3 files changed, 163 insertions, 2 deletions
diff --git a/cmd/yeet/internal/mkrpm/mkrpm.go b/cmd/yeet/internal/mkrpm/mkrpm.go
index 679e2b3..3816e9c 100644
--- a/cmd/yeet/internal/mkrpm/mkrpm.go
+++ b/cmd/yeet/internal/mkrpm/mkrpm.go
@@ -34,6 +34,9 @@ func Build(p pkgmeta.Package) (foutpath string, err error) {
 	if p.Version == "" {
 		p.Version = internal.GitVersion()
 	}
+	if p.Platform == "" {
+		p.Platform = "linux"
+	}
 
 	dir, err := os.MkdirTemp("", "yeet-mkrpm")
 	if err != nil {
@@ -49,7 +52,7 @@ func Build(p pkgmeta.Package) (foutpath string, err error) {
 		os.Setenv("CGO_ENABLED", cgoEnabled)
 	}()
 	os.Setenv("GOARCH", p.Goarch)
-	os.Setenv("GOOS", "linux")
+	os.Setenv("GOOS", p.Platform)
 	os.Setenv("CGO_ENABLED", "0")
 
 	p.Build(pkgmeta.BuildInput{
@@ -115,7 +118,7 @@ func Build(p pkgmeta.Package) (foutpath string, err error) {
 		Name:        p.Name,
 		Version:     p.Version,
 		Arch:        p.Goarch,
-		Platform:    "linux",
+		Platform:    p.Platform,
 		Description: p.Description,
 		Maintainer:  fmt.Sprintf("%s <%s>", *internal.UserName, *internal.UserEmail),
 		Homepage:    p.Homepage,
diff --git a/cmd/yeet/internal/mktarball/mktarball.go b/cmd/yeet/internal/mktarball/mktarball.go
new file mode 100644
index 0000000..5855403
--- /dev/null
+++ b/cmd/yeet/internal/mktarball/mktarball.go
@@ -0,0 +1,157 @@
+package mktarball
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"log/slog"
+	"os"
+	"path/filepath"
+	"runtime"
+
+	"within.website/x/cmd/yeet/internal"
+	"within.website/x/cmd/yeet/internal/pkgmeta"
+)
+
+func Build(p pkgmeta.Package) (foutpath string, err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			switch r.(type) {
+			case error:
+				err = r.(error)
+				slog.Error("mkrpm: error while building", "err", err)
+			default:
+				err = fmt.Errorf("%v", r)
+				slog.Error("mkrpm: error while building", "err", err)
+			}
+		}
+	}()
+
+	os.MkdirAll("./var", 0755)
+	os.WriteFile(filepath.Join("./var", ".gitignore"), []byte("*\n!.gitignore"), 0644)
+
+	if p.Version == "" {
+		p.Version = internal.GitVersion()
+	}
+	if p.Platform == "" {
+		p.Platform = "linux"
+	}
+
+	dir, err := os.MkdirTemp("", "yeet-mktarball")
+	if err != nil {
+		return "", fmt.Errorf("can't make temporary directory")
+	}
+	defer os.RemoveAll(dir)
+
+	pkgDir := filepath.Join(dir, fmt.Sprintf("%s-%s-%s-%s", p.Name, p.Version, p.Platform, p.Goarch))
+	os.MkdirAll(pkgDir, 0755)
+
+	fname := filepath.Join("var", fmt.Sprintf("%s-%s-%s-%s.tar.gz", p.Name, p.Version, p.Platform, p.Goarch))
+	fout, err := os.Create(fname)
+	if err != nil {
+		return "", fmt.Errorf("can't make output file: %w", err)
+	}
+	defer fout.Close()
+
+	gw, err := gzip.NewWriterLevel(fout, 9)
+	if err != nil {
+		return "", fmt.Errorf("can't make gzip writer: %w", err)
+	}
+	defer gw.Close()
+
+	tw := tar.NewWriter(gw)
+	defer tw.Close()
+
+	cgoEnabled := os.Getenv("CGO_ENABLED")
+	defer func() {
+		os.Setenv("GOARCH", runtime.GOARCH)
+		os.Setenv("GOOS", runtime.GOOS)
+		os.Setenv("CGO_ENABLED", cgoEnabled)
+	}()
+	os.Setenv("GOARCH", p.Goarch)
+	os.Setenv("GOOS", p.Platform)
+	os.Setenv("CGO_ENABLED", "0")
+
+	os.WriteFile(filepath.Join(pkgDir, "VERSION"), []byte(p.Version+"\n"), 0666)
+
+	bi := pkgmeta.BuildInput{
+		Output:  pkgDir,
+		Bin:     filepath.Join(pkgDir, "bin"),
+		Doc:     filepath.Join(pkgDir, "doc"),
+		Etc:     filepath.Join(pkgDir, "run"),
+		Man:     filepath.Join(pkgDir, "man"),
+		Systemd: filepath.Join(pkgDir, "run"),
+	}
+
+	p.Build(bi)
+
+	for src, dst := range p.ConfigFiles {
+		if err := Copy(src, filepath.Join(bi.Etc, dst)); err != nil {
+			return "", fmt.Errorf("can't copy %s to %s: %w", src, dst, err)
+		}
+	}
+
+	for src, dst := range p.Documentation {
+		fname := filepath.Join(bi.Doc, dst)
+		if filepath.Base(fname) == "README.md" {
+			fname = filepath.Join(pkgDir, "README.md")
+		}
+
+		if err := Copy(src, fname); err != nil {
+			return "", fmt.Errorf("can't copy %s to %s: %w", src, dst, err)
+		}
+	}
+
+	root, err := os.OpenRoot(dir)
+	if err != nil {
+		return "", fmt.Errorf("can't open root FS %s: %w", dir, err)
+	}
+
+	if err := tw.AddFS(root.FS()); err != nil {
+		return "", fmt.Errorf("can't copy built files to tarball: %w", err)
+	}
+
+	slog.Info("built package", "name", p.Name, "arch", p.Goarch, "version", p.Version, "path", fout.Name())
+
+	return fname, nil
+}
+
+// Copy copies the contents of the file at srcpath to a regular file
+// at dstpath. If the file named by dstpath already exists, it is
+// truncated. The function does not copy the file mode, file
+// permission bits, or file attributes.
+func Copy(srcpath, dstpath string) (err error) {
+	r, err := os.Open(srcpath)
+	if err != nil {
+		return err
+	}
+	defer r.Close() // ignore error: file was opened read-only.
+
+	st, err := r.Stat()
+	if err != nil {
+		return err
+	}
+
+	os.MkdirAll(filepath.Dir(dstpath), 0755)
+
+	w, err := os.Create(dstpath)
+	if err != nil {
+		return err
+	}
+
+	if err := w.Chmod(st.Mode()); err != nil {
+		return err
+	}
+
+	defer func() {
+		// Report the error, if any, from Close, but do so
+		// only if there isn't already an outgoing error.
+		if c := w.Close(); err == nil {
+			err = c
+		}
+	}()
+
+	_, err = io.Copy(w, r)
+	return err
+}
diff --git a/cmd/yeet/internal/pkgmeta/package.go b/cmd/yeet/internal/pkgmeta/package.go
index 1aaa5a7..e7a9bb9 100644
--- a/cmd/yeet/internal/pkgmeta/package.go
+++ b/cmd/yeet/internal/pkgmeta/package.go
@@ -7,6 +7,7 @@ type Package struct {
 	Homepage    string   `json:"homepage"`
 	Group       string   `json:"group"`
 	License     string   `json:"license"`
+	Platform    string   `json:"platform"` // if not set, default to linux
 	Goarch      string   `json:"goarch"`
 	Replaces    []string `json:"replaces"`
 	Depends     []string `json:"depends"`