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 if (!(dir && try->again) && ((or && isatty(0)) || FLAG(i))) {
41 char *s = dirtree_path(try, 0);
42
43 fprintf(stderr, "rm %s%s%s", or ? "ro " : "", dir ? "dir " : "", s);
44 free(s);
45 or = yesno(0);
46 if (!or) goto nodelete;
47 }
48
49 // handle directory recursion
50 if (dir) {
51 using = AT_REMOVEDIR;
52 // Handle chmod 000 directories when -f
53 if (faccessat(fd, try->name, R_OK, 0)) {
54 if (FLAG(f)) wfchmodat(fd, try->name, 0700);
55 else goto skip;
56 }
57 if (!try->again) return DIRTREE_COMEAGAIN;
58 if (try->symlink) goto skip;
59 if (FLAG(i)) {
60 char *s = dirtree_path(try, 0);
61
62 // This is the section 2(d) prompt. (Yes, posix says to prompt twice.)
63 fprintf(stderr, "rmdir %s", s);
64 free(s);
65 or = yesno(0);
66 if (!or) goto nodelete;
67 }
68 }
69
70 skip:
71 if (!unlinkat(fd, try->name, using)) {
72 if (FLAG(v)) {
73 char *s = dirtree_path(try, 0);
74 printf("%s%s '%s'\n", toys.which->name, dir ? "dir" : "", s);
75 free(s);
76 }
77 } else {
78 if (!dir || try->symlink != (char *)2) perror_msg_raw(try->name);
79 nodelete:
80 if (try->parent) try->parent->symlink = (char *)2;
81 }
82
83 return 0;
84 }
85
rm_main(void)86 void rm_main(void)
87 {
88 char **s;
89
90 // Can't use <1 in optstring because zero arguments with -f isn't an error
91 if (!toys.optc && !FLAG(f)) help_exit("Needs 1 argument");
92
93 for (s = toys.optargs; *s; s++) {
94 if (!strcmp(*s, "/")) {
95 error_msg("rm /. if you mean it");
96 continue;
97 }
98
99 // Files that already don't exist aren't errors for -f, so try a quick
100 // unlink now to see if it succeeds or reports that it didn't exist.
101 if (FLAG(f) && (!unlink(*s) || errno == ENOENT)) continue;
102
103 // There's a race here where a file removed between the above check and
104 // dirtree's stat would report the nonexistence as an error, but that's
105 // not a normal "it didn't exist" so I'm ok with it.
106
107 dirtree_read(*s, do_rm);
108 }
109 }
110