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/* rm.c - remove files
*
* Copyright 2012 Rob Landley <rob@landley.net>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/rm.html
USE_RM(NEWTOY(rm, "fiRr[-fi]", TOYFLAG_BIN))
config RM
bool "rm"
default y
help
usage: rm [-fiRr] FILE...
Remove each argument from the filesystem.
-f force: remove without confirmation, no error if it doesn't exist
-i interactive: prompt for confirmation
-rR recursive: remove directory contents
*/
#define FOR_rm
#include "toys.h"
static int do_rm(struct dirtree *try)
{
int fd = dirtree_parentfd(try), flags = toys.optflags;
int dir = S_ISDIR(try->st.st_mode), or = 0, using = 0;
// Skip . and .. (yes, even explicitly on the command line: posix says to)
if (!dirtree_notdotdot(try)) return 0;
// Intentionally fail non-recursive attempts to remove even an empty dir
// (via wrong flags to unlinkat) because POSIX says to.
if (dir && !(flags & (FLAG_r|FLAG_R))) goto skip;
// This is either the posix section 2(b) prompt or the section 3 prompt.
if (!(flags & FLAG_f)
&& (!S_ISLNK(try->st.st_mode) && faccessat(fd, try->name, W_OK, 0))) or++;
if (!(dir && try->again) && ((or && isatty(0)) || (flags & FLAG_i))) {
char *s = dirtree_path(try, 0);
fprintf(stderr, "rm %s%s", or ? "ro " : "", dir ? "dir " : "");
or = yesno(s, 0);
free(s);
if (!or) goto nodelete;
}
// handle directory recursion
if (dir) {
// Handle chmod 000 directories when -f
if (faccessat(fd, try->name, R_OK, 0)) {
if (toys.optflags & FLAG_f) wfchmodat(fd, try->name, 0700);
else goto skip;
}
if (!try->again) return DIRTREE_COMEAGAIN;
using = AT_REMOVEDIR;
if (try->symlink) goto skip;
if (flags & FLAG_i) {
char *s = dirtree_path(try, 0);
// This is the section 2(d) prompt. (Yes, posix says to prompt twice.)
fprintf(stderr, "rmdir ");
or = yesno(s, 0);
free(s);
if (!or) goto nodelete;
}
}
skip:
if (unlinkat(fd, try->name, using)) {
if (!dir || try->symlink != (char *)2) perror_msg("%s", try->name);
nodelete:
if (try->parent) try->parent->symlink = (char *)2;
}
return 0;
}
void rm_main(void)
{
char **s;
// Can't use <1 in optstring because zero arguments with -f isn't an error
if (!toys.optc && !(toys.optflags & FLAG_f)) error_exit("Needs 1 argument");
for (s = toys.optargs; *s; s++) {
if (!strcmp(*s, "/")) {
error_msg("rm /. if you mean it");
continue;
}
// Files that already don't exist aren't errors for -f, so try a quick
// unlink now to see if it succeeds or reports that it didn't exist.
if ((toys.optflags & FLAG_f) && (!unlink(*s) || errno == ENOENT))
continue;
// There's a race here where a file removed between the above check and
// dirtree's stat would report the nonexistence as an error, but that's
// not a normal "it didn't exist" so I'm ok with it.
dirtree_read(*s, do_rm);
}
}
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