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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* post_process.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "internal.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <stdio.h>
#include <errno.h>
static void swap_link_with_target(tree_node_t *node)
{
tree_node_t *tgt, *it;
tgt = node->data.target_node;
node->xattr_idx = tgt->xattr_idx;
node->uid = tgt->uid;
node->gid = tgt->gid;
node->inode_num = tgt->inode_num;
node->mod_time = tgt->mod_time;
node->mode = tgt->mode;
node->link_count = tgt->link_count;
node->inode_ref = tgt->inode_ref;
/* FIXME: data pointers now point to foreign node! */
node->data = tgt->data;
tgt->mode = FSTREE_MODE_HARD_LINK_RESOLVED;
tgt->data.target_node = node;
if (S_ISDIR(node->mode)) {
for (it = node->data.dir.children; it != NULL; it = it->next)
it->parent = node;
}
}
static void hard_link_snap(tree_node_t *n)
{
/* XXX: the hard-link-vs-target swap may create hard links
pointing to hard links, making this necessary */
while (n->data.target_node->mode == FSTREE_MODE_HARD_LINK_RESOLVED)
n->data.target_node = n->data.target_node->data.target_node;
}
static void alloc_inode_num_dfs(fstree_t *fs, tree_node_t *root)
{
bool has_subdirs = false;
tree_node_t *it, *tgt;
for (it = root->data.dir.children; it != NULL; it = it->next) {
if (it->mode == FSTREE_MODE_HARD_LINK_RESOLVED) {
hard_link_snap(it);
tgt = it->data.target_node;
if (tgt->inode_num == 0 && tgt->parent != root)
swap_link_with_target(it);
}
if (S_ISDIR(it->mode))
has_subdirs = true;
}
if (has_subdirs) {
for (it = root->data.dir.children; it != NULL; it = it->next) {
if (S_ISDIR(it->mode))
alloc_inode_num_dfs(fs, it);
}
}
for (it = root->data.dir.children; it != NULL; it = it->next) {
if (it->mode == FSTREE_MODE_HARD_LINK_RESOLVED) {
hard_link_snap(it);
} else {
it->inode_num = fs->unique_inode_count + 1;
fs->unique_inode_count += 1;
}
}
}
static int resolve_hard_links_dfs(fstree_t *fs, tree_node_t *n)
{
tree_node_t *it;
if (n->mode == FSTREE_MODE_HARD_LINK) {
if (fstree_resolve_hard_link(fs, n))
goto fail_link;
assert(n->mode == FSTREE_MODE_HARD_LINK_RESOLVED);
it = n->data.target_node;
if (S_ISDIR(it->mode) && it->data.dir.visited)
goto fail_link_loop;
} else if (S_ISDIR(n->mode)) {
n->data.dir.visited = true;
for (it = n->data.dir.children; it != NULL; it = it->next) {
if (resolve_hard_links_dfs(fs, it))
return -1;
}
n->data.dir.visited = false;
}
return 0;
fail_link: {
char *path = fstree_get_path(n);
fprintf(stderr, "Resolving hard link '%s' -> '%s': %s\n",
path == NULL ? n->name : path, n->data.target,
strerror(errno));
free(path);
}
return -1;
fail_link_loop: {
char *npath = fstree_get_path(n);
char *tpath = fstree_get_path(it);
fprintf(stderr, "Hard link loop detected in '%s' -> '%s'\n",
npath == NULL ? n->name : npath,
tpath == NULL ? it->name : tpath);
free(npath);
free(tpath);
}
return -1;
}
static void sort_recursive(tree_node_t *n)
{
n->data.dir.children = tree_node_list_sort(n->data.dir.children);
for (n = n->data.dir.children; n != NULL; n = n->next) {
if (S_ISDIR(n->mode))
sort_recursive(n);
}
}
static file_info_t *file_list_dfs(tree_node_t *n)
{
if (S_ISREG(n->mode)) {
n->data.file.next = NULL;
return &n->data.file;
}
if (S_ISDIR(n->mode)) {
file_info_t *list = NULL, *last = NULL;
for (n = n->data.dir.children; n != NULL; n = n->next) {
if (list == NULL) {
list = file_list_dfs(n);
if (list == NULL)
continue;
last = list;
} else {
last->next = file_list_dfs(n);
}
while (last->next != NULL)
last = last->next;
}
return list;
}
return NULL;
}
static void map_inodes_dfs(fstree_t *fs, tree_node_t *n)
{
if (n->mode == FSTREE_MODE_HARD_LINK_RESOLVED)
return;
fs->inodes[n->inode_num - 1] = n;
if (S_ISDIR(n->mode)) {
for (n = n->data.dir.children; n != NULL; n = n->next)
map_inodes_dfs(fs, n);
}
}
int fstree_post_process(fstree_t *fs)
{
sort_recursive(fs->root);
if (resolve_hard_links_dfs(fs, fs->root))
return -1;
fs->unique_inode_count = 0;
alloc_inode_num_dfs(fs, fs->root);
fs->root->inode_num = fs->unique_inode_count + 1;
fs->unique_inode_count += 1;
fs->inodes = calloc(sizeof(fs->inodes[0]), fs->unique_inode_count);
if (fs->inodes == NULL) {
perror("Allocating inode list");
return -1;
}
map_inodes_dfs(fs, fs->root);
fs->files = file_list_dfs(fs->root);
return 0;
}
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