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119 lines
3.9 KiB
C++
119 lines
3.9 KiB
C++
// Implementation of the cd builtin.
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#include "config.h" // IWYU pragma: keep
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#include "builtin_cd.h"
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <cerrno>
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#include "builtin.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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maybe_t<int> builtin_cd(parser_t &parser, io_streams_t &streams, const 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);
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return STATUS_CMD_OK;
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}
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wcstring dir_in;
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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 = parser.vars().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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wcstring pwd = parser.vars().get_pwd_slash();
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auto dirs = path_apply_cdpath(dir_in, pwd, parser.vars());
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if (dirs.empty()) {
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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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if (!parser.is_interactive()) streams.err.append(parser.current_line());
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return STATUS_CMD_ERROR;
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}
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errno = 0;
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auto best_errno = errno;
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for (const auto &dir : dirs) {
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wcstring norm_dir = normalize_path(dir);
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// We need to keep around the fd for this directory, in the parser.
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errno = 0;
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autoclose_fd_t dir_fd(wopen_cloexec(norm_dir, O_RDONLY));
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bool success = dir_fd.valid() && fchdir(dir_fd.fd()) == 0;
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if (!success) {
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// Some errors we skip and only report if nothing worked.
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// ENOENT in particular is very low priority
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// - if in another directory there was a *file* by the correct name
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// we prefer *that* error because it's more specific
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if (errno == ENOENT) {
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if (!best_errno) best_errno = errno;
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continue;
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} else if (errno == ENOTDIR) {
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best_errno = errno;
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continue;
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}
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best_errno = errno;
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break;
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}
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parser.libdata().cwd_fd = std::make_shared<const autoclose_fd_t>(std::move(dir_fd));
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std::vector<event_t> evts;
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parser.vars().set_one(L"PWD", ENV_EXPORT | ENV_GLOBAL, std::move(norm_dir), &evts);
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for (const auto &evt : evts) {
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event_fire(parser, evt);
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}
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return STATUS_CMD_OK;
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}
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if (best_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 (best_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 (best_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 if (best_errno == EACCES) {
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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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errno = best_errno;
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wperror(L"cd");
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streams.err.append_format(_(L"%ls: Unknown error trying to locate directory '%ls'\n"), cmd,
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dir_in.c_str());
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}
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if (!parser.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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