Add mount(8)

Makefile

@@ -23,6 +23,7 @@ SRC += \
 	insmod.c            \
 	lsmod.c             \
 	mkswap.c            \
+	mount.c             \
 	reboot.c            \
 	rmmod.c             \
 	swapoff.c           \

mount.c

@@ -0,0 +1,123 @@
+/* See LICENSE file for copyright and license details. */
+#include <sys/mount.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "ubase.h"
+#include "util.h"
+
+struct {
+	const char *opt;
+	const char *notopt;
+	unsigned long v;
+} optnames[] = {
+	{ "remount",	NULL,		MS_REMOUNT },
+	{ "ro",		"rw",		MS_RDONLY },
+	{ "sync",	"async",	MS_SYNCHRONOUS },
+	{ "dirsync",	NULL,		MS_DIRSYNC },
+	{ "nodev",	"dev",		MS_NODEV },
+	{ "noatime",	"atime",	MS_NOATIME },
+	{ "nodiratime",	"diratime",	MS_NODIRATIME },
+	{ "noexec",	"exec",		MS_NOEXEC },
+	{ "nosuid",	"suid",		MS_NOSUID },
+	{ "mand",	"nomand",	MS_MANDLOCK },
+	{ "relatime",	"norelatime",	MS_RELATIME },
+	{ NULL,		NULL,		0 }
+};
+
+static void
+usage(void)
+{
+	eprintf("usage: %s [-BMRd] [-t fstype] [-o options] device dir\n",
+		argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int i;
+	unsigned long flags = 0;
+	char *types = NULL, *opt = NULL, *p;
+	const char *source;
+	const char *target;
+	int validopt;
+	void *data = NULL;
+	struct mntinfo *minfo = NULL;
+	int siz;
+
+	ARGBEGIN {
+	case 'B':
+		flags |= MS_BIND;
+		break;
+	case 'M':
+		flags |= MS_MOVE;
+		break;
+	case 'R':
+		flags |= MS_REC;
+		break;
+	case 'd':
+		data = EARGF(usage());
+		break;
+	case 'o':
+		opt = EARGF(usage());
+		p = strtok(opt, ",");
+		while (p) {
+			validopt = 0;
+			for (i = 0; optnames[i].v; i++) {
+				if (optnames[i].opt) {
+					if (!strcmp(p, optnames[i].opt)) {
+						flags |= optnames[i].v;
+						validopt = 1;
+						break;
+					}
+				}
+				if (optnames[i].notopt) {
+					if (!strcmp(p, optnames[i].notopt)) {
+						flags &= ~optnames[i].v;
+						validopt = 1;
+						break;
+					}
+				}
+			}
+			if (!validopt)
+				break;
+			p = strtok(NULL, ",");
+		}
+		if (!validopt)
+			enprintf(1, "unknown option: %s\n", p);
+		break;
+	case 't':
+		types = EARGF(usage());
+		break;
+	default:
+		usage();
+	} ARGEND;
+
+	if (argc < 1)
+		usage();
+
+	source = argv[0];
+	target = argv[1];
+
+	if (!target) {
+		target = source;
+		source = NULL;
+		siz = grabmntinfo(&minfo);
+		if (!siz)
+			eprintf("grabmntinfo:");
+		for (i = 0; i < siz; i++)
+			if (!strcmp(minfo[i].mntdir, target))
+				source = minfo[i].fsname;
+		if (!source)
+			enprintf(1, "can't find %s mountpoint\n",
+				 target);
+	}
+
+	if (mount(source, target, types, flags, data) < 0)
+		eprintf("mount:");
+
+	free(minfo);
+
+	return 0;
+}