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/* extract.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
* Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-only
*/
#include <sys/stat.h>
#include <sys/xattr.h>
#include <unistd.h>
#include "apk_extract.h"
int apk_extract_file(int atfd, const struct apk_file_info *ae,
const char *extract_name, const char *link_target,
struct apk_istream *is,
apk_progress_cb cb, void *cb_ctx, struct apk_digest_ctx *dctx,
unsigned int extract_flags, struct apk_out *out)
{
struct apk_xattr *xattr;
const char *fn = extract_name ?: ae->name;
int fd, r = -1, atflags = 0, ret = 0;
if (!S_ISDIR(ae->mode) && !(extract_flags & APK_EXTRACTF_NO_OVERWRITE)) {
if (unlinkat(atfd, fn, 0) != 0 && errno != ENOENT) return -errno;
}
switch (ae->mode & S_IFMT) {
case S_IFDIR:
r = mkdirat(atfd, fn, ae->mode & 07777);
if (r < 0 && errno != EEXIST)
ret = -errno;
break;
case S_IFREG:
if (ae->link_target == NULL) {
int flags = O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC | O_EXCL;
int fd = openat(atfd, fn, flags, ae->mode & 07777);
if (fd < 0) {
ret = -errno;
break;
}
struct apk_ostream *os = apk_ostream_to_fd(fd);
if (IS_ERR(os)) {
ret = PTR_ERR(os);
break;
}
apk_stream_copy(is, os, ae->size, cb, cb_ctx, dctx);
r = apk_ostream_close(os);
if (r < 0) {
unlinkat(atfd, fn, 0);
ret = r;
}
} else {
r = linkat(atfd, link_target ?: ae->link_target, atfd, fn, 0);
if (r < 0) ret = -errno;
}
break;
case S_IFLNK:
r = symlinkat(link_target ?: ae->link_target, atfd, fn);
if (r < 0) ret = -errno;
atflags |= AT_SYMLINK_NOFOLLOW;
break;
case S_IFBLK:
case S_IFCHR:
case S_IFIFO:
r = mknodat(atfd, fn, ae->mode, ae->device);
if (r < 0) ret = -errno;
break;
}
if (ret) {
apk_err(out, "Failed to create %s: %s", ae->name, strerror(-ret));
return ret;
}
if (!(extract_flags & APK_EXTRACTF_NO_CHOWN)) {
r = fchownat(atfd, fn, ae->uid, ae->gid, atflags);
if (r < 0) {
apk_err(out, "Failed to set ownership on %s: %s",
fn, strerror(errno));
if (!ret) ret = -errno;
}
/* chown resets suid bit so we need set it again */
if (ae->mode & 07000) {
r = fchmodat(atfd, fn, ae->mode & 07777, atflags);
if (r < 0) {
apk_err(out, "Failed to set file permissions on %s: %s",
fn, strerror(errno));
if (!ret) ret = -errno;
}
}
}
/* extract xattrs */
if (!S_ISLNK(ae->mode) && ae->xattrs && ae->xattrs->num) {
r = 0;
fd = openat(atfd, fn, O_RDWR);
if (fd >= 0) {
foreach_array_item(xattr, ae->xattrs) {
if (fsetxattr(fd, xattr->name, xattr->value.ptr, xattr->value.len, 0) < 0) {
r = -errno;
if (r != -ENOTSUP) break;
}
}
close(fd);
} else {
r = -errno;
}
if (r) {
if (r != -ENOTSUP)
apk_err(out, "Failed to set xattrs on %s: %s",
fn, strerror(-r));
if (!ret) ret = r;
}
}
if (!S_ISLNK(ae->mode)) {
/* preserve modification time */
struct timespec times[2];
times[0].tv_sec = times[1].tv_sec = ae->mtime;
times[0].tv_nsec = times[1].tv_nsec = 0;
r = utimensat(atfd, fn, times, atflags);
if (r < 0) {
apk_err(out, "Failed to preserve modification time on %s: %s",
fn, strerror(errno));
if (!ret || ret == -ENOTSUP) ret = -errno;
}
}
return ret;
}
int apk_extract(struct apk_extract_ctx *ectx, struct apk_istream *is)
{
void *sig;
if (IS_ERR(is)) return PTR_ERR(is);
sig = apk_istream_peek(is, 4);
if (IS_ERR(sig)) return apk_istream_close_error(is, PTR_ERR(sig));
if (memcmp(sig, "ADB", 3) == 0) return apk_extract_v3(ectx, is);
return apk_extract_v2(ectx, is);
}
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