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nspawn: allow spawning ephemeral nspawn containers based on the root file system of the OS

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This works now:

        # systemd-nspawn -xb -D / -M foobar

Which boots up an ephemeral container, based on the host's root file
system. Or in other words: you can now run the very same host OS you
booted your system with also in a container, on top of it, without
having it interfere. Great for testing whether the init system you are
hacking on still boots without reboot the system!
This commit is contained in:
Lennart Poettering
2014-12-12 17:30:25 +01:00
parent df9a75e480
commit c4e34a612c
3 changed files with 68 additions and 5 deletions
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src/nspawn/nspawn.c
+17 -3
View File
@@ -2942,8 +2942,8 @@ int main(int argc, char *argv[]) {
if (arg_directory) {
assert(!arg_image);
if (path_equal(arg_directory, "/")) {
log_error("Spawning container on root directory not supported.");
if (path_equal(arg_directory, "/") && !arg_ephemeral) {
log_error("Spawning container on root directory is not supported. Consider using --ephemeral.");
r = -EINVAL;
goto finish;
}
@@ -2964,7 +2964,21 @@ int main(int argc, char *argv[]) {
} else if (arg_ephemeral) {
char *np;
r = tempfn_random(arg_directory, &np);
/* If the specified path is a mount point we
* generate the new snapshot immediately
* inside it under a random name. However if
* the specified is not a mount point we
* create the new snapshot in the parent
* directory, just next to it. */
r = path_is_mount_point(arg_directory, false);
if (r < 0) {
log_error_errno(r, "Failed to determine whether directory %s is mount point: %m", arg_directory);
goto finish;
}
if (r > 0)
r = tempfn_random_child(arg_directory, &np);
else
r = tempfn_random(arg_directory, &np);
if (r < 0) {
log_error_errno(r, "Failed to generate name for snapshot: %m");
goto finish;