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Diffstat (limited to 'src/nspawn/nspawn.c')
-rw-r--r--src/nspawn/nspawn.c136
1 files changed, 98 insertions, 38 deletions
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index a4e13bd6aa..370161e9bf 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -79,6 +79,7 @@
#include "nspawn-register.h"
#include "nspawn-settings.h"
#include "nspawn-setuid.h"
+#include "nspawn-stub-pid1.h"
#include "parse-util.h"
#include "path-util.h"
#include "process-util.h"
@@ -114,6 +115,7 @@ typedef enum LinkJournal {
static char *arg_directory = NULL;
static char *arg_template = NULL;
+static char *arg_chdir = NULL;
static char *arg_user = NULL;
static sd_id128_t arg_uuid = {};
static char *arg_machine = NULL;
@@ -122,7 +124,7 @@ static const char *arg_selinux_apifs_context = NULL;
static const char *arg_slice = NULL;
static bool arg_private_network = false;
static bool arg_read_only = false;
-static bool arg_boot = false;
+static StartMode arg_start_mode = START_PID1;
static bool arg_ephemeral = false;
static LinkJournal arg_link_journal = LINK_AUTO;
static bool arg_link_journal_try = false;
@@ -192,7 +194,9 @@ static void help(void) {
" -x --ephemeral Run container with snapshot of root directory, and\n"
" remove it after exit\n"
" -i --image=PATH File system device or disk image for the container\n"
+ " -a --as-pid2 Maintain a stub init as PID1, invoke binary as PID2\n"
" -b --boot Boot up full system (i.e. invoke init)\n"
+ " --chdir=PATH Set working directory in the container\n"
" -u --user=USER Run the command under specified user or uid\n"
" -M --machine=NAME Set the machine name for the container\n"
" --uuid=UUID Set a specific machine UUID for the container\n"
@@ -231,8 +235,8 @@ static void help(void) {
" capability\n"
" --drop-capability=CAP Drop the specified capability from the default set\n"
" --kill-signal=SIGNAL Select signal to use for shutting down PID 1\n"
- " --link-journal=MODE Link up guest journal, one of no, auto, guest, host,\n"
- " try-guest, try-host\n"
+ " --link-journal=MODE Link up guest journal, one of no, auto, guest, \n"
+ " host, try-guest, try-host\n"
" -j Equivalent to --link-journal=try-guest\n"
" --read-only Mount the root directory read-only\n"
" --bind=PATH[:PATH[:OPTIONS]]\n"
@@ -345,6 +349,7 @@ static int parse_argv(int argc, char *argv[]) {
ARG_PRIVATE_USERS,
ARG_KILL_SIGNAL,
ARG_SETTINGS,
+ ARG_CHDIR,
};
static const struct option options[] = {
@@ -355,6 +360,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "ephemeral", no_argument, NULL, 'x' },
{ "user", required_argument, NULL, 'u' },
{ "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
+ { "as-pid2", no_argument, NULL, 'a' },
{ "boot", no_argument, NULL, 'b' },
{ "uuid", required_argument, NULL, ARG_UUID },
{ "read-only", no_argument, NULL, ARG_READ_ONLY },
@@ -389,6 +395,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "private-users", optional_argument, NULL, ARG_PRIVATE_USERS },
{ "kill-signal", required_argument, NULL, ARG_KILL_SIGNAL },
{ "settings", required_argument, NULL, ARG_SETTINGS },
+ { "chdir", required_argument, NULL, ARG_CHDIR },
{}
};
@@ -400,7 +407,7 @@ static int parse_argv(int argc, char *argv[]) {
assert(argc >= 0);
assert(argv);
- while ((c = getopt_long(argc, argv, "+hD:u:bL:M:jS:Z:qi:xp:n", options, NULL)) >= 0)
+ while ((c = getopt_long(argc, argv, "+hD:u:abL:M:jS:Z:qi:xp:n", options, NULL)) >= 0)
switch (c) {
@@ -491,8 +498,23 @@ static int parse_argv(int argc, char *argv[]) {
break;
case 'b':
- arg_boot = true;
- arg_settings_mask |= SETTING_BOOT;
+ if (arg_start_mode == START_PID2) {
+ log_error("--boot and --as-pid2 may not be combined.");
+ return -EINVAL;
+ }
+
+ arg_start_mode = START_BOOT;
+ arg_settings_mask |= SETTING_START_MODE;
+ break;
+
+ case 'a':
+ if (arg_start_mode == START_BOOT) {
+ log_error("--boot and --as-pid2 may not be combined.");
+ return -EINVAL;
+ }
+
+ arg_start_mode = START_PID2;
+ arg_settings_mask |= SETTING_START_MODE;
break;
case ARG_UUID:
@@ -849,6 +871,19 @@ static int parse_argv(int argc, char *argv[]) {
break;
+ case ARG_CHDIR:
+ if (!path_is_absolute(optarg)) {
+ log_error("Working directory %s is not an absolute path.", optarg);
+ return -EINVAL;
+ }
+
+ r = free_and_strdup(&arg_chdir, optarg);
+ if (r < 0)
+ return log_oom();
+
+ arg_settings_mask |= SETTING_WORKING_DIRECTORY;
+ break;
+
case '?':
return -EINVAL;
@@ -859,7 +894,7 @@ static int parse_argv(int argc, char *argv[]) {
if (arg_share_system)
arg_register = false;
- if (arg_boot && arg_share_system) {
+ if (arg_start_mode != START_PID1 && arg_share_system) {
log_error("--boot and --share-system may not be combined.");
return -EINVAL;
}
@@ -907,7 +942,7 @@ static int parse_argv(int argc, char *argv[]) {
if (!arg_parameters)
return log_oom();
- arg_settings_mask |= SETTING_BOOT;
+ arg_settings_mask |= SETTING_START_MODE;
}
/* Load all settings from .nspawn files */
@@ -943,7 +978,7 @@ static int verify_arguments(void) {
return -EINVAL;
}
- if (arg_boot && arg_kill_signal <= 0)
+ if (arg_start_mode == START_BOOT && arg_kill_signal <= 0)
arg_kill_signal = SIGRTMIN+3;
return 0;
@@ -1027,7 +1062,7 @@ static int setup_timezone(const char *dest) {
}
check = strjoina("/usr/share/zoneinfo/", z);
- check = prefix_root(dest, check);
+ check = prefix_roota(dest, check);
if (laccess(check, F_OK) < 0) {
log_warning("Timezone %s does not exist in container, not updating container timezone.", z);
return 0;
@@ -1337,6 +1372,7 @@ static int setup_journal(const char *directory) {
sd_id128_t machine_id, this_id;
_cleanup_free_ char *b = NULL, *d = NULL;
const char *etc_machine_id, *p, *q;
+ bool try;
char *id;
int r;
@@ -1344,16 +1380,21 @@ static int setup_journal(const char *directory) {
if (arg_ephemeral)
return 0;
+ if (arg_link_journal == LINK_NO)
+ return 0;
+
+ try = arg_link_journal_try || arg_link_journal == LINK_AUTO;
+
etc_machine_id = prefix_roota(directory, "/etc/machine-id");
r = read_one_line_file(etc_machine_id, &b);
- if (r == -ENOENT && arg_link_journal == LINK_AUTO)
+ if (r == -ENOENT && try)
return 0;
else if (r < 0)
return log_error_errno(r, "Failed to read machine ID from %s: %m", etc_machine_id);
id = strstrip(b);
- if (isempty(id) && arg_link_journal == LINK_AUTO)
+ if (isempty(id) && try)
return 0;
/* Verify validity */
@@ -1366,16 +1407,13 @@ static int setup_journal(const char *directory) {
return log_error_errno(r, "Failed to retrieve machine ID: %m");
if (sd_id128_equal(machine_id, this_id)) {
- log_full(arg_link_journal == LINK_AUTO ? LOG_WARNING : LOG_ERR,
+ log_full(try ? LOG_WARNING : LOG_ERR,
"Host and machine ids are equal (%s): refusing to link journals", id);
- if (arg_link_journal == LINK_AUTO)
+ if (try)
return 0;
return -EEXIST;
}
- if (arg_link_journal == LINK_NO)
- return 0;
-
r = userns_mkdir(directory, "/var", 0755, 0, 0);
if (r < 0)
return log_error_errno(r, "Failed to create /var: %m");
@@ -1392,21 +1430,19 @@ static int setup_journal(const char *directory) {
q = prefix_roota(directory, p);
if (path_is_mount_point(p, 0) > 0) {
- if (arg_link_journal != LINK_AUTO) {
- log_error("%s: already a mount point, refusing to use for journal", p);
- return -EEXIST;
- }
+ if (try)
+ return 0;
- return 0;
+ log_error("%s: already a mount point, refusing to use for journal", p);
+ return -EEXIST;
}
if (path_is_mount_point(q, 0) > 0) {
- if (arg_link_journal != LINK_AUTO) {
- log_error("%s: already a mount point, refusing to use for journal", q);
- return -EEXIST;
- }
+ if (try)
+ return 0;
- return 0;
+ log_error("%s: already a mount point, refusing to use for journal", q);
+ return -EEXIST;
}
r = readlink_and_make_absolute(p, &d);
@@ -1440,7 +1476,7 @@ static int setup_journal(const char *directory) {
if (arg_link_journal == LINK_GUEST) {
if (symlink(q, p) < 0) {
- if (arg_link_journal_try) {
+ if (try) {
log_debug_errno(errno, "Failed to symlink %s to %s, skipping journal setup: %m", q, p);
return 0;
} else
@@ -1456,9 +1492,9 @@ static int setup_journal(const char *directory) {
if (arg_link_journal == LINK_HOST) {
/* don't create parents here -- if the host doesn't have
* permanent journal set up, don't force it here */
- r = mkdir(p, 0755);
- if (r < 0) {
- if (arg_link_journal_try) {
+
+ if (mkdir(p, 0755) < 0 && errno != EEXIST) {
+ if (try) {
log_debug_errno(errno, "Failed to create %s, skipping journal setup: %m", p);
return 0;
} else
@@ -1482,7 +1518,7 @@ static int setup_journal(const char *directory) {
}
static int drop_capabilities(void) {
- return capability_bounding_set_drop(~arg_retain, false);
+ return capability_bounding_set_drop(arg_retain, false);
}
static int reset_audit_loginuid(void) {
@@ -2562,6 +2598,16 @@ static int inner_child(
return -ESRCH;
}
+ if (arg_chdir)
+ if (chdir(arg_chdir) < 0)
+ return log_error_errno(errno, "Failed to change to specified working directory %s: %m", arg_chdir);
+
+ if (arg_start_mode == START_PID2) {
+ r = stub_pid1();
+ if (r < 0)
+ return r;
+ }
+
/* Now, explicitly close the log, so that we
* then can close all remaining fds. Closing
* the log explicitly first has the benefit
@@ -2573,7 +2619,7 @@ static int inner_child(
log_close();
(void) fdset_close_others(fds);
- if (arg_boot) {
+ if (arg_start_mode == START_BOOT) {
char **a;
size_t m;
@@ -2597,7 +2643,9 @@ static int inner_child(
} else if (!strv_isempty(arg_parameters))
execvpe(arg_parameters[0], arg_parameters, env_use);
else {
- chdir(home ?: "/root");
+ if (!arg_chdir)
+ chdir(home ?: "/root");
+
execle("/bin/bash", "-bash", NULL, env_use);
execle("/bin/sh", "-sh", NULL, env_use);
}
@@ -2893,15 +2941,22 @@ static int load_settings(void) {
/* Copy over bits from the settings, unless they have been
* explicitly masked by command line switches. */
- if ((arg_settings_mask & SETTING_BOOT) == 0 &&
- settings->boot >= 0) {
- arg_boot = settings->boot;
+ if ((arg_settings_mask & SETTING_START_MODE) == 0 &&
+ settings->start_mode >= 0) {
+ arg_start_mode = settings->start_mode;
strv_free(arg_parameters);
arg_parameters = settings->parameters;
settings->parameters = NULL;
}
+ if ((arg_settings_mask & SETTING_WORKING_DIRECTORY) == 0 &&
+ settings->working_directory) {
+ free(arg_chdir);
+ arg_chdir = settings->working_directory;
+ settings->working_directory = NULL;
+ }
+
if ((arg_settings_mask & SETTING_ENVIRONMENT) == 0 &&
settings->environment) {
strv_free(arg_setenv);
@@ -3043,6 +3098,10 @@ int main(int argc, char *argv[]) {
log_parse_environment();
log_open();
+ /* Make sure rename_process() in the stub init process can work */
+ saved_argv = argv;
+ saved_argc = argc;
+
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
@@ -3149,7 +3208,7 @@ int main(int argc, char *argv[]) {
}
}
- if (arg_boot) {
+ if (arg_start_mode == START_BOOT) {
if (path_is_os_tree(arg_directory) <= 0) {
log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", arg_directory);
r = -EINVAL;
@@ -3628,6 +3687,7 @@ finish:
free(arg_image);
free(arg_machine);
free(arg_user);
+ free(arg_chdir);
strv_free(arg_setenv);
free(arg_network_bridge);
strv_free(arg_network_interfaces);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-26 05:46:19 +0000