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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 "fstree.h"
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
static void discard_node(tree_node_t *root, tree_node_t *n)
{
tree_node_t *it;
if (n == root->data.dir.children) {
root->data.dir.children = n->next;
} else {
it = root->data.dir.children;
while (it != NULL && it->next != n)
it = it->next;
if (it != NULL)
it->next = n->next;
}
free(n);
}
#ifdef _WIN32
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)
{
(void)fs; (void)root; (void)path; (void)subdir; (void)flags;
(void)cb; (void)user;
fputs("Packing a directory is not supported on Windows.\n", stderr);
return -1;
}
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);
}
#else
static int populate_dir(int dir_fd, fstree_t *fs, tree_node_t *root,
dev_t devstart, scan_node_callback cb,
void *user, unsigned int flags)
{
char *extra = NULL;
struct dirent *ent;
int ret, childfd;
struct stat sb;
tree_node_t *n;
DIR *dir;
dir = fdopendir(dir_fd);
if (dir == NULL) {
perror("fdopendir");
close(dir_fd);
return -1;
}
/* XXX: fdopendir can dup and close dir_fd internally
and still be compliant with the spec. */
dir_fd = dirfd(dir);
for (;;) {
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(dir_fd, ent->d_name, &sb, AT_SYMLINK_NOFOLLOW)) {
perror(ent->d_name);
goto fail;
}
switch (sb.st_mode & S_IFMT) {
case S_IFSOCK:
if (flags & DIR_SCAN_NO_SOCK)
continue;
break;
case S_IFLNK:
if (flags & DIR_SCAN_NO_SLINK)
continue;
break;
case S_IFREG:
if (flags & DIR_SCAN_NO_FILE)
continue;
break;
case S_IFBLK:
if (flags & DIR_SCAN_NO_BLK)
continue;
break;
case S_IFCHR:
if (flags & DIR_SCAN_NO_CHR)
continue;
break;
case S_IFIFO:
if (flags & DIR_SCAN_NO_FIFO)
continue;
break;
default:
break;
}
if ((flags & DIR_SCAN_ONE_FILESYSTEM) && sb.st_dev != devstart)
continue;
if (S_ISLNK(sb.st_mode)) {
extra = calloc(1, sb.st_size + 1);
if (extra == NULL)
goto fail_rdlink;
if (readlinkat(dir_fd, ent->d_name,
extra, sb.st_size) < 0) {
goto fail_rdlink;
}
extra[sb.st_size] = '\0';
}
if (!(flags & DIR_SCAN_KEEP_TIME))
sb.st_mtime = fs->defaults.st_mtime;
if (S_ISDIR(sb.st_mode) && (flags & DIR_SCAN_NO_DIR)) {
n = fstree_get_node_by_path(fs, root, ent->d_name,
false, false);
if (n == NULL)
continue;
ret = 0;
} else {
n = fstree_mknode(root, ent->d_name,
strlen(ent->d_name), extra, &sb);
if (n == NULL) {
perror("creating tree node");
goto fail;
}
ret = (cb == NULL) ? 0 : cb(user, fs, n);
}
free(extra);
extra = NULL;
if (ret < 0)
goto fail;
if (ret > 0) {
discard_node(root, n);
continue;
}
if (S_ISDIR(n->mode) && !(flags & DIR_SCAN_NO_RECURSION)) {
childfd = openat(dir_fd, n->name, O_DIRECTORY |
O_RDONLY | O_CLOEXEC);
if (childfd < 0) {
perror(n->name);
goto fail;
}
if (populate_dir(childfd, fs, n, devstart,
cb, user, flags)) {
goto fail;
}
}
}
closedir(dir);
return 0;
fail_rdlink:
perror("readlink");
fail:
closedir(dir);
free(extra);
return -1;
}
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)
{
struct stat sb;
int fd, subfd;
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;
}
fd = open(path, O_DIRECTORY | O_RDONLY | O_CLOEXEC);
if (fd < 0) {
perror(path);
return -1;
}
if (subdir != NULL) {
subfd = openat(fd, subdir, O_DIRECTORY | O_RDONLY | O_CLOEXEC);
if (subfd < 0) {
fprintf(stderr, "%s/%s: %s\n", path, subdir,
strerror(errno));
close(fd);
return -1;
}
close(fd);
fd = subfd;
}
if (fstat(fd, &sb)) {
fprintf(stderr, "%s/%s: %s\n", path,
subdir == NULL ? "" : subdir,
strerror(errno));
close(fd);
return -1;
}
return populate_dir(fd, fs, root, sb.st_dev, cb, user, flags);
}
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);
}
#endif
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