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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* fstree_from_dir.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "mkfs.h"
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
static bool should_skip(const dir_iterator_t *dir, const dir_entry_t *ent,
unsigned int flags)
{
if (!strcmp(ent->name, "..") || !strcmp(ent->name, "."))
return true;
if ((flags & DIR_SCAN_ONE_FILESYSTEM) && ent->dev != dir->dev)
return true;
switch (ent->mode & S_IFMT) {
case S_IFSOCK:
return (flags & DIR_SCAN_NO_SOCK) != 0;
case S_IFLNK:
return (flags & DIR_SCAN_NO_SLINK) != 0;
case S_IFREG:
return (flags & DIR_SCAN_NO_FILE) != 0;
case S_IFBLK:
return (flags & DIR_SCAN_NO_BLK) != 0;
case S_IFCHR:
return (flags & DIR_SCAN_NO_CHR) != 0;
case S_IFIFO:
return (flags & DIR_SCAN_NO_FIFO) != 0;
default:
break;
}
return false;
}
static sqfs_u32 clamp_timestamp(sqfs_s64 ts)
{
if (ts < 0)
return 0;
if (ts > 0x0FFFFFFFFLL)
return 0xFFFFFFFF;
return ts;
}
static void discard_node(tree_node_t *root, tree_node_t *n)
{
tree_node_t *it;
if (n == root->data.children) {
root->data.children = n->next;
} else {
it = root->data.children;
while (it != NULL && it->next != n)
it = it->next;
if (it != NULL)
it->next = n->next;
}
free(n);
}
static int scan_dir(fstree_t *fs, tree_node_t *root, dir_iterator_t *dir,
scan_node_callback cb, void *user, unsigned int flags)
{
for (;;) {
dir_entry_t *ent = NULL;
tree_node_t *n = NULL;
char *extra = NULL;
int ret = dir->next(dir, &ent);
if (ret > 0)
break;
if (ret < 0) {
sqfs_perror("readdir", NULL, ret);
return -1;
}
if (should_skip(dir, ent, flags)) {
free(ent);
continue;
}
if (S_ISLNK(ent->mode)) {
ret = dir->read_link(dir, &extra);
if (ret) {
free(ent);
sqfs_perror("readlink", ent->name, ret);
return -1;
}
}
if (!(flags & DIR_SCAN_KEEP_TIME))
ent->mtime = fs->defaults.mtime;
if (S_ISDIR(ent->mode) && (flags & DIR_SCAN_NO_DIR)) {
n = fstree_get_node_by_path(fs, root, ent->name,
false, false);
if (n == NULL) {
free(ent);
continue;
}
ret = 0;
} else {
struct stat sb;
memset(&sb, 0, sizeof(sb));
sb.st_uid = ent->uid;
sb.st_gid = ent->gid;
sb.st_mode = ent->mode;
sb.st_mtime = clamp_timestamp(ent->mtime);
n = fstree_mknode(root, ent->name,
strlen(ent->name), extra, &sb);
if (n == NULL) {
perror("creating tree node");
free(extra);
free(ent);
return -1;
}
ret = (cb == NULL) ? 0 : cb(user, fs, n);
}
free(ent);
free(extra);
if (ret < 0)
return -1;
if (ret > 0) {
discard_node(root, n);
continue;
}
if (!(flags & DIR_SCAN_NO_RECURSION) && S_ISDIR(n->mode)) {
dir_iterator_t *sub;
ret = dir->open_subdir(dir, &sub);
if (ret != 0) {
sqfs_perror(n->name, "opening directory", ret);
return -1;
}
ret = scan_dir(fs, n, sub, cb, user, flags);
sqfs_drop(sub);
if (ret)
return -1;
}
}
return 0;
}
int fstree_from_subdir(fstree_t *fs, tree_node_t *root,
const char *path, const char *subdir,
scan_node_callback cb, void *user,
unsigned int flags)
{
dir_iterator_t *dir;
size_t plen, slen;
char *temp = NULL;
int ret;
if (!S_ISDIR(root->mode)) {
fprintf(stderr,
"scanning %s/%s into %s: target is not a directory\n",
path, subdir == NULL ? "" : subdir, root->name);
return -1;
}
plen = strlen(path);
slen = subdir == NULL ? 0 : strlen(subdir);
if (slen > 0) {
temp = calloc(1, plen + 1 + slen + 1);
if (temp == NULL) {
fprintf(stderr, "%s/%s: allocation failure.\n",
path, subdir);
return -1;
}
memcpy(temp, path, plen);
temp[plen] = '/';
memcpy(temp + plen + 1, subdir, slen);
temp[plen + 1 + slen] = '\0';
path = temp;
}
dir = dir_iterator_create(path);
free(temp);
if (dir == NULL)
return -1;
ret = scan_dir(fs, root, dir, cb, user, flags);
sqfs_drop(dir);
return ret;
}
int fstree_from_dir(fstree_t *fs, tree_node_t *root,
const char *path, scan_node_callback cb,
void *user, unsigned int flags)
{
return fstree_from_subdir(fs, root, path, NULL, cb, user, flags);
}
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