| /* |
| * 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)); |
| } |