From a095315b3c31f7a419baceac82c26c3c5ac0cd12 Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Tue, 9 Jun 2015 14:27:33 +0200 Subject: build-sys: split internal basic/ library from shared/ basic/ can be used by everything cannot use anything outside of basic/ libsystemd/ can use basic/ cannot use shared/ shared/ can use libsystemd/ --- src/shared/copy.c | 507 ------------------------------------------------------ 1 file changed, 507 deletions(-) delete mode 100644 src/shared/copy.c (limited to 'src/shared/copy.c') diff --git a/src/shared/copy.c b/src/shared/copy.c deleted file mode 100644 index 1282cb88be..0000000000 --- a/src/shared/copy.c +++ /dev/null @@ -1,507 +0,0 @@ -/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ - -/*** - This file is part of systemd. - - Copyright 2014 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see . -***/ - -#include -#include - -#include "util.h" -#include "btrfs-util.h" -#include "copy.h" - -#define COPY_BUFFER_SIZE (16*1024) - -int copy_bytes(int fdf, int fdt, off_t max_bytes, bool try_reflink) { - bool try_sendfile = true; - int r; - - assert(fdf >= 0); - assert(fdt >= 0); - - /* Try btrfs reflinks first. */ - if (try_reflink && max_bytes == (off_t) -1) { - r = btrfs_reflink(fdf, fdt); - if (r >= 0) - return r; - } - - for (;;) { - size_t m = COPY_BUFFER_SIZE; - ssize_t n; - - if (max_bytes != (off_t) -1) { - - if (max_bytes <= 0) - return -EFBIG; - - if ((off_t) m > max_bytes) - m = (size_t) max_bytes; - } - - /* First try sendfile(), unless we already tried */ - if (try_sendfile) { - - n = sendfile(fdt, fdf, NULL, m); - if (n < 0) { - if (errno != EINVAL && errno != ENOSYS) - return -errno; - - try_sendfile = false; - /* use fallback below */ - } else if (n == 0) /* EOF */ - break; - else if (n > 0) - /* Succcess! */ - goto next; - } - - /* As a fallback just copy bits by hand */ - { - char buf[m]; - - n = read(fdf, buf, m); - if (n < 0) - return -errno; - if (n == 0) /* EOF */ - break; - - r = loop_write(fdt, buf, (size_t) n, false); - if (r < 0) - return r; - } - - next: - if (max_bytes != (off_t) -1) { - assert(max_bytes >= n); - max_bytes -= n; - } - } - - return 0; -} - -static int fd_copy_symlink(int df, const char *from, const struct stat *st, int dt, const char *to) { - _cleanup_free_ char *target = NULL; - int r; - - assert(from); - assert(st); - assert(to); - - r = readlinkat_malloc(df, from, &target); - if (r < 0) - return r; - - if (symlinkat(target, dt, to) < 0) - return -errno; - - if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) - return -errno; - - return 0; -} - -static int fd_copy_regular(int df, const char *from, const struct stat *st, int dt, const char *to) { - _cleanup_close_ int fdf = -1, fdt = -1; - struct timespec ts[2]; - int r, q; - - assert(from); - assert(st); - assert(to); - - fdf = openat(df, from, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); - if (fdf < 0) - return -errno; - - fdt = openat(dt, to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, st->st_mode & 07777); - if (fdt < 0) - return -errno; - - r = copy_bytes(fdf, fdt, (off_t) -1, true); - if (r < 0) { - unlinkat(dt, to, 0); - return r; - } - - if (fchown(fdt, st->st_uid, st->st_gid) < 0) - r = -errno; - - if (fchmod(fdt, st->st_mode & 07777) < 0) - r = -errno; - - ts[0] = st->st_atim; - ts[1] = st->st_mtim; - (void) futimens(fdt, ts); - - (void) copy_xattr(fdf, fdt); - - q = close(fdt); - fdt = -1; - - if (q < 0) { - r = -errno; - unlinkat(dt, to, 0); - } - - return r; -} - -static int fd_copy_fifo(int df, const char *from, const struct stat *st, int dt, const char *to) { - int r; - - assert(from); - assert(st); - assert(to); - - r = mkfifoat(dt, to, st->st_mode & 07777); - if (r < 0) - return -errno; - - if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) - r = -errno; - - if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0) - r = -errno; - - return r; -} - -static int fd_copy_node(int df, const char *from, const struct stat *st, int dt, const char *to) { - int r; - - assert(from); - assert(st); - assert(to); - - r = mknodat(dt, to, st->st_mode, st->st_rdev); - if (r < 0) - return -errno; - - if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0) - r = -errno; - - if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0) - r = -errno; - - return r; -} - -static int fd_copy_directory( - int df, - const char *from, - const struct stat *st, - int dt, - const char *to, - dev_t original_device, - bool merge) { - - _cleanup_close_ int fdf = -1, fdt = -1; - _cleanup_closedir_ DIR *d = NULL; - struct dirent *de; - bool created; - int r; - - assert(st); - assert(to); - - if (from) - fdf = openat(df, from, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); - else - fdf = fcntl(df, F_DUPFD_CLOEXEC, 3); - - d = fdopendir(fdf); - if (!d) - return -errno; - fdf = -1; - - r = mkdirat(dt, to, st->st_mode & 07777); - if (r >= 0) - created = true; - else if (errno == EEXIST && merge) - created = false; - else - return -errno; - - fdt = openat(dt, to, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); - if (fdt < 0) - return -errno; - - r = 0; - - if (created) { - struct timespec ut[2] = { - st->st_atim, - st->st_mtim - }; - - if (fchown(fdt, st->st_uid, st->st_gid) < 0) - r = -errno; - - if (fchmod(fdt, st->st_mode & 07777) < 0) - r = -errno; - - (void) futimens(fdt, ut); - (void) copy_xattr(dirfd(d), fdt); - } - - FOREACH_DIRENT(de, d, return -errno) { - struct stat buf; - int q; - - if (fstatat(dirfd(d), de->d_name, &buf, AT_SYMLINK_NOFOLLOW) < 0) { - r = -errno; - continue; - } - - if (buf.st_dev != original_device) - continue; - - if (S_ISREG(buf.st_mode)) - q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name); - else if (S_ISDIR(buf.st_mode)) - q = fd_copy_directory(dirfd(d), de->d_name, &buf, fdt, de->d_name, original_device, merge); - else if (S_ISLNK(buf.st_mode)) - q = fd_copy_symlink(dirfd(d), de->d_name, &buf, fdt, de->d_name); - else if (S_ISFIFO(buf.st_mode)) - q = fd_copy_fifo(dirfd(d), de->d_name, &buf, fdt, de->d_name); - else if (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode)) - q = fd_copy_node(dirfd(d), de->d_name, &buf, fdt, de->d_name); - else - q = -EOPNOTSUPP; - - if (q == -EEXIST && merge) - q = 0; - - if (q < 0) - r = q; - } - - return r; -} - -int copy_tree_at(int fdf, const char *from, int fdt, const char *to, bool merge) { - struct stat st; - - assert(from); - assert(to); - - if (fstatat(fdf, from, &st, AT_SYMLINK_NOFOLLOW) < 0) - return -errno; - - if (S_ISREG(st.st_mode)) - return fd_copy_regular(fdf, from, &st, fdt, to); - else if (S_ISDIR(st.st_mode)) - return fd_copy_directory(fdf, from, &st, fdt, to, st.st_dev, merge); - else if (S_ISLNK(st.st_mode)) - return fd_copy_symlink(fdf, from, &st, fdt, to); - else if (S_ISFIFO(st.st_mode)) - return fd_copy_fifo(fdf, from, &st, fdt, to); - else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) - return fd_copy_node(fdf, from, &st, fdt, to); - else - return -EOPNOTSUPP; -} - -int copy_tree(const char *from, const char *to, bool merge) { - return copy_tree_at(AT_FDCWD, from, AT_FDCWD, to, merge); -} - -int copy_directory_fd(int dirfd, const char *to, bool merge) { - - struct stat st; - - assert(dirfd >= 0); - assert(to); - - if (fstat(dirfd, &st) < 0) - return -errno; - - if (!S_ISDIR(st.st_mode)) - return -ENOTDIR; - - return fd_copy_directory(dirfd, NULL, &st, AT_FDCWD, to, st.st_dev, merge); -} - -int copy_file_fd(const char *from, int fdt, bool try_reflink) { - _cleanup_close_ int fdf = -1; - int r; - - assert(from); - assert(fdt >= 0); - - fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY); - if (fdf < 0) - return -errno; - - r = copy_bytes(fdf, fdt, (off_t) -1, try_reflink); - - (void) copy_times(fdf, fdt); - (void) copy_xattr(fdf, fdt); - - return r; -} - -int copy_file(const char *from, const char *to, int flags, mode_t mode, unsigned chattr_flags) { - int fdt = -1, r; - - assert(from); - assert(to); - - RUN_WITH_UMASK(0000) { - fdt = open(to, flags|O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode); - if (fdt < 0) - return -errno; - } - - if (chattr_flags != 0) - (void) chattr_fd(fdt, chattr_flags, (unsigned) -1); - - r = copy_file_fd(from, fdt, true); - if (r < 0) { - close(fdt); - unlink(to); - return r; - } - - if (close(fdt) < 0) { - unlink_noerrno(to); - return -errno; - } - - return 0; -} - -int copy_file_atomic(const char *from, const char *to, mode_t mode, bool replace, unsigned chattr_flags) { - _cleanup_free_ char *t = NULL; - int r; - - assert(from); - assert(to); - - r = tempfn_random(to, &t); - if (r < 0) - return r; - - r = copy_file(from, t, O_NOFOLLOW|O_EXCL, mode, chattr_flags); - if (r < 0) - return r; - - if (replace) { - r = renameat(AT_FDCWD, t, AT_FDCWD, to); - if (r < 0) - r = -errno; - } else - r = rename_noreplace(AT_FDCWD, t, AT_FDCWD, to); - if (r < 0) { - (void) unlink_noerrno(t); - return r; - } - - return 0; -} - -int copy_times(int fdf, int fdt) { - struct timespec ut[2]; - struct stat st; - usec_t crtime = 0; - - assert(fdf >= 0); - assert(fdt >= 0); - - if (fstat(fdf, &st) < 0) - return -errno; - - ut[0] = st.st_atim; - ut[1] = st.st_mtim; - - if (futimens(fdt, ut) < 0) - return -errno; - - if (fd_getcrtime(fdf, &crtime) >= 0) - (void) fd_setcrtime(fdt, crtime); - - return 0; -} - -int copy_xattr(int fdf, int fdt) { - _cleanup_free_ char *bufa = NULL, *bufb = NULL; - size_t sza = 100, szb = 100; - ssize_t n; - int ret = 0; - const char *p; - - for (;;) { - bufa = malloc(sza); - if (!bufa) - return -ENOMEM; - - n = flistxattr(fdf, bufa, sza); - if (n == 0) - return 0; - if (n > 0) - break; - if (errno != ERANGE) - return -errno; - - sza *= 2; - - free(bufa); - bufa = NULL; - } - - p = bufa; - while (n > 0) { - size_t l; - - l = strlen(p); - assert(l < (size_t) n); - - if (startswith(p, "user.")) { - ssize_t m; - - if (!bufb) { - bufb = malloc(szb); - if (!bufb) - return -ENOMEM; - } - - m = fgetxattr(fdf, p, bufb, szb); - if (m < 0) { - if (errno == ERANGE) { - szb *= 2; - free(bufb); - bufb = NULL; - continue; - } - - return -errno; - } - - if (fsetxattr(fdt, p, bufb, m, 0) < 0) - ret = -errno; - } - - p += l + 1; - n -= l + 1; - } - - return ret; -} -- cgit v1.2.3-54-g00ecf