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Allow for cataloging a single file (#608)

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* allow for cataloging a single file

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

* use all catalogers for file schemes

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>
This commit is contained in:
Alex Goodman
2021-11-02 12:09:06 -04:00
committed by GitHub
parent a2882ee810
commit 3ac95ac4f6
8 changed files with 199 additions and 54 deletions
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syft/source/scheme.go
+27 -19
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@@ -19,41 +19,49 @@ const (
DirectoryScheme Scheme = "DirectoryScheme"
// ImageScheme indicates the source being cataloged is a container image
ImageScheme Scheme = "ImageScheme"
// FileScheme indicates the source being cataloged is a single file
FileScheme Scheme = "FileScheme"
)
func detectScheme(fs afero.Fs, imageDetector sourceDetector, userInput string) (Scheme, image.Source, string, error) {
if strings.HasPrefix(userInput, "dir:") {
// blindly trust the user's scheme
switch {
case strings.HasPrefix(userInput, "dir:"):
dirLocation, err := homedir.Expand(strings.TrimPrefix(userInput, "dir:"))
if err != nil {
return UnknownScheme, image.UnknownSource, "", fmt.Errorf("unable to expand directory path: %w", err)
}
return DirectoryScheme, image.UnknownSource, dirLocation, nil
case strings.HasPrefix(userInput, "file:"):
fileLocation, err := homedir.Expand(strings.TrimPrefix(userInput, "file:"))
if err != nil {
return UnknownScheme, image.UnknownSource, "", fmt.Errorf("unable to expand directory path: %w", err)
}
return FileScheme, image.UnknownSource, fileLocation, nil
}
// we should attempt to let stereoscope determine what the source is first --but, just because the source is a valid directory
// doesn't mean we yet know if it is an OCI layout directory (to be treated as an image) or if it is a generic filesystem directory.
// try the most specific sources first and move out towards more generic sources.
// first: let's try the image detector, which has more scheme parsing internal to stereoscope
source, imageSpec, err := imageDetector(userInput)
if err != nil {
return UnknownScheme, image.UnknownSource, "", fmt.Errorf("unable to detect the scheme from %q: %w", userInput, err)
if err == nil && source != image.UnknownSource {
return ImageScheme, source, imageSpec, nil
}
if source == image.UnknownSource {
dirLocation, err := homedir.Expand(userInput)
if err != nil {
return UnknownScheme, image.UnknownSource, "", fmt.Errorf("unable to expand potential directory path: %w", err)
}
// next: let's try more generic sources (dir, file, etc.)
fileMeta, err := fs.Stat(dirLocation)
if err != nil {
return UnknownScheme, source, "", nil
}
location, err := homedir.Expand(userInput)
if err != nil {
return UnknownScheme, image.UnknownSource, "", fmt.Errorf("unable to expand potential directory path: %w", err)
}
if fileMeta.IsDir() {
return DirectoryScheme, source, dirLocation, nil
}
fileMeta, err := fs.Stat(location)
if err != nil {
return UnknownScheme, source, "", nil
}
return ImageScheme, source, imageSpec, nil
if fileMeta.IsDir() {
return DirectoryScheme, source, location, nil
}
return FileScheme, source, location, nil
}