 to 5 minutes.
If you are using RVM, create @/etc/cron.d/arvados-git-sync@ with the following content:
</code></pre>
</notextile>
+h3. Configure the API server to advertise the correct SSH URLs
+
+In your API server's @application.yml@ file, add the following entry:
+
+<notextile>
+<pre><code>git_repo_ssh_base: "git@git.<span class="userinput">uuid_prefix.your.domain</span>:"
+</code></pre>
+</notextile>
+
+Make sure to include the trailing colon.
+
h2. Install the arvados-git-httpd package
This is needed only for HTTPS access.
<notextile>
<pre><code>~$ <span class="userinput">sudo yum install git arvados-git-httpd</span>
+~$ <span class="userinput">sudo systemctl enable arvados-git-httpd</span>
</code></pre>
</notextile>
<notextile>
<pre><code>~$ <span class="userinput">arvados-git-httpd -h</span>
-Usage of arvados-git-httpd:
- -address="0.0.0.0:80": Address to listen on, "host:port".
- -git-command="/usr/bin/git": Path to git executable. Each authenticated request will execute this program with a single argument, "http-backend".
- -repo-root="/path/to/cwd": Path to git repositories.
+[...]
+Usage: arvados-git-httpd [-config path/to/arvados/git-httpd.yml]
+[...]
~$ <span class="userinput">git http-backend</span>
Status: 500 Internal Server Error
Expires: Fri, 01 Jan 1980 00:00:00 GMT
h3. Enable arvados-git-httpd
-Install "runit":http://smarden.org/runit/ (if it's not already installed) and configure it to run arvados-git-httpd. Update the API host to match your site.
+{% include 'notebox_begin' %}
+
+The arvados-git-httpd package includes configuration files for systemd. If you're using a different init system, you'll need to configure a service to start and stop an @arvados-git-httpd@ process as desired.
+
+{% include 'notebox_end' %}
+
+Create the configuration file @/etc/arvados/git-httpd/git-httpd.yml@. Run @arvados-git-httpd -h@ to learn more about configuration entries.
+
+<notextile>
+<pre><code>Client:
+ APIHost: <b>uuid_prefix.your.domain</b>
+ Insecure: false
+GitCommand: /var/lib/arvados/git/gitolite/src/gitolite-shell
+GitoliteHome: /var/lib/arvados/git
+Listen: :9001
+RepoRoot: /var/lib/arvados/git/repositories
+</code></pre>
+</notextile>
+
+Restart the systemd service to ensure the new configuration is used.
<notextile>
-<pre><code>~$ <span class="userinput">sudo apt-get install runit</span>
-~$ <span class="userinput">cd /etc/sv</span>
-/etc/sv$ <span class="userinput">sudo mkdir arvados-git-httpd; cd arvados-git-httpd</span>
-/etc/sv/arvados-git-httpd$ <span class="userinput">sudo mkdir log</span>
-/etc/sv/arvados-git-httpd$ <span class="userinput">sudo sh -c 'cat >log/run' <<'EOF'
-#!/bin/sh
-mkdir -p main
-chown git:git main
-exec chpst -u git:git svlogd -tt main
-EOF</span>
-/etc/sv/arvados-git-httpd$ <span class="userinput">sudo sh -c 'cat >run' <<'EOF'
-#!/bin/sh
-export ARVADOS_API_HOST=<b>uuid_prefix.your.domain</b>
-export GITOLITE_HTTP_HOME=/var/lib/arvados/git
-export PATH="$PATH:/var/lib/arvados/git/bin"
-exec chpst -u git:git arvados-git-httpd -address=:9001 -git-command="$(which git)" -repo-root=<b>/var/lib/arvados/git/repositories</b> 2>&1
-EOF</span>
-/etc/sv/arvados-git-httpd$ <span class="userinput">sudo chmod +x run log/run</span>
+<pre><code>~$ <span class="userinput">sudo systemctl restart arvados-git-httpd</span>
</code></pre>
</notextile>
This is best achieved by putting a reverse proxy with SSL support in front of arvados-git-httpd, running on port 443 and passing requests to @arvados-git-httpd@ on port 9001 (or whichever port you used in your run script).
+Add the following configuration to the @http@ section of your Nginx configuration:
+
<notextile>
-<pre><code><span class="userinput">http {
- upstream arvados-git-httpd {
- server localhost:9001;
- }
- server {
- listen *:443 ssl;
- server_name git.uuid_prefix.example.com;
- ssl_certificate /root/git.uuid_prefix.example.com.crt;
- ssl_certificate_key /root/git.uuid_prefix.example.com.key;
- location / {
- proxy_pass http://arvados-git-httpd;
- proxy_set_header X-Forwarded-For $remote_addr;
- }
+<pre><code>
+upstream arvados-git-httpd {
+ server 127.0.0.1:<span class="userinput">9001</span>;
+}
+server {
+ listen <span class="userinput">[your public IP address]</span>:443 ssl;
+ server_name git.<span class="userinput">uuid_prefix.your.domain</span>;
+ proxy_connect_timeout 90s;
+ proxy_read_timeout 300s;
+
+ ssl on;
+ ssl_certificate <span class="userinput">/YOUR/PATH/TO/cert.pem</span>;
+ ssl_certificate_key <span class="userinput">/YOUR/PATH/TO/cert.key</span>;
+
+ # The server needs to accept potentially large refpacks from push clients.
+ client_max_body_size 50m;
+
+ location / {
+ proxy_pass http://arvados-git-httpd;
}
}
-</span>
</code></pre>
</notextile>
-h3. Tell the API server about the arvados-git-httpd service
+h3. Configure the API server to advertise the correct HTTPS URLs
+
+In your API server's @application.yml@ file, add the following entry:
+
+<notextile>
+<pre><code>git_repo_https_base: https://git.<span class="userinput">uuid_prefix.your.domain</span>/
+</code></pre>
+</notextile>
+
+Make sure to include the trailing slash.
+
+h2. Restart Nginx
-In your API server's @config/application.yml@ file, add the following entry:
+Restart Nginx to make the Nginx and API server configuration changes take effect.
<notextile>
-<pre><code>git_http_base: git.<span class="userinput">uuid_prefix.your.domain</span>
+<pre><code>gitserver:~$ <span class="userinput">sudo nginx -s reload</span>
</code></pre>
</notextile>
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