xref: /third_party/toybox/toys/posix/rm.c (revision 0f66f451) 
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, "fiRrv[-fi]", TOYFLAG_BIN))
8
9config RM
10  bool "rm"
11  default y
12  help
13    usage: rm [-fiRrv] 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    -v	Verbose
21*/
22
23#define FOR_rm
24#include "toys.h"
25
26static int do_rm(struct dirtree *try)
27{
28  int fd=dirtree_parentfd(try), 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 (isdotdot(try->name)) 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 && !(toys.optflags & (FLAG_r|FLAG_R))) goto skip;
36
37  // This is either the posix section 2(b) prompt or the section 3 prompt.
38  if (!FLAG(f)
39    && (!S_ISLNK(try->st.st_mode) && faccessat(fd, try->name, W_OK, 0))) or++;
40
41  // Posix section 1(a), don't prompt for nonexistent.
42  if (or && errno == ENOENT) goto skip;
43
44  if (!(dir && try->again) && ((or && isatty(0)) || FLAG(i))) {
45    char *s = dirtree_path(try, 0);
46
47    fprintf(stderr, "rm %s%s%s", or ? "ro " : "", dir ? "dir " : "", s);
48    free(s);
49    or = yesno(0);
50    if (!or) goto nodelete;
51  }
52
53  // handle directory recursion
54  if (dir) {
55    using = AT_REMOVEDIR;
56    // Handle chmod 000 directories when -f
57    if (faccessat(fd, try->name, R_OK, 0)) {
58      if (FLAG(f)) wfchmodat(fd, try->name, 0700);
59      else goto skip;
60    }
61    if (!try->again) return DIRTREE_COMEAGAIN;
62    if (try->symlink) goto skip;
63    if (FLAG(i)) {
64      char *s = dirtree_path(try, 0);
65
66      // This is the section 2(d) prompt. (Yes, posix says to prompt twice.)
67      fprintf(stderr, "rmdir %s", s);
68      free(s);
69      or = yesno(0);
70      if (!or) goto nodelete;
71    }
72  }
73
74skip:
75  if (!unlinkat(fd, try->name, using)) {
76    if (FLAG(v)) {
77      char *s = dirtree_path(try, 0);
78      printf("%s%s '%s'\n", toys.which->name, dir ? "dir" : "", s);
79      free(s);
80    }
81  } else {
82    if (!dir || try->symlink != (char *)2) perror_msg_raw(try->name);
83nodelete:
84    if (try->parent) try->parent->symlink = (char *)2;
85  }
86
87  return 0;
88}
89
90void rm_main(void)
91{
92  char **s;
93
94  // Can't use <1 in optstring because zero arguments with -f isn't an error
95  if (!toys.optc && !FLAG(f)) help_exit("Needs 1 argument");
96
97  for (s = toys.optargs; *s; s++) {
98    if (!strcmp(*s, "/")) {
99      error_msg("rm /. if you mean it");
100      continue;
101    }
102    // "rm dir/.*" can expand to include .. which generally isn't what you want
103    if (!strcmp("..", basename(*s))) {
104      error_msg("bad path %s", *s);
105      continue;
106    }
107
108    // Files that already don't exist aren't errors for -f. Use lstat() instead
109    // of faccessat() because bionic doesn't support AT_SYMLINK_NOFOLLOW
110    if (FLAG(f) && lstat(*s, (void *)toybuf) && errno == ENOENT) continue;
111
112    // There's a race here where a file removed between the above check and
113    // dirtree's stat would report the nonexistence as an error, but that's
114    // not a normal "it didn't exist" so I'm ok with it.
115    dirtree_read(*s, do_rm);
116  }
117}
118