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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-12-02 01:01:43 +0100
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-12-02 01:26:54 +0100
commit8f6cac0f6cf931eb08243447d48a71425e5ec3d4 (patch)
treed6ba25314925d29ddd16c749d37e54915a73fe7e /tar/sqfs2tar.c
parente03804015733ae62706233e7b9d1bbb2ab7705f2 (diff)
Add a --root-becomes option to tar2sqfs and sqfs2tar
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'tar/sqfs2tar.c')
-rw-r--r--tar/sqfs2tar.c99
1 files changed, 81 insertions, 18 deletions
diff --git a/tar/sqfs2tar.c b/tar/sqfs2tar.c
index 9a12a96..8cfad62 100644
--- a/tar/sqfs2tar.c
+++ b/tar/sqfs2tar.c
@@ -19,13 +19,14 @@
static struct option long_opts[] = {
{ "subdir", required_argument, NULL, 'd' },
{ "keep-as-dir", no_argument, NULL, 'k' },
+ { "root-becomes", required_argument, NULL, 'r' },
{ "no-skip", no_argument, NULL, 's' },
{ "no-xattr", no_argument, NULL, 'X' },
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
};
-static const char *short_opts = "d:ksXhV";
+static const char *short_opts = "d:kr:sXhV";
static const char *usagestr =
"Usage: sqfs2tar [OPTIONS...] <sqfsfile>\n"
@@ -41,6 +42,14 @@ static const char *usagestr =
" one is specified, it becomes the new root of\n"
" node of the archive file system tree.\n"
"\n"
+" --root-becomes, -r <dir> Turn the root inode into a directory with the\n"
+" specified name. Everything else will be stored\n"
+" inside this directory. The special value '.' is\n"
+" allowed to prefix all tar paths with './' and\n"
+" add an entry named '.' for the root inode.\n"
+" If this option isn't used, all meta data stored\n"
+" in the root inode IS LOST!\n"
+"\n"
" --keep-as-dir, -k If --subdir is used only once, don't make the\n"
" subdir the archive root, instead keep it as\n"
" prefix for all unpacked files.\n"
@@ -68,6 +77,7 @@ static bool dont_skip = false;
static bool keep_as_dir = false;
static bool no_xattr = false;
+static char *root_becomes = NULL;
static char **subdirs = NULL;
static size_t num_subdirs = 0;
static size_t max_subdirs = 0;
@@ -114,6 +124,26 @@ static void process_args(int argc, char **argv)
++num_subdirs;
break;
+ case 'r':
+ free(root_becomes);
+ root_becomes = strdup(optarg);
+ if (root_becomes == NULL)
+ goto fail_errno;
+
+ if (strcmp(root_becomes, "./") == 0)
+ root_becomes[1] = '\0';
+
+ if (strcmp(root_becomes, ".") == 0)
+ break;
+
+ if (canonicalize_name(root_becomes) != 0 ||
+ strlen(root_becomes) == 0) {
+ fprintf(stderr,
+ "Invalid root directory '%s'.\n",
+ optarg);
+ goto fail_arg;
+ }
+ break;
case 'k':
keep_as_dir = true;
break;
@@ -165,6 +195,7 @@ out_success:
out_exit:
for (idx = 0; idx < num_subdirs; ++idx)
free(subdirs[idx]);
+ free(root_becomes);
free(subdirs);
exit(ret);
}
@@ -260,31 +291,62 @@ fail:
static int write_tree_dfs(const sqfs_tree_node_t *n)
{
tar_xattr_t *xattr = NULL, *xit;
- char *name, *target;
+ char *name, *target, *temp;
struct stat sb;
+ size_t len;
int ret;
- if (n->parent == NULL && S_ISDIR(n->inode->base.mode))
- goto skip_hdr;
+ if (n->parent == NULL) {
+ if (root_becomes == NULL)
+ goto skip_hdr;
- if (!is_filename_sane((const char *)n->name)) {
- fprintf(stderr, "Found a file named '%s', skipping.\n",
- n->name);
- if (dont_skip) {
- fputs("Not allowed to skip files, aborting!\n", stderr);
+ len = strlen(root_becomes);
+ name = malloc(len + 2);
+ if (name == NULL) {
+ perror("creating root directory");
return -1;
}
- return 0;
- }
- name = sqfs_tree_node_get_path(n);
- if (name == NULL) {
- perror("resolving tree node path");
- return -1;
- }
+ memcpy(name, root_becomes, len);
+ name[len] = '/';
+ name[len + 1] = '\0';
+ } else {
+ if (!is_filename_sane((const char *)n->name)) {
+ fprintf(stderr, "Found a file named '%s', skipping.\n",
+ n->name);
+ if (dont_skip) {
+ fputs("Not allowed to skip files, aborting!\n",
+ stderr);
+ return -1;
+ }
+ return 0;
+ }
- if (canonicalize_name(name))
- goto out_skip;
+ name = sqfs_tree_node_get_path(n);
+ if (name == NULL) {
+ perror("resolving tree node path");
+ return -1;
+ }
+
+ if (canonicalize_name(name))
+ goto out_skip;
+
+ if (root_becomes != NULL) {
+ len = strlen(root_becomes);
+ temp = realloc(name, strlen(name) + len + 2);
+
+ if (temp == NULL) {
+ perror("assembling tar entry filename");
+ free(name);
+ return -1;
+ }
+
+ name = temp;
+ memmove(name + len + 1, name, strlen(name) + 1);
+ memcpy(name, root_becomes, len);
+ name[len] = '/';
+ }
+ }
inode_stat(n, &sb);
@@ -565,5 +627,6 @@ out_dirs:
for (i = 0; i < num_subdirs; ++i)
free(subdirs[i]);
free(subdirs);
+ free(root_becomes);
return status;
}