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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>
#ifdef _WIN32
int fstree_from_dir(fstree_t *fs, tree_node_t *root,
const char *path, unsigned int flags)
{
(void)fs; (void)root; (void)path; (void)flags;
fputs("Packing a directory is not supported on Windows.\n", stderr);
return -1;
}
#else
static int populate_dir(int dir_fd, fstree_t *fs, tree_node_t *root,
dev_t devstart, unsigned int flags)
{
char *extra = NULL;
struct dirent *ent;
struct stat sb;
tree_node_t *n;
int childfd;
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;
}
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;
n = fstree_mknode(root, ent->d_name, strlen(ent->d_name),
extra, &sb);
if (n == NULL) {
perror("creating tree node");
goto fail;
}
free(extra);
extra = NULL;
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, flags))
goto fail;
}
}
closedir(dir);
return 0;
fail_rdlink:
perror("readlink");
fail:
closedir(dir);
free(extra);
return -1;
}
int fstree_from_dir(fstree_t *fs, tree_node_t *root,
const char *path, unsigned int flags)
{
struct stat sb;
int fd;
if (!S_ISDIR(root->mode)) {
fprintf(stderr,
"scanning %s into %s: target is not a directory\n",
path, root->name);
return -1;
}
fd = open(path, O_DIRECTORY | O_RDONLY | O_CLOEXEC);
if (fd < 0) {
perror(path);
return -1;
}
if (fstat(fd, &sb)) {
perror(path);
close(fd);
return -1;
}
return populate_dir(fd, fs, root, sb.st_dev, flags);
}
#endif
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