diff options
Diffstat (limited to 'src/import')
| -rw-r--r-- | src/import/importd.c | 263 |
1 files changed, 1 insertions, 262 deletions
diff --git a/src/import/importd.c b/src/import/importd.c index f315212685..a6447e1fdd 100644 --- a/src/import/importd.c +++ b/src/import/importd.c @@ -20,9 +20,6 @@ ***/ #include <sys/prctl.h> -#include <sys/vfs.h> -#include <sys/statvfs.h> -#include <sys/mount.h> #include "sd-bus.h" #include "util.h" @@ -34,13 +31,10 @@ #include "mkdir.h" #include "def.h" #include "missing.h" -#include "btrfs-util.h" +#include "machine-pool.h" #include "path-util.h" #include "import-util.h" -#define VAR_LIB_MACHINES_SIZE_START (1024UL*1024UL*500UL) -#define VAR_LIB_MACHINES_FREE_MIN (1024UL*1024UL*750UL) - typedef struct Transfer Transfer; typedef struct Manager Manager; @@ -650,261 +644,6 @@ static Transfer *manager_find(Manager *m, TransferType type, const char *dkr_ind return NULL; } -static int check_btrfs(void) { - struct statfs sfs; - - if (statfs("/var/lib/machines", &sfs) < 0) { - if (errno != ENOENT) - return -errno; - - if (statfs("/var/lib", &sfs) < 0) - return -errno; - } - - return F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC); -} - -static int setup_machine_raw(sd_bus_error *error) { - _cleanup_free_ char *tmp = NULL; - _cleanup_close_ int fd = -1; - struct statvfs ss; - pid_t pid = 0; - siginfo_t si; - int r; - - /* We want to be able to make use of btrfs-specific file - * system features, in particular subvolumes, reflinks and - * quota. Hence, if we detect that /var/lib/machines.raw is - * not located on btrfs, let's create a loopback file, place a - * btrfs file system into it, and mount it to - * /var/lib/machines. */ - - fd = open("/var/lib/machines.raw", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); - if (fd >= 0) { - r = fd; - fd = -1; - return r; - } - - if (errno != ENOENT) - return sd_bus_error_set_errnof(error, errno, "Failed to open /var/lib/machines.raw: %m"); - - r = tempfn_xxxxxx("/var/lib/machines.raw", &tmp); - if (r < 0) - return r; - - (void) mkdir_p_label("/var/lib", 0755); - fd = open(tmp, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0600); - if (fd < 0) - return sd_bus_error_set_errnof(error, errno, "Failed to create /var/lib/machines.raw: %m"); - - if (fstatvfs(fd, &ss) < 0) { - r = sd_bus_error_set_errnof(error, errno, "Failed to determine free space on /var/lib/machines.raw: %m"); - goto fail; - } - - if (ss.f_bsize * ss.f_bavail < VAR_LIB_MACHINES_FREE_MIN) { - r = sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Not enough free disk space to set up /var/lib/machines."); - goto fail; - } - - if (ftruncate(fd, VAR_LIB_MACHINES_SIZE_START) < 0) { - r = sd_bus_error_set_errnof(error, errno, "Failed to enlarge /var/lib/machines.raw: %m"); - goto fail; - } - - pid = fork(); - if (pid < 0) { - r = sd_bus_error_set_errnof(error, errno, "Failed to fork mkfs.btrfs: %m"); - goto fail; - } - - if (pid == 0) { - - /* Child */ - - reset_all_signal_handlers(); - reset_signal_mask(); - assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0); - - fd = safe_close(fd); - - execlp("mkfs.btrfs", "-Lvar-lib-machines", tmp, NULL); - if (errno == ENOENT) - return 99; - - _exit(EXIT_FAILURE); - } - - r = wait_for_terminate(pid, &si); - if (r < 0) { - sd_bus_error_set_errnof(error, r, "Failed to wait for mkfs.btrfs: %m"); - goto fail; - } - - pid = 0; - - if (si.si_code != CLD_EXITED) { - r = sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "mkfs.btrfs died abnormally."); - goto fail; - } - if (si.si_status == 99) { - r = sd_bus_error_set_errnof(error, ENOENT, "Cannot set up /var/lib/machines, mkfs.btrfs is missing"); - goto fail; - } - if (si.si_status != 0) { - r = sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "mkfs.btrfs failed with error code %i", si.si_status); - goto fail; - } - - if (renameat2(AT_FDCWD, tmp, AT_FDCWD, "/var/lib/machines.raw", RENAME_NOREPLACE) < 0) { - r = sd_bus_error_set_errnof(error, errno, "Failed to move /var/lib/machines.raw into place: %m"); - goto fail; - } - - r = fd; - fd = -1; - - return r; - -fail: - if (tmp) - unlink_noerrno(tmp); - - if (pid > 1) - kill_and_sigcont(pid, SIGKILL); - - return r; -} - -static int setup_machine_directory(sd_bus_error *error) { - struct loop_info64 info = { - .lo_flags = LO_FLAGS_AUTOCLEAR, - }; - _cleanup_close_ int fd = -1, control = -1, loop = -1; - _cleanup_free_ char* loopdev = NULL; - char tmpdir[] = "/tmp/import-mount.XXXXXX", *mntdir = NULL; - bool tmpdir_made = false, mntdir_made = false, mntdir_mounted = false; - int r, nr = -1; - - r = check_btrfs(); - if (r < 0) - return sd_bus_error_set_errnof(error, r, "Failed to determine whether /var/lib/machines is located on btrfs: %m"); - if (r > 0) { - (void) btrfs_subvol_make_label("/var/lib/machines"); - - r = btrfs_quota_enable("/var/lib/machines", true); - if (r < 0) - log_warning_errno(r, "Failed to enable quota, ignoring: %m"); - - return 0; - } - - if (path_is_mount_point("/var/lib/machines", true) > 0 || - dir_is_empty("/var/lib/machines") == 0) - return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "/var/lib/machines is not a btrfs file system. Operation is not supported on legacy file systems."); - - fd = setup_machine_raw(error); - if (fd < 0) - return fd; - - control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK); - if (control < 0) - return sd_bus_error_set_errnof(error, errno, "Failed to open /dev/loop-control: %m"); - - nr = ioctl(control, LOOP_CTL_GET_FREE); - if (nr < 0) - return sd_bus_error_set_errnof(error, errno, "Failed to allocate loop device: %m"); - - if (asprintf(&loopdev, "/dev/loop%i", nr) < 0) { - r = -ENOMEM; - goto fail; - } - - loop = open(loopdev, O_CLOEXEC|O_RDWR|O_NOCTTY|O_NONBLOCK); - if (loop < 0) { - r = sd_bus_error_set_errnof(error, errno, "Failed to open loopback device: %m"); - goto fail; - } - - if (ioctl(loop, LOOP_SET_FD, fd) < 0) { - r = sd_bus_error_set_errnof(error, errno, "Failed to bind loopback device: %m"); - goto fail; - } - - if (ioctl(loop, LOOP_SET_STATUS64, &info) < 0) { - r = sd_bus_error_set_errnof(error, errno, "Failed to enable auto-clear for loopback device: %m"); - goto fail; - } - - /* We need to make sure the new /var/lib/machines directory - * has an access mode of 0700 at the time it is first made - * available. mkfs will create it with 0755 however. Hence, - * let's mount the directory into an inaccessible directory - * below /tmp first, fix the access mode, and move it to the - * public place then. */ - - if (!mkdtemp(tmpdir)) { - r = sd_bus_error_set_errnof(error, errno, "Failed to create temporary mount parent directory: %m"); - goto fail; - } - tmpdir_made = true; - - mntdir = strjoina(tmpdir, "/mnt"); - if (mkdir(mntdir, 0700) < 0) { - r = sd_bus_error_set_errnof(error, errno, "Failed to create temporary mount directory: %m"); - goto fail; - } - mntdir_made = true; - - if (mount(loopdev, mntdir, "btrfs", 0, NULL) < 0) { - r = sd_bus_error_set_errnof(error, errno, "Failed to mount loopback device: %m"); - goto fail; - } - mntdir_mounted = true; - - r = btrfs_quota_enable(mntdir, true); - if (r < 0) - log_warning_errno(r, "Failed to enable quota, ignoring: %m"); - - if (chmod(mntdir, 0700) < 0) { - r = sd_bus_error_set_errnof(error, errno, "Failed to fix owner: %m"); - goto fail; - } - - (void) mkdir_p_label("/var/lib/machines", 0700); - - if (mount(mntdir, "/var/lib/machines", NULL, MS_BIND, NULL) < 0) { - r = sd_bus_error_set_errnof(error, errno, "Failed to mount directory into right place: %m"); - goto fail; - } - - (void) umount2(mntdir, MNT_DETACH); - (void) rmdir(mntdir); - (void) rmdir(tmpdir); - - return 0; - -fail: - if (mntdir_mounted) - (void) umount2(mntdir, MNT_DETACH); - - if (mntdir_made) - (void) rmdir(mntdir); - if (tmpdir_made) - (void) rmdir(tmpdir); - - if (loop >= 0) { - (void) ioctl(loop, LOOP_CLR_FD); - loop = safe_close(loop); - } - - if (control >= 0 && nr >= 0) - (void) ioctl(control, LOOP_CTL_REMOVE, nr); - - return r; -} - static int method_pull_tar_or_raw(sd_bus *bus, sd_bus_message *msg, void *userdata, sd_bus_error *error) { _cleanup_(transfer_unrefp) Transfer *t = NULL; const char *remote, *local, *verify, *object; |