feat: add argocd binary support and fix packer environment setup (#87)

This pull request adds support for managing the `argocd` binary within
the project. The main changes include introducing a new package for
`argocd`, updating the application to recognize and handle this binary,
and documenting its addition. There are also minor adjustments to
environment variable handling for consistency.

**New binary support:**

* Added a new package `pkg/binaries/argocd` with an implementation for
managing the `argocd` binary, including logic for version detection and
GitHub release fetching.
* Registered the new `argocd` binary in the main application by
importing the package and including it in the binaries list in
`cmd/b/main.go`.
[[1]](diffhunk://#diff-9220de3f3af10d1a2eb38298eefa2c9cc92852596770de03bc85dbbb6d136f9fR8)
[[2]](diffhunk://#diff-9220de3f3af10d1a2eb38298eefa2c9cc92852596770de03bc85dbbb6d136f9fR52)
* Updated the VSCode launch configuration to use `argocd` as an argument
for debugging.

**Documentation:**

* Added `argocd` to the list of supported binaries in `README.md` with a
brief description and link to the upstream repository.

**Code consistency:**

* Updated environment variable assignment in the `packer` binary
implementation for consistency with the new `argocd` approach.

Author: fentas

.vscode/launch.json

@@ -10,7 +10,7 @@
       "request": "launch",
       "mode": "debug",
       "program": "${workspaceRoot}/cmd/b/main.go",
-      "args": ["v", "envsubst"]
+      "args": ["v", "argocd"]
     } 
   ]
 }

README.md

@@ -168,6 +168,7 @@ Have a look at [pkg/binary](./pkg/binary/) for more details.
 
 Have a look at [pkg/binaries](./pkg/binaries/) for prepackaged binaries.
 
+- [argocd](https://github.com/argoproj/argo-cd) - Declarative Continuous Deployment for Kubernetes
 - [argsh](https://github.com/arg-sh/argsh) - Utilities for Bash script quality
 - `b` - (Selfupdate) Manage and execute binary files
 - [cilium](https://github.com/cilium/cilium-cli) - Providing, securing, and observing network connectivity between workloads

cmd/b/main.go

@@ -5,6 +5,7 @@ import (
 	"os"
 
 	"github.com/fentas/b/pkg/binaries"
+	"github.com/fentas/b/pkg/binaries/argocd"
 	"github.com/fentas/b/pkg/binaries/argsh"
 	"github.com/fentas/b/pkg/binaries/b"
 	"github.com/fentas/b/pkg/binaries/cilium"
@@ -48,6 +49,7 @@ func main() {
 	}
 
 	binaries := []*binary.Binary{
+		argocd.Binary(o),
 		argsh.Binary(o),
 		b.Binary(o),
 		cilium.Binary(o),

pkg/binaries/argocd/argocd.go

@@ -0,0 +1,45 @@
+// Package argocd implements the argocd binary.
+package argocd
+
+import (
+	"context"
+	"fmt"
+	"regexp"
+	"runtime"
+
+	"github.com/fentas/b/pkg/binaries"
+	"github.com/fentas/b/pkg/binary"
+)
+
+var argocdVersionRegex = regexp.MustCompile(`argocd: (v[\.\d]+)`)
+
+func Binary(options *binaries.BinaryOptions) *binary.Binary {
+	if options == nil {
+		options = &binaries.BinaryOptions{
+			Context: context.Background(),
+		}
+	}
+	return &binary.Binary{
+		Context:    options.Context,
+		Envs:       options.Envs,
+		Tracker:    options.Tracker,
+		Version:    options.Version,
+		Name:       "argocd",
+		GitHubRepo: "argoproj/argo-cd",
+		GitHubFile: fmt.Sprintf("argocd-%s-%s", runtime.GOOS, runtime.GOARCH),
+		VersionF:   binary.GithubLatest,
+		IsTarGz:    false,
+		VersionLocalF: func(b *binary.Binary) (string, error) {
+			b.Envs = map[string]string{"HOME": "/tmp"}
+			s, err := b.Exec("version", "--client", "--short")
+			if err != nil {
+				return "", err
+			}
+			v := argocdVersionRegex.FindStringSubmatch(s)
+			if len(v) != 2 {
+				return "", fmt.Errorf("argocd version regex did not match")
+			}
+			return v[1], nil
+		},
+	}
+}

pkg/binaries/packer/packer.go

@@ -36,7 +36,7 @@ func Binary(options *binaries.BinaryOptions) *binary.Binary {
 		VersionF: binary.GithubLatest,
 		IsZip:    true,
 		VersionLocalF: func(b *binary.Binary) (string, error) {
-			b.Envs["HOME"] = "/tmp"
+			b.Envs = map[string]string{"HOME": "/tmp"}
 			s, err := b.Exec("version")
 			if err != nil {
 				return "", err