better prebuilts

Author: cvilsmeier

README.md

@@ -72,10 +72,10 @@ For usage examples, see `examples` directory.
 Building
 ------------------------------------------------------------------------------
 
-The library uses a pre-built embedded build of sqinn for Linux/amd64 and
-Windows/amd64.
+The library includes a prebuilt embedded build of sqinn for linux_amd64 and
+windows_amd64.
 
-If you do not want to use a pre-built sqinn binary, you can compile sqinn
+If you do not want to use a prebuilt sqinn binary, you can compile sqinn
 yourself. See <https://github.com/cvilsmeier/sqinn> for instructions.
 You must then specify the path to sqinn like so:
 
@@ -181,6 +181,11 @@ might occur. The PRAGMA busy_timeout might help to avoid SQLITE_BUSY errors.
 Changelog
 ------------------------------------------------------------------------------
 
+### v2.1.0-dev
+
+- better prebuilts (gzip and use bulid constraints)
+
+
 ### v2.0.1
 
 - ValXy const is now byte (was untyped)

prebuilt/howto.md

@@ -0,0 +1,17 @@
+HOWTO MAKE PREBUILT
+--------------------------------------
+
+Sqinn-go embeds prebuilt sqinn binaries for convenience.
+Currently it embeds linux_amd64 and windows_amd64.
+
+To update them, do this:
+
+- Download latest sqinn builds from https://github.com/cvilsmeier/sqinn/releases
+
+- Extract dist-*.zip archives (e.g. in Downloads folder)
+    
+    cd prebuilt
+    cat ~/Downloads/dist-linux-amd64/sqinn | gzip > linux-amd64.gz
+    cat ~/Downloads/dist-windows-amd64/sqinn.exe | gzip > windows-amd64.gz
+
+That's it.

prebuilt/linux-amd64.gz

@@ -0,0 +1,40 @@
+package prebuilt
+
+import (
+	"bytes"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"runtime"
+)
+
+func Extract() (_dirname string, _filename string, _err error) {
+	if len(gzipData) == 0 {
+		platform := runtime.GOOS + "_" + runtime.GOARCH
+		return "", "", fmt.Errorf("no embedded prebuilt sqinn binary found for %s, please build your own, see https://github.com/cvilsmeier/sqinn for build instructions", platform)
+	}
+	tempdir, err := os.MkdirTemp("", "")
+	if err != nil {
+		return "", "", err
+	}
+	tempname := filepath.Join(tempdir, "sqinn")
+	gr, err := gzip.NewReader(bytes.NewReader(gzipData))
+	if err != nil {
+		os.RemoveAll(tempdir)
+		return "", "", err
+	}
+	f, err := os.OpenFile(tempname, os.O_RDWR|os.O_CREATE, 0755)
+	if err != nil {
+		os.RemoveAll(tempdir)
+		return "", "", err
+	}
+	defer f.Close()
+	_, err = io.Copy(f, gr)
+	if err != nil {
+		os.RemoveAll(tempdir)
+		return "", "", err
+	}
+	return tempdir, tempname, nil
+}

prebuilt/linux/sqinn

@@ -0,0 +1,8 @@
+package prebuilt
+
+import (
+	_ "embed"
+)
+
+//go:embed "linux-amd64.gz"
+var gzipData []byte

prebuilt/prebuilt.go

@@ -0,0 +1,5 @@
+//go:build !((linux || windows) && amd64)
+
+package prebuilt
+
+var gzipData []byte = nil

prebuilt/prebuilt_linux_amd64.go

@@ -0,0 +1,8 @@
+package prebuilt
+
+import (
+	_ "embed"
+)
+
+//go:embed "windows-amd64.gz"
+var gzipData []byte