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Utilities/ls: Add an option to print raw inode numbers
This is only possible if listing an entire directory, because the LibC readdir function will return the raw inode number in each struct dirent, therefore allowing to print it as well.
This commit is contained in:
Liav A
Jelle Raaijmakers
parent
93ef955597
commit
29fb3a1a60
Notes:
sideshowbarker
2024-07-17 09:37:30 +09:00
Author: https://github.com/supercomputer7 Commit: https://github.com/SerenityOS/serenity/commit/29fb3a1a60 Pull-request: https://github.com/SerenityOS/serenity/pull/20358 Reviewed-by: https://github.com/gmta ✅
2 changed files with 58 additions and 15 deletions
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@ -27,6 +27,7 @@ If no *path* argument is provided the current working directory is used.
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* `-r`, `--reverse`: Reverse sort order
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* `-G`: Use pretty colors
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* `-i`, `--inode`: Show inode ids
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* `-I`, `--raw-inode`: Show raw inode ids if possible (see Notes to understand when this will not work)
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* `-n`, `--numeric-uid-gid`: In long format, display numeric UID/GID
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* `-o`, In long format, do not show group information
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* `-h`, `--human-readable`: Print human-readable sizes
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@ -54,5 +55,15 @@ $ ls /etc
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$ ls -la /etc
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```
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## Notes
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Printing raw inode numbers is only possible when listing an entire directory.
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This happens because the program uses the LibC `readdir` function, which
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will provide the raw inode numbers as they're appearing "on disk".
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In other cases, when strictly using the LibC `lstat` function the kernel
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will resolve the inode number with respect to the mount table, so if there
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is a mounted filesystem on a directory entry, `lstat` will give the root
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inode number for that filesystem.
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## See also
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* [`tree`(1)](help://man/1/tree) to show the contents of the directory and subdirectories in a tree visualization
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@ -38,6 +38,7 @@
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struct FileMetadata {
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DeprecatedString name;
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DeprecatedString path;
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ino_t raw_inode_number;
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struct stat stat {
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};
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};
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@ -57,6 +58,7 @@ static bool flag_show_almost_all_dotfiles = false;
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static bool flag_ignore_backups = false;
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static bool flag_list_directories_only = false;
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static bool flag_show_inode = false;
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static bool flag_show_raw_inode = false;
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static bool flag_print_numeric = false;
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static bool flag_hide_group = false;
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static bool flag_human_readable = false;
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@ -111,6 +113,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
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args_parser.add_option(flag_classify, "Append a file type indicator to entries", "classify", 'F');
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args_parser.add_option(flag_colorize, "Use pretty colors", nullptr, 'G');
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args_parser.add_option(flag_show_inode, "Show inode ids", "inode", 'i');
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args_parser.add_option(flag_show_raw_inode, "Show raw inode ids if possible", "raw-inode", 'I');
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args_parser.add_option(flag_print_numeric, "In long format, display numeric UID/GID", "numeric-uid-gid", 'n');
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args_parser.add_option(flag_hide_group, "In long format, do not show group information", nullptr, 'o');
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args_parser.add_option(flag_human_readable, "Print human-readable sizes", "human-readable", 'h');
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@ -146,7 +149,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
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Vector<FileMetadata> files;
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for (auto& path : paths) {
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FileMetadata metadata;
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FileMetadata metadata {};
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metadata.name = path;
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int rc = lstat(DeprecatedString(path).characters(), &metadata.stat);
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@ -300,10 +303,16 @@ static size_t print_name(const struct stat& st, DeprecatedString const& name, Op
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return nprinted;
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}
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static bool print_filesystem_object(DeprecatedString const& path, DeprecatedString const& name, const struct stat& st)
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static bool print_filesystem_object(DeprecatedString const& path, DeprecatedString const& name, const struct stat& st, Optional<ino_t> raw_inode_number)
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{
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if (flag_show_inode)
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if (flag_show_inode) {
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printf("%s ", DeprecatedString::formatted("{}", st.st_ino).characters());
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} else if (flag_show_raw_inode) {
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if (raw_inode_number.has_value())
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printf("%s ", DeprecatedString::formatted("{}", raw_inode_number.value()).characters());
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else
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printf("n/a ");
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}
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if (S_ISDIR(st.st_mode))
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printf("d");
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@ -375,6 +384,11 @@ static bool print_filesystem_object(DeprecatedString const& path, DeprecatedStri
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return true;
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}
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static bool print_filesystem_metadata_object(FileMetadata const& file)
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{
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return print_filesystem_object(file.path, file.name, file.stat, file.raw_inode_number);
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}
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static int do_file_system_object_long(DeprecatedString const& path)
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{
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if (flag_list_directories_only) {
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@ -383,7 +397,9 @@ static int do_file_system_object_long(DeprecatedString const& path)
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int rc = lstat(path.characters(), &stat);
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if (rc < 0)
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perror("lstat");
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if (print_filesystem_object(path, path, stat))
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if (flag_show_raw_inode)
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fprintf(stderr, "warning: can't print raw inode numbers\n");
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if (print_filesystem_object(path, path, stat, {}))
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return 0;
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return 2;
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}
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@ -404,7 +420,9 @@ static int do_file_system_object_long(DeprecatedString const& path)
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int rc = lstat(path.characters(), &stat);
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if (rc < 0)
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perror("lstat");
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if (print_filesystem_object(path, path, stat))
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if (flag_show_raw_inode)
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fprintf(stderr, "warning: can't print raw inode numbers\n");
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if (print_filesystem_object(path, path, stat, {}))
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return 0;
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return 2;
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}
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@ -414,8 +432,10 @@ static int do_file_system_object_long(DeprecatedString const& path)
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Vector<FileMetadata> files;
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while (di.has_next()) {
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FileMetadata metadata;
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metadata.name = di.next_path();
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auto dirent = di.next().value();
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FileMetadata metadata {};
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metadata.name = dirent.name;
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metadata.raw_inode_number = dirent.inode_number;
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VERIFY(!metadata.name.is_empty());
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if (metadata.name.ends_with('~') && flag_ignore_backups && metadata.name != path)
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@ -437,13 +457,13 @@ static int do_file_system_object_long(DeprecatedString const& path)
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quick_sort(files, filemetadata_comparator);
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for (auto& file : files) {
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if (!print_filesystem_object(file.path, file.name, file.stat))
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if (!print_filesystem_metadata_object(file))
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return 2;
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}
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return 0;
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}
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static bool print_filesystem_object_short(DeprecatedString const& path, char const* name, size_t* nprinted)
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static bool print_filesystem_object_short(DeprecatedString const& path, char const* name, Optional<ino_t> raw_inode_number, size_t* nprinted)
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{
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struct stat st;
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int rc = lstat(path.characters(), &st);
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@ -452,8 +472,14 @@ static bool print_filesystem_object_short(DeprecatedString const& path, char con
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return false;
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}
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if (flag_show_inode)
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if (flag_show_inode) {
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printf("%s ", DeprecatedString::formatted("{}", st.st_ino).characters());
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} else if (flag_show_raw_inode) {
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if (raw_inode_number.has_value())
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printf("%s ", DeprecatedString::formatted("{}", raw_inode_number.value()).characters());
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else
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printf("n/a ");
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}
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*nprinted = print_name(st, name, {}, path);
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return true;
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@ -469,7 +495,7 @@ static bool print_names(char const* path, size_t longest_name, Vector<FileMetada
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builder.append({ path, strlen(path) });
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builder.append('/');
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builder.append(name);
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if (!print_filesystem_object_short(builder.to_deprecated_string(), name.characters(), &nprinted))
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if (!print_filesystem_object_short(builder.to_deprecated_string(), name.characters(), files[i].raw_inode_number, &nprinted))
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return 2;
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int offset = 0;
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if (terminal_columns > longest_name)
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@ -496,8 +522,10 @@ static bool print_names(char const* path, size_t longest_name, Vector<FileMetada
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int do_file_system_object_short(DeprecatedString const& path)
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{
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if (flag_list_directories_only) {
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if (flag_show_raw_inode)
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fprintf(stderr, "warning: can't print raw inode numbers\n");
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size_t nprinted = 0;
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bool status = print_filesystem_object_short(path, path.characters(), &nprinted);
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bool status = print_filesystem_object_short(path, path.characters(), {}, &nprinted);
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printf("\n");
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if (status)
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return 0;
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@ -515,7 +543,9 @@ int do_file_system_object_short(DeprecatedString const& path)
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auto error = di.error();
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if (error.code() == ENOTDIR) {
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size_t nprinted = 0;
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bool status = print_filesystem_object_short(path, path.characters(), &nprinted);
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if (flag_show_raw_inode)
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fprintf(stderr, "warning: can't print raw inode numbers\n");
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bool status = print_filesystem_object_short(path, path.characters(), {}, &nprinted);
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printf("\n");
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if (status)
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return 0;
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@ -528,8 +558,10 @@ int do_file_system_object_short(DeprecatedString const& path)
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Vector<FileMetadata> files;
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size_t longest_name = 0;
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while (di.has_next()) {
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FileMetadata metadata;
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metadata.name = di.next_path();
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auto dirent = di.next().value();
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FileMetadata metadata {};
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metadata.name = dirent.name;
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metadata.raw_inode_number = dirent.inode_number;
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if (metadata.name.ends_with('~') && flag_ignore_backups && metadata.name != path)
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continue;
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