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Copy pathfileops.c
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847 lines (676 loc) · 19.3 KB
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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
#include "fileops.h"
#include "global.h"
#include <ctype.h>
#if GIT_WIN32
#include "win32/findfile.h"
#endif
int git_futils_mkpath2file(const char *file_path, const mode_t mode)
{
return git_futils_mkdir(
file_path, NULL, mode,
GIT_MKDIR_PATH | GIT_MKDIR_SKIP_LAST | GIT_MKDIR_VERIFY_DIR);
}
int git_futils_mktmp(git_buf *path_out, const char *filename, mode_t mode)
{
int fd;
mode_t mask;
p_umask(mask = p_umask(0));
git_buf_sets(path_out, filename);
git_buf_puts(path_out, "_git2_XXXXXX");
if (git_buf_oom(path_out))
return -1;
if ((fd = p_mkstemp(path_out->ptr)) < 0) {
giterr_set(GITERR_OS,
"Failed to create temporary file '%s'", path_out->ptr);
return -1;
}
if (p_chmod(path_out->ptr, (mode & ~mask))) {
giterr_set(GITERR_OS,
"Failed to set permissions on file '%s'", path_out->ptr);
return -1;
}
return fd;
}
int git_futils_creat_withpath(const char *path, const mode_t dirmode, const mode_t mode)
{
int fd;
if (git_futils_mkpath2file(path, dirmode) < 0)
return -1;
fd = p_creat(path, mode);
if (fd < 0) {
giterr_set(GITERR_OS, "Failed to create file '%s'", path);
return -1;
}
return fd;
}
int git_futils_creat_locked(const char *path, const mode_t mode)
{
int fd = p_open(path, O_WRONLY | O_CREAT | O_TRUNC |
O_EXCL | O_BINARY | O_CLOEXEC, mode);
if (fd < 0) {
giterr_set(GITERR_OS, "Failed to create locked file '%s'", path);
return errno == EEXIST ? GIT_ELOCKED : -1;
}
return fd;
}
int git_futils_creat_locked_withpath(const char *path, const mode_t dirmode, const mode_t mode)
{
if (git_futils_mkpath2file(path, dirmode) < 0)
return -1;
return git_futils_creat_locked(path, mode);
}
int git_futils_open_ro(const char *path)
{
int fd = p_open(path, O_RDONLY);
if (fd < 0)
return git_path_set_error(errno, path, "open");
return fd;
}
git_off_t git_futils_filesize(git_file fd)
{
struct stat sb;
if (p_fstat(fd, &sb)) {
giterr_set(GITERR_OS, "Failed to stat file descriptor");
return -1;
}
return sb.st_size;
}
mode_t git_futils_canonical_mode(mode_t raw_mode)
{
if (S_ISREG(raw_mode))
return S_IFREG | GIT_PERMS_CANONICAL(raw_mode);
else if (S_ISLNK(raw_mode))
return S_IFLNK;
else if (S_ISGITLINK(raw_mode))
return S_IFGITLINK;
else if (S_ISDIR(raw_mode))
return S_IFDIR;
else
return 0;
}
int git_futils_readbuffer_fd(git_buf *buf, git_file fd, size_t len)
{
ssize_t read_size = 0;
git_buf_clear(buf);
if (git_buf_grow(buf, len + 1) < 0)
return -1;
/* p_read loops internally to read len bytes */
read_size = p_read(fd, buf->ptr, len);
if (read_size != (ssize_t)len) {
giterr_set(GITERR_OS, "Failed to read descriptor");
git_buf_free(buf);
return -1;
}
buf->ptr[read_size] = '\0';
buf->size = read_size;
return 0;
}
int git_futils_readbuffer_updated(
git_buf *buf, const char *path, time_t *mtime, size_t *size, int *updated)
{
git_file fd;
struct stat st;
bool changed = false;
assert(buf && path && *path);
if (updated != NULL)
*updated = 0;
if (p_stat(path, &st) < 0)
return git_path_set_error(errno, path, "stat");
if (S_ISDIR(st.st_mode)) {
giterr_set(GITERR_INVALID, "requested file is a directory");
return GIT_ENOTFOUND;
}
if (!git__is_sizet(st.st_size+1)) {
giterr_set(GITERR_OS, "Invalid regular file stat for '%s'", path);
return -1;
}
/*
* If we were given a time and/or a size, we only want to read the file
* if it has been modified.
*/
if (size && *size != (size_t)st.st_size)
changed = true;
if (mtime && *mtime != st.st_mtime)
changed = true;
if (!size && !mtime)
changed = true;
if (!changed) {
return 0;
}
if (mtime != NULL)
*mtime = st.st_mtime;
if (size != NULL)
*size = (size_t)st.st_size;
if ((fd = git_futils_open_ro(path)) < 0)
return fd;
if (git_futils_readbuffer_fd(buf, fd, (size_t)st.st_size) < 0) {
p_close(fd);
return -1;
}
p_close(fd);
if (updated != NULL)
*updated = 1;
return 0;
}
int git_futils_readbuffer(git_buf *buf, const char *path)
{
return git_futils_readbuffer_updated(buf, path, NULL, NULL, NULL);
}
int git_futils_writebuffer(
const git_buf *buf, const char *path, int flags, mode_t mode)
{
int fd, error = 0;
if (flags <= 0)
flags = O_CREAT | O_TRUNC | O_WRONLY;
if (!mode)
mode = GIT_FILEMODE_BLOB;
if ((fd = p_open(path, flags, mode)) < 0) {
giterr_set(GITERR_OS, "Could not open '%s' for writing", path);
return fd;
}
if ((error = p_write(fd, git_buf_cstr(buf), git_buf_len(buf))) < 0) {
giterr_set(GITERR_OS, "Could not write to '%s'", path);
(void)p_close(fd);
return error;
}
if ((error = p_close(fd)) < 0)
giterr_set(GITERR_OS, "Error while closing '%s'", path);
return error;
}
int git_futils_mv_withpath(const char *from, const char *to, const mode_t dirmode)
{
if (git_futils_mkpath2file(to, dirmode) < 0)
return -1;
if (p_rename(from, to) < 0) {
giterr_set(GITERR_OS, "Failed to rename '%s' to '%s'", from, to);
return -1;
}
return 0;
}
int git_futils_mmap_ro(git_map *out, git_file fd, git_off_t begin, size_t len)
{
return p_mmap(out, len, GIT_PROT_READ, GIT_MAP_SHARED, fd, begin);
}
int git_futils_mmap_ro_file(git_map *out, const char *path)
{
git_file fd = git_futils_open_ro(path);
git_off_t len;
int result;
if (fd < 0)
return fd;
len = git_futils_filesize(fd);
if (!git__is_sizet(len)) {
giterr_set(GITERR_OS, "File `%s` too large to mmap", path);
return -1;
}
result = git_futils_mmap_ro(out, fd, 0, (size_t)len);
p_close(fd);
return result;
}
void git_futils_mmap_free(git_map *out)
{
p_munmap(out);
}
int git_futils_mkdir(
const char *path,
const char *base,
mode_t mode,
uint32_t flags)
{
int error = -1;
git_buf make_path = GIT_BUF_INIT;
ssize_t root = 0, min_root_len;
char lastch = '/', *tail;
struct stat st;
/* build path and find "root" where we should start calling mkdir */
if (git_path_join_unrooted(&make_path, path, base, &root) < 0)
return -1;
if (make_path.size == 0) {
giterr_set(GITERR_OS, "Attempt to create empty path");
goto done;
}
/* remove trailing slashes on path */
while (make_path.ptr[make_path.size - 1] == '/') {
make_path.size--;
make_path.ptr[make_path.size] = '\0';
}
/* if we are not supposed to made the last element, truncate it */
if ((flags & GIT_MKDIR_SKIP_LAST2) != 0) {
git_buf_rtruncate_at_char(&make_path, '/');
flags |= GIT_MKDIR_SKIP_LAST;
}
if ((flags & GIT_MKDIR_SKIP_LAST) != 0)
git_buf_rtruncate_at_char(&make_path, '/');
/* if nothing left after truncation, then we're done! */
if (!make_path.size) {
error = 0;
goto done;
}
/* if we are not supposed to make the whole path, reset root */
if ((flags & GIT_MKDIR_PATH) == 0)
root = git_buf_rfind(&make_path, '/');
/* advance root past drive name or network mount prefix */
min_root_len = git_path_root(make_path.ptr);
if (root < min_root_len)
root = min_root_len;
while (root >= 0 && make_path.ptr[root] == '/')
++root;
/* clip root to make_path length */
if (root > (ssize_t)make_path.size)
root = (ssize_t)make_path.size; /* i.e. NUL byte of string */
if (root < 0)
root = 0;
/* walk down tail of path making each directory */
for (tail = &make_path.ptr[root]; *tail; *tail = lastch) {
/* advance tail to include next path component */
while (*tail == '/')
tail++;
while (*tail && *tail != '/')
tail++;
/* truncate path at next component */
lastch = *tail;
*tail = '\0';
st.st_mode = 0;
/* make directory */
if (p_mkdir(make_path.ptr, mode) < 0) {
int tmp_errno = giterr_system_last();
/* ignore error if directory already exists */
if (p_stat(make_path.ptr, &st) < 0 || !S_ISDIR(st.st_mode)) {
giterr_system_set(tmp_errno);
giterr_set(GITERR_OS, "Failed to make directory '%s'", make_path.ptr);
goto done;
}
/* with exclusive create, existing dir is an error */
if ((flags & GIT_MKDIR_EXCL) != 0) {
giterr_set(GITERR_OS, "Directory already exists '%s'", make_path.ptr);
error = GIT_EEXISTS;
goto done;
}
}
/* chmod if requested and necessary */
if (((flags & GIT_MKDIR_CHMOD_PATH) != 0 ||
(lastch == '\0' && (flags & GIT_MKDIR_CHMOD) != 0)) &&
st.st_mode != mode &&
(error = p_chmod(make_path.ptr, mode)) < 0) {
giterr_set(GITERR_OS, "Failed to set permissions on '%s'", make_path.ptr);
goto done;
}
}
error = 0;
/* check that full path really is a directory if requested & needed */
if ((flags & GIT_MKDIR_VERIFY_DIR) != 0 &&
lastch != '\0' &&
(p_stat(make_path.ptr, &st) < 0 || !S_ISDIR(st.st_mode))) {
giterr_set(GITERR_OS, "Path is not a directory '%s'", make_path.ptr);
error = GIT_ENOTFOUND;
}
done:
git_buf_free(&make_path);
return error;
}
int git_futils_mkdir_r(const char *path, const char *base, const mode_t mode)
{
return git_futils_mkdir(path, base, mode, GIT_MKDIR_PATH);
}
typedef struct {
const char *base;
size_t baselen;
uint32_t flags;
int depth;
} futils__rmdir_data;
#define FUTILS_MAX_DEPTH 100
static int futils__error_cannot_rmdir(const char *path, const char *filemsg)
{
if (filemsg)
giterr_set(GITERR_OS, "Could not remove directory. File '%s' %s",
path, filemsg);
else
giterr_set(GITERR_OS, "Could not remove directory '%s'", path);
return -1;
}
static int futils__rm_first_parent(git_buf *path, const char *ceiling)
{
int error = GIT_ENOTFOUND;
struct stat st;
while (error == GIT_ENOTFOUND) {
git_buf_rtruncate_at_char(path, '/');
if (!path->size || git__prefixcmp(path->ptr, ceiling) != 0)
error = 0;
else if (p_lstat_posixly(path->ptr, &st) == 0) {
if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
error = p_unlink(path->ptr);
else if (!S_ISDIR(st.st_mode))
error = -1; /* fail to remove non-regular file */
} else if (errno != ENOTDIR)
error = -1;
}
if (error)
futils__error_cannot_rmdir(path->ptr, "cannot remove parent");
return error;
}
static int futils__rmdir_recurs_foreach(void *opaque, git_buf *path)
{
int error = 0;
futils__rmdir_data *data = opaque;
struct stat st;
if (data->depth > FUTILS_MAX_DEPTH)
error = futils__error_cannot_rmdir(
path->ptr, "directory nesting too deep");
else if ((error = p_lstat_posixly(path->ptr, &st)) < 0) {
if (errno == ENOENT)
error = 0;
else if (errno == ENOTDIR) {
/* asked to remove a/b/c/d/e and a/b is a normal file */
if ((data->flags & GIT_RMDIR_REMOVE_BLOCKERS) != 0)
error = futils__rm_first_parent(path, data->base);
else
futils__error_cannot_rmdir(
path->ptr, "parent is not directory");
}
else
error = git_path_set_error(errno, path->ptr, "rmdir");
}
else if (S_ISDIR(st.st_mode)) {
data->depth++;
error = git_path_direach(path, 0, futils__rmdir_recurs_foreach, data);
data->depth--;
if (error < 0)
return error;
if (data->depth == 0 && (data->flags & GIT_RMDIR_SKIP_ROOT) != 0)
return error;
if ((error = p_rmdir(path->ptr)) < 0) {
if ((data->flags & GIT_RMDIR_SKIP_NONEMPTY) != 0 &&
(errno == ENOTEMPTY || errno == EEXIST || errno == EBUSY))
error = 0;
else
error = git_path_set_error(errno, path->ptr, "rmdir");
}
}
else if ((data->flags & GIT_RMDIR_REMOVE_FILES) != 0) {
if (p_unlink(path->ptr) < 0)
error = git_path_set_error(errno, path->ptr, "remove");
}
else if ((data->flags & GIT_RMDIR_SKIP_NONEMPTY) == 0)
error = futils__error_cannot_rmdir(path->ptr, "still present");
return error;
}
static int futils__rmdir_empty_parent(void *opaque, git_buf *path)
{
futils__rmdir_data *data = opaque;
int error = 0;
if (git_buf_len(path) <= data->baselen)
error = GIT_ITEROVER;
else if (p_rmdir(git_buf_cstr(path)) < 0) {
int en = errno;
if (en == ENOENT || en == ENOTDIR) {
/* do nothing */
} else if (en == ENOTEMPTY || en == EEXIST || en == EBUSY) {
error = GIT_ITEROVER;
} else {
error = git_path_set_error(errno, git_buf_cstr(path), "rmdir");
}
}
return error;
}
int git_futils_rmdir_r(
const char *path, const char *base, uint32_t flags)
{
int error;
git_buf fullpath = GIT_BUF_INIT;
futils__rmdir_data data;
/* build path and find "root" where we should start calling mkdir */
if (git_path_join_unrooted(&fullpath, path, base, NULL) < 0)
return -1;
memset(&data, 0, sizeof(data));
data.base = base ? base : "";
data.baselen = base ? strlen(base) : 0;
data.flags = flags;
error = futils__rmdir_recurs_foreach(&data, &fullpath);
/* remove now-empty parents if requested */
if (!error && (flags & GIT_RMDIR_EMPTY_PARENTS) != 0)
error = git_path_walk_up(
&fullpath, base, futils__rmdir_empty_parent, &data);
if (error == GIT_ITEROVER) {
giterr_clear();
error = 0;
}
git_buf_free(&fullpath);
return error;
}
int git_futils_fake_symlink(const char *old, const char *new)
{
int retcode = GIT_ERROR;
int fd = git_futils_creat_withpath(new, 0755, 0644);
if (fd >= 0) {
retcode = p_write(fd, old, strlen(old));
p_close(fd);
}
return retcode;
}
static int cp_by_fd(int ifd, int ofd, bool close_fd_when_done)
{
int error = 0;
char buffer[4096];
ssize_t len = 0;
while (!error && (len = p_read(ifd, buffer, sizeof(buffer))) > 0)
/* p_write() does not have the same semantics as write(). It loops
* internally and will return 0 when it has completed writing.
*/
error = p_write(ofd, buffer, len);
if (len < 0) {
giterr_set(GITERR_OS, "Read error while copying file");
error = (int)len;
}
if (close_fd_when_done) {
p_close(ifd);
p_close(ofd);
}
return error;
}
int git_futils_cp(const char *from, const char *to, mode_t filemode)
{
int ifd, ofd;
if ((ifd = git_futils_open_ro(from)) < 0)
return ifd;
if ((ofd = p_open(to, O_WRONLY | O_CREAT | O_EXCL, filemode)) < 0) {
p_close(ifd);
return git_path_set_error(errno, to, "open for writing");
}
return cp_by_fd(ifd, ofd, true);
}
static int cp_link(const char *from, const char *to, size_t link_size)
{
int error = 0;
ssize_t read_len;
char *link_data = git__malloc(link_size + 1);
GITERR_CHECK_ALLOC(link_data);
read_len = p_readlink(from, link_data, link_size);
if (read_len != (ssize_t)link_size) {
giterr_set(GITERR_OS, "Failed to read symlink data for '%s'", from);
error = -1;
}
else {
link_data[read_len] = '\0';
if (p_symlink(link_data, to) < 0) {
giterr_set(GITERR_OS, "Could not symlink '%s' as '%s'",
link_data, to);
error = -1;
}
}
git__free(link_data);
return error;
}
typedef struct {
const char *to_root;
git_buf to;
ssize_t from_prefix;
uint32_t flags;
uint32_t mkdir_flags;
mode_t dirmode;
} cp_r_info;
#define GIT_CPDIR__MKDIR_DONE_FOR_TO_ROOT (1u << 10)
static int _cp_r_mkdir(cp_r_info *info, git_buf *from)
{
int error = 0;
/* create root directory the first time we need to create a directory */
if ((info->flags & GIT_CPDIR__MKDIR_DONE_FOR_TO_ROOT) == 0) {
error = git_futils_mkdir(
info->to_root, NULL, info->dirmode,
(info->flags & GIT_CPDIR_CHMOD_DIRS) ? GIT_MKDIR_CHMOD : 0);
info->flags |= GIT_CPDIR__MKDIR_DONE_FOR_TO_ROOT;
}
/* create directory with root as base to prevent excess chmods */
if (!error)
error = git_futils_mkdir(
from->ptr + info->from_prefix, info->to_root,
info->dirmode, info->mkdir_flags);
return error;
}
static int _cp_r_callback(void *ref, git_buf *from)
{
int error = 0;
cp_r_info *info = ref;
struct stat from_st, to_st;
bool exists = false;
if ((info->flags & GIT_CPDIR_COPY_DOTFILES) == 0 &&
from->ptr[git_path_basename_offset(from)] == '.')
return 0;
if ((error = git_buf_joinpath(
&info->to, info->to_root, from->ptr + info->from_prefix)) < 0)
return error;
if (!(error = git_path_lstat(info->to.ptr, &to_st)))
exists = true;
else if (error != GIT_ENOTFOUND)
return error;
else {
giterr_clear();
error = 0;
}
if ((error = git_path_lstat(from->ptr, &from_st)) < 0)
return error;
if (S_ISDIR(from_st.st_mode)) {
mode_t oldmode = info->dirmode;
/* if we are not chmod'ing, then overwrite dirmode */
if ((info->flags & GIT_CPDIR_CHMOD_DIRS) == 0)
info->dirmode = from_st.st_mode;
/* make directory now if CREATE_EMPTY_DIRS is requested and needed */
if (!exists && (info->flags & GIT_CPDIR_CREATE_EMPTY_DIRS) != 0)
error = _cp_r_mkdir(info, from);
/* recurse onto target directory */
if (!error && (!exists || S_ISDIR(to_st.st_mode)))
error = git_path_direach(from, 0, _cp_r_callback, info);
if (oldmode != 0)
info->dirmode = oldmode;
return error;
}
if (exists) {
if ((info->flags & GIT_CPDIR_OVERWRITE) == 0)
return 0;
if (p_unlink(info->to.ptr) < 0) {
giterr_set(GITERR_OS, "Cannot overwrite existing file '%s'",
info->to.ptr);
return GIT_EEXISTS;
}
}
/* Done if this isn't a regular file or a symlink */
if (!S_ISREG(from_st.st_mode) &&
(!S_ISLNK(from_st.st_mode) ||
(info->flags & GIT_CPDIR_COPY_SYMLINKS) == 0))
return 0;
/* Make container directory on demand if needed */
if ((info->flags & GIT_CPDIR_CREATE_EMPTY_DIRS) == 0 &&
(error = _cp_r_mkdir(info, from)) < 0)
return error;
/* make symlink or regular file */
if (info->flags & GIT_CPDIR_LINK_FILES) {
error = p_link(from->ptr, info->to.ptr);
} else if (S_ISLNK(from_st.st_mode)) {
error = cp_link(from->ptr, info->to.ptr, (size_t)from_st.st_size);
} else {
mode_t usemode = from_st.st_mode;
if ((info->flags & GIT_CPDIR_SIMPLE_TO_MODE) != 0)
usemode = GIT_PERMS_FOR_WRITE(usemode);
error = git_futils_cp(from->ptr, info->to.ptr, usemode);
}
return error;
}
int git_futils_cp_r(
const char *from,
const char *to,
uint32_t flags,
mode_t dirmode)
{
int error;
git_buf path = GIT_BUF_INIT;
cp_r_info info;
if (git_buf_joinpath(&path, from, "") < 0) /* ensure trailing slash */
return -1;
memset(&info, 0, sizeof(info));
info.to_root = to;
info.flags = flags;
info.dirmode = dirmode;
info.from_prefix = path.size;
git_buf_init(&info.to, 0);
/* precalculate mkdir flags */
if ((flags & GIT_CPDIR_CREATE_EMPTY_DIRS) == 0) {
/* if not creating empty dirs, then use mkdir to create the path on
* demand right before files are copied.
*/
info.mkdir_flags = GIT_MKDIR_PATH | GIT_MKDIR_SKIP_LAST;
if ((flags & GIT_CPDIR_CHMOD_DIRS) != 0)
info.mkdir_flags |= GIT_MKDIR_CHMOD_PATH;
} else {
/* otherwise, we will do simple mkdir as directories are encountered */
info.mkdir_flags =
((flags & GIT_CPDIR_CHMOD_DIRS) != 0) ? GIT_MKDIR_CHMOD : 0;
}
error = _cp_r_callback(&info, &path);
git_buf_free(&path);
git_buf_free(&info.to);
return error;
}
int git_futils_filestamp_check(
git_futils_filestamp *stamp, const char *path)
{
struct stat st;
/* if the stamp is NULL, then always reload */
if (stamp == NULL)
return 1;
if (p_stat(path, &st) < 0)
return GIT_ENOTFOUND;
if (stamp->mtime == (git_time_t)st.st_mtime &&
stamp->size == (git_off_t)st.st_size &&
stamp->ino == (unsigned int)st.st_ino)
return 0;
stamp->mtime = (git_time_t)st.st_mtime;
stamp->size = (git_off_t)st.st_size;
stamp->ino = (unsigned int)st.st_ino;
return 1;
}
void git_futils_filestamp_set(
git_futils_filestamp *target, const git_futils_filestamp *source)
{
assert(target);
if (source)
memcpy(target, source, sizeof(*target));
else
memset(target, 0, sizeof(*target));
}
void git_futils_filestamp_set_from_stat(
git_futils_filestamp *stamp, struct stat *st)
{
if (st) {
stamp->mtime = (git_time_t)st->st_mtime;
stamp->size = (git_off_t)st->st_size;
stamp->ino = (unsigned int)st->st_ino;
} else {
memset(stamp, 0, sizeof(*stamp));
}
}
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