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-rw-r--r--toys/chgrp.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/toys/chgrp.c b/toys/chgrp.c
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+/* vi: set sw=4 ts=4:
+ *
+ * chgrp.c - Change group ownership
+ *
+ * Copyright 2012 Georgi Chorbadzhiyski <georgi@unixsol.org>
+ *
+ * See http://pubs.opengroup.org/onlinepubs/009695399/utilities/chgrp.html
+ *
+ * TODO: Add support for -h
+ * TODO: Add support for -H
+ * TODO: Add support for -L
+ * TODO: Add support for -P
+
+USE_CHGRP(NEWTOY(chgrp, "<2Rfv", TOYFLAG_BIN))
+
+config CHGRP
+ bool "chgrp"
+ default y
+ help
+ usage: chgrp [-R] [-f] [-v] group file...
+ Change group ownership of one or more files.
+
+ -R recurse into subdirectories.
+ -f suppress most error messages.
+ -v verbose output.
+*/
+
+#include "toys.h"
+
+#define FLAG_R 4
+#define FLAG_f 2
+#define FLAG_v 1
+
+DEFINE_GLOBALS(
+ gid_t group;
+ char *group_name;
+)
+
+#define TT this.chgrp
+
+static int do_chgrp(const char *path) {
+ int ret = chown(path, -1, TT.group);
+ if (toys.optflags & FLAG_v)
+ xprintf("chgrp(%s, %s)\n", TT.group_name, path);
+ if (ret == -1 && !(toys.optflags & FLAG_f))
+ perror_msg("changing group of '%s' to '%s'", path, TT.group_name);
+ toys.exitval |= ret;
+ return ret;
+}
+
+// Copied from toys/cp.c:cp_node()
+int chgrp_node(char *path, struct dirtree *node)
+{
+ char *s = path + strlen(path);
+ struct dirtree *n = node;
+
+ for ( ; ; n = n->parent) {
+ while (s!=path) {
+ if (*(--s) == '/') break;
+ }
+ if (!n) break;
+ }
+ if (s != path) s++;
+
+ do_chgrp(s);
+
+ return 0;
+}
+
+void chgrp_main(void)
+{
+ char **s;
+ struct group *group;
+
+ TT.group_name = *toys.optargs;
+ group = getgrnam(TT.group_name);
+ if (!group) {
+ error_msg("invalid group '%s'", TT.group_name);
+ toys.exitval = 1;
+ return;
+ }
+ TT.group = group->gr_gid;
+
+ if (toys.optflags & FLAG_R) {
+ // Recurse into subdirectories
+ for (s=toys.optargs + 1; *s; s++) {
+ struct stat sb;
+ if (stat(*s, &sb) == -1) {
+ if (!(toys.optflags & FLAG_f))
+ perror_msg("stat '%s'", *s);
+ continue;
+ }
+ do_chgrp(*s);
+ if (S_ISDIR(sb.st_mode)) {
+ strncpy(toybuf, *s, sizeof(toybuf) - 1);
+ toybuf[sizeof(toybuf) - 1] = 0;
+ dirtree_read(toybuf, NULL, chgrp_node);
+ }
+ }
+ } else {
+ // Do not recurse
+ for (s=toys.optargs + 1; *s; s++) {
+ do_chgrp(*s);
+ }
+ }
+}