#include "missing.h"
#include "cgroup-util.h"
#include "strv.h"
+#include "path-util.h"
#include "loopback-setup.h"
+#include "sd-id128.h"
+
+typedef enum LinkJournal {
+ LINK_NO,
+ LINK_AUTO,
+ LINK_HOST,
+ LINK_GUEST
+} LinkJournal;
static char *arg_directory = NULL;
static char *arg_user = NULL;
static char **arg_controllers = NULL;
static char *arg_uuid = NULL;
static bool arg_private_network = false;
+static bool arg_read_only = false;
static bool arg_boot = false;
+static LinkJournal arg_link_journal = LINK_AUTO;
+static uint64_t arg_retain =
+ (1ULL << CAP_CHOWN) |
+ (1ULL << CAP_DAC_OVERRIDE) |
+ (1ULL << CAP_DAC_READ_SEARCH) |
+ (1ULL << CAP_FOWNER) |
+ (1ULL << CAP_FSETID) |
+ (1ULL << CAP_IPC_OWNER) |
+ (1ULL << CAP_KILL) |
+ (1ULL << CAP_LEASE) |
+ (1ULL << CAP_LINUX_IMMUTABLE) |
+ (1ULL << CAP_NET_BIND_SERVICE) |
+ (1ULL << CAP_NET_BROADCAST) |
+ (1ULL << CAP_NET_RAW) |
+ (1ULL << CAP_SETGID) |
+ (1ULL << CAP_SETFCAP) |
+ (1ULL << CAP_SETPCAP) |
+ (1ULL << CAP_SETUID) |
+ (1ULL << CAP_SYS_ADMIN) |
+ (1ULL << CAP_SYS_CHROOT) |
+ (1ULL << CAP_SYS_NICE) |
+ (1ULL << CAP_SYS_PTRACE) |
+ (1ULL << CAP_SYS_TTY_CONFIG) |
+ (1ULL << CAP_SYS_RESOURCE);
static int help(void) {
printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
"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"
- " --uuid=UUID Set a specific machine UUID for the container\n"
- " --private-network Disable network in container\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"
+ " --uuid=UUID Set a specific machine UUID for the container\n"
+ " --private-network Disable network in container\n"
+ " --read-only Mount the root directory read-only\n"
+ " --capability=CAP In addition to the default, retain specified capability\n"
+ " --link-journal=MODE Link up guest journal, one of no, auto, guest, host\n"
+ " -j Equivalent to --link-journal=host\n",
program_invocation_short_name);
return 0;
enum {
ARG_PRIVATE_NETWORK = 0x100,
- ARG_UUID
+ ARG_UUID,
+ ARG_READ_ONLY,
+ ARG_CAPABILITY,
+ ARG_LINK_JOURNAL
};
static const struct option options[] = {
{ "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
{ "boot", no_argument, NULL, 'b' },
{ "uuid", required_argument, NULL, ARG_UUID },
+ { "read-only", no_argument, NULL, ARG_READ_ONLY },
+ { "capability", required_argument, NULL, ARG_CAPABILITY },
+ { "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
{ NULL, 0, NULL, 0 }
};
assert(argc >= 0);
assert(argv);
- while ((c = getopt_long(argc, argv, "+hD:u:C:b", options, NULL)) >= 0) {
+ while ((c = getopt_long(argc, argv, "+hD:u:C:bj", options, NULL)) >= 0) {
switch (c) {
arg_uuid = optarg;
break;
+ case ARG_READ_ONLY:
+ arg_read_only = true;
+ break;
+
+ case ARG_CAPABILITY: {
+ char *state, *word;
+ size_t length;
+
+ FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) {
+ cap_value_t cap;
+ char *t;
+
+ t = strndup(word, length);
+ if (!t) {
+ log_error("Out of memory.");
+ return -ENOMEM;
+ }
+
+ if (cap_from_name(t, &cap) < 0) {
+ log_error("Failed to parse capability %s.", t);
+ free(t);
+ return -EINVAL;
+ }
+
+ free(t);
+ arg_retain |= 1ULL << (uint64_t) cap;
+ }
+
+ break;
+ }
+
+ case 'j':
+ arg_link_journal = LINK_GUEST;
+ break;
+
+ case ARG_LINK_JOURNAL:
+ if (streq(optarg, "auto"))
+ arg_link_journal = LINK_AUTO;
+ else if (streq(optarg, "no"))
+ arg_link_journal = LINK_NO;
+ else if (streq(optarg, "guest"))
+ arg_link_journal = LINK_GUEST;
+ else if (streq(optarg, "host"))
+ arg_link_journal = LINK_HOST;
+ else {
+ log_error("Failed to parse link journal mode %s", optarg);
+ return -EINVAL;
+ }
+
+ break;
+
case '?':
return -EINVAL;
continue;
}
- mkdir_p(where, 0755);
+ mkdir_p_label(where, 0755);
if (mount(mount_table[k].what,
where,
return 0;
}
+static int setup_resolv_conf(const char *dest) {
+ char *where;
+
+ assert(dest);
+
+ if (arg_private_network)
+ return 0;
+
+ /* Fix resolv.conf, if possible */
+ if (asprintf(&where, "%s/etc/resolv.conf", dest) < 0) {
+ log_error("Out of memory");
+ return -ENOMEM;
+ }
+
+ if (mount("/etc/resolv.conf", where, "bind", MS_BIND, NULL) >= 0)
+ mount("/etc/resolv.conf", where, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
+
+ free(where);
+
+ return 0;
+}
+
static int copy_devnodes(const char *dest) {
static const char devnodes[] =
char *hn;
int r = 0;
- hn = file_name_from_path(arg_directory);
+ hn = path_get_file_name(arg_directory);
if (hn) {
hn = strdup(hn);
if (!hn)
return r;
}
-static int drop_capabilities(void) {
- static const unsigned long retain[] = {
- CAP_CHOWN,
- CAP_DAC_OVERRIDE,
- CAP_DAC_READ_SEARCH,
- CAP_FOWNER,
- CAP_FSETID,
- CAP_IPC_OWNER,
- CAP_KILL,
- CAP_LEASE,
- CAP_LINUX_IMMUTABLE,
- CAP_NET_BIND_SERVICE,
- CAP_NET_BROADCAST,
- CAP_NET_RAW,
- CAP_SETGID,
- CAP_SETFCAP,
- CAP_SETPCAP,
- CAP_SETUID,
- CAP_SYS_ADMIN,
- CAP_SYS_CHROOT,
- CAP_SYS_NICE,
- CAP_SYS_PTRACE,
- CAP_SYS_TTY_CONFIG
- };
+static int setup_journal(const char *directory) {
+ sd_id128_t machine_id;
+ char *p = NULL, *b = NULL, *l, *q = NULL, *d = NULL;
+ int r;
- unsigned long l;
+ if (arg_link_journal == LINK_NO)
+ return 0;
- for (l = 0; l <= cap_last_cap(); l++) {
- unsigned i;
+ p = strappend(directory, "/etc/machine-id");
+ if (!p) {
+ log_error("Out of memory");
+ r = -ENOMEM;
+ goto finish;
+ }
- for (i = 0; i < ELEMENTSOF(retain); i++)
- if (retain[i] == l)
- break;
+ r = read_one_line_file(p, &b);
+ if (r == -ENOENT && arg_link_journal == LINK_AUTO) {
+ r = 0;
+ goto finish;
+ } else if (r < 0) {
+ log_error("Failed to read machine ID: %s", strerror(-r));
+ return r;
+ }
- if (i < ELEMENTSOF(retain))
- continue;
+ l = strstrip(b);
+ if (isempty(l) && arg_link_journal == LINK_AUTO) {
+ r = 0;
+ goto finish;
+ }
+
+ /* Verify validaty */
+ r = sd_id128_from_string(l, &machine_id);
+ if (r < 0) {
+ log_error("Failed to parse machine ID: %s", strerror(-r));
+ goto finish;
+ }
- if (prctl(PR_CAPBSET_DROP, l) < 0) {
- log_error("PR_CAPBSET_DROP failed: %m");
- return -errno;
+ free(p);
+ p = strappend("/var/log/journal/", l);
+ q = strjoin(directory, "/var/log/journal/", l, NULL);
+ if (!p || !q) {
+ log_error("Out of memory");
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if (path_is_mount_point(p, false) > 0 ||
+ path_is_mount_point(q, false) > 0) {
+ if (arg_link_journal != LINK_AUTO) {
+ log_error("Journal already a mount point, refusing.");
+ r = -EEXIST;
+ goto finish;
}
+
+ r = 0;
+ goto finish;
}
- return 0;
+ r = readlink_and_make_absolute(p, &d);
+ if (r >= 0) {
+ if ((arg_link_journal == LINK_GUEST ||
+ arg_link_journal == LINK_AUTO) &&
+ path_equal(d, q)) {
+
+ mkdir_p(q, 0755);
+
+ r = 0;
+ goto finish;
+ }
+
+ if (unlink(p) < 0) {
+ log_error("Failed to remove symlink %s: %m", p);
+ r = -errno;
+ goto finish;
+ }
+ } else if (r == -EINVAL) {
+
+ if (arg_link_journal == LINK_GUEST &&
+ rmdir(p) < 0) {
+
+ if (errno == ENOTDIR)
+ log_error("%s already exists and is neither symlink nor directory.", p);
+ else {
+ log_error("Failed to remove %s: %m", p);
+ r = -errno;
+ }
+
+ goto finish;
+ }
+ } else if (r != -ENOENT) {
+ log_error("readlink(%s) failed: %m", p);
+ goto finish;
+ }
+
+ if (arg_link_journal == LINK_GUEST) {
+
+ if (symlink(q, p) < 0) {
+ log_error("Failed to symlink %s to %s: %m", q, p);
+ r = -errno;
+ goto finish;
+ }
+
+ mkdir_p(q, 0755);
+
+ r = 0;
+ goto finish;
+ }
+
+ if (arg_link_journal == LINK_HOST) {
+ r = mkdir_p(p, 0755);
+ if (r < 0) {
+ log_error("Failed to create %s: %m", p);
+ goto finish;
+ }
+
+ } else if (access(p, F_OK) < 0) {
+ r = 0;
+ goto finish;
+ }
+
+ if (dir_is_empty(q) == 0) {
+ log_error("%s not empty.", q);
+ r = -ENOTEMPTY;
+ goto finish;
+ }
+
+ r = mkdir_p(q, 0755);
+ if (r < 0) {
+ log_error("Failed to create %s: %m", q);
+ goto finish;
+ }
+
+ if (mount(p, q, "bind", MS_BIND, NULL) < 0) {
+ log_error("Failed to bind mount journal from host into guest: %m");
+ r = -errno;
+ goto finish;
+ }
+
+ r = 0;
+
+finish:
+ free(p);
+ free(q);
+ free(d);
+ free(b);
+ return r;
+
+}
+
+static int drop_capabilities(void) {
+ return capability_bounding_set_drop(~arg_retain, false);
}
static int is_os_tree(const char *path) {
fd_nonblock(STDOUT_FILENO, 1);
fd_nonblock(master, 1);
- if ((signal_fd = signalfd(-1, mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
+ signal_fd = signalfd(-1, mask, SFD_NONBLOCK|SFD_CLOEXEC);
+ if (signal_fd < 0) {
log_error("signalfd(): %m");
r = -errno;
goto finish;
}
- if ((ep = epoll_create1(EPOLL_CLOEXEC)) < 0) {
+ ep = epoll_create1(EPOLL_CLOEXEC);
+ if (ep < 0) {
log_error("Failed to create epoll: %m");
r = -errno;
goto finish;
ssize_t k;
int i, nfds;
- if ((nfds = epoll_wait(ep, ev, ELEMENTSOF(ev), -1)) < 0) {
+ nfds = epoll_wait(ep, ev, ELEMENTSOF(ev), -1);
+ if (nfds < 0) {
if (errno == EINTR || errno == EAGAIN)
continue;
struct signalfd_siginfo sfsi;
ssize_t n;
- if ((n = read(signal_fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
+ n = read(signal_fd, &sfsi, sizeof(sfsi));
+ if (n != sizeof(sfsi)) {
if (n >= 0) {
log_error("Failed to read from signalfd: invalid block size");
if (stdin_readable && in_buffer_full < LINE_MAX) {
- if ((k = read(STDIN_FILENO, in_buffer + in_buffer_full, LINE_MAX - in_buffer_full)) < 0) {
+ k = read(STDIN_FILENO, in_buffer + in_buffer_full, LINE_MAX - in_buffer_full);
+ if (k < 0) {
if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
stdin_readable = false;
if (master_writable && in_buffer_full > 0) {
- if ((k = write(master, in_buffer, in_buffer_full)) < 0) {
+ k = write(master, in_buffer, in_buffer_full);
+ if (k < 0) {
if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
master_writable = false;
if (master_readable && out_buffer_full < LINE_MAX) {
- if ((k = read(master, out_buffer + out_buffer_full, LINE_MAX - out_buffer_full)) < 0) {
+ k = read(master, out_buffer + out_buffer_full, LINE_MAX - out_buffer_full);
+ if (k < 0) {
if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
master_readable = false;
if (stdout_writable && out_buffer_full > 0) {
- if ((k = write(STDOUT_FILENO, out_buffer, out_buffer_full)) < 0) {
+ k = write(STDOUT_FILENO, out_buffer, out_buffer_full);
+ if (k < 0) {
if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO)
stdout_writable = false;
log_parse_environment();
log_open();
- if ((r = parse_argv(argc, argv)) <= 0)
+ r = parse_argv(argc, argv);
+ if (r <= 0)
goto finish;
if (arg_directory) {
goto finish;
}
- if ((k = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, &oldcg)) < 0) {
+ k = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, &oldcg);
+ if (k < 0) {
log_error("Failed to determine current cgroup: %s", strerror(-k));
goto finish;
}
goto finish;
}
- STRV_FOREACH(controller,arg_controllers) {
+ STRV_FOREACH(controller, arg_controllers) {
k = cg_create_and_attach(*controller, newcg, 0);
if (k < 0)
log_warning("Failed to create cgroup in controller %s: %s", *controller, strerror(-k));
}
- if ((master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY)) < 0) {
+ master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);
+ if (master < 0) {
log_error("Failed to acquire pseudo tty: %m");
goto finish;
}
- if (!(console = ptsname(master))) {
+ console = ptsname(master);
+ if (!console) {
log_error("Failed to determine tty name: %m");
goto finish;
}
assert_se(sigemptyset(&mask) == 0);
assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
- if (setsid() < 0)
+ if (open_terminal(console, O_RDWR) != STDIN_FILENO ||
+ dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
+ dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO)
+ goto child_fail;
+
+ if (setsid() < 0) {
+ log_error("setsid() failed: %m");
goto child_fail;
+ }
- if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0)
+ if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0) {
+ log_error("PR_SET_PDEATHSIG failed: %m");
goto child_fail;
+ }
/* Mark / as private, in case somebody marked it shared */
- if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) < 0)
+ if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) < 0) {
+ log_error("MS_PRIVATE|MS_REC failed: %m");
goto child_fail;
+ }
+
+ /* Turn directory into bind mount */
+ if (mount(arg_directory, arg_directory, "bind", MS_BIND, NULL) < 0) {
+ log_error("Failed to make bind mount.");
+ goto child_fail;
+ }
+
+ if (arg_read_only)
+ if (mount(arg_directory, arg_directory, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL) < 0) {
+ log_error("Failed to make read-only.");
+ goto child_fail;
+ }
if (mount_all(arg_directory) < 0)
goto child_fail;
if (setup_timezone(arg_directory) < 0)
goto child_fail;
+ if (setup_resolv_conf(arg_directory) < 0)
+ goto child_fail;
+
+ if (setup_journal(arg_directory) < 0)
+ goto child_fail;
+
if (chdir(arg_directory) < 0) {
log_error("chdir(%s) failed: %m", arg_directory);
goto child_fail;
}
- if (open_terminal("dev/console", O_RDWR) != STDIN_FILENO ||
- dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
- dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO)
- goto child_fail;
-
- if (mount(arg_directory, "/", "bind", MS_BIND, NULL) < 0) {
- log_error("mount(MS_MOVE) failed: %m");
+ if (mount(arg_directory, "/", "bind", MS_MOVE, NULL) < 0) {
+ log_error("mount(MS_BIND) failed: %m");
goto child_fail;
}
loopback_setup();
- if (drop_capabilities() < 0)
+ if (drop_capabilities() < 0) {
+ log_error("drop_capabilities() failed: %m");
goto child_fail;
+ }
if (arg_user) {
- if (get_user_creds((const char**)&arg_user, &uid, &gid, &home) < 0) {
+ if (get_user_creds((const char**)&arg_user, &uid, &gid, &home, NULL) < 0) {
log_error("get_user_creds() failed: %m");
goto child_fail;
}
- if (mkdir_parents(home, 0775) < 0) {
- log_error("mkdir_parents() failed: %m");
+ if (mkdir_parents_label(home, 0775) < 0) {
+ log_error("mkdir_parents_label() failed: %m");
goto child_fail;
}
- if (safe_mkdir(home, 0775, uid, gid) < 0) {
- log_error("safe_mkdir() failed: %m");
+ if (mkdir_safe_label(home, 0775, uid, gid) < 0) {
+ log_error("mkdir_safe_label() failed: %m");
goto child_fail;
}
~ianmdlvl / elogind.git / blobdiff