Add go modules and instructions for static building

README.md

@@ -1,2 +1,32 @@
 # git-get
 
+## Build
+
+How to build with libgit2 statically linked into a single executable without dependencies:
+
+- Install development packages for libssh2 and openssl:
+  ```
+  sudo apt install libssh2-1-del libssl-dev
+  ```
+
+- `git2go` library is added as a submodule (pointing to a correct v30 release). This, in turn, contains `libgit2` submodule.
+  To ensure the submodules are cloned run:
+  ``` 
+  git submodule update --init --recursive
+  ```
+
+- build the static `git2go` library:
+  ```
+  cd static/git2go && make install-static
+  ```
+
+- ensure our `git-get` module uses the static `git2go` library instead of the one downloaded by Go modules by having
+  the following line in `go.mod`:
+  ```
+  replace github.com/libgit2/git2go/v30 => ./static/git2go
+  ```
+
+- build `git-get` with `--tags static` flag:
+  ```
+  go build -i --tags static
+  ```

git-get.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"github.com/libgit2/git2go/v30"
+)
+import "fmt"
+
+func main() {
+	options := &git.CloneOptions{
+		CheckoutOpts:         nil,
+		FetchOptions:         nil,
+		Bare:                 false,
+		CheckoutBranch:       "",
+		RemoteCreateCallback: nil,
+	}
+
+	repo, err := git.Clone("https://gitlab.com/grdl/dotfiles.git", "/tmp/dotfiles/", options)
+	if err != nil {
+		panic(err.Error())
+	}
+	fmt.Println(repo.IsBare())
+}

go.mod

@@ -0,0 +1,8 @@
+module git-get
+
+go 1.14
+
+require github.com/libgit2/git2go/v30 v30.0.3
+
+replace github.com/libgit2/git2go/v30 => ./static/git2go
+

go.sum

@@ -0,0 +1,2 @@
+github.com/libgit2/git2go/v30 v30.0.3 h1:v+KRMhx85kHS0JzkPft7Wnt3+VUrYQrD/SQ77usTO/w=
+github.com/libgit2/git2go/v30 v30.0.3/go.mod h1:YReiQ7xhMoyAL4ISYFLZt+OGqn6xtLqvTC1xJ9oAH7Y=