Sanitize relative inputs to absolute

README.md

@@ -3,7 +3,7 @@
 ## Fast static photo and video gallery generator
 - Super fast (written in Go and C, concurrent, uses fastest image/video libraries, 4-8 times faster than others)
 - Both photo and video support
-- Deals with any file formats (ncluding HEIC, HEVC)
+- Deals with any file formats (including HEIC and HEVC)
 - Only updates changed files, runs incrementally
 - Uses relative paths (safe for using in subdirectory or S3)
 - Minimal bloat (no third party frontend libraries, minimal CSS)
@@ -28,7 +28,7 @@ For Ubuntu 18.04 bionic or 20.04 focal, first add my PPA for latest libvips with
 
 `sudo add-apt-repository ppa:tonimelisma/ppa`
 
-For dependencies, install libvips42 for images and optionally ffmpeg (if you need video support):
+Then install libvips42 for images and optionally ffmpeg (if you need video support):
 
 `apt-get install libvips42 ffmpeg`
 

cmd/fastgallery/main.go

@@ -114,7 +114,18 @@ func parseArgs() (inputDirectory string, outputDirectory string) {
 		}
 	}
 
-	return *outputDirectoryPtr, flag.Args()[0]
+	inputDirectory, err := filepath.Abs(flag.Args()[0])
+	checkError(err)
+	if err != nil {
+		os.Exit(1)
+	}
+	outputDirectory, err = filepath.Abs(*outputDirectoryPtr)
+	checkError(err)
+	if err != nil {
+		os.Exit(1)
+	}
+
+	return
 }
 
 // each file has a corresponding struct with relative and absolute paths
@@ -829,7 +840,7 @@ func main() {
 	var source directory
 
 	// parse command-line args and set HTML template ready
-	outputDirectory, inputDirectory = parseArgs()
+	inputDirectory, outputDirectory = parseArgs()
 
 	fmt.Println(os.Args[0], ": Creating photo gallery")
 	fmt.Println("")