main: factor out cli arg parsing

The main function has gotten way too big.

1 files changed, 76 insertions, 0 deletions

diff --git a/cli_args.go b/cli_args.go
new file mode 100644
index 0000000..413245c
--- /dev/null
+++ b/cli_args.go
@@ -0,0 +1,76 @@
+package main
+
+import (
+	"flag"
+	"os"
+	"strconv"
+
+	"github.com/rfjakob/gocryptfs/internal/configfile"
+	"github.com/rfjakob/gocryptfs/internal/prefer_openssl"
+	"github.com/rfjakob/gocryptfs/internal/tlog"
+)
+
+// argContainer stores the parsed CLI arguments
+type argContainer struct {
+	debug, init, zerokey, fusedebug, openssl, passwd, foreground, version,
+	plaintextnames, quiet, nosyslog, wpanic,
+	longnames, allow_other, ro, reverse bool
+	masterkey, mountpoint, cipherdir, cpuprofile, config, extpass,
+	memprofile, o string
+	notifypid, scryptn int
+}
+
+var flagSet *flag.FlagSet
+
+// parseCliArgs - parse command line arguments
+func parseCliArgs() (args argContainer) {
+	var err error
+	var opensslAuto string
+
+	flagSet = flag.NewFlagSet(tlog.ProgramName, flag.ExitOnError)
+	flagSet.Usage = usageText
+	flagSet.BoolVar(&args.debug, "d", false, "")
+	flagSet.BoolVar(&args.debug, "debug", false, "Enable debug output")
+	flagSet.BoolVar(&args.fusedebug, "fusedebug", false, "Enable fuse library debug output")
+	flagSet.BoolVar(&args.init, "init", false, "Initialize encrypted directory")
+	flagSet.BoolVar(&args.zerokey, "zerokey", false, "Use all-zero dummy master key")
+	// Tri-state true/false/auto
+	flagSet.StringVar(&opensslAuto, "openssl", "auto", "Use OpenSSL instead of built-in Go crypto")
+	flagSet.BoolVar(&args.passwd, "passwd", false, "Change password")
+	flagSet.BoolVar(&args.foreground, "f", false, "Stay in the foreground")
+	flagSet.BoolVar(&args.version, "version", false, "Print version and exit")
+	flagSet.BoolVar(&args.plaintextnames, "plaintextnames", false, "Do not encrypt file names")
+	flagSet.BoolVar(&args.quiet, "q", false, "")
+	flagSet.BoolVar(&args.quiet, "quiet", false, "Quiet - silence informational messages")
+	flagSet.BoolVar(&args.nosyslog, "nosyslog", false, "Do not redirect output to syslog when running in the background")
+	flagSet.BoolVar(&args.wpanic, "wpanic", false, "When encountering a warning, panic and exit immediately")
+	flagSet.BoolVar(&args.longnames, "longnames", true, "Store names longer than 176 bytes in extra files")
+	flagSet.BoolVar(&args.allow_other, "allow_other", false, "Allow other users to access the filesystem. "+
+		"Only works if user_allow_other is set in /etc/fuse.conf.")
+	flagSet.BoolVar(&args.ro, "ro", false, "Mount the filesystem read-only")
+	flagSet.BoolVar(&args.reverse, "reverse", false, "Reverse mode")
+	flagSet.StringVar(&args.masterkey, "masterkey", "", "Mount with explicit master key")
+	flagSet.StringVar(&args.cpuprofile, "cpuprofile", "", "Write cpu profile to specified file")
+	flagSet.StringVar(&args.memprofile, "memprofile", "", "Write memory profile to specified file")
+	flagSet.StringVar(&args.config, "config", "", "Use specified config file instead of CIPHERDIR/gocryptfs.conf")
+	flagSet.StringVar(&args.extpass, "extpass", "", "Use external program for the password prompt")
+	flagSet.StringVar(&args.o, "o", "", "Pass additional mount options to the kernel, comma-separated list")
+	flagSet.IntVar(&args.notifypid, "notifypid", 0, "Send USR1 to the specified process after "+
+		"successful mount - used internally for daemonization")
+	flagSet.IntVar(&args.scryptn, "scryptn", configfile.ScryptDefaultLogN, "scrypt cost parameter logN. "+
+		"Setting this to a lower value speeds up mounting but makes the password susceptible to brute-force attacks")
+	flagSet.Parse(os.Args[1:])
+
+	// "-openssl" needs some post-processing
+	if opensslAuto == "auto" {
+		args.openssl = prefer_openssl.PreferOpenSSL()
+	} else {
+		args.openssl, err = strconv.ParseBool(opensslAuto)
+		if err != nil {
+			tlog.Fatal.Printf("Invalid \"-openssl\" setting: %v", err)
+			os.Exit(ERREXIT_USAGE)
+		}
+	}
+
+	return args
+}