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annotate toys/posix/rm.c @ 739:451d7e91232e

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Complicate the rm -i behavior to do what posix specifies.
author Rob Landley <rob@landley.net>
date Sat, 08 Dec 2012 02:26:56 -0600
parents dc4a38a13270
children 5caa4035c1c8
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1 /* rm.c - remove files
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2 *
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3 * Copyright 2012 Rob Landley <rob@landley.net>
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4 *
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5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/rm.html
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6
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7 USE_RM(NEWTOY(rm, "<1fiRr[-fi]", TOYFLAG_BIN))
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8
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9 config RM
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10 bool "rm"
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11 default y
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12 help
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13 usage: rm [-fiRr] FILE...
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14
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15 Remove each argument from the filesystem.
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16
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17 -f force: remove without confirmation, no error if it doesn't exist
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18 -i interactive: prompt for confirmation
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19 -rR recursive: remove directory contents
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20 */
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21
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22 #define FOR_rm
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23 #include "toys.h"
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24
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25 static int do_rm(struct dirtree *try)
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26 {
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27 int fd = dirtree_parentfd(try), flags = toys.optflags;
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28 int dir = S_ISDIR(try->st.st_mode), or = 0, using = 0;
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29
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30 // Skip . and .. (yes, even explicitly on the command line: posix says to)
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31 if (!dirtree_notdotdot(try)) return 0;
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32
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33 // Intentionally fail non-recursive attempts to remove even an empty dir
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34 // (via wrong flags to unlinkat) because POSIX says to.
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35 if (dir && !(flags & (FLAG_r|FLAG_R))) goto skip;
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36
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37 // This is either the posix section 2(b) prompt or the section 3 prompt.
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38 if (!(flags & FLAG_f) && faccessat(fd, try->name, W_OK, AT_SYMLINK_NOFOLLOW))
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39 or++;
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40 if (!(dir && try->data == -1) && ((or && isatty(0)) || (flags & FLAG_i))) {
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41 char *s = dirtree_path(try, 0);
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42 fprintf(stderr, "rm %s%s", or ? "ro " : "", dir ? "dir " : "");
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43 or = yesno(s, 0);
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44 free(s);
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45 if (!or) goto nodelete;
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46 }
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47
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48 // handle directory recursion
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49 if (dir) {
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50
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51 if (try->data != -1) return DIRTREE_COMEAGAIN;
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52 using = AT_REMOVEDIR;
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53 if (try->symlink) goto nodelete;
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54 if (flags & FLAG_i) {
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55 char *s = dirtree_path(try, 0);
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56 // This is the section 2(d) prompt. (Yes, posix says to prompt twice.)
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57 fprintf(stderr, "rmdir ");
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58 or = yesno(s, 0);
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59 free(s);
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60 if (!or) goto nodelete;
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61 }
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62 }
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63
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64 skip:
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65 if (unlinkat(fd, try->name, using)) {
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66 perror_msg("%s", try->name);
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67 toys.exitval = 1;
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68 nodelete:
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69 if (try->parent) try->parent->symlink = (char *)1;
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70 }
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71
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72 return 0;
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73 }
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74
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75 void rm_main(void)
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76 {
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77 char **s;
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78
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79 for (s = toys.optargs; *s; s++) {
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80 if (!strcmp(*s, "/")) {
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81 error_msg("rm /. if you mean it");
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82 toys.exitval = 1;
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83 continue;
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84 }
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85
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86 // There's a race here where a file removed between this access and
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87 // dirtree's stat would report the nonexistence as an error, but that's
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88 // not a normal "it didn't exist" so I'm ok with it.
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89 if ((toys.optflags & FLAG_f) && (access(*s, F_OK) && errno == ENOENT))
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90 continue;
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91 dirtree_read(*s, do_rm);
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92 }
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93 }