bootstrap-initrd

commit: 09a8aedbd5f3ca21ebd271b4b90118a14f9e8d94
parent 33df680666854a4cddcf6e2f6822ef31e33bec30
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Mon, 20 May 2024 22:06:29 +0200

mount-stub.c: Add

Diffstat:
M
init.sh
2
+-
M
make-root.sh
1
+
A
mount-stub.c
87
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

3 files changed, 89 insertions(+), 1 deletion(-)
diff --git a/init.sh b/init.sh
@@ -26,7 +26,7 @@ build_awk() {
 }
 
 build_stubs() {
-	for i in ls grep cp getty
+	for i in ls grep cp getty mount
 	do
 		$CC $CFLAGS -o "/bin/$i" "/${i}-stub.c" || die "Failed compiling $i stub"
 	done
diff --git a/make-root.sh b/make-root.sh
@@ -40,6 +40,7 @@ local_files="
 	grep-stub.c
 	cp-stub.c
 	getty-stub.c
+	mount-stub.c
 	bootstrap-bash.sh
 	bootstrap-make.sh
 	bootstrap-xz.sh
diff --git a/mount-stub.c b/mount-stub.c
@@ -0,0 +1,87 @@
+// SPDX-FileCopyrightText: 2017 Haelwenn (lanodan) Monnier <contact+utils@hacktivis.me>
+// SPDX-License-Identifier: MPL-2.0
+#define _GNU_SOURCE
+
+#include <errno.h>
+#include <getopt.h>    // getopt_long
+#include <stdio.h>     // fprintf
+#include <string.h>    // strerror
+#include <sys/mount.h> // mount
+
+static void
+usage()
+{
+	fprintf(stderr, "\
+Usage: mount [-t fstype] device mountpoint\n\
+       mount [--bind|--rbind|--move] source destination\n\
+");
+}
+
+int
+main(int argc, char *argv[])
+{
+	char *fstype = NULL;
+	int mnt_flags = 0;
+	int opt_bind_move = 0;
+	struct option longopts[] = {
+	    /* options exclusive to another, so mnt_flags can be set directly */
+	    {"bind", no_argument, &opt_bind_move, MS_BIND},
+	    {"rbind", no_argument, &opt_bind_move, MS_BIND | MS_REC},
+	    {"move", no_argument, &opt_bind_move, MS_MOVE},
+	};
+
+	int c = -1;
+	while((c = getopt_long(argc, argv, ":t:", longopts, NULL)) != -1)
+	{
+		switch(c)
+		{
+		case 0:
+			break;
+		case 't':
+			fstype = optarg;
+			break;
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if(opt_bind_move != 0)
+	{
+		if(argc != 2)
+		{
+			fprintf(stderr, "mount: Expected 2 arguments, got %d\n", argc);
+			usage();
+			return 1;
+		}
+		char *src = argv[0];
+		char *dest = argv[1];
+
+		int ret = mount(src, dest, NULL, opt_bind_move, NULL);
+		if(ret != 0)
+		{
+			fprintf(stderr, "mount: Failed mounting %s to %s: %s\n", src, dest, strerror(errno));
+			return 1;
+		}
+
+		return 0;
+	}
+
+	if(argc != 2)
+	{
+		fprintf(stderr, "mount: Expected 2 arguments, got %d\n", argc);
+		usage();
+		return 1;
+	}
+	char *src = argv[0];
+	char *dest = argv[1];
+
+	int ret = mount(src, dest, fstype, mnt_flags, NULL);
+	if(ret != 0)
+	{
+		fprintf(stderr, "mount: Failed mounting %s to %s: %s\n", src, dest, strerror(errno));
+		return 1;
+	}
+
+	return 0;
+}