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-rw-r--r--src/basic/btrfs-util.c39
-rw-r--r--src/basic/btrfs-util.h4
-rw-r--r--src/basic/missing.h4
-rw-r--r--src/import/pull-common.c12
-rw-r--r--src/nspawn/nspawn-mount.c24
-rw-r--r--src/nspawn/nspawn.c123
-rw-r--r--src/shared/machine-image.c39
7 files changed, 170 insertions, 75 deletions
diff --git a/src/basic/btrfs-util.c b/src/basic/btrfs-util.c
index 656bb13719..5f9e21dcba 100644
--- a/src/basic/btrfs-util.c
+++ b/src/basic/btrfs-util.c
@@ -20,6 +20,7 @@
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
+#include <linux/fs.h>
#include <linux/loop.h>
#include <stddef.h>
#include <stdio.h>
@@ -38,6 +39,7 @@
#include "alloc-util.h"
#include "btrfs-ctree.h"
#include "btrfs-util.h"
+#include "chattr-util.h"
#include "copy.h"
#include "fd-util.h"
#include "fileio.h"
@@ -45,6 +47,7 @@
#include "macro.h"
#include "missing.h"
#include "path-util.h"
+#include "rm-rf.h"
#include "selinux-util.h"
#include "smack-util.h"
#include "sparse-endian.h"
@@ -1718,28 +1721,46 @@ int btrfs_subvol_snapshot_fd(int old_fd, const char *new_path, BtrfsSnapshotFlag
if (r < 0)
return r;
if (r == 0) {
+ bool plain_directory = false;
+
+ /* If the source isn't a proper subvolume, fail unless fallback is requested */
if (!(flags & BTRFS_SNAPSHOT_FALLBACK_COPY))
return -EISDIR;
r = btrfs_subvol_make(new_path);
- if (r < 0)
+ if (r == -ENOTTY && (flags & BTRFS_SNAPSHOT_FALLBACK_DIRECTORY)) {
+ /* If the destination doesn't support subvolumes, then use a plain directory, if that's requested. */
+ if (mkdir(new_path, 0755) < 0)
+ return r;
+
+ plain_directory = true;
+ } else if (r < 0)
return r;
r = copy_directory_fd(old_fd, new_path, true);
- if (r < 0) {
- (void) btrfs_subvol_remove(new_path, BTRFS_REMOVE_QUOTA);
- return r;
- }
+ if (r < 0)
+ goto fallback_fail;
if (flags & BTRFS_SNAPSHOT_READ_ONLY) {
- r = btrfs_subvol_set_read_only(new_path, true);
- if (r < 0) {
- (void) btrfs_subvol_remove(new_path, BTRFS_REMOVE_QUOTA);
- return r;
+
+ if (plain_directory) {
+ /* Plain directories have no recursive read-only flag, but something pretty close to
+ * it: the IMMUTABLE bit. Let's use this here, if this is requested. */
+
+ if (flags & BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE)
+ (void) chattr_path(new_path, FS_IMMUTABLE_FL, FS_IMMUTABLE_FL);
+ } else {
+ r = btrfs_subvol_set_read_only(new_path, true);
+ if (r < 0)
+ goto fallback_fail;
}
}
return 0;
+
+ fallback_fail:
+ (void) rm_rf(new_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
+ return r;
}
r = extract_subvolume_name(new_path, &subvolume);
diff --git a/src/basic/btrfs-util.h b/src/basic/btrfs-util.h
index 1d852d502c..04a2e1274b 100644
--- a/src/basic/btrfs-util.h
+++ b/src/basic/btrfs-util.h
@@ -45,10 +45,12 @@ typedef struct BtrfsQuotaInfo {
} BtrfsQuotaInfo;
typedef enum BtrfsSnapshotFlags {
- BTRFS_SNAPSHOT_FALLBACK_COPY = 1,
+ BTRFS_SNAPSHOT_FALLBACK_COPY = 1, /* If the source isn't a subvolume, reflink everything */
BTRFS_SNAPSHOT_READ_ONLY = 2,
BTRFS_SNAPSHOT_RECURSIVE = 4,
BTRFS_SNAPSHOT_QUOTA = 8,
+ BTRFS_SNAPSHOT_FALLBACK_DIRECTORY = 16, /* If the destination doesn't support subvolumes, reflink/copy instead */
+ BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE = 32, /* When we can't create a subvolume, use the FS_IMMUTABLE attribute for indicating read-only */
} BtrfsSnapshotFlags;
typedef enum BtrfsRemoveFlags {
diff --git a/src/basic/missing.h b/src/basic/missing.h
index a5ae5d9e79..8833617dc6 100644
--- a/src/basic/missing.h
+++ b/src/basic/missing.h
@@ -143,6 +143,10 @@
#define GRND_RANDOM 0x0002
#endif
+#ifndef FS_NOCOW_FL
+#define FS_NOCOW_FL 0x00800000
+#endif
+
#ifndef BTRFS_IOCTL_MAGIC
#define BTRFS_IOCTL_MAGIC 0x94
#endif
diff --git a/src/import/pull-common.c b/src/import/pull-common.c
index 2ae2a4174c..5ddc0c56f4 100644
--- a/src/import/pull-common.c
+++ b/src/import/pull-common.c
@@ -144,12 +144,12 @@ int pull_make_local_copy(const char *final, const char *image_root, const char *
if (force_local)
(void) rm_rf(p, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
- r = btrfs_subvol_snapshot(final, p, BTRFS_SNAPSHOT_QUOTA);
- if (r == -ENOTTY) {
- r = copy_tree(final, p, false);
- if (r < 0)
- return log_error_errno(r, "Failed to copy image: %m");
- } else if (r < 0)
+ r = btrfs_subvol_snapshot(final, p,
+ BTRFS_SNAPSHOT_QUOTA|
+ BTRFS_SNAPSHOT_FALLBACK_COPY|
+ BTRFS_SNAPSHOT_FALLBACK_DIRECTORY|
+ BTRFS_SNAPSHOT_RECURSIVE);
+ if (r < 0)
return log_error_errno(r, "Failed to create local image: %m");
log_info("Created new local image '%s'.", local);
diff --git a/src/nspawn/nspawn-mount.c b/src/nspawn/nspawn-mount.c
index 95bb3c09b0..91cb0861d3 100644
--- a/src/nspawn/nspawn-mount.c
+++ b/src/nspawn/nspawn-mount.c
@@ -298,7 +298,7 @@ int mount_sysfs(const char *dest, MountSettingsMask mount_settings) {
MS_BIND|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT|extra_flags, NULL);
}
-static int mkdir_userns(const char *path, mode_t mode, bool in_userns, uid_t uid_shift) {
+static int mkdir_userns(const char *path, mode_t mode, MountSettingsMask mask, uid_t uid_shift) {
int r;
assert(path);
@@ -307,16 +307,20 @@ static int mkdir_userns(const char *path, mode_t mode, bool in_userns, uid_t uid
if (r < 0 && errno != EEXIST)
return -errno;
- if (!in_userns) {
- r = lchown(path, uid_shift, uid_shift);
- if (r < 0)
- return -errno;
- }
+ if ((mask & MOUNT_USE_USERNS) == 0)
+ return 0;
+
+ if (mask & MOUNT_IN_USERNS)
+ return 0;
+
+ r = lchown(path, uid_shift, uid_shift);
+ if (r < 0)
+ return -errno;
return 0;
}
-static int mkdir_userns_p(const char *prefix, const char *path, mode_t mode, bool in_userns, uid_t uid_shift) {
+static int mkdir_userns_p(const char *prefix, const char *path, mode_t mode, MountSettingsMask mask, uid_t uid_shift) {
const char *p, *e;
int r;
@@ -343,12 +347,12 @@ static int mkdir_userns_p(const char *prefix, const char *path, mode_t mode, boo
if (prefix && path_startswith(prefix, t))
continue;
- r = mkdir_userns(t, mode, in_userns, uid_shift);
+ r = mkdir_userns(t, mode, mask, uid_shift);
if (r < 0)
return r;
}
- return mkdir_userns(path, mode, in_userns, uid_shift);
+ return mkdir_userns(path, mode, mask, uid_shift);
}
int mount_all(const char *dest,
@@ -422,7 +426,7 @@ int mount_all(const char *dest,
if (mount_table[k].what && r > 0)
continue;
- r = mkdir_userns_p(dest, where, 0755, in_userns, uid_shift);
+ r = mkdir_userns_p(dest, where, 0755, mount_settings, uid_shift);
if (r < 0 && r != -EEXIST) {
if (fatal)
return log_error_errno(r, "Failed to create directory %s: %m", where);
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index a6adbbe879..2770770cd0 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -1143,11 +1143,6 @@ static int parse_argv(int argc, char *argv[]) {
return -EINVAL;
}
- if (arg_ephemeral && arg_image) {
- log_error("--ephemeral and --image= may not be combined.");
- return -EINVAL;
- }
-
if (arg_ephemeral && !IN_SET(arg_link_journal, LINK_NO, LINK_AUTO)) {
log_error("--ephemeral and --link-journal= may not be combined.");
return -EINVAL;
@@ -2605,7 +2600,7 @@ static int determine_names(void) {
r = image_find(arg_machine, &i);
if (r < 0)
return log_error_errno(r, "Failed to find image for machine '%s': %m", arg_machine);
- else if (r == 0) {
+ if (r == 0) {
log_error("No image for machine '%s': %m", arg_machine);
return -ENOENT;
}
@@ -2615,14 +2610,14 @@ static int determine_names(void) {
else
r = free_and_strdup(&arg_directory, i->path);
if (r < 0)
- return log_error_errno(r, "Invalid image directory: %m");
+ return log_oom();
if (!arg_ephemeral)
arg_read_only = arg_read_only || i->read_only;
} else
arg_directory = get_current_dir_name();
- if (!arg_directory && !arg_machine) {
+ if (!arg_directory && !arg_image) {
log_error("Failed to determine path, please use -D or -i.");
return -EINVAL;
}
@@ -2633,7 +2628,6 @@ static int determine_names(void) {
arg_machine = gethostname_malloc();
else
arg_machine = strdup(basename(arg_image ?: arg_directory));
-
if (!arg_machine)
return log_oom();
@@ -3795,7 +3789,6 @@ static int run(int master,
l = recv(uid_shift_socket_pair[0], &arg_uid_shift, sizeof arg_uid_shift, 0);
if (l < 0)
return log_error_errno(errno, "Failed to read UID shift: %m");
-
if (l != sizeof arg_uid_shift) {
log_error("Short read while reading UID shift.");
return -EIO;
@@ -4029,7 +4022,7 @@ static int run(int master,
terminate_machine(*pid);
/* Normally redundant, but better safe than sorry */
- kill(*pid, SIGKILL);
+ (void) kill(*pid, SIGKILL);
r = wait_for_container(*pid, &container_status);
*pid = 0;
@@ -4077,11 +4070,12 @@ int main(int argc, char *argv[]) {
_cleanup_fdset_free_ FDSet *fds = NULL;
int r, n_fd_passed, loop_nr = -1, ret = EXIT_SUCCESS;
char veth_name[IFNAMSIZ] = "";
- bool secondary = false, remove_subvol = false;
+ bool secondary = false, remove_directory = false, remove_image = false;
pid_t pid = 0;
union in_addr_union exposed = {};
_cleanup_release_lock_file_ LockFile tree_global_lock = LOCK_FILE_INIT, tree_local_lock = LOCK_FILE_INIT;
- bool interactive, veth_created = false;
+ bool interactive, veth_created = false, remove_tmprootdir = false;
+ char tmprootdir[] = "/tmp/nspawn-root-XXXXXX";
log_parse_environment();
log_open();
@@ -4148,7 +4142,7 @@ int main(int argc, char *argv[]) {
else
r = tempfn_random(arg_directory, "machine.", &np);
if (r < 0) {
- log_error_errno(r, "Failed to generate name for snapshot: %m");
+ log_error_errno(r, "Failed to generate name for directory snapshot: %m");
goto finish;
}
@@ -4158,7 +4152,12 @@ int main(int argc, char *argv[]) {
goto finish;
}
- r = btrfs_subvol_snapshot(arg_directory, np, (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | BTRFS_SNAPSHOT_FALLBACK_COPY | BTRFS_SNAPSHOT_RECURSIVE | BTRFS_SNAPSHOT_QUOTA);
+ r = btrfs_subvol_snapshot(arg_directory, np,
+ (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
+ BTRFS_SNAPSHOT_FALLBACK_COPY |
+ BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
+ BTRFS_SNAPSHOT_RECURSIVE |
+ BTRFS_SNAPSHOT_QUOTA);
if (r < 0) {
log_error_errno(r, "Failed to create snapshot %s from %s: %m", np, arg_directory);
goto finish;
@@ -4168,7 +4167,7 @@ int main(int argc, char *argv[]) {
arg_directory = np;
np = NULL;
- remove_subvol = true;
+ remove_directory = true;
} else {
r = image_path_lock(arg_directory, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
@@ -4182,7 +4181,13 @@ int main(int argc, char *argv[]) {
}
if (arg_template) {
- r = btrfs_subvol_snapshot(arg_template, arg_directory, (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | BTRFS_SNAPSHOT_FALLBACK_COPY | BTRFS_SNAPSHOT_RECURSIVE | BTRFS_SNAPSHOT_QUOTA);
+ r = btrfs_subvol_snapshot(arg_template, arg_directory,
+ (arg_read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
+ BTRFS_SNAPSHOT_FALLBACK_COPY |
+ BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
+ BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE |
+ BTRFS_SNAPSHOT_RECURSIVE |
+ BTRFS_SNAPSHOT_QUOTA);
if (r == -EEXIST) {
if (!arg_quiet)
log_info("Directory %s already exists, not populating from template %s.", arg_directory, arg_template);
@@ -4214,28 +4219,55 @@ int main(int argc, char *argv[]) {
}
} else {
- char template[] = "/tmp/nspawn-root-XXXXXX";
-
assert(arg_image);
assert(!arg_template);
- r = image_path_lock(arg_image, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
- if (r == -EBUSY) {
- r = log_error_errno(r, "Disk image %s is currently busy.", arg_image);
- goto finish;
- }
- if (r < 0) {
- r = log_error_errno(r, "Failed to create image lock: %m");
- goto finish;
+ if (arg_ephemeral) {
+ _cleanup_free_ char *np = NULL;
+
+ r = tempfn_random(arg_image, "machine.", &np);
+ if (r < 0) {
+ log_error_errno(r, "Failed to generate name for image snapshot: %m");
+ goto finish;
+ }
+
+ r = image_path_lock(np, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
+ if (r < 0) {
+ r = log_error_errno(r, "Failed to create image lock: %m");
+ goto finish;
+ }
+
+ r = copy_file(arg_image, np, O_EXCL, arg_read_only ? 0400 : 0600, FS_NOCOW_FL);
+ if (r < 0) {
+ r = log_error_errno(r, "Failed to copy image file: %m");
+ goto finish;
+ }
+
+ free(arg_image);
+ arg_image = np;
+ np = NULL;
+
+ remove_image = true;
+ } else {
+ r = image_path_lock(arg_image, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
+ if (r == -EBUSY) {
+ r = log_error_errno(r, "Disk image %s is currently busy.", arg_image);
+ goto finish;
+ }
+ if (r < 0) {
+ r = log_error_errno(r, "Failed to create image lock: %m");
+ goto finish;
+ }
}
- if (!mkdtemp(template)) {
- log_error_errno(errno, "Failed to create temporary directory: %m");
- r = -errno;
+ if (!mkdtemp(tmprootdir)) {
+ r = log_error_errno(errno, "Failed to create temporary directory: %m");
goto finish;
}
- arg_directory = strdup(template);
+ remove_tmprootdir = true;
+
+ arg_directory = strdup(tmprootdir);
if (!arg_directory) {
r = log_oom();
goto finish;
@@ -4255,6 +4287,10 @@ int main(int argc, char *argv[]) {
&secondary);
if (r < 0)
goto finish;
+
+ /* Now that we mounted the image, let's try to remove it again, if it is ephemeral */
+ if (remove_image && unlink(arg_image) >= 0)
+ remove_image = false;
}
r = custom_mounts_prepare();
@@ -4321,20 +4357,35 @@ finish:
"STOPPING=1\nSTATUS=Terminating...");
if (pid > 0)
- kill(pid, SIGKILL);
+ (void) kill(pid, SIGKILL);
/* Try to flush whatever is still queued in the pty */
- if (master >= 0)
+ if (master >= 0) {
(void) copy_bytes(master, STDOUT_FILENO, (uint64_t) -1, false);
+ master = safe_close(master);
+ }
+
+ if (pid > 0)
+ (void) wait_for_terminate(pid, NULL);
loop_remove(loop_nr, &image_fd);
- if (remove_subvol && arg_directory) {
+ if (remove_directory && arg_directory) {
int k;
- k = btrfs_subvol_remove(arg_directory, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA);
+ k = rm_rf(arg_directory, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
if (k < 0)
- log_warning_errno(k, "Cannot remove subvolume '%s', ignoring: %m", arg_directory);
+ log_warning_errno(k, "Cannot remove '%s', ignoring: %m", arg_directory);
+ }
+
+ if (remove_image && arg_image) {
+ if (unlink(arg_image) < 0)
+ log_warning_errno(errno, "Can't remove image file '%s', ignoring: %m", arg_image);
+ }
+
+ if (remove_tmprootdir) {
+ if (rmdir(tmprootdir) < 0)
+ log_debug_errno(errno, "Can't remove temporary root directory '%s', ignoring: %m", tmprootdir);
}
if (arg_machine) {
diff --git a/src/shared/machine-image.c b/src/shared/machine-image.c
index 6414ba5246..712aff65b9 100644
--- a/src/shared/machine-image.c
+++ b/src/shared/machine-image.c
@@ -27,18 +27,20 @@
#include <sys/stat.h>
#include <unistd.h>
#include <linux/fs.h>
+
#include "alloc-util.h"
#include "btrfs-util.h"
#include "chattr-util.h"
#include "copy.h"
#include "dirent-util.h"
+#include "env-util.h"
#include "fd-util.h"
#include "fs-util.h"
#include "hashmap.h"
#include "lockfile-util.h"
#include "log.h"
-#include "macro.h"
#include "machine-image.h"
+#include "macro.h"
#include "mkdir.h"
#include "path-util.h"
#include "rm-rf.h"
@@ -607,14 +609,14 @@ int image_clone(Image *i, const char *new_name, bool read_only) {
new_path = strjoina("/var/lib/machines/", new_name);
- r = btrfs_subvol_snapshot(i->path, new_path, (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) | BTRFS_SNAPSHOT_FALLBACK_COPY | BTRFS_SNAPSHOT_RECURSIVE | BTRFS_SNAPSHOT_QUOTA);
- if (r == -EOPNOTSUPP) {
- /* No btrfs snapshots supported, create a normal directory then. */
-
- r = copy_directory(i->path, new_path, false);
- if (r >= 0)
- (void) chattr_path(new_path, read_only ? FS_IMMUTABLE_FL : 0, FS_IMMUTABLE_FL);
- } else if (r >= 0)
+ r = btrfs_subvol_snapshot(i->path, new_path,
+ (read_only ? BTRFS_SNAPSHOT_READ_ONLY : 0) |
+ BTRFS_SNAPSHOT_FALLBACK_COPY |
+ BTRFS_SNAPSHOT_FALLBACK_DIRECTORY |
+ BTRFS_SNAPSHOT_FALLBACK_IMMUTABLE |
+ BTRFS_SNAPSHOT_RECURSIVE |
+ BTRFS_SNAPSHOT_QUOTA);
+ if (r >= 0)
/* Enable "subtree" quotas for the copy, if we didn't copy any quota from the source. */
(void) btrfs_subvol_auto_qgroup(new_path, 0, true);
@@ -723,12 +725,17 @@ int image_path_lock(const char *path, int operation, LockFile *global, LockFile
* uses the device/inode number. This has the benefit that we
* can even lock a tree that is a mount point, correctly. */
- if (path_equal(path, "/"))
- return -EBUSY;
-
if (!path_is_absolute(path))
return -EINVAL;
+ if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) {
+ *local = *global = (LockFile) LOCK_FILE_INIT;
+ return 0;
+ }
+
+ if (path_equal(path, "/"))
+ return -EBUSY;
+
if (stat(path, &st) >= 0) {
if (asprintf(&p, "/run/systemd/nspawn/locks/inode-%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino) < 0)
return -ENOMEM;
@@ -746,7 +753,8 @@ int image_path_lock(const char *path, int operation, LockFile *global, LockFile
release_lock_file(&t);
return r;
}
- }
+ } else
+ *global = (LockFile) LOCK_FILE_INIT;
*local = t;
return 0;
@@ -782,6 +790,11 @@ int image_name_lock(const char *name, int operation, LockFile *ret) {
if (!image_name_is_valid(name))
return -EINVAL;
+ if (getenv_bool("SYSTEMD_NSPAWN_LOCK") == 0) {
+ *ret = (LockFile) LOCK_FILE_INIT;
+ return 0;
+ }
+
if (streq(name, ".host"))
return -EBUSY;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2025-04-06 02:03:14 +0000