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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-06-30 16:41:21 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-06-30 16:41:21 +0200
commitf439b20706ade4b5630c3d6c57e6a36ce0dc287a (patch)
tree210abf39ac29d7cf7513f667f63495ef1fd43700 /tar/tar2sqfs.c
parent3e920038ecd8cc123b0c8dd957f94a8e1a616c0c (diff)
Add support for repacking condensed sparse files
This commit broadly does the following things: - Rename and move the sparse mapping structure to libutil - Add a function to the data writer for writing condensed versions of sparse files, given the mapping. - This shares code with the already existing function for regular files. The shared code is moved to a common helper function. - Add support to tar2sqfs for repacking sparse files. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'tar/tar2sqfs.c')
-rw-r--r--tar/tar2sqfs.c62
1 files changed, 53 insertions, 9 deletions
diff --git a/tar/tar2sqfs.c b/tar/tar2sqfs.c
index 48e7fda..bce6a4d 100644
--- a/tar/tar2sqfs.c
+++ b/tar/tar2sqfs.c
@@ -165,6 +165,26 @@ fail_arg:
exit(EXIT_FAILURE);
}
+static int write_file(tar_header_decoded_t *hdr, file_info_t *fi,
+ data_writer_t *data)
+{
+ int ret;
+
+ if (hdr->sparse != NULL) {
+ ret = write_data_from_fd_condensed(data, fi, STDIN_FILENO,
+ hdr->sparse);
+ if (ret)
+ return -1;
+
+ return skip_padding(STDIN_FILENO, hdr->sparse_size);
+ }
+
+ if (write_data_from_fd(data, fi, STDIN_FILENO))
+ return -1;
+
+ return skip_padding(STDIN_FILENO, fi->size);
+}
+
static int create_node_and_repack_data(tar_header_decoded_t *hdr, fstree_t *fs,
data_writer_t *data)
{
@@ -177,15 +197,8 @@ static int create_node_and_repack_data(tar_header_decoded_t *hdr, fstree_t *fs,
if (!quiet)
printf("Packing %s\n", hdr->name);
- if (S_ISREG(hdr->sb.st_mode)) {
- if (write_data_from_fd(data, node->data.file,
- STDIN_FILENO)) {
- return -1;
- }
-
- if (skip_padding(STDIN_FILENO, node->data.file->size))
- return -1;
- }
+ if (S_ISREG(hdr->sb.st_mode))
+ return write_file(hdr, node->data.file, data);
return 0;
fail_errno:
@@ -196,6 +209,9 @@ fail_errno:
static int process_tar_ball(fstree_t *fs, data_writer_t *data)
{
tar_header_decoded_t hdr;
+ uint64_t offset, count;
+ sparse_map_t *m;
+ bool skip;
int ret;
for (;;) {
@@ -205,9 +221,37 @@ static int process_tar_ball(fstree_t *fs, data_writer_t *data)
if (ret < 0)
return -1;
+ skip = false;
+
if (hdr.unknown_record) {
fprintf(stderr, "skipping '%s' (unknown entry type)\n",
hdr.name);
+ skip = true;
+ }
+
+ if (!skip && hdr.sparse != NULL) {
+ offset = hdr.sparse->offset;
+ count = 0;
+
+ for (m = hdr.sparse; m != NULL; m = m->next) {
+ if (m->offset < offset) {
+ skip = true;
+ break;
+ }
+ offset = m->offset + m->count;
+ count += m->count;
+ }
+
+ if (count != hdr.sparse_size)
+ skip = true;
+
+ if (skip) {
+ fprintf(stderr, "skipping '%s' (broken sparse "
+ "file layout)\n", hdr.name);
+ }
+ }
+
+ if (skip) {
if (skip_entry(STDIN_FILENO, hdr.sb.st_size))
goto fail;
continue;