chown: Port to LibMain :^)

Userland/Utilities/CMakeLists.txt

@@ -65,6 +65,7 @@ target_link_libraries(cat LibMain)
 target_link_libraries(checksum LibCrypto LibMain)
 target_link_libraries(chmod LibMain)
 target_link_libraries(chgrp LibMain)
+target_link_libraries(chown LibMain)
 target_link_libraries(chres LibGUI)
 target_link_libraries(cksum LibCrypto)
 target_link_libraries(config LibConfig)

Userland/Utilities/chown.cpp

@@ -6,6 +6,8 @@
 
 #include <AK/String.h>
 #include <AK/Vector.h>
+#include <LibCore/System.h>
+#include <LibMain/Main.h>
 #include <grp.h>
 #include <pwd.h>
 #include <stdio.h>
@@ -13,14 +15,11 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
-int main(int argc, char** argv)
+ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    if (pledge("stdio rpath chown", nullptr) < 0) {
-        perror("pledge");
-        return 1;
-    }
+    TRY(Core::System::pledge("stdio rpath chown", nullptr));
 
-    if (argc < 3) {
+    if (arguments.strings.size() < 3) {
         warnln("usage: chown <uid[:gid]> <path>");
         return 1;
     }
@@ -28,7 +27,7 @@ int main(int argc, char** argv)
     uid_t new_uid = -1;
     gid_t new_gid = -1;
 
-    auto parts = String(argv[1]).split(':', true);
+    auto parts = arguments.strings[1].split_view(':', true);
     if (parts.is_empty()) {
         warnln("Empty uid/gid spec");
         return 1;
@@ -42,12 +41,8 @@ int main(int argc, char** argv)
     if (number.has_value()) {
         new_uid = number.value();
     } else {
-        auto* passwd = getpwnam(parts[0].characters());
-        if (!passwd) {
-            warnln("Unknown user '{}'", parts[0]);
-            return 1;
-        }
-        new_uid = passwd->pw_uid;
+        auto passwd = TRY(Core::System::getpwnam(parts[0]));
+        new_uid = passwd.pw_uid;
     }
 
     if (parts.size() == 2) {
@@ -55,20 +50,12 @@ int main(int argc, char** argv)
         if (number.has_value()) {
             new_gid = number.value();
         } else {
-            auto* group = getgrnam(parts[1].characters());
-            if (!group) {
-                warnln("Unknown group '{}'", parts[1]);
-                return 1;
-            }
-            new_gid = group->gr_gid;
+            auto group = TRY(Core::System::getgrnam(parts[1]));
+            new_gid = group.gr_gid;
         }
     }
 
-    int rc = chown(argv[2], new_uid, new_gid);
-    if (rc < 0) {
-        perror("chown");
-        return 1;
-    }
+    TRY(Core::System::chown(arguments.strings[2], new_uid, new_gid));
 
     return 0;
 }