From: Colin P. Mccabe <colin@cmccabe.xyz>
Date: Thu, 23 Dec 2021 22:24:45 +0000 (-0800)
Subject: Add 7z support to recursive_decompress.go
X-Git-Url: http://www.club.cc.cmu.edu/~cmccabe/cgi-bin/gitweb.cgi?p=cmccabe-bin;a=commitdiff_plain;h=f1eae14fa3fc60b16263f1f308716ac12cf587e8

Add 7z support to recursive_decompress.go
---

diff --git a/recursive_decompress.go b/recursive_decompress.go
index a642fa7..89d3d74 100644
--- a/recursive_decompress.go
+++ b/recursive_decompress.go
@@ -28,13 +28,12 @@ func processPath(curPath string) error {
 			}
 		}
 	} else {
-		tarBaseName := tarBaseName(curPath)
-		if tarBaseName != "" {
-			err = applyTarOn(curPath)
-			if err != nil {
-				return err
-			}
-			err = processPath(filepath.Join(filepath.Dir(curPath), tarBaseName))
+		extractedBaseName, err := extractIfPossible(curPath)
+		if err != nil {
+			return err
+		}
+		if extractedBaseName != "" {
+			err = processPath(filepath.Join(filepath.Dir(curPath), extractedBaseName))
 			if err != nil {
 				return err
 			}
@@ -50,23 +49,50 @@ func processPath(curPath string) error {
 	return nil
 }
 
-func tarBaseName(curPath string) string {
+func extractIfPossible(curPath string) (string, error) {
 	if strings.HasSuffix(curPath, ".tgz") {
-		return filepath.Base(curPath[:len(curPath)-4])
+		return extractTgz(curPath)
+	} else if strings.HasSuffix(curPath, ".7z") {
+		return extract7z(curPath)
 	}
-	return ""
+	return "", nil
 }
 
-func applyTarOn(curPath string) error {
+func extractTgz(curPath string) (string, error) {
 	fmt.Printf("== decompressing tar file %s\n", curPath)
 	cmd := exec.Command("tar", "xvf", filepath.Base(curPath))
 	cmd.Dir = filepath.Dir(curPath)
 	//cmd.Stdout = os.Stdout
 	err := cmd.Run()
 	if err != nil {
-		return fmt.Errorf("error running tar xvf on %s: %s", curPath, err.Error())
+		return "", fmt.Errorf("error running tar xvf on %s: %s", curPath, err.Error())
 	}
-	return nil
+	return filepath.Base(curPath[:len(curPath) - len(".tgz")]), nil
+}
+
+func extract7z(curPath string) (string, error) {
+	fmt.Printf("== decompressing 7z file %s\n", curPath)
+	extractedBaseName := curPath[:len(curPath) - len(".7z")]
+	err := os.Mkdir(extractedBaseName, 0755)
+	if err != nil {
+		return "", fmt.Errorf("unable to mkdir '%s': %s", extractedBaseName, err.Error())
+	}
+	absCurPath, err := filepath.Abs(curPath)
+	if err != nil {
+		return "", fmt.Errorf("unable to get absolute path for '%s': %s", curPath, err.Error())
+	}
+	absExtractedBaseName, err := filepath.Abs(extractedBaseName)
+	if err != nil {
+		return "", fmt.Errorf("unable to get absolute path for '%s': %s", extractedBaseName, err.Error())
+	}
+	cmd := exec.Command("7z", "x", absCurPath)
+	cmd.Dir = absExtractedBaseName
+	cmd.Stdout = os.Stdout
+	err = cmd.Run()
+	if err != nil {
+		return "", fmt.Errorf("error running 7z on %s: %s", curPath, err.Error())
+	}
+	return extractedBaseName, nil
 }
 
 func main() {