Simple utility that converts a filesystem image to a tar file,
preserving file rights and extended attributes.
Signed-off-by: Octavian Purdila <octavian.purd...@intel.com>
---
tools/lkl/.gitignore | 1 +
tools/lkl/Makefile | 3 +
tools/lkl/fs2tar.c | 397 +++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 401 insertions(+)
create mode 100644 tools/lkl/fs2tar.c
diff --git a/tools/lkl/.gitignore b/tools/lkl/.gitignore
index 7c456f2..a345a79 100644
--- a/tools/lkl/.gitignore
+++ b/tools/lkl/.gitignore
@@ -1 +1,2 @@
test/boot
+fs2tar
diff --git a/tools/lkl/Makefile b/tools/lkl/Makefile
index 1ae4481..9aeab49 100644
--- a/tools/lkl/Makefile
+++ b/tools/lkl/Makefile
@@ -9,6 +9,7 @@ endif
lib_source = $(filter-out %-host.c,$(wildcard lib/*.c))
source = $(wildcard tests/*.c)
ifneq (,$(filter $(shell $(LD) -r -print-output-format),elf64-x86-64
elf32-i386))
+source += $(wildcard *.c)
lib_source += lib/posix-host.c
LDFLAGS += -lpthread -lrt
endif
@@ -35,3 +36,5 @@ $(execs): lib/liblkl.a
clean:
-rm -rf include/lkl/ lib/liblkl.a $(lib_objs) $(objs) $(execs)
+
+fs2tar: LDFLAGS += -larchive
diff --git a/tools/lkl/fs2tar.c b/tools/lkl/fs2tar.c
new file mode 100644
index 0000000..b74da66
--- /dev/null
+++ b/tools/lkl/fs2tar.c
@@ -0,0 +1,397 @@
+#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 <archive.h>
+#include <archive_entry.h>
+#undef st_atime
+#undef st_mtime
+#undef st_ctime
+#include <lkl.h>
+#include <lkl_host.h>
+
+char doc[] = "";
+char args_doc[] = "-t fstype fsimage_path tar_path";
+static struct argp_option options[] = {
+ {"enable-printk", 'p', 0, 0, "show Linux printks"},
+ {"filesystem-type", 't', "string", 0,
+ "select filesystem type - mandatory"},
+ {"selinux-contexts", 's', "file", 0,
+ "export sexlinux contexts to file"},
+ {0},
+};
+
+static struct cl_args {
+ int printk;
+ const char *fsimg_type;
+ const char *fsimg_path;
+ const char *tar_path;
+ FILE *selinux;
+} cla;
+
+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 's':
+ cla->selinux = fopen(arg, "w");
+ if (!cla->selinux) {
+ fprintf(stderr, "failed to open selinux contexts file:
%s\n",
+ strerror(errno));
+ return -1;
+ }
+ break;
+ case ARGP_KEY_ARG:
+ if (!cla->fsimg_path)
+ cla->fsimg_path = arg;
+ else if (!cla->tar_path)
+ cla->tar_path = arg;
+ else
+ return -1;
+ break;
+ case ARGP_KEY_END:
+ if (state->arg_num < 2 || !cla->fsimg_type)
+ argp_usage(state);
+ default:
+ return ARGP_ERR_UNKNOWN;
+ }
+
+ return 0;
+}
+
+static struct argp argp = { options, parse_opt, args_doc, doc };
+
+static struct archive *tar;
+
+static int searchdir(const char *fsimg_path, const char *path);
+
+static int copy_file(const char *fsimg_path, const char *path)
+{
+ long fsimg_fd;
+ char buff[4096];
+ long len, wrote;
+ int ret = 0;
+
+ fsimg_fd = lkl_sys_open(fsimg_path, LKL_O_RDONLY, 0);
+ if (fsimg_fd < 0) {
+ fprintf(stderr, "fsimg error opening %s: %s\n", fsimg_path,
+ lkl_strerror(fsimg_fd));
+ return fsimg_fd;
+ }
+
+ do {
+ len = lkl_sys_read(fsimg_fd, buff, sizeof(buff));
+ if (len > 0) {
+ wrote = archive_write_data(tar, buff, len);
+ if (wrote != len) {
+ fprintf(stderr, "error writing file %s to
archive: %s [%d %ld]\n",
+ path, archive_error_string(tar), ret,
+ len);
+ ret = -archive_errno(tar);
+ break;
+ }
+ }
+
+ if (len < 0) {
+ fprintf(stderr, "error reading fsimg file %s: %s\n",
+ fsimg_path, lkl_strerror(len));
+ ret = len;
+ }
+
+ } while (len > 0);
+
+ lkl_sys_close(fsimg_fd);
+
+ return ret;
+}
+
+static int add_link(const char *fsimg_path, const char *path,
+ struct archive_entry *entry)
+{
+ char buf[4096] = { 0, };
+ long len;
+
+ len = lkl_sys_readlink(fsimg_path, buf, sizeof(buf));
+ if (len < 0) {
+ fprintf(stderr, "fsimg readlink error %s: %s\n",
+ fsimg_path, lkl_strerror(len));
+ return len;
+ }
+
+ archive_entry_set_symlink(entry, buf);
+
+ return 0;
+}
+
+static inline void fsimg_copy_stat(struct stat *st, struct lkl_stat64 *fst)
+{
+ st->st_dev = fst->st_dev;
+ st->st_ino = fst->st_ino;
+ st->st_mode = fst->st_mode;
+ st->st_nlink = fst->st_nlink;
+ st->st_uid = fst->st_uid;
+ st->st_gid = fst->st_gid;
+ st->st_rdev = fst->st_rdev;
+ st->st_size = fst->st_size;
+ st->st_blksize = fst->st_blksize;
+ st->st_blocks = fst->st_blocks;
+ st->st_atim.tv_sec = fst->st_atime;
+ st->st_atim.tv_nsec = fst->st_atime_nsec;
+ st->st_mtim.tv_sec = fst->st_mtime;
+ st->st_mtim.tv_nsec = fst->st_mtime_nsec;
+ st->st_ctim.tv_sec = fst->st_ctime;
+ st->st_ctim.tv_nsec = fst->st_ctime_nsec;
+}
+
+static int copy_xattr(const char *fsimg_path, const char *path,
+ struct archive_entry *entry)
+{
+ long ret;
+ char *xattr_list, *i;
+ long xattr_list_size;
+
+ ret = lkl_sys_llistxattr(fsimg_path, NULL, 0);
+ if (ret < 0) {
+ fprintf(stderr, "fsimg llistxattr(%s) error: %s\n",
+ path, lkl_strerror(ret));
+ return ret;
+ }
+
+ if (!ret)
+ return 0;
+
+ xattr_list = malloc(ret);
+
+ ret = lkl_sys_llistxattr(fsimg_path, xattr_list, ret);
+ if (ret < 0) {
+ fprintf(stderr, "fsimg llistxattr(%s) error: %s\n", path,
+ lkl_strerror(ret));
+ free(xattr_list);
+ return ret;
+ }
+
+ xattr_list_size = ret;
+
+ for (i = xattr_list; i - xattr_list < xattr_list_size;
+ i += strlen(i) + 1) {
+ void *xattr_buf;
+
+ ret = lkl_sys_lgetxattr(fsimg_path, i, NULL, 0);
+ if (ret < 0) {
+ fprintf(stderr, "fsimg lgetxattr(%s) error: %s\n", path,
+ lkl_strerror(ret));
+ free(xattr_list);
+ return ret;
+ }
+
+ xattr_buf = malloc(ret);
+
+ ret = lkl_sys_lgetxattr(fsimg_path, i, xattr_buf, ret);
+ if (ret < 0) {
+ fprintf(stderr, "fsimg lgetxattr2(%s) error: %s\n",
+ path, lkl_strerror(ret));
+ free(xattr_list);
+ free(xattr_buf);
+ return ret;
+ }
+
+ if (cla.selinux && strcmp(i, "security.selinux") == 0)
+ fprintf(cla.selinux, "%s %s\n", path,
+ (char *)xattr_buf);
+
+ archive_entry_xattr_clear(entry);
+ archive_entry_xattr_add_entry(entry, i, xattr_buf, ret);
+
+ free(xattr_buf);
+ }
+
+ free(xattr_list);
+
+ return 0;
+}
+
+static int do_entry(const char *fsimg_path, const char *path,
+ const struct lkl_dirent64 *de)
+{
+ char fsimg_new_path[PATH_MAX], new_path[PATH_MAX];
+ struct lkl_stat64 fsimg_stat;
+ struct stat stat;
+ struct archive_entry *entry;
+ int ftype;
+ long ret;
+
+ snprintf(new_path, sizeof(new_path), "%s/%s", path, de->d_name);
+ snprintf(fsimg_new_path, sizeof(fsimg_new_path), "%s/%s", fsimg_path,
+ de->d_name);
+
+ ret = lkl_sys_lstat64(fsimg_new_path, &fsimg_stat);
+ if (ret) {
+ fprintf(stderr, "fsimg fstat64(%s) error: %s\n",
+ path, lkl_strerror(ret));
+ return ret;
+ }
+
+ entry = archive_entry_new();
+
+ archive_entry_set_pathname(entry, new_path);
+ fsimg_copy_stat(&stat, &fsimg_stat);
+ archive_entry_copy_stat(entry, &stat);
+ ret = copy_xattr(fsimg_new_path, new_path, entry);
+ if (ret)
+ return ret;
+ /* TODO: ACLs */
+
+ ftype = stat.st_mode & S_IFMT;
+
+ switch (ftype) {
+ case S_IFREG:
+ archive_write_header(tar, entry);
+ ret = copy_file(fsimg_new_path, new_path);
+ break;
+ case S_IFDIR:
+ archive_write_header(tar, entry);
+ ret = searchdir(fsimg_new_path, new_path);
+ break;
+ case S_IFLNK:
+ ret = add_link(fsimg_new_path, new_path, entry);
+ /* fall through */
+ case S_IFSOCK:
+ case S_IFBLK:
+ case S_IFCHR:
+ case S_IFIFO:
+ if (ret)
+ break;
+ archive_write_header(tar, entry);
+ break;
+ default:
+ printf("skipping %s: unsupported entry type %d\n", new_path,
+ ftype);
+ }
+
+ archive_entry_free(entry);
+
+ if (ret)
+ printf("error processing entry %s, aborting\n", new_path);
+
+ return ret;
+}
+
+static int searchdir(const char *fsimg_path, const char *path)
+{
+ long ret, fd;
+ char buf[1024], *pos;
+ long buf_len;
+
+ fd = lkl_sys_open(fsimg_path, LKL_O_RDONLY | LKL_O_DIRECTORY, 0);
+ if (fd < 0) {
+ fprintf(stderr, "failed to open dir %s: %s", fsimg_path,
+ lkl_strerror(fd));
+ return fd;
+ }
+
+ do {
+ struct lkl_dirent64 *de;
+
+ buf_len = lkl_sys_getdents64(fd, buf, sizeof(buf));
+ if (buf_len < 0) {
+ fprintf(stderr, "gentdents64 error: %s\n",
+ lkl_strerror(buf_len));
+ break;
+ }
+
+ for (pos = buf; pos - buf < buf_len; pos += de->d_reclen) {
+ de = (struct lkl_dirent64 *)pos;
+
+ if (!strcmp(de->d_name, ".") ||
+ !strcmp(de->d_name, ".."))
+ continue;
+
+ ret = do_entry(fsimg_path, path, de);
+ if (ret)
+ goto out;
+ }
+
+ } while (buf_len > 0);
+
+out:
+ lkl_sys_close(fd);
+ return ret;
+}
+
+int main(int argc, char **argv)
+{
+ union lkl_disk_backstore bs;
+ long ret;
+ char mpoint[32];
+ unsigned int disk_id;
+
+ if (argp_parse(&argp, argc, argv, 0, 0, &cla) < 0)
+ return -1;
+
+ if (!cla.printk)
+ lkl_host_ops.print = NULL;
+
+ bs.fd = open(cla.fsimg_path, 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, 10 * 1024 * 1024, "");
+
+ ret = lkl_mount_dev(disk_id, cla.fsimg_type, LKL_MS_RDONLY, NULL,
+ mpoint, sizeof(mpoint));
+ if (ret) {
+ fprintf(stderr, "can't mount disk: %s\n", lkl_strerror(ret));
+ goto out_close;
+ }
+
+ ret = lkl_sys_chdir(mpoint);
+ if (ret) {
+ fprintf(stderr, "can't chdir to %s: %s\n", mpoint,
+ lkl_strerror(ret));
+ goto out_umount;
+ }
+
+ tar = archive_write_new();
+ archive_write_set_format_pax_restricted(tar);
+ archive_write_open_filename(tar, cla.tar_path);
+
+ ret = searchdir(mpoint, "");
+
+ archive_write_free(tar);
+
+ if (cla.selinux)
+ fclose(cla.selinux);
+
+out_umount:
+ 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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