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nspawn: add -b switch to automatically look for an init binary

This commit is contained in:
Lennart Poettering 2012-04-22 13:37:24 +02:00
parent acda6a054f
commit 0f0dbc46cc
4 changed files with 41 additions and 2 deletions
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2
TODO
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@ -21,6 +21,8 @@ Bugfixes:
Features:
* fix utmp for console logins in containers
* Add pretty name for seats in logind
* nspawn wants dev_setup() for /dev/fd/ and friends?

10
man/systemd-nspawn.xml
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@ -141,6 +141,16 @@
used.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--boot</option></term>
<term><option>-b</option></term>
<listitem><para>Automatically search
for an init binary and invoke it
instead of a shell or a user supplied
program.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--user=</option></term>
<term><option>-u</option></term>

29
src/nspawn/nspawn.c
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@ -56,6 +56,7 @@ static char *arg_directory = NULL;
static char *arg_user = NULL;
static char **arg_controllers = NULL;
static bool arg_private_network = false;
static bool arg_boot = false;
static int help(void) {
@ -63,6 +64,7 @@ static int help(void) {
"Spawn a minimal namespace container for debugging, testing and building.\n\n"
" -h --help Show this help\n"
" -D --directory=NAME Root directory for the container\n"
" -b --boot Boot up full system (i.e. invoke init)\n"
" -u --user=USER Run the command under specified user or uid\n"
" -C --controllers=LIST Put the container in specified comma-separated cgroup hierarchies\n"
" --private-network Disable network in container\n",
@ -83,6 +85,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "user", required_argument, NULL, 'u' },
{ "controllers", required_argument, NULL, 'C' },
{ "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
{ "boot", no_argument, NULL, 'b' },
{ NULL, 0, NULL, 0 }
};
@ -91,7 +94,7 @@ static int parse_argv(int argc, char *argv[]) {
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "+hD:u:C:", options, NULL)) >= 0) {
while ((c = getopt_long(argc, argv, "+hD:u:C:b", options, NULL)) >= 0) {
switch (c) {
@ -133,6 +136,10 @@ static int parse_argv(int argc, char *argv[]) {
arg_private_network = true;
break;
case 'b':
arg_boot = true;
break;
case '?':
return -EINVAL;
@ -1024,7 +1031,25 @@ int main(int argc, char *argv[]) {
setup_hostname();
if (argc > optind)
if (arg_boot) {
char **a;
size_t l;
/* Automatically search for the init system */
l = 1 + argc - optind;
a = newa(char*, l + 1);
memcpy(a + 1, argv + optind, l * sizeof(char*));
a[0] = (char*) "/usr/lib/systemd/systemd";
execve(a[0], a, (char**) envp);
a[0] = (char*) "/lib/systemd/systemd";
execve(a[0], a, (char**) envp);
a[0] = (char*) "/sbin/init";
execve(a[0], a, (char**) envp);
} else if (argc > optind)
execvpe(argv[optind], argv + optind, (char**) envp);
else {
chdir(home ? home : "/root");

2
src/shared/util.h
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@ -100,6 +100,8 @@ bool streq_ptr(const char *a, const char *b);
#define new0(t, n) ((t*) calloc((n), sizeof(t)))
#define newa(t, n) ((t*) alloca(sizeof(t)*(n)))
#define newdup(t, p, n) ((t*) memdup(p, sizeof(t)*(n))
#define malloc0(n) (calloc((n), 1))