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package fusefrontend_reverse
import (
"io/ioutil"
"os"
"strings"
"github.com/rfjakob/gocryptfs/internal/exitcodes"
"github.com/rfjakob/gocryptfs/internal/fusefrontend"
"github.com/rfjakob/gocryptfs/internal/tlog"
"github.com/sabhiram/go-gitignore"
)
// prepareExcluder creates an object to check if paths are excluded
// based on the patterns specified in the command line.
func prepareExcluder(args fusefrontend.Args) *ignore.GitIgnore {
if len(args.Exclude) == 0 && len(args.ExcludeWildcard) == 0 && len(args.ExcludeFrom) == 0 {
return nil
}
patterns := getExclusionPatterns(args)
if len(patterns) == 0 {
panic(patterns)
}
excluder, err := ignore.CompileIgnoreLines(patterns...)
if err != nil {
tlog.Fatal.Printf("Error compiling exclusion rules: %v", err)
os.Exit(exitcodes.ExcludeError)
}
return excluder
}
// getExclusionPatters prepares a list of patterns to be excluded.
// Patterns passed in the -exclude command line option are prefixed
// with a leading '/' to preserve backwards compatibility (before
// wildcard matching was implemented, exclusions always were matched
// against the full path).
func getExclusionPatterns(args fusefrontend.Args) []string {
patterns := make([]string, len(args.Exclude)+len(args.ExcludeWildcard))
// add -exclude
for i, p := range args.Exclude {
patterns[i] = "/" + p
}
// add -exclude-wildcard
copy(patterns[len(args.Exclude):], args.ExcludeWildcard)
// add -exclude-from
for _, file := range args.ExcludeFrom {
lines, err := getLines(file)
if err != nil {
tlog.Fatal.Printf("Error reading exclusion patterns: %q", err)
os.Exit(exitcodes.ExcludeError)
}
patterns = append(patterns, lines...)
}
return patterns
}
// getLines reads a file and splits it into lines
func getLines(file string) ([]string, error) {
buffer, err := ioutil.ReadFile(file)
if err != nil {
return nil, err
}
return strings.Split(string(buffer), "\n"), nil
}
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