mirror of https://github.com/pygos/pkg-utils.git
Signed-off-by: David Oberhollenzer <goliath@infraroot.at>master
parent
be9bfed9b0
commit
35fabedb49
@ -1,27 +0,0 @@
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#include "unpack.h"
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int create_hierarchy(int dirfd, image_entry_t *list)
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{
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image_entry_t *ent;
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for (ent = list; ent != NULL; ent = ent->next) {
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if (S_ISDIR(ent->mode)) {
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if (mkdirat(dirfd, ent->name, 0755)) {
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perror(ent->name);
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return -1;
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}
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}
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}
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for (ent = list; ent != NULL; ent = ent->next) {
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if (S_ISLNK(ent->mode)) {
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if (symlinkat(ent->data.symlink.target,
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dirfd, ent->name)) {
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perror(ent->name);
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return -1;
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}
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}
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}
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return 0;
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}
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@ -0,0 +1,190 @@
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#include "unpack.h"
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static int create_hierarchy(int dirfd, image_entry_t *list)
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{
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image_entry_t *ent;
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for (ent = list; ent != NULL; ent = ent->next) {
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if (S_ISDIR(ent->mode)) {
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if (mkdirat(dirfd, ent->name, 0755)) {
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perror(ent->name);
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return -1;
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}
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}
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}
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for (ent = list; ent != NULL; ent = ent->next) {
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if (S_ISLNK(ent->mode)) {
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if (symlinkat(ent->data.symlink.target,
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dirfd, ent->name)) {
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perror(ent->name);
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return -1;
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}
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}
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}
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return 0;
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}
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static image_entry_t *get_file_entry(image_entry_t *list, uint32_t id)
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{
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while (list != NULL) {
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if (S_ISREG(list->mode) && list->data.file.id == id)
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return list;
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list = list->next;
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}
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return NULL;
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}
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static int unpack_files(int dirfd, image_entry_t *list, pkg_reader_t *rd)
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{
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uint8_t buffer[2048];
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image_entry_t *meta;
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file_data_t frec;
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ssize_t ret;
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size_t diff;
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uint64_t i;
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int fd;
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for (;;) {
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ret = pkg_reader_read_payload(rd, &frec, sizeof(frec));
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if (ret == 0)
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break;
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if (ret < 0)
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return -1;
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if ((size_t)ret < sizeof(frec))
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goto fail_trunc;
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frec.id = le32toh(frec.id);
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meta = get_file_entry(list, frec.id);
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if (meta == NULL) {
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fprintf(stderr, "%s: missing meta information for "
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"file %u\n", pkg_reader_get_filename(rd),
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(unsigned int)frec.id);
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return -1;
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}
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fd = openat(dirfd, meta->name, O_WRONLY | O_CREAT | O_EXCL,
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0644);
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if (fd < 0) {
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perror(meta->name);
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return -1;
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}
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for (i = 0; i < meta->data.file.size; i += ret) {
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if ((meta->data.file.size - i) <
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(uint64_t)sizeof(buffer)) {
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diff = meta->data.file.size - i;
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} else {
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diff = sizeof(buffer);
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}
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ret = pkg_reader_read_payload(rd, buffer, diff);
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if (ret < 0)
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goto fail_fd;
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if ((size_t)ret < diff)
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goto fail_trunc;
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ret = write_retry(fd, buffer, diff);
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if (ret < 0) {
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perror(meta->name);
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goto fail_fd;
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}
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if ((size_t)ret < diff) {
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fprintf(stderr, "%s: truncated write\n",
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pkg_reader_get_filename(rd));
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goto fail_fd;
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}
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}
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close(fd);
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}
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return 0;
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fail_fd:
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close(fd);
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return -1;
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fail_trunc:
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fprintf(stderr, "%s: truncated file data record\n",
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pkg_reader_get_filename(rd));
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return -1;
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}
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static int change_permissions(int dirfd, image_entry_t *list, int flags)
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{
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while (list != NULL) {
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if (S_ISLNK(list->mode)) {
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list = list->next;
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continue;
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}
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if (!(flags & FLAG_NO_CHMOD) && !S_ISLNK(list->mode)) {
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if (fchmodat(dirfd, list->name,
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list->mode & 07777, 0)) {
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fprintf(stderr, "%s: chmod: %s\n", list->name,
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strerror(errno));
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return -1;
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}
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}
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if (!(flags & FLAG_NO_CHOWN)) {
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if (fchownat(dirfd, list->name, list->uid, list->gid,
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AT_SYMLINK_NOFOLLOW)) {
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fprintf(stderr, "%s: chown: %s\n", list->name,
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strerror(errno));
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return -1;
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}
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}
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list = list->next;
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}
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return 0;
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}
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int pkg_unpack(int rootfd, int flags, pkg_reader_t *rd)
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{
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image_entry_t *list = NULL;
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record_t *hdr;
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int ret;
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list = image_entry_list_from_package(rd);
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if (list == NULL)
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return -1;
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list = image_entry_sort(list);
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if (pkg_reader_rewind(rd))
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goto fail;
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if (create_hierarchy(rootfd, list))
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goto fail;
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for (;;) {
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ret = pkg_reader_get_next_record(rd);
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if (ret == 0)
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break;
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if (ret < 0)
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goto fail;
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hdr = pkg_reader_current_record_header(rd);
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if (hdr->magic == PKG_MAGIC_DATA) {
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if (unpack_files(rootfd, list, rd))
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goto fail;
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}
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}
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if (change_permissions(rootfd, list, flags))
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goto fail;
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image_entry_free_list(list);
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return 0;
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fail:
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image_entry_free_list(list);
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return -1;
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}
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