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, "fiRr[-fi]", TOYFLAG_BIN))
8
9 config 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
do_rm(struct dirtree * try)25 static 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->again) && ((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 using = AT_REMOVEDIR;
51 // Handle chmod 000 directories when -f
52 if (faccessat(fd, try->name, R_OK, 0)) {
53 if (toys.optflags & FLAG_f) wfchmodat(fd, try->name, 0700);
54 else goto skip;
55 }
56 if (!try->again) return DIRTREE_COMEAGAIN;
57 if (try->symlink) goto skip;
58 if (flags & FLAG_i) {
59 char *s = dirtree_path(try, 0);
60 // This is the section 2(d) prompt. (Yes, posix says to prompt twice.)
61 fprintf(stderr, "rmdir ");
62 or = yesno(s, 0);
63 free(s);
64 if (!or) goto nodelete;
65 }
66 }
67
68 skip:
69 if (unlinkat(fd, try->name, using)) {
70 if (!dir || try->symlink != (char *)2) perror_msg("%s", try->name);
71 nodelete:
72 if (try->parent) try->parent->symlink = (char *)2;
73 }
74
75 return 0;
76 }
77
rm_main(void)78 void rm_main(void)
79 {
80 char **s;
81
82 // Can't use <1 in optstring because zero arguments with -f isn't an error
83 if (!toys.optc && !(toys.optflags & FLAG_f)) error_exit("Needs 1 argument");
84
85 for (s = toys.optargs; *s; s++) {
86 if (!strcmp(*s, "/")) {
87 error_msg("rm /. if you mean it");
88 continue;
89 }
90
91 // Files that already don't exist aren't errors for -f, so try a quick
92 // unlink now to see if it succeeds or reports that it didn't exist.
93 if ((toys.optflags & FLAG_f) && (!unlink(*s) || errno == ENOENT))
94 continue;
95
96 // There's a race here where a file removed between the above check and
97 // dirtree's stat would report the nonexistence as an error, but that's
98 // not a normal "it didn't exist" so I'm ok with it.
99
100 dirtree_read(*s, do_rm);
101 }
102 }
103