tree-wide: drop license boilerplate

[thirdparty/systemd.git] / src / shared / machine-pool.c

diff --git a/src/shared/machine-pool.c b/src/shared/machine-pool.c
index 4172a63fd056ddd507fa3fa85515648c0575bcb6..e4713b9f4e01df5d1903d81653a5a3d358310807 100644 (file)
--- a/src/shared/machine-pool.c
+++ b/src/shared/machine-pool.c
@@ -1,36 +1,40 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
+/* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.
 
   Copyright 2015 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 <http://www.gnu.org/licenses/>.
 ***/
 
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/loop.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
 #include <sys/mount.h>
 #include <sys/prctl.h>
+#include <sys/stat.h>
+#include <sys/statfs.h>
 #include <sys/statvfs.h>
-#include <sys/vfs.h>
+#include <unistd.h>
+
+#include "sd-bus-protocol.h"
+#include "sd-bus.h"
 
 #include "alloc-util.h"
 #include "btrfs-util.h"
 #include "fd-util.h"
 #include "fileio.h"
 #include "fs-util.h"
+#include "label.h"
 #include "lockfile-util.h"
+#include "log.h"
 #include "machine-pool.h"
+#include "macro.h"
+#include "missing.h"
 #include "mkdir.h"
 #include "mount-util.h"
 #include "parse-util.h"
@@ -39,7 +43,6 @@
 #include "signal-util.h"
 #include "stat-util.h"
 #include "string-util.h"
-#include "util.h"
 
 #define VAR_LIB_MACHINES_SIZE_START (1024UL*1024UL*500UL)
 #define VAR_LIB_MACHINES_FREE_MIN (1024UL*1024UL*750UL)
@@ -63,7 +66,6 @@ static int setup_machine_raw(uint64_t size, sd_bus_error *error) {
         _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
@@ -74,11 +76,8 @@ static int setup_machine_raw(uint64_t size, sd_bus_error *error) {
          * /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 (fd >= 0)
+                return TAKE_FD(fd);
 
         if (errno != ENOENT)
                 return sd_bus_error_set_errnof(error, errno, "Failed to open /var/lib/machines.raw: %m");
@@ -107,47 +106,37 @@ static int setup_machine_raw(uint64_t size, sd_bus_error *error) {
                 goto fail;
         }
 
-        pid = fork();
-        if (pid < 0) {
-                r = sd_bus_error_set_errnof(error, errno, "Failed to fork mkfs.btrfs: %m");
+        r = safe_fork("(mkfs)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &pid);
+        if (r < 0) {
+                sd_bus_error_set_errnof(error, r, "Failed to fork mkfs.btrfs: %m");
                 goto fail;
         }
-
-        if (pid == 0) {
+        if (r == 0) {
 
                 /* Child */
 
-                (void) reset_all_signal_handlers();
-                (void) 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(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;
-        }
-
+        r = wait_for_terminate_and_check("mkfs", pid, 0);
         pid = 0;
 
-        if (si.si_code != CLD_EXITED) {
-                r = sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "mkfs.btrfs died abnormally.");
+        if (r < 0) {
+                sd_bus_error_set_errnof(error, r, "Failed to wait for mkfs.btrfs: %m");
                 goto fail;
         }
-        if (si.si_status == 99) {
+        if (r == 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);
+        if (r != EXIT_SUCCESS) {
+                r = sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "mkfs.btrfs failed with error code %i", r);
                 goto fail;
         }
 
@@ -157,10 +146,7 @@ static int setup_machine_raw(uint64_t size, sd_bus_error *error) {
                 goto fail;
         }
 
-        r = fd;
-        fd = -1;
-
-        return r;
+        return TAKE_FD(fd);
 
 fail:
         unlink_noerrno(tmp);
@@ -211,7 +197,7 @@ int setup_machine_directory(uint64_t size, sd_bus_error *error) {
                 return 1;
         }
 
-        if (path_is_mount_point("/var/lib/machines", AT_SYMLINK_FOLLOW) > 0) {
+        if (path_is_mount_point("/var/lib/machines", NULL, AT_SYMLINK_FOLLOW) > 0) {
                 log_debug("/var/lib/machines is already a mount point, not creating loopback file for it.");
                 return 0;
         }
@@ -225,10 +211,8 @@ int setup_machine_directory(uint64_t size, sd_bus_error *error) {
         }
 
         r = mkfs_exists("btrfs");
-        if (r == -ENOENT) {
-                log_debug("mkfs.btrfs is missing, cannot create loopback file for /var/lib/machines.");
-                return 0;
-        }
+        if (r == 0)
+                return sd_bus_error_set_errnof(error, ENOENT, "Cannot set up /var/lib/machines, mkfs.btrfs is missing");
         if (r < 0)
                 return r;