diff options
Diffstat (limited to 'src/fileio.c')
| -rw-r--r-- | src/fileio.c | 191 |
1 files changed, 118 insertions, 73 deletions
diff --git a/src/fileio.c b/src/fileio.c index eab268f8444..741e297d29c 100644 --- a/src/fileio.c +++ b/src/fileio.c @@ -96,7 +96,7 @@ along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */ #include <acl.h> #include <allocator.h> #include <careadlinkat.h> -#include <dosname.h> +#include <filename.h> #include <fsusage.h> #include <stat-time.h> #include <tempname.h> @@ -947,6 +947,22 @@ the root directory. */) ) { default_directory = Fexpand_file_name (default_directory, Qnil); + + /* The above expansion might have produced a remote file name, + so give the handlers one last chance to DTRT. This can + happen when both NAME and DEFAULT-DIRECTORY arguments are + relative file names, and the buffer's default-directory is + remote. */ + handler = Ffind_file_name_handler (default_directory, + Qexpand_file_name); + if (!NILP (handler)) + { + handled_name = call3 (handler, Qexpand_file_name, + name, default_directory); + if (STRINGP (handled_name)) + return handled_name; + error ("Invalid handler in `file-name-handler-alist'"); + } } } multibyte = STRING_MULTIBYTE (name); @@ -1694,7 +1710,7 @@ See also the function `substitute-in-file-name'.") #endif /* Put into BUF the concatenation of DIR and FILE, with an intervening - directory separator if needed. Return a pointer to the NUL byte + directory separator if needed. Return a pointer to the null byte at the end of the concatenated string. */ char * splice_dir_file (char *buf, char const *dir, char const *file) @@ -1952,7 +1968,10 @@ barf_or_query_if_file_exists (Lisp_Object absname, bool known_to_exist, encoded_filename = ENCODE_FILE (absname); - if (! known_to_exist && lstat (SSDATA (encoded_filename), &statbuf) == 0) + if (! known_to_exist + && (emacs_fstatat (AT_FDCWD, SSDATA (encoded_filename), + &statbuf, AT_SYMLINK_NOFOLLOW) + == 0)) { if (S_ISDIR (statbuf.st_mode)) xsignal2 (Qfile_error, @@ -2028,7 +2047,7 @@ permissions. */) ptrdiff_t count = SPECPDL_INDEX (); Lisp_Object encoded_file, encoded_newname; #if HAVE_LIBSELINUX - security_context_t con; + char *con; int conlength = 0; #endif #ifdef WINDOWSNT @@ -2074,7 +2093,7 @@ permissions. */) report_file_error ("Copying permissions from", file); case -3: xsignal2 (Qfile_date_error, - build_string ("Resetting file times"), newname); + build_string ("Cannot set file date"), newname); case -4: report_file_error ("Copying permissions to", newname); } @@ -2250,9 +2269,8 @@ permissions. */) if (!NILP (keep_time)) { - struct timespec atime = get_stat_atime (&st); - struct timespec mtime = get_stat_mtime (&st); - if (set_file_times (ofd, SSDATA (encoded_newname), atime, mtime) != 0) + struct timespec ts[] = { get_stat_atime (&st), get_stat_mtime (&st) }; + if (futimens (ofd, ts) != 0) xsignal2 (Qfile_date_error, build_string ("Cannot set file date"), newname); } @@ -2555,7 +2573,9 @@ This is what happens in interactive use with M-x. */) bool dirp = !NILP (Fdirectory_name_p (file)); if (!dirp) { - if (lstat (SSDATA (encoded_file), &file_st) != 0) + if (emacs_fstatat (AT_FDCWD, SSDATA (encoded_file), + &file_st, AT_SYMLINK_NOFOLLOW) + != 0) report_file_error ("Renaming", list2 (file, newname)); dirp = S_ISDIR (file_st.st_mode) != 0; } @@ -2899,6 +2919,11 @@ DEFUN ("file-directory-p", Ffile_directory_p, Sfile_directory_p, 1, 1, 0, doc: /* Return t if FILENAME names an existing directory. Return nil if FILENAME does not name a directory, or if there was trouble determining whether FILENAME is a directory. + +As a special case, this function will also return t if FILENAME is the +empty string (\"\"). This quirk is due to Emacs interpreting the +empty string (in some cases) as the current directory. + Symbolic links to directories count as directories. See `file-symlink-p' to distinguish symlinks. */) (Lisp_Object filename) @@ -2928,7 +2953,8 @@ file_directory_p (Lisp_Object file) #else # ifdef O_PATH /* Use O_PATH if available, as it avoids races and EOVERFLOW issues. */ - int fd = openat (AT_FDCWD, SSDATA (file), O_PATH | O_CLOEXEC | O_DIRECTORY); + int fd = emacs_openat (AT_FDCWD, SSDATA (file), + O_PATH | O_CLOEXEC | O_DIRECTORY, 0); if (0 <= fd) { emacs_close (fd); @@ -2939,9 +2965,9 @@ file_directory_p (Lisp_Object file) /* O_PATH is defined but evidently this Linux kernel predates 2.6.39. Fall back on generic POSIX code. */ # endif - /* Use file_accessible_directory_p, as it avoids stat EOVERFLOW + /* Use file_accessible_directory_p, as it avoids fstatat EOVERFLOW problems and could be cheaper. However, if it fails because FILE - is inaccessible, fall back on stat; if the latter fails with + is inaccessible, fall back on fstatat; if the latter fails with EOVERFLOW then FILE must have been a directory unless a race condition occurred (a problem hard to work around portably). */ if (file_accessible_directory_p (file)) @@ -2949,7 +2975,7 @@ file_directory_p (Lisp_Object file) if (errno != EACCES) return false; struct stat st; - if (stat (SSDATA (file), &st) != 0) + if (emacs_fstatat (AT_FDCWD, SSDATA (file), &st, 0) != 0) return errno == EOVERFLOW; if (S_ISDIR (st.st_mode)) return true; @@ -3024,7 +3050,6 @@ file_accessible_directory_p (Lisp_Object file) ptrdiff_t len = SBYTES (file); char const *dir; bool ok; - int saved_errno; USE_SAFE_ALLOCA; /* Normally a file "FOO" is an accessible directory if "FOO/." exists. @@ -3049,9 +3074,7 @@ file_accessible_directory_p (Lisp_Object file) } ok = file_access_p (dir, F_OK); - saved_errno = errno; SAFE_FREE (); - errno = saved_errno; return ok; #endif /* !DOS_NT */ } @@ -3080,7 +3103,7 @@ See `file-symlink-p' to distinguish symlinks. */) Vw32_get_true_file_attributes = Qt; #endif - int stat_result = stat (SSDATA (absname), &st); + int stat_result = emacs_fstatat (AT_FDCWD, SSDATA (absname), &st, 0); #ifdef WINDOWSNT Vw32_get_true_file_attributes = true_attributes; @@ -3113,7 +3136,7 @@ or if SELinux is disabled, or if Emacs lacks SELinux support. */) #if HAVE_LIBSELINUX if (is_selinux_enabled ()) { - security_context_t con; + char *con; int conlength = lgetfilecon (SSDATA (ENCODE_FILE (absname)), &con); if (conlength > 0) { @@ -3158,7 +3181,7 @@ or if Emacs was not compiled with SELinux support. */) Lisp_Object role = CAR_SAFE (CDR_SAFE (context)); Lisp_Object type = CAR_SAFE (CDR_SAFE (CDR_SAFE (context))); Lisp_Object range = CAR_SAFE (CDR_SAFE (CDR_SAFE (CDR_SAFE (context)))); - security_context_t con; + char *con; bool fail; int conlength; context_t parsed_con; @@ -3326,50 +3349,60 @@ support. */) return Qnil; } -DEFUN ("file-modes", Ffile_modes, Sfile_modes, 1, 1, 0, +static int +symlink_nofollow_flag (Lisp_Object flag) +{ + /* For now, treat all non-nil FLAGs like 'nofollow'. */ + return !NILP (flag) ? AT_SYMLINK_NOFOLLOW : 0; +} + +DEFUN ("file-modes", Ffile_modes, Sfile_modes, 1, 2, 0, doc: /* Return mode bits of file named FILENAME, as an integer. -Return nil if FILENAME does not exist. */) - (Lisp_Object filename) +Return nil if FILENAME does not exist. If optional FLAG is `nofollow', +do not follow FILENAME if it is a symbolic link. */) + (Lisp_Object filename, Lisp_Object flag) { struct stat st; + int nofollow = symlink_nofollow_flag (flag); Lisp_Object absname = expand_and_dir_to_file (filename); /* If the file name has special constructs in it, call the corresponding file name handler. */ Lisp_Object handler = Ffind_file_name_handler (absname, Qfile_modes); if (!NILP (handler)) - return call2 (handler, Qfile_modes, absname); + return call3 (handler, Qfile_modes, absname, flag); - if (stat (SSDATA (ENCODE_FILE (absname)), &st) != 0) + char *fname = SSDATA (ENCODE_FILE (absname)); + if (emacs_fstatat (AT_FDCWD, fname, &st, nofollow) != 0) return file_attribute_errno (absname, errno); return make_fixnum (st.st_mode & 07777); } -DEFUN ("set-file-modes", Fset_file_modes, Sset_file_modes, 2, 2, +DEFUN ("set-file-modes", Fset_file_modes, Sset_file_modes, 2, 3, "(let ((file (read-file-name \"File: \"))) \ (list file (read-file-modes nil file)))", doc: /* Set mode bits of file named FILENAME to MODE (an integer). -Only the 12 low bits of MODE are used. +Only the 12 low bits of MODE are used. If optional FLAG is `nofollow', +do not follow FILENAME if it is a symbolic link. Interactively, mode bits are read by `read-file-modes', which accepts symbolic notation, like the `chmod' command from GNU Coreutils. */) - (Lisp_Object filename, Lisp_Object mode) + (Lisp_Object filename, Lisp_Object mode, Lisp_Object flag) { - Lisp_Object absname, encoded_absname; - Lisp_Object handler; - - absname = Fexpand_file_name (filename, BVAR (current_buffer, directory)); CHECK_FIXNUM (mode); + int nofollow = symlink_nofollow_flag (flag); + Lisp_Object absname = Fexpand_file_name (filename, + BVAR (current_buffer, directory)); /* If the file name has special constructs in it, call the corresponding file name handler. */ - handler = Ffind_file_name_handler (absname, Qset_file_modes); + Lisp_Object handler = Ffind_file_name_handler (absname, Qset_file_modes); if (!NILP (handler)) - return call3 (handler, Qset_file_modes, absname, mode); - - encoded_absname = ENCODE_FILE (absname); + return call4 (handler, Qset_file_modes, absname, mode, flag); - if (chmod (SSDATA (encoded_absname), XFIXNUM (mode) & 07777) < 0) + char *fname = SSDATA (ENCODE_FILE (absname)); + mode_t imode = XFIXNUM (mode) & 07777; + if (fchmodat (AT_FDCWD, fname, imode, nofollow) != 0) report_file_error ("Doing chmod", absname); return Qnil; @@ -3414,39 +3447,41 @@ The value is an integer. */) } -DEFUN ("set-file-times", Fset_file_times, Sset_file_times, 1, 2, 0, +DEFUN ("set-file-times", Fset_file_times, Sset_file_times, 1, 3, 0, doc: /* Set times of file FILENAME to TIMESTAMP. -Set both access and modification times. -Return t on success, else nil. -Use the current time if TIMESTAMP is nil. TIMESTAMP is in the format of -`current-time'. */) - (Lisp_Object filename, Lisp_Object timestamp) +If optional FLAG is `nofollow', do not follow FILENAME if it is a +symbolic link. Set both access and modification times. Return t on +success, else nil. Use the current time if TIMESTAMP is nil. +TIMESTAMP is in the format of `current-time'. */) + (Lisp_Object filename, Lisp_Object timestamp, Lisp_Object flag) { - Lisp_Object absname, encoded_absname; - Lisp_Object handler; - struct timespec t = lisp_time_argument (timestamp); + int nofollow = symlink_nofollow_flag (flag); - absname = Fexpand_file_name (filename, BVAR (current_buffer, directory)); + struct timespec ts[2]; + if (!NILP (timestamp)) + ts[0] = ts[1] = lisp_time_argument (timestamp); + else + ts[0].tv_nsec = ts[1].tv_nsec = UTIME_NOW; /* If the file name has special constructs in it, call the corresponding file name handler. */ - handler = Ffind_file_name_handler (absname, Qset_file_times); + Lisp_Object + absname = Fexpand_file_name (filename, BVAR (current_buffer, directory)), + handler = Ffind_file_name_handler (absname, Qset_file_times); if (!NILP (handler)) - return call3 (handler, Qset_file_times, absname, timestamp); + return call4 (handler, Qset_file_times, absname, timestamp, flag); - encoded_absname = ENCODE_FILE (absname); + Lisp_Object encoded_absname = ENCODE_FILE (absname); - { - if (set_file_times (-1, SSDATA (encoded_absname), t, t) != 0) - { + if (utimensat (AT_FDCWD, SSDATA (encoded_absname), ts, nofollow) != 0) + { #ifdef MSDOS - /* Setting times on a directory always fails. */ - if (file_directory_p (encoded_absname)) - return Qnil; + /* Setting times on a directory always fails. */ + if (file_directory_p (encoded_absname)) + return Qnil; #endif - report_file_error ("Setting file times", absname); - } - } + report_file_error ("Setting file times", absname); + } return Qt; } @@ -3486,7 +3521,7 @@ otherwise, if FILE2 does not exist, the answer is t. */) return call3 (handler, Qfile_newer_than_file_p, absname1, absname2); int err1; - if (stat (SSDATA (ENCODE_FILE (absname1)), &st1) == 0) + if (emacs_fstatat (AT_FDCWD, SSDATA (ENCODE_FILE (absname1)), &st1, 0) == 0) err1 = 0; else { @@ -3494,7 +3529,7 @@ otherwise, if FILE2 does not exist, the answer is t. */) if (err1 != EOVERFLOW) return file_attribute_errno (absname1, err1); } - if (stat (SSDATA (ENCODE_FILE (absname2)), &st2) != 0) + if (emacs_fstatat (AT_FDCWD, SSDATA (ENCODE_FILE (absname2)), &st2, 0) != 0) { file_attribute_errno (absname2, errno); return Qt; @@ -3719,9 +3754,10 @@ characters in the buffer. If VISIT is non-nil, BEG and END must be nil. If optional fifth argument REPLACE is non-nil, replace the current buffer contents (in the accessible portion) with the file contents. This is better than simply deleting and inserting the whole thing -because (1) it preserves some marker positions and (2) it puts less data -in the undo list. When REPLACE is non-nil, the second return value is -the number of characters that replace previous buffer contents. +because (1) it preserves some marker positions (in unchanged portions +at the start and end of the buffer) and (2) it puts less data in the +undo list. When REPLACE is non-nil, the second return value is the +number of characters that replace previous buffer contents. This function does code conversion according to the value of `coding-system-for-read' or `file-coding-system-alist', and sets the @@ -3880,7 +3916,7 @@ by calling `format-decode', which see. */) if (end_offset < 0) buffer_overflow (); - /* The file size returned from stat may be zero, but data + /* The file size returned from fstat may be zero, but data may be readable nonetheless, for example when this is a file in the /proc filesystem. */ if (end_offset == 0) @@ -3965,7 +4001,7 @@ by calling `format-decode', which see. */) record_unwind_current_buffer (); - workbuf = Fget_buffer_create (name); + workbuf = Fget_buffer_create (name, Qt); buf = XBUFFER (workbuf); delete_all_overlays (buf); @@ -5625,7 +5661,7 @@ See Info node `(elisp)Modification Time' for more details. */) filename = ENCODE_FILE (BVAR (b, filename)); - mtime = (stat (SSDATA (filename), &st) == 0 + mtime = (emacs_fstatat (AT_FDCWD, SSDATA (filename), &st, 0) == 0 ? get_stat_mtime (&st) : time_error_value (errno)); if (timespec_cmp (mtime, b->modtime) == 0 @@ -5665,8 +5701,8 @@ in `current-time' or an integer flag as returned by `visited-file-modtime'. */) struct timespec mtime; if (FIXNUMP (time_flag)) { - CHECK_RANGED_INTEGER (time_flag, -1, 0); - mtime = make_timespec (0, UNKNOWN_MODTIME_NSECS - XFIXNUM (time_flag)); + int flag = check_integer_range (time_flag, -1, 0); + mtime = make_timespec (0, UNKNOWN_MODTIME_NSECS - flag); } else mtime = lisp_time_argument (time_flag); @@ -5689,7 +5725,8 @@ in `current-time' or an integer flag as returned by `visited-file-modtime'. */) /* The handler can find the file name the same way we did. */ return call2 (handler, Qset_visited_file_modtime, Qnil); - if (stat (SSDATA (ENCODE_FILE (filename)), &st) == 0) + if (emacs_fstatat (AT_FDCWD, SSDATA (ENCODE_FILE (filename)), &st, 0) + == 0) { current_buffer->modtime = get_stat_mtime (&st); current_buffer->modtime_size = st.st_size; @@ -5712,7 +5749,7 @@ auto_save_error (Lisp_Object error_val) Lisp_Object msg = CALLN (Fformat, format, BVAR (current_buffer, name), Ferror_message_string (error_val)); call3 (intern ("display-warning"), - intern ("auto-save"), msg, intern ("error")); + intern ("auto-save"), msg, intern (":error")); return Qnil; } @@ -5728,12 +5765,14 @@ auto_save_1 (void) /* Get visited file's mode to become the auto save file's mode. */ if (! NILP (BVAR (current_buffer, filename))) { - if (stat (SSDATA (BVAR (current_buffer, filename)), &st) >= 0) + if (emacs_fstatat (AT_FDCWD, SSDATA (BVAR (current_buffer, filename)), + &st, 0) + == 0) /* But make sure we can overwrite it later! */ auto_save_mode_bits = (st.st_mode | 0600) & 0777; - else if (modes = Ffile_modes (BVAR (current_buffer, filename)), + else if (modes = Ffile_modes (BVAR (current_buffer, filename), Qnil), FIXNUMP (modes)) - /* Remote files don't cooperate with stat. */ + /* Remote files don't cooperate with fstatat. */ auto_save_mode_bits = (XFIXNUM (modes) | 0600) & 0777; } @@ -6217,6 +6256,7 @@ syms_of_fileio (void) DEFSYM (Qfile_date_error, "file-date-error"); DEFSYM (Qfile_missing, "file-missing"); DEFSYM (Qfile_notify_error, "file-notify-error"); + DEFSYM (Qremote_file_error, "remote-file-error"); DEFSYM (Qexcl, "excl"); DEFVAR_LISP ("file-name-coding-system", Vfile_name_coding_system, @@ -6278,6 +6318,11 @@ behaves as if file names were encoded in `utf-8'. */); Fput (Qfile_notify_error, Qerror_message, build_pure_c_string ("File notification error")); + Fput (Qremote_file_error, Qerror_conditions, + Fpurecopy (list3 (Qremote_file_error, Qfile_error, Qerror))); + Fput (Qremote_file_error, Qerror_message, + build_pure_c_string ("Remote file error")); + DEFVAR_LISP ("file-name-handler-alist", Vfile_name_handler_alist, doc: /* Alist of elements (REGEXP . HANDLER) for file names handled specially. If a file name matches REGEXP, all I/O on that file is done by calling |