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annotate toys/chgrp.c @ 544:f11693d78764

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New toys - chmod, chown, and chgrp.
author Georgi Chorbadzhiyski <gf@unixsol.org>
date Tue, 13 Mar 2012 21:05:12 -0500
parents
children 4a91ede70548
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rev   line source
544
f11693d78764 New toys - chmod, chown, and chgrp.
Georgi Chorbadzhiyski <gf@unixsol.org>
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1 /* vi: set sw=4 ts=4:
f11693d78764 New toys - chmod, chown, and chgrp.
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2 *
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3 * chgrp.c - Change group ownership
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4 *
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5 * Copyright 2012 Georgi Chorbadzhiyski <georgi@unixsol.org>
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6 *
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7 * See http://pubs.opengroup.org/onlinepubs/009695399/utilities/chgrp.html
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8 *
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9 * TODO: Add support for -h
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10 * TODO: Add support for -H
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11 * TODO: Add support for -L
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12 * TODO: Add support for -P
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13
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14 USE_CHGRP(NEWTOY(chgrp, "<2Rfv", TOYFLAG_BIN))
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15
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16 config CHGRP
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17 bool "chgrp"
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18 default y
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19 help
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20 usage: chgrp [-R] [-f] [-v] group file...
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21 Change group ownership of one or more files.
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22
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23 -R recurse into subdirectories.
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24 -f suppress most error messages.
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25 -v verbose output.
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26 */
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27
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28 #include "toys.h"
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29
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30 #define FLAG_R 4
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31 #define FLAG_f 2
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32 #define FLAG_v 1
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33
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34 DEFINE_GLOBALS(
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35 gid_t group;
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36 char *group_name;
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37 )
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38
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39 #define TT this.chgrp
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40
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41 static int do_chgrp(const char *path) {
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42 int ret = chown(path, -1, TT.group);
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43 if (toys.optflags & FLAG_v)
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44 xprintf("chgrp(%s, %s)\n", TT.group_name, path);
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45 if (ret == -1 && !(toys.optflags & FLAG_f))
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46 perror_msg("changing group of '%s' to '%s'", path, TT.group_name);
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47 toys.exitval |= ret;
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48 return ret;
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49 }
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50
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51 // Copied from toys/cp.c:cp_node()
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52 int chgrp_node(char *path, struct dirtree *node)
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53 {
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54 char *s = path + strlen(path);
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55 struct dirtree *n = node;
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56
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57 for ( ; ; n = n->parent) {
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58 while (s!=path) {
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59 if (*(--s) == '/') break;
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60 }
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61 if (!n) break;
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62 }
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63 if (s != path) s++;
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64
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65 do_chgrp(s);
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66
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67 return 0;
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68 }
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69
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70 void chgrp_main(void)
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71 {
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72 char **s;
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73 struct group *group;
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74
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75 TT.group_name = *toys.optargs;
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76 group = getgrnam(TT.group_name);
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77 if (!group) {
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78 error_msg("invalid group '%s'", TT.group_name);
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79 toys.exitval = 1;
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80 return;
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81 }
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82 TT.group = group->gr_gid;
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83
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84 if (toys.optflags & FLAG_R) {
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85 // Recurse into subdirectories
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86 for (s=toys.optargs + 1; *s; s++) {
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87 struct stat sb;
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88 if (stat(*s, &sb) == -1) {
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89 if (!(toys.optflags & FLAG_f))
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90 perror_msg("stat '%s'", *s);
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91 continue;
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92 }
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93 do_chgrp(*s);
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94 if (S_ISDIR(sb.st_mode)) {
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95 strncpy(toybuf, *s, sizeof(toybuf) - 1);
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96 toybuf[sizeof(toybuf) - 1] = 0;
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97 dirtree_read(toybuf, NULL, chgrp_node);
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98 }
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99 }
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100 } else {
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101 // Do not recurse
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102 for (s=toys.optargs + 1; *s; s++) {
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103 do_chgrp(*s);
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104 }
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105 }
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106 }