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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* hardlink.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "fstree.h"
#include <string.h>
#include <stdlib.h>
#include <errno.h>
static int resolve_link(fstree_t *fs, tree_node_t *node)
{
tree_node_t *start = node;
for (;;) {
if (!S_ISLNK(node->mode) || !(node->flags & FLAG_LINK_IS_HARD))
break;
if (node->flags & FLAG_LINK_RESOVED) {
node = node->data.target_node;
} else {
node = fstree_get_node_by_path(fs, fs->root,
node->data.target,
false, false);
if (node == NULL)
return -1;
}
if (node == start) {
errno = EMLINK;
return -1;
}
}
if (S_ISDIR(node->mode)) {
errno = EPERM;
return -1;
}
if (node->link_count == 0xFFFFFFFF) {
errno = EMLINK;
return -1;
}
start->flags |= FLAG_LINK_RESOVED;
start->data.target_node = node;
node->link_count++;
return 0;
}
int fstree_resolve_hard_links(fstree_t *fs)
{
while (fs->links_unresolved != NULL) {
tree_node_t *n = fs->links_unresolved;
if (resolve_link(fs, n)) {
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;
}
fs->links_unresolved = n->next_by_type;
n->next_by_type = NULL;
}
return 0;
}
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