Set up local development with Zoekt and Sourcegraph

$ git clone https://github.com/sourcegraph/sourcegraph
$ git clone https://github.com/sourcegraph/zoekt

To see your Zoekt changes reflected live on your local Sourcegraph instance, you'll have to modify your Sourcegraph go.mod file so that the Zoekt dependency is pointed to your local folder.

Change at the bottom:

replace (
    ...
    github.com/google/zoekt => <your zoekt repository directory>
    ...
)

This isn't hot reloaded so you might have to restart Sourcegraph on every Zoekt change. It may make sense to ensure your changes in Zoekt are working first before trying them out in Sourcegraph.

Install Ctags

Ctags is not required for Zoekt. However, we use ctags in production and tests on CI run with ctags enabled.

To install universal-ctags locally, follow the instructions under "how to build and install" with the following changes:

$ git clone https://github.com/universal-ctags/ctags.git
$ cd ctags
$ ./autogen.sh
- $ ./configure --prefix=/where/you/want # defaults to /usr/local
+ $ ./configure --program-prefix=universal- --prefix=/where/you/want --enable-json
$ make
$ make install # may require extra privileges depending on where to install

The installation will place the binaries in /where/you/want/bin/. Make sure the bin directory is on your $Path.

--program-prefix=universal- ensures that ctags will be picked up by Zoekt just like it would in production. Note that the binary name "universal-ctags" is treated differently in Zoekt. Setting the environment variable CTAGS_COMMAND=ctags might lead to different results because Zoekt won't use go-ctags.

On macOS, as BSD version of ctags is shipped as part of the XCode commandline developer tools. Using the BSD version for Zoekt is not supported.

Notes

Here are some commands you can run against Zoekt.

Setup

$ go install ./cmd/...
$ go install ./cmd/<specific command>

The components that Sourcegraph uses from Zoekt are zoekt-git-index, zoekt-sourcegraph-indexserver, and zoekt-webserver.

Usage

# start indexserver, pointing it to a local dir instead of to an instance of Sourcegraph
$ zoekt-sourcegraph-indexserver --sourcegraph_url <dir>

# start the web interface
$ zoekt-webserver

# index 1 repo
$ zoekt-git-index /path/to/repo

# search shards directly, without webserver
$ zoekt <query>

Check <cmd> --help for more information.

Misc

Index files are stored in:

• ~/.zoekt (Zoekt's default index dir)
• ~/.sourcegraph/zoekt/index-X (sourcegraph)

Local Sourcegraph Zoekt UI can be accesed at localhost:3070 and localhost:3071 (we have multiple instances because of horizontal scaling).