veritysetup: give command line parameters proper names

Accessing the various arguments always through argv[] is nasty, since
it's not obvious what we are talking about here. Let's give things nice
names.

We did the same in cryptsetup a while back.

diff --git a/src/veritysetup/veritysetup.c b/src/veritysetup/veritysetup.c
index 3b5cb53b4a1eae6fcf7dd65fa582965af936462b..5fc74f1c31f501dfa1169d2693a54862bdb4c919 100644 (file)
--- a/src/veritysetup/veritysetup.c
+++ b/src/veritysetup/veritysetup.c
@@ -111,6 +111,7 @@ static int parse_options(const char *options) {
 
 static int run(int argc, char *argv[]) {
         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
+        const char *verb;
         int r;
 
         if (argc <= 1 ||
@@ -128,7 +129,10 @@ static int run(int argc, char *argv[]) {
 
         umask(0022);
 
-        if (streq(argv[1], "attach")) {
+        verb = argv[1];
+
+        if (streq(verb, "attach")) {
+                const char *volume, *data_device, *verity_device, *root_hash, *options;
                 _cleanup_free_ void *m = NULL;
                 crypt_status_info status;
                 size_t l;
@@ -136,24 +140,30 @@ static int run(int argc, char *argv[]) {
                 if (argc < 6)
                         return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "attach requires at least four arguments.");
 
-                r = unhexmem(argv[5], strlen(argv[5]), &m, &l);
+                volume = argv[2];
+                data_device = argv[3];
+                verity_device = argv[4];
+                root_hash = argv[5];
+                options = argv[6];
+
+                r = unhexmem(root_hash, SIZE_MAX, &m, &l);
                 if (r < 0)
                         return log_error_errno(r, "Failed to parse root hash: %m");
 
-                r = crypt_init(&cd, argv[4]);
+                r = crypt_init(&cd, verity_device);
                 if (r < 0)
-                        return log_error_errno(r, "Failed to open verity device %s: %m", argv[4]);
+                        return log_error_errno(r, "Failed to open verity device %s: %m", verity_device);
 
                 cryptsetup_enable_logging(cd);
 
-                status = crypt_status(cd, argv[2]);
+                status = crypt_status(cd, volume);
                 if (IN_SET(status, CRYPT_ACTIVE, CRYPT_BUSY)) {
-                        log_info("Volume %s already active.", argv[2]);
+                        log_info("Volume %s already active.", volume);
                         return 0;
                 }
 
                 if (argc > 6) {
-                        r = parse_options(argv[6]);
+                        r = parse_options(options);
                         if (r < 0)
                                 return log_error_errno(r, "Failed to parse options: %m");
                 }
@@ -162,7 +172,7 @@ static int run(int argc, char *argv[]) {
                 if (r < 0)
                         return log_error_errno(r, "Failed to load verity superblock: %m");
 
-                r = crypt_set_data_device(cd, argv[3]);
+                r = crypt_set_data_device(cd, data_device);
                 if (r < 0)
                         return log_error_errno(r, "Failed to configure data device: %m");
 
@@ -186,20 +196,23 @@ static int run(int argc, char *argv[]) {
                                         return log_error_errno(r, "Failed to read root hash signature: %m");
                         }
 
-                        r = crypt_activate_by_signed_key(cd, argv[2], m, l, hash_sig, hash_sig_size, arg_activate_flags);
+                        r = crypt_activate_by_signed_key(cd, volume, m, l, hash_sig, hash_sig_size, arg_activate_flags);
 #else
                         assert_not_reached();
 #endif
                 } else
-                        r = crypt_activate_by_volume_key(cd, argv[2], m, l, arg_activate_flags);
+                        r = crypt_activate_by_volume_key(cd, volume, m, l, arg_activate_flags);
                 if (r < 0)
                         return log_error_errno(r, "Failed to set up verity device: %m");
 
-        } else if (streq(argv[1], "detach")) {
+        } else if (streq(verb, "detach")) {
+                const char *volume;
+
+                volume = argv[2];
 
-                r = crypt_init_by_name(&cd, argv[2]);
+                r = crypt_init_by_name(&cd, volume);
                 if (r == -ENODEV) {
-                        log_info("Volume %s already inactive.", argv[2]);
+                        log_info("Volume %s already inactive.", volume);
                         return 0;
                 }
                 if (r < 0)
@@ -207,12 +220,12 @@ static int run(int argc, char *argv[]) {
 
                 cryptsetup_enable_logging(cd);
 
-                r = crypt_deactivate(cd, argv[2]);
+                r = crypt_deactivate(cd, volume);
                 if (r < 0)
                         return log_error_errno(r, "Failed to deactivate: %m");
 
         } else
-                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown verb %s.", argv[1]);
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown verb %s.", verb);
 
         return 0;
 }