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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 "mkfs.h"
#ifdef HAVE_SYS_XATTR_H
static int populate_xattr(sqfs_xattr_writer_t *xwr, tree_node_t *node)
{
char *key, *value = NULL, *buffer = NULL;
ssize_t buflen, vallen, keylen;
int ret;
buflen = listxattr(node->name, NULL, 0);
if (buflen < 0) {
perror("listxattr");
return -1;
}
if (buflen == 0)
return 0;
buffer = malloc(buflen);
if (buffer == NULL) {
perror("xattr name buffer");
return -1;
}
buflen = listxattr(node->name, buffer, buflen);
if (buflen == -1) {
perror("listxattr");
goto fail;
}
key = buffer;
while (buflen > 0) {
vallen = getxattr(node->name, key, NULL, 0);
if (vallen == -1)
goto fail;
if (vallen > 0) {
value = calloc(1, vallen);
if (value == NULL) {
perror("allocating xattr value buffer");
goto fail;
}
vallen = getxattr(node->name, key, value, vallen);
if (vallen == -1) {
fprintf(stderr, "%s: getxattr: %s\n",
node->name, strerror(errno));
goto fail;
}
ret = sqfs_xattr_writer_add(xwr, key, value, vallen);
if (ret) {
sqfs_perror(node->name,
"storing xattr key-value pairs",
ret);
goto fail;
}
free(value);
value = NULL;
}
keylen = strlen(key) + 1;
buflen -= keylen;
key += keylen;
}
free(buffer);
return 0;
fail:
free(value);
free(buffer);
return -1;
}
#endif
static int populate_dir(fstree_t *fs, tree_node_t *root, dev_t devstart,
void *selinux_handle, sqfs_xattr_writer_t *xwr,
unsigned int flags)
{
char *extra = NULL, *path;
struct dirent *ent;
struct stat sb;
tree_node_t *n;
DIR *dir;
int ret;
dir = opendir(".");
if (dir == NULL) {
perror("opendir");
return -1;
}
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(AT_FDCWD, 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 (readlink(ent->d_name, extra, sb.st_size) < 0)
goto fail_rdlink;
extra[sb.st_size] = '\0';
}
if (!(flags & DIR_SCAN_KEEP_TIME))
sb.st_mtim = fs->defaults.st_mtim;
n = fstree_mknode(root, ent->d_name, strlen(ent->d_name),
extra, &sb);
if (n == NULL) {
perror("creating tree node");
goto fail;
}
if (sqfs_xattr_writer_begin(xwr)) {
fputs("error recoding xattr key-value pairs\n", stderr);
return -1;
}
#ifdef HAVE_SYS_XATTR_H
if (flags & DIR_SCAN_READ_XATTR) {
if (populate_xattr(xwr, n))
goto fail;
}
#endif
if (selinux_handle != NULL) {
path = fstree_get_path(n);
if (path == NULL) {
perror("getting full path for "
"SELinux relabeling");
goto fail;
}
if (selinux_relable_node(selinux_handle, xwr,
n, path)) {
free(path);
goto fail;
}
free(path);
}
ret = sqfs_xattr_writer_end(xwr, &n->xattr_idx);
if (ret) {
sqfs_perror(n->name,
"completing xattr key-value pairs", ret);
goto fail;
}
free(extra);
extra = NULL;
}
closedir(dir);
for (n = root->data.dir.children; n != NULL; n = n->next) {
if (S_ISDIR(n->mode)) {
if (pushd(n->name))
return -1;
if (populate_dir(fs, n, devstart, selinux_handle,
xwr, flags)) {
return -1;
}
if (popd())
return -1;
}
}
return 0;
fail_rdlink:
perror("readlink");
fail:
closedir(dir);
free(extra);
return -1;
}
int fstree_from_dir(fstree_t *fs, const char *path, void *selinux_handle,
sqfs_xattr_writer_t *xwr, unsigned int flags)
{
struct stat sb;
int ret;
if (stat(path, &sb)) {
perror(path);
return -1;
}
if (pushd(path))
return -1;
ret = populate_dir(fs, fs->root, sb.st_dev, selinux_handle,
xwr, flags);
if (popd())
ret = -1;
return ret;
}
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