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e26807239b
As Zbigniew pointed out a new ConditionFirstBoot= appears like the nicer way to hook in systemd-firstboot.service on first boots (those with /etc unpopulated), so let's do this, and get rid of the generator again.
265 lines
7.8 KiB
C
265 lines
7.8 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/capability.h>
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#include <sys/statvfs.h>
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#include <fnmatch.h>
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#include "sd-id128.h"
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#include "util.h"
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#include "condition.h"
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#include "virt.h"
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#include "path-util.h"
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#include "fileio.h"
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#include "unit.h"
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#include "smack-util.h"
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#include "apparmor-util.h"
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#include "ima-util.h"
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#include "selinux-util.h"
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static bool condition_test_security(Condition *c) {
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assert(c);
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assert(c->parameter);
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assert(c->type == CONDITION_SECURITY);
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if (streq(c->parameter, "selinux"))
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return use_selinux() == !c->negate;
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if (streq(c->parameter, "apparmor"))
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return use_apparmor() == !c->negate;
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if (streq(c->parameter, "ima"))
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return use_ima() == !c->negate;
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if (streq(c->parameter, "smack"))
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return use_smack() == !c->negate;
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return c->negate;
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}
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static bool condition_test_capability(Condition *c) {
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_cleanup_fclose_ FILE *f = NULL;
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cap_value_t value;
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char line[LINE_MAX];
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unsigned long long capabilities = -1;
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assert(c);
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assert(c->parameter);
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assert(c->type == CONDITION_CAPABILITY);
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/* If it's an invalid capability, we don't have it */
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if (cap_from_name(c->parameter, &value) < 0)
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return c->negate;
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/* If it's a valid capability we default to assume
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* that we have it */
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f = fopen("/proc/self/status", "re");
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if (!f)
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return !c->negate;
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while (fgets(line, sizeof(line), f)) {
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truncate_nl(line);
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if (startswith(line, "CapBnd:")) {
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(void) sscanf(line+7, "%llx", &capabilities);
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break;
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}
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}
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return !!(capabilities & (1ULL << value)) == !c->negate;
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}
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static bool condition_test_needs_update(Condition *c) {
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const char *p;
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struct stat usr, other;
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assert(c);
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assert(c->parameter);
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assert(c->type == CONDITION_NEEDS_UPDATE);
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/* If the file system is read-only we shouldn't suggest an update */
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if (path_is_read_only_fs(c->parameter) > 0)
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return c->negate;
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/* Any other failure means we should allow the condition to be true,
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* so that we rather invoke too many update tools then too
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* few. */
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if (!path_is_absolute(c->parameter))
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return !c->negate;
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p = strappenda(c->parameter, "/.updated");
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if (lstat(p, &other) < 0)
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return !c->negate;
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if (lstat("/usr/", &usr) < 0)
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return !c->negate;
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return (usr.st_mtim.tv_sec > other.st_mtim.tv_sec ||
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(usr.st_mtim.tv_sec == other.st_mtim.tv_sec && usr.st_mtim.tv_nsec > other.st_mtim.tv_nsec)) == !c->negate;
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}
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static bool condition_test_first_boot(Condition *c) {
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int r;
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assert(c);
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assert(c->parameter);
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assert(c->type == CONDITION_FIRST_BOOT);
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r = parse_boolean(c->parameter);
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if (r < 0)
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return c->negate;
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return ((access("/run/systemd/first-boot", F_OK) >= 0) == !!r) == !c->negate;
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}
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static bool condition_test(Condition *c) {
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assert(c);
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switch(c->type) {
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case CONDITION_PATH_EXISTS:
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return (access(c->parameter, F_OK) >= 0) == !c->negate;
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case CONDITION_PATH_EXISTS_GLOB:
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return (glob_exists(c->parameter) > 0) == !c->negate;
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case CONDITION_PATH_IS_DIRECTORY: {
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struct stat st;
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if (stat(c->parameter, &st) < 0)
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return c->negate;
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return S_ISDIR(st.st_mode) == !c->negate;
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}
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case CONDITION_PATH_IS_SYMBOLIC_LINK: {
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struct stat st;
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if (lstat(c->parameter, &st) < 0)
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return c->negate;
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return S_ISLNK(st.st_mode) == !c->negate;
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}
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case CONDITION_PATH_IS_MOUNT_POINT:
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return (path_is_mount_point(c->parameter, true) > 0) == !c->negate;
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case CONDITION_PATH_IS_READ_WRITE:
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return (path_is_read_only_fs(c->parameter) > 0) == c->negate;
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case CONDITION_DIRECTORY_NOT_EMPTY: {
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int k;
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k = dir_is_empty(c->parameter);
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return !(k == -ENOENT || k > 0) == !c->negate;
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}
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case CONDITION_FILE_NOT_EMPTY: {
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struct stat st;
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if (stat(c->parameter, &st) < 0)
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return c->negate;
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return (S_ISREG(st.st_mode) && st.st_size > 0) == !c->negate;
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}
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case CONDITION_FILE_IS_EXECUTABLE: {
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struct stat st;
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if (stat(c->parameter, &st) < 0)
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return c->negate;
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return (S_ISREG(st.st_mode) && (st.st_mode & 0111)) == !c->negate;
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}
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case CONDITION_KERNEL_COMMAND_LINE:
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return condition_test_kernel_command_line(c);
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case CONDITION_VIRTUALIZATION:
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return condition_test_virtualization(c);
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case CONDITION_SECURITY:
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return condition_test_security(c);
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case CONDITION_CAPABILITY:
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return condition_test_capability(c);
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case CONDITION_HOST:
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return condition_test_host(c);
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case CONDITION_AC_POWER:
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return condition_test_ac_power(c);
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case CONDITION_ARCHITECTURE:
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return condition_test_architecture(c);
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case CONDITION_NEEDS_UPDATE:
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return condition_test_needs_update(c);
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case CONDITION_FIRST_BOOT:
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return condition_test_first_boot(c);
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case CONDITION_NULL:
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return !c->negate;
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default:
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assert_not_reached("Invalid condition type.");
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}
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}
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bool condition_test_list(const char *unit, Condition *first) {
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Condition *c;
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int triggered = -1;
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/* If the condition list is empty, then it is true */
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if (!first)
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return true;
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/* Otherwise, if all of the non-trigger conditions apply and
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* if any of the trigger conditions apply (unless there are
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* none) we return true */
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LIST_FOREACH(conditions, c, first) {
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bool b;
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b = condition_test(c);
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if (unit)
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log_debug_unit(unit,
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"%s=%s%s%s %s for %s.",
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condition_type_to_string(c->type),
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c->trigger ? "|" : "",
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c->negate ? "!" : "",
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c->parameter,
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b ? "succeeded" : "failed",
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unit);
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c->state = b ? 1 : -1;
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if (!c->trigger && !b)
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return false;
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if (c->trigger && triggered <= 0)
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triggered = b;
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}
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return triggered != 0;
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}
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