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Ensure parent folders exist before extract

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This commit is contained in:
topjohnwu 2022-08-07 04:06:18 -07:00
parent 07b45f39df
commit 1b4a6850b8
3 changed files with 17 additions and 10 deletions
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10
native/src/base/files.cpp
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@ -23,19 +23,21 @@ int fd_pathat(int dirfd, const char *name, char *path, size_t size) {
return 0;
}
int mkdirs(string path, mode_t mode) {
int mkdirs(const char *path, mode_t mode) {
char buf[4096];
strlcpy(buf, path, sizeof(buf));
errno = 0;
for (char *p = path.data() + 1; *p; ++p) {
for (char *p = &buf[1]; *p; ++p) {
if (*p == '/') {
*p = '\0';
if (mkdir(path.data(), mode) == -1) {
if (mkdir(buf, mode) == -1) {
if (errno != EEXIST)
return -1;
}
*p = '/';
}
}
if (mkdir(path.data(), mode) == -1) {
if (mkdir(buf, mode) == -1) {
if (errno != EEXIST)
return -1;
}

2
native/src/base/files.hpp
View File

@ -60,7 +60,7 @@ struct mmap_data : public byte_data {
ssize_t fd_path(int fd, char *path, size_t size);
int fd_pathat(int dirfd, const char *name, char *path, size_t size);
int mkdirs(std::string path, mode_t mode);
int mkdirs(const char *path, mode_t mode);
void rm_rf(const char *path);
void mv_path(const char *src, const char *dest);
void mv_dir(int src, int dest);

15
native/src/boot/cpio.cpp
View File

@ -1,5 +1,6 @@
#include <unistd.h>
#include <fcntl.h>
#include <libgen.h>
#include <algorithm>
#include <base.hpp>
@ -79,17 +80,21 @@ void cpio::extract_entry(const entry_map::value_type &e, const char *file) {
fprintf(stderr, "Extract [%s] to [%s]\n", e.first.data(), file);
unlink(file);
rmdir(file);
// Make sure parent folders exist
char *parent = dirname(file);
xmkdirs(parent, 0755);
if (S_ISDIR(e.second->mode)) {
::mkdir(file, e.second->mode & 0777);
xmkdir(file, e.second->mode & 0777);
} else if (S_ISREG(e.second->mode)) {
int fd = creat(file, e.second->mode & 0777);
int fd = xopen(file, O_CREAT | O_WRONLY | O_TRUNC, e.second->mode & 0777);
xwrite(fd, e.second->data, e.second->filesize);
fchown(fd, e.second->uid, e.second->gid);
close(fd);
} else if (S_ISLNK(e.second->mode)) {
auto target = strndup((char *) e.second->data, e.second->filesize);
} else if (S_ISLNK(e.second->mode) && e.second->filesize < 4096) {
char target[4096];
memcpy(target, e.second->data, e.second->filesize);
target[e.second->filesize] = '\0';
symlink(target, file);
free(target);
}
}