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), 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
74 skip:
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);
83 nodelete:
84 if (try->parent) try->parent->symlink = (char *)2;
85 }
86
87 return 0;
88 }
89
rm_main(void)90 void 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, so try a quick
109 // unlink now to see if it succeeds or reports that it didn't exist.
110 if (FLAG(f) && (!unlink(*s) || 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
116 dirtree_read(*s, do_rm);
117 }
118 }
119