From e8d9230dcea32e2d08331ac88ec37a413bf6e4fc Mon Sep 17 00:00:00 2001
From: Ruoqing He <linuxwatcher@outlook.com>
Date: Fri, 26 Jan 2024 16:41:06 +0800
Subject: [PATCH] Add developer guide on Arch Linux

Modified `.env` to dictate users to set up `DB` related fields properly according to their actual setup.

Signed-off-by: Ruoqing He <linuxwatcher@outlook.com>
---
 .env      |  21 ++++----
 README.md | 140 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 149 insertions(+), 12 deletions(-)

diff --git a/.env b/.env
index 096ac9d1..05684d49 100644
--- a/.env
+++ b/.env
@@ -1,15 +1,17 @@
-## you should add the environment variable in .zshrc or other profile on production enviroment
-
-## Database connect and pool configuration
-MEGA_DB_POSTGRESQL_URL = "postgres://${PG_USERNAME}:${PG_SECRET}@${PG_HOST}/mega"
-MEGA_DB_MYSQL_URL = "mysql://${MYSQL_USERNAME}:${MYSQL_SECRET}@${MYSQL_HOST}/mega"
-
+# Fillin the following environment variables with values you set
+DB = "" # {postgres, mysql}
+DB_USERNAME = ""
+DB_PASSWORD = ""
+DB_HOST = ""
+
+MEGA_DB_POSTGRESQL_URL = "${DB}://${DB_USERNAME}:${DB_PASSWORD}@${DB_HOST}/mega"
+MEGA_DB_MYSQL_URL = "${DB}://${DB_USERNAME}:${DB_PASSWORD}@${DB_HOST}/mega"
 MEGA_DB_MAX_CONNECTIONS = 32
 MEGA_DB_MIN_CONNECTIONS = 16
 
-MEGA_DB_SQLX_LOGGING = false # Whether to enabling SQLx Log
+MEGA_DB_SQLX_LOGGING = false # Whether to disabling SQLx Log
 
-## Mega SSH key path 
+# Mega SSH key path 
 MEGA_SSH_KEY = "/tmp/.mega/ssh"
 
 ## file storage configuration
@@ -25,11 +27,10 @@ MEGA_BIG_OBJ_THRESHOLD_SIZE = 1024 # Unit KB. If the object file size exceeds th
 MEGA_INIT_DIRS = "projects,docs,third_parts" # init these repo directories in mega init command
 MEGA_IMPORT_DIRS = "third_parts" # Only import directory support multi-branch commit and tag, repo under regular directory only support main branch only
 
-## Objects decode configuration
 GIT_INTERNAL_DECODE_CACHE_SIZE = 1000 # Maximum number of git objects in LRU cache
 GIT_INTERNAL_DECODE_STORAGE_BATCH_SIZE = 10000 # The maximum number of git object in a "INSERT" SQL database operation
 GIT_INTERNAL_DECODE_STORAGE_TQUEUE_SIZE = 10 # The maximum number of parallel insertion threads in the database operation queue
-GIT_INTERNAL_DECODE_CACHE_TYEP = "lru" #{lru,redis}
+GIT_INTERNAL_DECODE_CACHE_TYEP = "lru" # {lru,redis}
 REDIS_CONFIG = "redis://127.0.0.1:6379"
 
 ## Bazel build configuration
diff --git a/README.md b/README.md
index 61a12668..8452eaa5 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,9 @@ Centralized systems, despite their convenience and popularity, are not without t
 
 To address these challenges, there's a growing need for a decentralized open-source collaboration model. Such a model would enhance the freedom of communication among developers and strengthen their ownership and control over their code. By moving away from centralized systems, developers can ensure that their contributions and the direction of their projects are not unduly influenced by the policies or stability of a single platform. This shift towards decentralization is not just a technical necessity but a step towards preserving the ethos of open-source: collaboration, freedom, and community-driven development.
 
-## Quick Started for developing and testing on MacOS
+## Quick Start for developing and testing
+
+### MacOS
 
 1. Install Rust on your MacOS machine.
 
@@ -150,6 +152,140 @@ To address these challenges, there's a growing need for a decentralized open-sou
    $ git clone http://localhost:8000/projects/mega.git
    ```
 
+### Arch Linux
+
+1. Install Rust.
+
+   ```bash
+   $ pacman -S rustup
+   $ rustup default stable
+   ```
+
+2. Clone mega repository and build.
+
+   ```bash
+   $ git clone https://github.com/web3infra-foundation/mega.git
+   $ cd mega
+   $ cargo build
+   ```
+
+3. Install PostgreSQL and initialize database.
+
+   1.  Install PostgreSQL.
+
+   ```bash
+   $ pacman -S postgresql
+   # Switch to `postgres` user
+   $ sudo -i -u postgres
+   postgres $ initdb -D /var/lib/postgres/data -E utf8 # /Volumes/Data is where data will be stored
+   postgres $ exit
+   $ systemctl enable --now postgresql
+   ```
+
+   2.  Create database.
+
+   ```bash
+   $ sudo -u postgres psql postgres
+   ```
+
+   ```sql
+   postgres=# \l
+   postgres=# DROP DATABASE IF EXISTS mega;
+   postgres=# CREATE DATABASE mega;
+   postgres=# \q
+   ```
+
+   3.  Import `mega/sql/postgres/pg_<time>_init.sql` to `mega`.
+
+   ```bash
+   $ cd mega/sql/postgres
+   $ psql mega < pg_<time>__init.sql
+   ```
+   
+   4. Craeate user and grant privileges.
+
+   ```sql
+   postgres=# DROP USER IF EXISTS mega;
+   postgres=# CREATE USER mega WITH ENCRYPTED PASSWORD 'rustgit';
+   postgres=# GRANT ALL PRIVILEGES ON DATABASE mega TO mega;
+   ```
+
+   ```bash
+   $ psql mega -c "GRANT ALL ON ALL TABLES IN SCHEMA public to mega;"
+   $ psql mega -c "GRANT ALL ON ALL SEQUENCES IN SCHEMA public to mega;"
+   $ psql mega -c "GRANT ALL ON ALL FUNCTIONS IN SCHEMA public to mega;"
+   ```
+
+4. Install redis.
+
+   ```bash
+   $ pacman -S redis
+   $ systemctl enable --now redis
+   ```
+
+5. Config `.env`.
+
+   ```ini
+   # If you followed the installation guide, you can use below URL directly, comment it the otherwise.
+   MEGA_DB_POSTGRESQL_URL = "postgres://mega:rustgit@127.0.0.1/mega"
+   # If you changed any of the username, password or host, you will need to uncomment the following line and replace the placeholders manually.
+   #MEGA_DB_POSTGRESQL_URL = "postgres://<username>:<password>@127.0.0.1/<db_name (or host)>"
+   MEGA_DB_MAX_CONNECTIONS = 32
+   MEGA_DB_MIN_CONNECTIONS = 16
+
+   MEGA_DB_SQLX_LOGGING = false # Whether to disabling SQLx Log
+
+   ## file storage configuration
+   MEGA_OBJ_STORAGR_TYPE = "LOCAL" # LOCAL or REMOTE
+   MEGA_OBJ_LOCAL_PATH = "/tmp/.mega" # This configuration is used to set the local path of the project storage
+
+   MEGA_BIG_OBJ_THRESHOLD_SIZE = 1024 # Unit KB. If the object file size exceeds the threshold value, it will be handled by file storage instead of the database.
+
+   ## Init directory configuration
+   MEGA_INIT_DIRS = "projects,docs,third_parts" # init these repo directories in mega init command
+   MEGA_IMPORT_DIRS = "third_parts" # Only import directory support multi-branch commit and tag, repo under regular directory only support main branch only
+
+
+   GIT_INTERNAL_DECODE_CACHE_SIZE = 100 # Maximum number of git objects in LRU cache
+   GIT_INTERNAL_DECODE_STORAGE_BATCH_SIZE = 1000 # The maximum number of git object in a "INSERT" SQL database operation
+   GIT_INTERNAL_DECODE_STORAGE_TQUEUE_SIZE = 1 # The maximum number of parallel insertion threads in the database operation queue
+   GIT_INTERNAL_DECODE_CACHE_TYEP = "redis" # {lru,redis}
+   REDIS_CONFIG = "redis://127.0.0.1:6379"
+
+   ## Bazel build config, you can use service like buildfarm to enable RBE(remote build execution)
+   # you can refer to https://bazelbuild.github.io/bazel-buildfarm/docs/quick_start/ for more details about remote executor
+   BAZEL_BUILD_ENABLE = false # leave true if you want to trigger bazel build in each push process
+   BAZEL_BUILDP_PATH = "/tmp/.mega/bazel_build_projects" # Specify a temporary directory to build the project with bazel
+   BAZEL_REMOTE_EXECUTOR = "grpc://localhost:8980" # If enable the remote executor, please fillin the remote executor address, or else leave empty if you want to build by localhost. 
+   BAZEL_GIT_CLONE_URL = "http://localhost:8000" # Tell bazel to clone the project from the specified git url
+   ```
+
+6. Init Mega.
+
+   ```bash
+   $ cd mega
+   $ cargo run init
+   ```
+
+7. Start Mega server.
+
+   ```bash
+   # Start a single https server
+   $ cargo run service https 
+   # Or Start multiple server
+   $ cargo run service start http ssh p2p
+   ```
+
+8. Test `git push` and `git clone`
+
+   ```bash
+   $ cd mega
+   $ git remote add local http://localhost:8000/projects/mega.git
+   $ git push local main
+   $ cd /tmp
+   $ git clone http://localhost:8000/projects/mega.git
+   ```
+
 ## Contributing
 
 The mega project relies on community contributions and aims to simplify getting started. To develop Mega, clone the repository, then install all dependencies and initialize the database schema, run the test suite and try it out locally. Pick an issue, make changes, and submit a pull request for community review.
@@ -161,4 +297,4 @@ More information on contributing to Mega is available in the [Contributing Guide
 Mega is licensed under this Licensed:
 
 - MIT LICENSE ( [LICENSE-MIT](LICENSE-MIT) or https://opensource.org/licenses/MIT)
-- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or https://www.apache.org/licenses/LICENSE-2.0)
\ No newline at end of file
+- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or https://www.apache.org/licenses/LICENSE-2.0)