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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "fstree.h"
#include "util.h"
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
static size_t path_size(tree_node_t *n)
{
size_t size = 0;
while (n != NULL) {
size += strlen(n->name) + 1;
n = n->parent;
}
return size;
}
static char *print_path(char *ptr, tree_node_t *n)
{
if (n->parent != NULL) {
ptr = print_path(ptr, n->parent);
*(ptr++) = '/';
strcpy(ptr, n->name);
return ptr + strlen(ptr);
}
return ptr;
}
static int populate_dir(tree_node_t *root, int fd, size_t blocksize,
const char *rootdir)
{
size_t size, blockcount;
struct dirent *ent;
struct stat sb;
tree_node_t *n;
ssize_t ret;
void *ptr;
DIR *dir;
int cfd;
dir = fdopendir(fd);
if (dir == NULL) {
perror("fdopendir");
close(fd);
return -1;
}
for (;;) {
n = NULL;
errno = 0;
ent = readdir(dir);
if (ent == NULL) {
if (errno) {
perror("readdir");
goto fail;
}
break;
}
if (!strcmp(ent->d_name, "..") || !strcmp(ent->d_name, "."))
continue;
if (fstatat(fd, ent->d_name, &sb, AT_SYMLINK_NOFOLLOW)) {
perror(ent->d_name);
goto fail;
}
size = sizeof(tree_node_t) + strlen(ent->d_name) + 1;
switch (sb.st_mode & S_IFMT) {
case S_IFLNK:
size += sb.st_size + 1;
break;
case S_IFREG:
blockcount = sb.st_size / blocksize + 1;
size += sizeof(file_info_t);
size += sizeof(uint32_t) * blockcount;
size += path_size(root) + strlen(ent->d_name) + 1;
size += strlen(rootdir) + 2;
break;
case S_IFDIR:
size += sizeof(dir_info_t);
break;
}
n = calloc(1, size);
if (n == NULL) {
perror("allocating tree node");
goto fail;
}
n->uid = sb.st_uid;
n->gid = sb.st_gid;
n->mode = sb.st_mode;
n->parent = root;
ptr = n->payload;
switch (sb.st_mode & S_IFMT) {
case S_IFLNK:
ret = readlinkat(fd, ent->d_name, ptr, sb.st_size);
if (ret < 0) {
perror("readlink");
goto fail;
}
n->data.slink_target = ptr;
ptr = (char *)ptr + strlen(ptr) + 1;
break;
case S_IFBLK:
case S_IFCHR:
n->data.devno = sb.st_rdev;
break;
case S_IFDIR:
n->data.dir = ptr;
ptr = (char *)ptr + sizeof(dir_info_t);
break;
case S_IFREG:
n->data.file = ptr;
ptr = (char *)ptr + sizeof(file_info_t);
ptr = (char *)ptr + sizeof(uint32_t) * blockcount;
n->data.file->input_file = ptr;
n->data.file->size = sb.st_size;
strcpy(ptr, rootdir);
ptr = (char *)ptr + strlen(ptr);
ptr = print_path(ptr, root);
*((char*)ptr) = '/';
strcpy((char *)ptr + 1, ent->d_name);
ptr = (char *)ptr + strlen(ptr) + 1;
break;
}
n->name = ptr;
strcpy(ptr, ent->d_name);
n->next = root->data.dir->children;
root->data.dir->children = n;
}
for (n = root->data.dir->children; n != NULL; n = n->next) {
if (S_ISDIR(n->mode)) {
cfd = openat(fd, n->name, O_RDONLY | O_DIRECTORY);
if (cfd < 0) {
perror(n->name);
goto fail_dir;
}
if (populate_dir(n, cfd, blocksize, rootdir)) {
close(cfd);
goto fail_dir;
}
}
}
closedir(dir);
return 0;
fail:
free(n);
fail_dir:
closedir(dir);
return -1;
}
int fstree_from_dir(fstree_t *fs, const char *path)
{
int fd = open(path, O_RDONLY | O_DIRECTORY);
if (fd < 0) {
perror(path);
return -1;
}
return populate_dir(fs->root, fd, fs->block_size, path);
}
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