[COMMIT osv-apps master] apps: add SeaweedFS example

[Commit Bot]

From: Waldemar Kozaczuk <jwkoz...@gmail.com>
Committer: Waldemar Kozaczuk <jwkoz...@gmail.com>
Branch: master

apps: add SeaweedFS example

Signed-off-by: Waldemar Kozaczuk <jwkoz...@gmail.com>

---
diff --git a/seaweedfs/.gitignore b/seaweedfs/.gitignore
--- a/seaweedfs/.gitignore
+++ b/seaweedfs/.gitignore
@@ -0,0 +1 @@
+usr.manifest
diff --git a/seaweedfs/GET b/seaweedfs/GET
--- a/seaweedfs/GET
+++ b/seaweedfs/GET
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+set -e
+
+VERSION=2.96
+
+rm -rf upstream
+
+mkdir upstream
+cd upstream
+git clone -b $VERSION --depth 1 https://github.com/chrislusf/seaweedfs.git
diff --git a/seaweedfs/Makefile b/seaweedfs/Makefile
--- a/seaweedfs/Makefile
+++ b/seaweedfs/Makefile
@@ -0,0 +1,17 @@
+.PHONY: module
+module: upstream/seaweedfs/weed/weed
+ echo '/weed: $${MODULE_DIR}/upstream/seaweedfs/weed/weed' > usr.manifest
+
+go_version=$(shell go version | grep -o 1.[0-9][0-9])
+go_version_new_enough=$(shell echo "$(go_version) >= 1.18" | bc)
+
+ifneq (1,$(go_version_new_enough))
+ $(error "Golang version needs to be at least 1.18")
+endif
+
+upstream/seaweedfs/weed/weed:
+ ./GET
+ cd upstream/seaweedfs/weed && go build -buildmode=pie -ldflags "-linkmode external"
+
+clean:
+ rm -rf ./upstream usr.manifest
diff --git a/seaweedfs/README.md b/seaweedfs/README.md
--- a/seaweedfs/README.md
+++ b/seaweedfs/README.md
@@ -0,0 +1,14 @@
+This is a example of [SeaweedFS](https://github.com/chrislusf/seaweedfs) golang app running on OSv.
+
+Here are the examples on how to build and run it:
+* master
+```
+./scripts/build image=seaweedfs
+./scripts/run.py --forward 'tcp::9333-:9333'
+```
+
+* server
+```
+./scripts/build image=seaweedfs.server
+./scripts/run.py --forward 'tcp::9333-:9333'
+```
diff --git a/seaweedfs/module.py b/seaweedfs/module.py
--- a/seaweedfs/module.py
+++ b/seaweedfs/module.py
@@ -0,0 +1,5 @@
+from osv.modules import api
+
+default = api.run(cmdline="/weed master -port 9333")
+server = api.run(cmdline="/weed server -dir=/tmp -volume.max=5")
+volume = api.run(cmdline="/weed volume -dir=/tmp")