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
7 USE_RM(NEWTOY(rm, "fiRrv[-fi]", TOYFLAG_BIN))
8
9 config 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
do_rm(struct dirtree * try)26 static int do_rm(struct dirtree *try)
27 {
28 int fd = dirtree_parentfd(try), flags = toys.optflags;
29 int dir = S_ISDIR(try->st.st_mode), or = 0, using = 0;
30
31 // Skip . and .. (yes, even explicitly on the command line: posix says to)
32 if (isdotdot(try->name)) return 0;
33
34 // Intentionally fail non-recursive attempts to remove even an empty dir
35 // (via wrong flags to unlinkat) because POSIX says to.
36 if (dir && !(flags & (FLAG_r|FLAG_R))) goto skip;
37
38 // This is either the posix section 2(b) prompt or the section 3 prompt.
39 if (!(flags & FLAG_f)
40 && (!S_ISLNK(try->st.st_mode) && faccessat(fd, try->name, W_OK, 0))) or++;
41 if (!(dir && try->again) && ((or && isatty(0)) || (flags & FLAG_i))) {
42 char *s = dirtree_path(try, 0);
43
44 fprintf(stderr, "rm %s%s%s", or ? "ro " : "", dir ? "dir " : "", s);
45 free(s);
46 or = yesno(0);
47 if (!or) goto nodelete;
48 }
49
50 // handle directory recursion
51 if (dir) {
52 using = AT_REMOVEDIR;
53 // Handle chmod 000 directories when -f
54 if (faccessat(fd, try->name, R_OK, 0)) {
55 if (toys.optflags & FLAG_f) wfchmodat(fd, try->name, 0700);
56 else goto skip;
57 }
58 if (!try->again) return DIRTREE_COMEAGAIN;
59 if (try->symlink) goto skip;
60 if (flags & FLAG_i) {
61 char *s = dirtree_path(try, 0);
62
63 // This is the section 2(d) prompt. (Yes, posix says to prompt twice.)
64 fprintf(stderr, "rmdir %s", s);
65 free(s);
66 or = yesno(0);
67 if (!or) goto nodelete;
68 }
69 }
70
71 skip:
72 if (!unlinkat(fd, try->name, using)) {
73 if (flags & FLAG_v) {
74 char *s = dirtree_path(try, 0);
75 printf("%s%s '%s'\n", toys.which->name, dir ? "dir" : "", s);
76 free(s);
77 }
78 } else {
79 if (!dir || try->symlink != (char *)2) perror_msg_raw(try->name);
80 nodelete:
81 if (try->parent) try->parent->symlink = (char *)2;
82 }
83
84 return 0;
85 }
86
rm_main(void)87 void rm_main(void)
88 {
89 char **s;
90
91 // Can't use <1 in optstring because zero arguments with -f isn't an error
92 if (!toys.optc && !(toys.optflags & FLAG_f)) error_exit("Needs 1 argument");
93
94 for (s = toys.optargs; *s; s++) {
95 if (!strcmp(*s, "/")) {
96 error_msg("rm /. if you mean it");
97 continue;
98 }
99
100 // Files that already don't exist aren't errors for -f, so try a quick
101 // unlink now to see if it succeeds or reports that it didn't exist.
102 if ((toys.optflags & FLAG_f) && (!unlink(*s) || errno == ENOENT))
103 continue;
104
105 // There's a race here where a file removed between the above check and
106 // dirtree's stat would report the nonexistence as an error, but that's
107 // not a normal "it didn't exist" so I'm ok with it.
108
109 dirtree_read(*s, do_rm);
110 }
111 }
112