Adding upstream version 2.39.3.upstream/2.39.3

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 219 insertions, 0 deletions

diff --git a/sys-utils/mountpoint.c b/sys-utils/mountpoint.c
new file mode 100644
index 0000000..b9904f3
--- /dev/null
+++ b/sys-utils/mountpoint.c
@@ -0,0 +1,219 @@
+/*
+ * mountpoint(1) - see if a directory is a mountpoint
+ *
+ * This is libmount based reimplementation of the mountpoint(1)
+ * from sysvinit project.
+ *
+ *
+ * Copyright (C) 2011 Red Hat, Inc. All rights reserved.
+ * Written by Karel Zak <kzak@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <getopt.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <libmount.h>
+
+#include "nls.h"
+#include "xalloc.h"
+#include "c.h"
+#include "closestream.h"
+#include "pathnames.h"
+
+#define MOUNTPOINT_EXIT_NOMNT	32
+
+struct mountpoint_control {
+	char *path;
+	dev_t dev;
+	struct stat st;
+	unsigned int
+		dev_devno:1,
+		fs_devno:1,
+		nofollow:1,
+		quiet:1;
+};
+
+static int dir_to_device(struct mountpoint_control *ctl)
+{
+	struct libmnt_table *tb = mnt_new_table_from_file(_PATH_PROC_MOUNTINFO);
+	struct libmnt_fs *fs;
+	struct libmnt_cache *cache;
+	int rc = -1;
+
+	if (!tb) {
+		/*
+		 * Fallback. Traditional way to detect mountpoints. This way
+		 * is independent on /proc, but not able to detect bind mounts.
+		 */
+		struct stat pst;
+		char buf[PATH_MAX], *cn;
+		int len;
+
+		cn = mnt_resolve_path(ctl->path, NULL);	/* canonicalize */
+
+		len = snprintf(buf, sizeof(buf), "%s/..", cn ? cn : ctl->path);
+		free(cn);
+
+		if (len < 0 || (size_t) len >= sizeof(buf))
+			return -1;
+		if (stat(buf, &pst) !=0)
+			return -1;
+
+		if (ctl->st.st_dev != pst.st_dev || ctl->st.st_ino == pst.st_ino) {
+			ctl->dev = ctl->st.st_dev;
+			return 0;
+		}
+
+		return -1;
+	}
+
+	/* to canonicalize all necessary paths */
+	cache = mnt_new_cache();
+	mnt_table_set_cache(tb, cache);
+	mnt_unref_cache(cache);
+
+	fs = mnt_table_find_target(tb, ctl->path, MNT_ITER_BACKWARD);
+	if (fs && mnt_fs_get_target(fs)) {
+		ctl->dev = mnt_fs_get_devno(fs);
+		rc = 0;
+	}
+
+	mnt_unref_table(tb);
+	return rc;
+}
+
+static int print_devno(const struct mountpoint_control *ctl)
+{
+	if (!S_ISBLK(ctl->st.st_mode)) {
+		if (!ctl->quiet)
+			warnx(_("%s: not a block device"), ctl->path);
+		return -1;
+	}
+	printf("%u:%u\n", major(ctl->st.st_rdev), minor(ctl->st.st_rdev));
+	return 0;
+}
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+	FILE *out = stdout;
+	fputs(USAGE_HEADER, out);
+	fprintf(out,
+	      _(" %1$s [-qd] /path/to/directory\n"
+		" %1$s -x /dev/device\n"), program_invocation_short_name);
+
+	fputs(USAGE_SEPARATOR, out);
+	fputs(_("Check whether a directory or file is a mountpoint.\n"), out);
+
+	fputs(USAGE_OPTIONS, out);
+	fputs(_(" -q, --quiet        quiet mode - don't print anything\n"
+		"     --nofollow     do not follow symlink\n"
+		" -d, --fs-devno     print maj:min device number of the filesystem\n"
+		" -x, --devno        print maj:min device number of the block device\n"), out);
+	fputs(USAGE_SEPARATOR, out);
+	printf(USAGE_HELP_OPTIONS(20));
+	printf(USAGE_MAN_TAIL("mountpoint(1)"));
+
+	exit(EXIT_SUCCESS);
+}
+
+int main(int argc, char **argv)
+{
+	int c;
+	struct mountpoint_control ctl = { NULL };
+
+	enum {
+		OPT_NOFOLLOW = CHAR_MAX + 1
+	};
+
+	static const struct option longopts[] = {
+		{ "quiet",    no_argument, NULL, 'q' },
+		{ "nofollow", no_argument, NULL, OPT_NOFOLLOW },
+		{ "fs-devno", no_argument, NULL, 'd' },
+		{ "devno",    no_argument, NULL, 'x' },
+		{ "help",     no_argument, NULL, 'h' },
+		{ "version",  no_argument, NULL, 'V' },
+		{ NULL, 0, NULL, 0 }
+	};
+
+	setlocale(LC_ALL, "");
+	bindtextdomain(PACKAGE, LOCALEDIR);
+	textdomain(PACKAGE);
+	close_stdout_atexit();
+
+	mnt_init_debug(0);
+
+	while ((c = getopt_long(argc, argv, "qdxhV", longopts, NULL)) != -1) {
+
+		switch(c) {
+		case 'q':
+			ctl.quiet = 1;
+			break;
+		case OPT_NOFOLLOW:
+			ctl.nofollow = 1;
+			break;
+		case 'd':
+			ctl.fs_devno = 1;
+			break;
+		case 'x':
+			ctl.dev_devno = 1;
+			break;
+
+		case 'h':
+			usage();
+		case 'V':
+			print_version(EXIT_SUCCESS);
+		default:
+			errtryhelp(EXIT_FAILURE);
+		}
+	}
+
+	if (optind + 1 != argc) {
+		warnx(_("bad usage"));
+		errtryhelp(EXIT_FAILURE);
+	}
+	if (ctl.nofollow && ctl.dev_devno)
+		errx(EXIT_FAILURE, _("%s and %s are mutually exclusive"),
+		     "--devno", "--nofollow");
+
+	ctl.path = argv[optind];
+	c = ctl.nofollow ? lstat(ctl.path, &ctl.st) : stat(ctl.path, &ctl.st);
+	if (c) {
+		if (!ctl.quiet)
+			err(EXIT_FAILURE, "%s", ctl.path);
+		return EXIT_FAILURE;
+	}
+	if (ctl.dev_devno)
+		return print_devno(&ctl) ? MOUNTPOINT_EXIT_NOMNT : EXIT_SUCCESS;
+
+	if ((ctl.nofollow && S_ISLNK(ctl.st.st_mode)) || dir_to_device(&ctl)) {
+		if (!ctl.quiet)
+			printf(_("%s is not a mountpoint\n"), ctl.path);
+		return MOUNTPOINT_EXIT_NOMNT;
+	}
+	if (ctl.fs_devno)
+		printf("%u:%u\n", major(ctl.dev), minor(ctl.dev));
+	else if (!ctl.quiet)
+		printf(_("%s is a mountpoint\n"), ctl.path);
+
+	return EXIT_SUCCESS;
+}