blob: 2aceb112a5d6554c96e6a2b977a1172870c491dd [file] [log] [blame]
/*
* Copyright (C) 2009-2012 the libgit2 contributors
*
* 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 <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);
}
int git_futils_mktmp(git_buf *path_out, const char *filename)
{
int fd;
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;
}
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;
#ifdef GIT_WIN32
wchar_t buf[GIT_WIN_PATH];
git__utf8_to_16(buf, GIT_WIN_PATH, path);
fd = _wopen(buf, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_EXCL, mode);
#else
fd = open(path, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_EXCL, mode);
#endif
if (fd < 0) {
giterr_set(GITERR_OS, "Failed to create locked file '%s'", path);
return -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) {
if (errno == ENOENT || errno == ENOTDIR)
fd = GIT_ENOTFOUND;
giterr_set(GITERR_OS, "Failed to open '%s'", path);
}
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_CANONICAL_PERMS(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;
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");
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 ((fd = git_futils_open_ro(path)) < 0)
return fd;
if (p_fstat(fd, &st) < 0 || S_ISDIR(st.st_mode) || !git__is_sizet(st.st_size+1)) {
p_close(fd);
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) {
p_close(fd);
return 0;
}
if (mtime != NULL)
*mtime = st.st_mtime;
if (size != NULL)
*size = (size_t)st.st_size;
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_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)
{
git_buf make_path = GIT_BUF_INIT;
ssize_t root = 0;
char lastch, *tail;
/* 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 fail;
}
/* 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_LAST) != 0)
git_buf_rtruncate_at_char(&make_path, '/');
/* if we are not supposed to make the whole path, reset root */
if ((flags & GIT_MKDIR_PATH) == 0)
root = git_buf_rfind(&make_path, '/');
/* clip root to make_path length */
if (root >= (ssize_t)make_path.size)
root = (ssize_t)make_path.size - 1;
if (root < 0)
root = 0;
tail = & make_path.ptr[root];
while (*tail) {
/* advance tail to include next path component */
while (*tail == '/')
tail++;
while (*tail && *tail != '/')
tail++;
/* truncate path at next component */
lastch = *tail;
*tail = '\0';
/* make directory */
if (p_mkdir(make_path.ptr, mode) < 0 &&
(errno != EEXIST || (flags & GIT_MKDIR_EXCL) != 0))
{
giterr_set(GITERR_OS, "Failed to make directory '%s'",
make_path.ptr);
goto fail;
}
/* chmod if requested */
if ((flags & GIT_MKDIR_CHMOD_PATH) != 0 ||
((flags & GIT_MKDIR_CHMOD) != 0 && lastch == '\0'))
{
if (p_chmod(make_path.ptr, mode) < 0) {
giterr_set(GITERR_OS, "Failed to set permissions on '%s'",
make_path.ptr);
goto fail;
}
}
*tail = lastch;
}
git_buf_free(&make_path);
return 0;
fail:
git_buf_free(&make_path);
return -1;
}
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);
}
static int _rmdir_recurs_foreach(void *opaque, git_buf *path)
{
git_directory_removal_type removal_type = *(git_directory_removal_type *)opaque;
if (git_path_isdir(path->ptr) == true) {
if (git_path_direach(path, _rmdir_recurs_foreach, opaque) < 0)
return -1;
if (p_rmdir(path->ptr) < 0) {
if (removal_type == GIT_DIRREMOVAL_ONLY_EMPTY_DIRS && (errno == ENOTEMPTY || errno == EEXIST))
return 0;
giterr_set(GITERR_OS, "Could not remove directory '%s'", path->ptr);
return -1;
}
return 0;
}
if (removal_type == GIT_DIRREMOVAL_FILES_AND_DIRS) {
if (p_unlink(path->ptr) < 0) {
giterr_set(GITERR_OS, "Could not remove directory. File '%s' cannot be removed", path->ptr);
return -1;
}
return 0;
}
if (removal_type == GIT_DIRREMOVAL_EMPTY_HIERARCHY) {
giterr_set(GITERR_OS, "Could not remove directory. File '%s' still present", path->ptr);
return -1;
}
return 0;
}
int git_futils_rmdir_r(
const char *path, const char *base, git_directory_removal_type removal_type)
{
int error;
git_buf fullpath = GIT_BUF_INIT;
assert(removal_type == GIT_DIRREMOVAL_EMPTY_HIERARCHY
|| removal_type == GIT_DIRREMOVAL_FILES_AND_DIRS
|| removal_type == GIT_DIRREMOVAL_ONLY_EMPTY_DIRS);
/* build path and find "root" where we should start calling mkdir */
if (git_path_join_unrooted(&fullpath, path, base, NULL) < 0)
return -1;
error = _rmdir_recurs_foreach(&removal_type, &fullpath);
git_buf_free(&fullpath);
return error;
}
int git_futils_find_system_file(git_buf *path, const char *filename)
{
#ifdef GIT_WIN32
// try to find git.exe/git.cmd on path
if (!win32_find_system_file_using_path(path, filename))
return 0;
// try to find msysgit installation path using registry
if (!win32_find_system_file_using_registry(path, filename))
return 0;
#else
if (git_buf_joinpath(path, "/etc", filename) < 0)
return -1;
if (git_path_exists(path->ptr) == true)
return 0;
#endif
git_buf_clear(path);
giterr_set(GITERR_OS, "The system file '%s' doesn't exist", filename);
return GIT_ENOTFOUND;
}
int git_futils_find_global_file(git_buf *path, const char *filename)
{
#ifdef GIT_WIN32
struct win32_path root;
static const wchar_t *tmpls[4] = {
L"%HOME%\\",
L"%HOMEDRIVE%%HOMEPATH%\\",
L"%USERPROFILE%\\",
NULL,
};
const wchar_t **tmpl;
for (tmpl = tmpls; *tmpl != NULL; tmpl++) {
/* try to expand environment variable, skipping if not set */
if (win32_expand_path(&root, *tmpl) != 0 || root.path[0] == L'%')
continue;
/* try to look up file under path */
if (!win32_find_file(path, &root, filename))
return 0;
/* No error if file not found under %HOME%, b/c we don't trust it,
* but do error if another var is set and yet file is not found.
*/
if (tmpl != tmpls)
break;
}
giterr_set(GITERR_OS, "The global file '%s' doesn't exist", filename);
git_buf_clear(path);
return GIT_ENOTFOUND;
#else
const char *home = getenv("HOME");
if (home == NULL) {
giterr_set(GITERR_OS, "Global file lookup failed. "
"Cannot locate the user's home directory");
return GIT_ENOTFOUND;
}
if (git_buf_joinpath(path, home, filename) < 0)
return -1;
if (git_path_exists(path->ptr) == false) {
giterr_set(GITERR_OS, "The global file '%s' doesn't exist", filename);
git_buf_clear(path);
return GIT_ENOTFOUND;
}
return 0;
#endif
}
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) {
if (errno == ENOENT || errno == ENOTDIR)
ofd = GIT_ENOTFOUND;
giterr_set(GITERR_OS, "Failed to open '%s' for writing", to);
p_close(ifd);
return ofd;
}
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;
static int _cp_r_callback(void *ref, git_buf *from)
{
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 (git_buf_joinpath(
&info->to, info->to_root, from->ptr + info->from_prefix) < 0)
return -1;
if (p_lstat(info->to.ptr, &to_st) < 0) {
if (errno != ENOENT && errno != ENOTDIR) {
giterr_set(GITERR_OS,
"Could not access %s while copying files", info->to.ptr);
return -1;
}
} else
exists = true;
if (git_path_lstat(from->ptr, &from_st) < 0)
return -1;
if (S_ISDIR(from_st.st_mode)) {
int error = 0;
mode_t oldmode = info->dirmode;
/* if we are not chmod'ing, then overwrite dirmode */
if ((info->flags & GIT_CPDIR_CHMOD) == 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 = git_futils_mkdir(
info->to.ptr, NULL, info->dirmode, info->mkdir_flags);
/* recurse onto target directory */
if (!exists || S_ISDIR(to_st.st_mode))
error = git_path_direach(from, _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 -1;
}
}
/* 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 &&
git_futils_mkdir(
info->to.ptr, NULL, info->dirmode, info->mkdir_flags) < 0)
return -1;
/* make symlink or regular file */
if (S_ISLNK(from_st.st_mode))
return cp_link(from->ptr, info->to.ptr, (size_t)from_st.st_size);
else
return git_futils_cp(from->ptr, info->to.ptr, from_st.st_mode);
}
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_sets(&path, from) < 0)
return -1;
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) {
info.mkdir_flags = GIT_MKDIR_PATH | GIT_MKDIR_SKIP_LAST;
if ((flags & GIT_CPDIR_CHMOD) != 0)
info.mkdir_flags |= GIT_MKDIR_CHMOD_PATH;
} else {
info.mkdir_flags =
((flags & GIT_CPDIR_CHMOD) != 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));
}