rm.c revision 829497311b541b63e08aa17768c8e67e95b73638 
1/* rm.c - remove files
2 *
3 * Copyright 2012 Rob Landley <rob@landley.net>
4 *
5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/rm.html
6
7USE_RM(NEWTOY(rm, "fiRr[-fi]", TOYFLAG_BIN))
8
9config RM
10  bool "rm"
11  default y
12  help
13    usage: rm [-fiRr] FILE...
14
15    Remove each argument from the filesystem.
16
17    -f	force: remove without confirmation, no error if it doesn't exist
18    -i	interactive: prompt for confirmation
19    -rR	recursive: remove directory contents
20*/
21
22#define FOR_rm
23#include "toys.h"
24
25static int do_rm(struct dirtree *try)
26{
27  int fd = dirtree_parentfd(try), flags = toys.optflags;
28  int dir = S_ISDIR(try->st.st_mode), or = 0, using = 0;
29
30  // Skip . and .. (yes, even explicitly on the command line: posix says to)
31  if (!dirtree_notdotdot(try)) return 0;
32
33  // Intentionally fail non-recursive attempts to remove even an empty dir
34  // (via wrong flags to unlinkat) because POSIX says to.
35  if (dir && !(flags & (FLAG_r|FLAG_R))) goto skip;
36
37  // This is either the posix section 2(b) prompt or the section 3 prompt.
38  if (!(flags & FLAG_f)
39    && (!S_ISLNK(try->st.st_mode) && faccessat(fd, try->name, W_OK, 0))) or++;
40  if (!(dir && try->data == -1) && ((or && isatty(0)) || (flags & FLAG_i))) {
41    char *s = dirtree_path(try, 0);
42    fprintf(stderr, "rm %s%s", or ? "ro " : "", dir ? "dir " : "");
43    or = yesno(s, 0);
44    free(s);
45    if (!or) goto nodelete;
46  }
47
48  // handle directory recursion
49  if (dir) {
50    if (try->data != -1) return DIRTREE_COMEAGAIN;
51    using = AT_REMOVEDIR;
52    if (try->symlink) goto skip;
53    if (flags & FLAG_i) {
54      char *s = dirtree_path(try, 0);
55      // This is the section 2(d) prompt. (Yes, posix says to prompt twice.)
56      fprintf(stderr, "rmdir ");
57      or = yesno(s, 0);
58      free(s);
59      if (!or) goto nodelete;
60    }
61  }
62
63skip:
64  if (unlinkat(fd, try->name, using)) {
65    if (!dir || try->symlink != 2) perror_msg("%s", try->name);
66nodelete:
67    if (try->parent) try->parent->symlink = (char *)2;
68  }
69
70  return 0;
71}
72
73void rm_main(void)
74{
75  char **s;
76
77  // Can't use <1 in optstring because zero arguments with -f isn't an error
78  if (!toys.optc && !(toys.optflags & FLAG_f)) error_exit("Needs 1 argument");
79
80  for (s = toys.optargs; *s; s++) {
81    if (!strcmp(*s, "/")) {
82      error_msg("rm /. if you mean it");
83      continue;
84    }
85
86    // There's a race here where a file removed between this access and
87    // dirtree's stat would report the nonexistence as an error, but that's
88    // not a normal "it didn't exist" so I'm ok with it.
89    if ((toys.optflags & FLAG_f) && (access(*s, F_OK) && errno == ENOENT))
90      continue;
91    dirtree_read(*s, do_rm);
92  }
93}
94