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https://github.com/fish-shell/fish-shell
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a8ce7bad7b
If the user is in a directory which has been unlinked, it is possible for the path .. to not exist, relative to the working directory. Always pass in the working directory (potentially virtual) to path_get_cdpath; this ensures we check absolute paths and are immune from issues if the working directory has been unlinked. Also introduce a new function path_normalize_for_cd which normalizes the "join point" of a path and a working directory. This allows us to 'cd' out of a non-existent directory, but not cd into such a directory. Fixes #5341
91 lines
3 KiB
C++
91 lines
3 KiB
C++
// Implementation of the cd builtin.
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#include "config.h" // IWYU pragma: keep
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#include <errno.h>
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#include <sys/stat.h>
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#include "builtin.h"
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#include "builtin_cd.h"
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#include "common.h"
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#include "env.h"
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#include "fallback.h" // IWYU pragma: keep
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#include "io.h"
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#include "parser.h"
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#include "path.h"
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#include "proc.h"
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#include "wutil.h" // IWYU pragma: keep
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/// The cd builtin. Changes the current directory to the one specified or to $HOME if none is
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/// specified. The directory can be relative to any directory in the CDPATH variable.
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/// The cd builtin. Changes the current directory to the one specified or to $HOME if none is
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/// specified. The directory can be relative to any directory in the CDPATH variable.
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int builtin_cd(parser_t &parser, io_streams_t &streams, wchar_t **argv) {
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const wchar_t *cmd = argv[0];
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int argc = builtin_count_args(argv);
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help_only_cmd_opts_t opts;
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int optind;
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int retval = parse_help_only_cmd_opts(opts, &optind, argc, argv, parser, streams);
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if (retval != STATUS_CMD_OK) return retval;
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if (opts.print_help) {
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builtin_print_help(parser, streams, cmd, streams.out);
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return STATUS_CMD_OK;
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}
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wcstring dir_in;
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wcstring dir;
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if (argv[optind]) {
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dir_in = argv[optind];
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} else {
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auto maybe_dir_in = env_get(L"HOME");
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if (maybe_dir_in.missing_or_empty()) {
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streams.err.append_format(_(L"%ls: Could not find home directory\n"), cmd);
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return STATUS_CMD_ERROR;
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}
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dir_in = maybe_dir_in->as_string();
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}
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if (!path_get_cdpath(dir_in, &dir, env_get_pwd_slash())) {
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if (errno == ENOTDIR) {
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streams.err.append_format(_(L"%ls: '%ls' is not a directory\n"), cmd, dir_in.c_str());
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} else if (errno == ENOENT) {
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streams.err.append_format(_(L"%ls: The directory '%ls' does not exist\n"), cmd,
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dir_in.c_str());
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} else if (errno == EROTTEN) {
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streams.err.append_format(_(L"%ls: '%ls' is a rotten symlink\n"), cmd, dir_in.c_str());
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} else {
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streams.err.append_format(_(L"%ls: Unknown error trying to locate directory '%ls'\n"),
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cmd, dir_in.c_str());
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}
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if (!shell_is_interactive()) streams.err.append(parser.current_line());
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return STATUS_CMD_ERROR;
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}
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wcstring norm_dir = normalize_path(dir);
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if (wchdir(norm_dir) != 0) {
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struct stat buffer;
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int status;
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status = wstat(dir, &buffer);
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if (!status && S_ISDIR(buffer.st_mode)) {
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streams.err.append_format(_(L"%ls: Permission denied: '%ls'\n"), cmd, dir_in.c_str());
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} else {
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streams.err.append_format(_(L"%ls: '%ls' is not a directory\n"), cmd, dir_in.c_str());
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}
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if (!shell_is_interactive()) {
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streams.err.append(parser.current_line());
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}
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return STATUS_CMD_ERROR;
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}
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env_set_one(L"PWD", ENV_EXPORT | ENV_GLOBAL, std::move(norm_dir));
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return STATUS_CMD_OK;
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}
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