FUSE!!

2 files changed, 191 insertions, 6 deletions

diff --git a/makefile b/makefile
index 899ffb8..dd02100 100644
--- a/makefile
+++ b/makefile
@@ -7,13 +7,15 @@ SU = sudo
 TG = ctags
 
 BUILD = $(PWD)/build
+MNT = $(PWD)/mnt
 SRC = ./src
 INC = ./inc
 SRCS = $(shell find $(SRC) -type f -name '*.c')
 OBJS = $(SRCS:%=$(BUILD)/%.o)
 
-CFLAGS_WARNINGS = -Wall -Wextra -Wshadow -Wpointer-arith -Wwrite-strings -Wredundant-decls -Wnested-externs -Wformat=2 -Wmissing-declarations -Wstrict-prototypes -Wmissing-prototypes -Wcast-qual -Wswitch-default -Wswitch-enum -Wunreachable-code -Wundef -Wold-style-definition -Wvla -pedantic-errors
-CFLAGS = $(CFLAGS_WARNINGS) -std=c99 -fno-profile-generate -fno-omit-frame-pointer -fno-common -fno-asynchronous-unwind-tables -mno-red-zone -Ofast -I$(INC)
+CFLAGS_DEBUG = -Wno-error -Wno-unused -fsanitize=address -fsanitize=undefined -fstack-protector-all
+CFLAGS_WARNINGS = -Wall -Wextra -Werror -Wshadow -Wpointer-arith -Wwrite-strings -Wredundant-decls -Wnested-externs -Wformat=2 -Wmissing-declarations -Wstrict-prototypes -Wmissing-prototypes -Wcast-qual -Wswitch-default -Wswitch-enum -Wunreachable-code -Wundef -Wold-style-definition -Wvla -pedantic-errors
+CFLAGS = $(CFLAGS_WARNINGS) -std=c11 -fno-profile-generate -fno-omit-frame-pointer -fno-common -fno-asynchronous-unwind-tables -mno-red-zone -Ofast -D_DEFAULT_SOURCE -I$(INC) $(shell pkg-config fuse3 --cflags --libs) $(CFLAGS_DEBUG)
 
 all: $(BUILD) $(OBJS)
 
@@ -25,7 +27,7 @@ clean:
 clean_disk:
 	@rm -rf $(BUILD)/*.img
 
-run: compile $(BUILD) clean_disk $(BUILD)/disk.img
+run: mount
 
 sync: # Ugly hack
 	@$(MAKE) --always-make --dry-run | grep -wE 'gcc' | jq -nR '[inputs|{directory: ".", command: ., file: match(" [^ ]+$$").string[1:]}]' >compile_commands.json &
@@ -34,15 +36,32 @@ sync: # Ugly hack
 $(BUILD)/%.c.o: %.c
 	@$(CC) $(CFLAGS) $< -o $(patsubst $(BUILD)/$(SRC)/%.c.o,$(BUILD)/marfs_%,$@)
 
-.PHONY: all run compile clean clean_disk sync
+.PHONY: all run compile clean clean_disk sync mount umount
 
 $(BUILD):
 	@mkdir -p $@
 
-%.img: $(BUILD)
+$(MNT):
+	@mkdir -p $@
+
+mount: disk $(MNT)
+	@DEV=$$(losetup -a | grep $(BUILD)/disk.img | grep -m 1 -o '/dev/loop[[:digit:]]*') && \
+	PART="p1" && \
+	$(BUILD)/marfs_fuse "$$DEV$$PART" $(MNT) && \
+	echo "Mounted $$DEV$$PART"
+
+umount:
+	@DEV=$$(losetup -a | grep $(BUILD)/disk.img | grep -m 1 -o '/dev/loop[[:digit:]]*') && \
+	umount $(MNT) && \
+	$(SU) losetup -d "$$DEV" && \
+	echo "Unmounted $$DEV$$PART" || \
+	echo "No disk to unmount"
+
+disk: $(BUILD)/disk.img
+%.img: compile clean_disk $(BUILD)
 	@dd if=/dev/zero of=$@ bs=1k count=32k status=none
 	@DEV=$$($(SU) losetup --find --partscan --show $@) && \
 	PART="p1" && \
 	$(SU) parted -s "$$DEV" mklabel msdos mkpart primary 32k 100% -a minimal set 1 boot on && \
 	$(SU) ./build/marfs_mkfs "$$DEV$$PART" && \
-	$(SU) losetup -d "$$DEV"
+	echo "Created $$DEV$$PART. Please run '$(MAKE) umount' afterwards"
diff --git a/src/fuse.c b/src/fuse.c
new file mode 100644
index 0000000..262317a
--- /dev/null
+++ b/src/fuse.c
@@ -0,0 +1,166 @@
+/**
+ * Copyright (c) 2021, Marvin Borner <melvix@marvinborner.de>
+ * SPDX-License-Identifier: MIT
+ */
+
+#define FUSE_USE_VERSION 30
+
+#include <spec.h>
+
+#include <fuse.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+#include <time.h>
+
+static char *image = 0;
+
+static void marfs_debug(const char *fmt, ...)
+{
+	va_list args;
+	va_start(args, fmt);
+	vfprintf(stdout, fmt, args);
+	va_end(args);
+}
+
+static void *marfs_init(struct fuse_conn_info *conn, struct fuse_config *cfg)
+{
+	UNUSED(conn);
+	cfg->kernel_cache = 1;
+	return NULL;
+}
+
+static void marfs_destroy(void *data)
+{
+	if (image)
+		free(image);
+}
+
+static int marfs_open(const char *file_path, struct fuse_file_info *file_info)
+{
+	marfs_debug("opening file %s\n", file_path);
+	return 0;
+}
+
+static int marfs_opendir(const char *dir_path, struct fuse_file_info *file_info)
+{
+	marfs_debug("opening dir %s\n", dir_path);
+	return 0;
+}
+
+static int marfs_getattr(const char *path, struct stat *stat, struct fuse_file_info *info)
+{
+	marfs_debug("getattr() on %s\n", path);
+	return 0;
+}
+
+static int marfs_readdir(const char *path, void *buf, fuse_fill_dir_t fill, off_t offset,
+			 struct fuse_file_info *file_info, enum fuse_readdir_flags flags)
+{
+	marfs_debug("readdir() on %s and offset %lu\n", path, offset);
+	return 0;
+}
+
+static int marfs_release(const char *path, struct fuse_file_info *file_info)
+{
+	return 0;
+}
+
+static int marfs_releasedir(const char *path, struct fuse_file_info *file_info)
+{
+	return 0;
+}
+
+static int marfs_read(const char *path, char *buf, size_t to_read, off_t offset,
+		      struct fuse_file_info *file_info)
+{
+	marfs_debug("marfs_read() on %s, %lu\n", path, to_read);
+	return to_read;
+}
+
+static int marfs_write(const char *path, const char *buf, size_t to_write, off_t offset,
+		       struct fuse_file_info *file_info)
+{
+	marfs_debug("marfs_write() on %s\n", path);
+	return to_write;
+}
+
+static int marfs_create(const char *path, mode_t mode, struct fuse_file_info *file_info)
+{
+	marfs_debug("marfs_create() on %s\n", path);
+	return 0;
+}
+
+static int marfs_mkdir(const char *path, mode_t mode)
+{
+	marfs_debug("marfs_mkdir() on %s\n", path);
+	return 0;
+}
+
+static int marfs_unlink(const char *path)
+{
+	return 0;
+}
+
+static int marfs_rmdir(const char *path)
+{
+	return 0;
+}
+
+static int marfs_utimens(const char *path, const struct timespec tv[2],
+			 struct fuse_file_info *file_info)
+{
+	marfs_debug("marfs_utimens() on %s\n", path);
+	return 0;
+}
+
+static int marfs_truncate(const char *path, off_t size, struct fuse_file_info *file_info)
+{
+	marfs_debug("marfs_truncate() on %s, size %lu\n", path, size);
+	return 0;
+}
+
+static int marfs_rename(const char *path, const char *new, unsigned int flags)
+{
+	marfs_debug("marfs_rename() on %s, %s\n", path, new);
+	return 0;
+}
+
+static struct fuse_operations operations = {
+	.init = marfs_init,
+	.destroy = marfs_destroy,
+	.open = marfs_open,
+	.opendir = marfs_opendir,
+	.getattr = marfs_getattr,
+	.readdir = marfs_readdir,
+	.release = marfs_release,
+	.releasedir = marfs_releasedir,
+	.read = marfs_read,
+	.write = marfs_write,
+	.create = marfs_create,
+	.unlink = marfs_unlink,
+	.utimens = marfs_utimens,
+	.truncate = marfs_truncate,
+	.mkdir = marfs_mkdir,
+	.rmdir = marfs_rmdir,
+	.rename = marfs_rename,
+};
+
+int main(int argc, char **argv)
+{
+	if (argc < 2) {
+		fprintf(stderr, "error: no image specified\n");
+		exit(1);
+	}
+
+	// I don't think that's how fuse is supposed to work but idc
+	image = strdup(argv[1]);
+	argv++;
+	argc--;
+
+	fuse_main(argc, argv, &operations, NULL);
+
+	return 0;
+}