[RFC PATCH 24/28] lkl tools: tool that reads/writes to/from a filesystem image

[Octavian Purdila]

Signed-off-by: Octavian Purdila <octavian.purdila@xxxxxxxxx>
---
 tools/lkl/.gitignore |   2 +
 tools/lkl/Makefile   |   6 +-
 tools/lkl/cptofs.c   | 467 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 474 insertions(+), 1 deletion(-)
 create mode 100644 tools/lkl/cptofs.c

diff --git a/tools/lkl/.gitignore b/tools/lkl/.gitignore
index a345a79..1048323 100644
--- a/tools/lkl/.gitignore
+++ b/tools/lkl/.gitignore
@@ -1,2 +1,4 @@
 test/boot
 fs2tar
+cptofs
+cpfromfs
diff --git a/tools/lkl/Makefile b/tools/lkl/Makefile
index 9aeab49..4084609 100644
--- a/tools/lkl/Makefile
+++ b/tools/lkl/Makefile
@@ -12,11 +12,13 @@ ifneq (,$(filter $(shell $(LD) -r -print-output-format),elf64-x86-64 elf32-i386)
 source += $(wildcard *.c)
 lib_source += lib/posix-host.c
 LDFLAGS += -lpthread -lrt
+source += $(wildcard *.c)
+execs =  cpfromfs
 endif
 
 lib_objs = $(patsubst %.c,%.o, $(lib_source)) lib/lkl.o
 objs = $(patsubst %.c,%.o, $(source))
-execs = $(patsubst %.c,%, $(source))
+execs += $(patsubst %.c,%, $(source))
 
 all: lib/liblkl.a $(execs)
 
@@ -38,3 +40,5 @@ clean:
 	-rm -rf include/lkl/ lib/liblkl.a $(lib_objs) $(objs) $(execs)
 
 fs2tar: LDFLAGS += -larchive
+cpfromfs: cptofs
+	if ! [ -e $@ ]; then ln -s $< $@; fi
diff --git a/tools/lkl/cptofs.c b/tools/lkl/cptofs.c
new file mode 100644
index 0000000..0017395
--- /dev/null
+++ b/tools/lkl/cptofs.c
@@ -0,0 +1,467 @@
+#include <stdio.h>
+#include <time.h>
+#include <argp.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <libgen.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <fnmatch.h>
+#undef st_atime
+#undef st_mtime
+#undef st_ctime
+#include <dirent.h>
+#include <lkl.h>
+#include <lkl_host.h>
+
+static const char doc_cptofs[] = "Copy files to a filesystem image";
+static const char doc_cpfromfs[] = "Copy files from a filesystem image";
+static const char args_doc_cptofs[] = "-t fstype -i fsimage path fs_path";
+static const char args_doc_cpfromfs[] = "-t fstype -i fsimage fs_path path";
+
+static struct argp_option options[] = {
+	{"enable-printk", 'p', 0, 0, "show Linux printks"},
+	{"filesystem-type", 't', "string", 0,
+	 "select filesystem type - mandatory"},
+	{"filesystem-image", 'i', "string", 0,
+	 "path to the filesystem image - mandatory"},
+	{"selinux", 's', "string", 0, "selinux attributes for destination"},
+	{0},
+};
+
+static struct cl_args {
+	int printk;
+	const char *fsimg_type;
+	const char *fsimg_path;
+	const char *src_path;
+	const char *dst_path;
+	const char *selinux;
+} cla;
+
+static int cptofs;
+
+static error_t parse_opt(int key, char *arg, struct argp_state *state)
+{
+	struct cl_args *cla = state->input;
+
+	switch (key) {
+	case 'p':
+		cla->printk = 1;
+		break;
+	case 't':
+		cla->fsimg_type = arg;
+		break;
+	case 'i':
+		cla->fsimg_path = arg;
+		break;
+	case 's':
+		cla->selinux = arg;
+		break;
+	case ARGP_KEY_ARG:
+		if (!cla->src_path) {
+			cla->src_path = arg;
+		} else if (!cla->dst_path) {
+			cla->dst_path = arg;
+		} else {
+			argp_usage(state);
+			return -1;
+		}
+		break;
+	case ARGP_KEY_END:
+		if (state->arg_num < 2 || !cla->fsimg_type || !cla->fsimg_path)
+			argp_usage(state);
+	default:
+		return ARGP_ERR_UNKNOWN;
+	}
+
+	return 0;
+}
+
+static struct argp argp_cptofs = {
+	.options = options,
+	.parser = parse_opt,
+	.args_doc = args_doc_cptofs,
+	.doc = doc_cptofs,
+};
+
+static struct argp argp_cpfromfs = {
+	.options = options,
+	.parser = parse_opt,
+	.args_doc = args_doc_cpfromfs,
+	.doc = doc_cpfromfs,
+};
+
+static int searchdir(const char *fs_path, const char *path, const char *match);
+
+static int open_src(const char *path)
+{
+	int fd;
+
+	if (cptofs)
+		fd = open(path, O_RDONLY, 0);
+	else
+		fd = lkl_sys_open(path, LKL_O_RDONLY, 0);
+
+	if (fd < 0)
+		fprintf(stderr, "unable to open file %s for reading: %s\n",
+			path, cptofs ? strerror(errno) : lkl_strerror(fd));
+
+	return fd;
+}
+
+static int open_dst(const char *path, int mode)
+{
+	int fd;
+
+	if (cptofs)
+		fd = lkl_sys_open(path, LKL_O_RDWR | LKL_O_TRUNC | LKL_O_CREAT,
+				  mode);
+	else
+		fd = open(path, O_RDWR | O_TRUNC | O_CREAT, mode);
+
+	if (fd < 0)
+		fprintf(stderr, "unable to open file %s for writing: %s\n",
+			path, cptofs ? lkl_strerror(fd) : strerror(errno));
+
+	if (cla.selinux && cptofs) {
+		int ret = lkl_sys_fsetxattr(fd, "security.selinux", cla.selinux,
+					    strlen(cla.selinux), 0);
+		if (ret)
+			fprintf(stderr, "unable to set selinux attribute on %s: %s\n",
+				path, lkl_strerror(ret));
+	}
+
+	return fd;
+}
+
+static int read_src(int fd, char *buf, int len)
+{
+	int ret;
+
+	if (cptofs)
+		ret = read(fd, buf, len);
+	else
+		ret = lkl_sys_read(fd, buf, len);
+
+	if (ret < 0)
+		fprintf(stderr, "error reading file: %s\n",
+			cptofs ? strerror(errno) : lkl_strerror(ret));
+
+	return ret;
+}
+
+static int write_dst(int fd, char *buf, int len)
+{
+	int ret;
+
+	if (cptofs)
+		ret = lkl_sys_write(fd, buf, len);
+	else
+		ret = write(fd, buf, len);
+
+	if (ret < 0)
+		fprintf(stderr, "error writing file: %s\n",
+			cptofs ? lkl_strerror(ret) : strerror(errno));
+
+	return ret;
+}
+
+static void close_src(int fd)
+{
+	if (cptofs)
+		close(fd);
+	else
+		lkl_sys_close(fd);
+}
+
+static void close_dst(int fd)
+{
+	if (cptofs)
+		lkl_sys_close(fd);
+	else
+		close(fd);
+}
+
+static int copy_file(const char *src, const char *dst, int mode)
+{
+	long len, to_write, wrote;
+	char buf[4096], *ptr;
+	int ret = 0;
+	int fd_src, fd_dst;
+
+	fd_src = open_src(src);
+	if (fd_src < 0)
+		return fd_src;
+
+	fd_dst = open_dst(dst, mode);
+	if (fd_dst < 0)
+		return fd_dst;
+
+	do {
+		len = read_src(fd_src, buf, sizeof(buf));
+
+		if (len > 0) {
+			ptr = buf;
+			to_write = len;
+			do {
+				wrote = write_dst(fd_dst, ptr, to_write);
+
+				if (wrote < 0) {
+					ret = wrote;
+					goto out;
+				}
+
+				to_write -= wrote;
+				ptr += len;
+
+			} while (to_write > 0);
+		}
+
+		if (len < 0)
+			ret = len;
+
+	} while (len > 0);
+
+out:
+	close_src(fd_src);
+	close_dst(fd_dst);
+
+	return ret;
+}
+
+static int stat_src(const char *path, int *type, int *mode)
+{
+	struct stat stat;
+	struct lkl_stat64 lkl_stat;
+	int ret;
+
+	if (cptofs) {
+		ret = lstat(path, &stat);
+		*type = stat.st_mode & S_IFMT;
+		*mode = stat.st_mode & ~S_IFMT;
+	} else {
+		ret = lkl_sys_lstat64(path, &lkl_stat);
+		*type = lkl_stat.st_mode & S_IFMT;
+		*mode = lkl_stat.st_mode & ~S_IFMT;
+	}
+
+	if (ret)
+		fprintf(stderr, "fsimg fstat64(%s) error: %s\n",
+			path, cptofs ? strerror(errno) : lkl_strerror(ret));
+
+	return ret;
+}
+
+static int mkdir_dst(const char *path, int mode)
+{
+	int ret;
+
+	if (cptofs) {
+		ret = lkl_sys_mkdir(path, mode);
+		if (ret == -LKL_EEXIST)
+			ret = 0;
+	} else {
+		ret = mkdir(path, mode);
+		if (ret < 0 && errno == EEXIST)
+			ret = 0;
+	}
+
+	if (ret)
+		fprintf(stderr, "unable to create directory %s: %s\n",
+			path, cptofs ? strerror(errno) : lkl_strerror(ret));
+
+	return ret;
+}
+
+static int do_entry(const char *_src, const char *_dst, const char *name)
+{
+	char src[PATH_MAX], dst[PATH_MAX];
+	int type, mode;
+	int ret;
+
+	snprintf(src, sizeof(src), "%s/%s", _src, name);
+	snprintf(dst, sizeof(dst), "%s/%s", _dst, name);
+
+	ret = stat_src(src, &type, &mode);
+
+	switch (type) {
+	case S_IFREG:
+	{
+		ret = copy_file(src, dst, mode);
+		break;
+	}
+	case S_IFDIR:
+		ret = mkdir_dst(dst, mode);
+		if (ret)
+			break;
+		ret = searchdir(src, dst, NULL);
+		break;
+	case S_IFLNK:
+	case S_IFSOCK:
+	case S_IFBLK:
+	case S_IFCHR:
+	case S_IFIFO:
+	default:
+		printf("skipping %s: unsupported entry type %d\n", src, type);
+	}
+
+	if (ret)
+		printf("error processing entry %s, aborting\n", src);
+
+	return ret;
+}
+
+static DIR *open_dir(const char *path)
+{
+	DIR *dir;
+	int err;
+
+	if (cptofs)
+		dir = opendir(path);
+	else
+		dir = (DIR *)lkl_opendir(path, &err);
+
+	if (!dir)
+		fprintf(stderr, "unable to open directory %s: %s\n",
+			path, cptofs ? strerror(errno) : lkl_strerror(err));
+	return dir;
+}
+
+static const char *read_dir(DIR *dir, const char *path)
+{
+	struct lkl_dir *lkl_dir = (struct lkl_dir *)dir;
+	const char *name = NULL;
+	const char *err = NULL;
+
+	if (cptofs) {
+		struct dirent *de = readdir(dir);
+
+		if (de)
+			name = de->d_name;
+	} else {
+		struct lkl_dirent64 *de = lkl_readdir(lkl_dir);
+
+		if (de)
+			name = de->d_name;
+	}
+
+	if (!name) {
+		if (cptofs) {
+			if (errno)
+				err = strerror(errno);
+		} else {
+			if (lkl_errdir(lkl_dir))
+				err = lkl_strerror(lkl_errdir(lkl_dir));
+		}
+	}
+
+	if (err)
+		fprintf(stderr, "error while reading directory %s: %s\n",
+			path, err);
+	return name;
+}
+
+static void close_dir(DIR *dir)
+{
+	if (cptofs)
+		closedir(dir);
+	else
+		lkl_closedir((struct lkl_dir *)dir);
+}
+
+static int searchdir(const char *src, const char *dst, const char *match)
+{
+	DIR *dir;
+	const char *name;
+	int ret = 0;
+
+	dir = open_dir(src);
+	if (!dir)
+		return -1;
+
+	while ((name = read_dir(dir, src))) {
+		if (!strcmp(name, ".") || !strcmp(name, "..") ||
+		    (match && fnmatch(match, name, 0) != 0))
+			continue;
+
+		ret = do_entry(src, dst, name);
+		if (ret)
+			goto out;
+	}
+
+out:
+	close_dir(dir);
+
+	return ret;
+}
+
+int main(int argc, char **argv)
+{
+	union lkl_disk_backstore bs;
+	long ret;
+	char mpoint[32], src_path[PATH_MAX], dst_path[PATH_MAX];
+	char *src_path_dir, *src_path_base;
+	unsigned int disk_id;
+
+	if (strstr(argv[0], "cptofs")) {
+		cptofs = 1;
+		ret = argp_parse(&argp_cptofs, argc, argv, 0, 0, &cla);
+	} else {
+		ret = argp_parse(&argp_cpfromfs, argc, argv, 0, 0, &cla);
+	}
+
+	if (ret < 0)
+		return -1;
+
+	if (!cla.printk)
+		lkl_host_ops.print = NULL;
+
+	bs.fd = open(cla.fsimg_path, cptofs ? O_RDWR : O_RDONLY);
+	if (bs.fd < 0) {
+		fprintf(stderr, "can't open fsimg %s: %s\n", cla.fsimg_path,
+			strerror(errno));
+		ret = 1;
+		goto out;
+	}
+
+	disk_id = lkl_disk_add(bs);
+	if (disk_id < 0) {
+		fprintf(stderr, "can't add disk: %s\n", lkl_strerror(ret));
+		goto out_close;
+	}
+
+	lkl_start_kernel(&lkl_host_ops, 100 * 1024 * 1024, "");
+
+	ret = lkl_mount_dev(disk_id, cla.fsimg_type, cptofs ? 0 : LKL_MS_RDONLY,
+			    NULL, mpoint, sizeof(mpoint));
+	if (ret) {
+		fprintf(stderr, "can't mount disk: %s\n", lkl_strerror(ret));
+		goto out_close;
+	}
+
+	if (cptofs) {
+		snprintf(src_path, sizeof(src_path),  "%s", cla.src_path);
+		snprintf(dst_path, sizeof(dst_path),  "%s/%s", mpoint,
+			 cla.dst_path);
+	} else {
+		snprintf(src_path, sizeof(src_path),  "%s/%s", mpoint,
+			 cla.src_path);
+		snprintf(dst_path, sizeof(dst_path),  "%s", cla.dst_path);
+	}
+
+	src_path_dir = dirname(strdup(src_path));
+	src_path_base = basename(strdup(src_path));
+
+	ret = searchdir(src_path_dir, dst_path, src_path_base);
+
+	ret = lkl_umount_dev(disk_id, 0, 1000);
+
+out_close:
+	close(bs.fd);
+
+out:
+	lkl_sys_halt();
+
+	return ret;
+}
-- 
2.1.0

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