Adding upstream version 252.22.upstream/252.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 781 insertions, 0 deletions

diff --git a/src/shared/generator.c b/src/shared/generator.c
new file mode 100644
index 0000000..a406cbc
--- /dev/null
+++ b/src/shared/generator.c
@@ -0,0 +1,781 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "cgroup-util.h"
+#include "dropin.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fstab-util.h"
+#include "generator.h"
+#include "log.h"
+#include "macro.h"
+#include "mkdir-label.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "special.h"
+#include "specifier.h"
+#include "string-util.h"
+#include "time-util.h"
+#include "unit-name.h"
+#include "util.h"
+
+int generator_open_unit_file(
+                const char *dir,
+                const char *source,
+                const char *fn,
+                FILE **ret) {
+
+        _cleanup_free_ char *p = NULL;
+        FILE *f;
+        int r;
+
+        assert(dir);
+        assert(fn);
+        assert(ret);
+
+        p = path_join(dir, fn);
+        if (!p)
+                return log_oom();
+
+        r = fopen_unlocked(p, "wxe", &f);
+        if (r < 0) {
+                if (source && r == -EEXIST)
+                        return log_error_errno(r,
+                                               "Failed to create unit file '%s', as it already exists. Duplicate entry in '%s'?",
+                                               p, source);
+
+                return log_error_errno(r, "Failed to create unit file '%s': %m", p);
+        }
+
+        fprintf(f,
+                "# Automatically generated by %s\n\n",
+                program_invocation_short_name);
+
+        *ret = f;
+        return 0;
+}
+
+int generator_add_symlink(const char *dir, const char *dst, const char *dep_type, const char *src) {
+        /* Adds a symlink from <dst>.<dep_type>/ to <src> (if src is absolute)
+         * or ../<src> (otherwise). */
+
+        const char *from, *to;
+
+        from = path_is_absolute(src) ? src : strjoina("../", src);
+        to = strjoina(dir, "/", dst, ".", dep_type, "/", basename(src));
+
+        (void) mkdir_parents_label(to, 0755);
+        if (symlink(from, to) < 0)
+                if (errno != EEXIST)
+                        return log_error_errno(errno, "Failed to create symlink \"%s\": %m", to);
+
+        return 0;
+}
+
+static int write_fsck_sysroot_service(
+                const char *unit, /* Either SPECIAL_FSCK_ROOT_SERVICE or SPECIAL_FSCK_USR_SERVICE */
+                const char *dir,
+                const char *what,
+                const char *extra_after) {
+
+        _cleanup_free_ char *device = NULL, *escaped = NULL, *escaped2 = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        const char *fn;
+        int r;
+
+        /* Writes out special versions of systemd-root-fsck.service and systemd-usr-fsck.service for use in
+         * the initrd. The regular statically shipped versions of these unit files use / and /usr for as
+         * paths, which doesn't match what we need for the initrd (where the dirs are /sysroot +
+         * /sysusr/usr), hence we overwrite those versions here. */
+
+        escaped = specifier_escape(what);
+        if (!escaped)
+                return log_oom();
+
+        escaped2 = cescape(escaped);
+        if (!escaped2)
+                return log_oom();
+
+        fn = strjoina(dir, "/", unit);
+        log_debug("Creating %s", fn);
+
+        r = unit_name_from_path(what, ".device", &device);
+        if (r < 0)
+                return log_error_errno(r, "Failed to convert device \"%s\" to unit name: %m", what);
+
+        f = fopen(fn, "wxe");
+        if (!f)
+                return log_error_errno(errno, "Failed to create unit file %s: %m", fn);
+
+        fprintf(f,
+                "# Automatically generated by %1$s\n\n"
+                "[Unit]\n"
+                "Description=File System Check on %2$s\n"
+                "Documentation=man:%3$s(8)\n"
+                "DefaultDependencies=no\n"
+                "BindsTo=%4$s\n"
+                "Conflicts=shutdown.target\n"
+                "After=%5$s%6$slocal-fs-pre.target %4$s\n"
+                "Before=shutdown.target\n"
+                "\n"
+                "[Service]\n"
+                "Type=oneshot\n"
+                "RemainAfterExit=yes\n"
+                "ExecStart=" SYSTEMD_FSCK_PATH " %7$s\n"
+                "TimeoutSec=0\n",
+                program_invocation_short_name,
+                escaped,
+                unit,
+                device,
+                strempty(extra_after),
+                isempty(extra_after) ? "" : " ",
+                escaped2);
+
+        r = fflush_and_check(f);
+        if (r < 0)
+                return log_error_errno(r, "Failed to write unit file %s: %m", fn);
+
+        return 0;
+}
+
+int generator_write_fsck_deps(
+                FILE *f,
+                const char *dir,
+                const char *what,
+                const char *where,
+                const char *fstype) {
+
+        int r;
+
+        assert(f);
+        assert(dir);
+        assert(what);
+        assert(where);
+
+        /* Let's do an early exit if we are invoked for the root and /usr/ trees in the initrd, to avoid
+         * generating confusing log messages */
+        if (in_initrd() && PATH_IN_SET(where, "/", "/usr")) {
+                log_debug("Skipping fsck for %s in initrd.", where);
+                return 0;
+        }
+
+        if (!is_device_path(what)) {
+                log_warning("Checking was requested for \"%s\", but it is not a device.", what);
+                return 0;
+        }
+
+        if (!isempty(fstype) && !streq(fstype, "auto")) {
+                r = fsck_exists_for_fstype(fstype);
+                if (r < 0)
+                        log_warning_errno(r, "Checking was requested for %s, but couldn't detect if fsck.%s may be used, proceeding: %m", what, fstype);
+                else if (r == 0) {
+                        /* treat missing check as essentially OK */
+                        log_debug("Checking was requested for %s, but fsck.%s does not exist.", what, fstype);
+                        return 0;
+                }
+        } else {
+                r = fsck_exists();
+                if (r < 0)
+                        log_warning_errno(r, "Checking was requested for %s, but couldn't detect if the fsck command may be used, proceeding: %m", what);
+                else if (r == 0) {
+                        /* treat missing fsck as essentially OK */
+                        log_debug("Checking was requested for %s, but the fsck command does not exist.", what);
+                        return 0;
+                }
+        }
+
+        if (path_equal(where, "/")) {
+                const char *lnk;
+
+                /* We support running the fsck instance for the root fs while it is already mounted, for
+                 * compatibility with non-initrd boots. It's ugly, but it is how it is. Since – unlike for
+                 * regular file systems – this means the ordering is reversed (i.e. mount *before* fsck) we
+                 * have a separate fsck unit for this, independent of systemd-fsck@.service. */
+
+                lnk = strjoina(dir, "/" SPECIAL_LOCAL_FS_TARGET ".wants/" SPECIAL_FSCK_ROOT_SERVICE);
+
+                (void) mkdir_parents(lnk, 0755);
+                if (symlink(SYSTEM_DATA_UNIT_DIR "/" SPECIAL_FSCK_ROOT_SERVICE, lnk) < 0)
+                        return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+
+        } else {
+                _cleanup_free_ char *_fsck = NULL;
+                const char *fsck, *dep;
+
+                if (in_initrd() && path_equal(where, "/sysroot")) {
+                        r = write_fsck_sysroot_service(SPECIAL_FSCK_ROOT_SERVICE, dir, what, SPECIAL_INITRD_ROOT_DEVICE_TARGET);
+                        if (r < 0)
+                                return r;
+
+                        fsck = SPECIAL_FSCK_ROOT_SERVICE;
+                        dep = "Requires";
+
+                } else if (in_initrd() && path_equal(where, "/sysusr/usr")) {
+                        r = write_fsck_sysroot_service(SPECIAL_FSCK_USR_SERVICE, dir, what, NULL);
+                        if (r < 0)
+                                return r;
+
+                        fsck = SPECIAL_FSCK_USR_SERVICE;
+                        dep = "Requires";
+                } else {
+                        /* When this is /usr, then let's add a Wants= dependency, otherwise a Requires=
+                         * dependency. Why? We can't possibly unmount /usr during shutdown, but if we have a
+                         * Requires= from /usr onto a fsck@.service unit and that unit is shut down, then
+                         * we'd have to unmount /usr too.  */
+
+                        dep = path_equal(where, "/usr") ? "Wants" : "Requires";
+
+                        r = unit_name_from_path_instance("systemd-fsck", what, ".service", &_fsck);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to create fsck service name: %m");
+
+                        fsck = _fsck;
+                }
+
+                fprintf(f,
+                        "%1$s=%2$s\n"
+                        "After=%2$s\n",
+                        dep, fsck);
+        }
+
+        return 0;
+}
+
+int generator_write_timeouts(
+                const char *dir,
+                const char *what,
+                const char *where,
+                const char *opts,
+                char **filtered) {
+
+        /* Configure how long we wait for a device that backs a mount point or a
+         * swap partition to show up. This is useful to support endless device timeouts
+         * for devices that show up only after user input, like crypto devices. */
+
+        _cleanup_free_ char *node = NULL, *unit = NULL, *timeout = NULL;
+        usec_t u;
+        int r;
+
+        r = fstab_filter_options(opts, "comment=systemd.device-timeout\0"
+                                       "x-systemd.device-timeout\0",
+                                 NULL, &timeout, NULL, filtered);
+        if (r < 0) {
+                log_warning_errno(r, "Failed to parse fstab options, ignoring: %m");
+                return 0;
+        }
+        if (r == 0)
+                return 0;
+
+        r = parse_sec_fix_0(timeout, &u);
+        if (r < 0) {
+                log_warning("Failed to parse timeout for %s, ignoring: %s", where, timeout);
+                return 0;
+        }
+
+        node = fstab_node_to_udev_node(what);
+        if (!node)
+                return log_oom();
+        if (!is_device_path(node)) {
+                log_warning("x-systemd.device-timeout ignored for %s", what);
+                return 0;
+        }
+
+        r = unit_name_from_path(node, ".device", &unit);
+        if (r < 0)
+                return log_error_errno(r, "Failed to make unit name from path: %m");
+
+        return write_drop_in_format(dir, unit, 50, "device-timeout",
+                                    "# Automatically generated by %s\n"
+                                    "# from supplied options \"%s\"\n\n"
+                                    "[Unit]\n"
+                                    "JobRunningTimeoutSec=%s",
+                                    program_invocation_short_name,
+                                    opts,
+                                    timeout);
+}
+
+int generator_write_device_deps(
+                const char *dir,
+                const char *what,
+                const char *where,
+                const char *opts) {
+
+        /* fstab records that specify _netdev option should apply the network
+         * ordering on the actual device depending on network connection. If we
+         * are not mounting real device (NFS, CIFS), we rely on _netdev effect
+         * on the mount unit itself. */
+
+        _cleanup_free_ char *node = NULL, *unit = NULL;
+        int r;
+
+        if (fstab_is_extrinsic(where, opts))
+                return 0;
+
+        if (!fstab_test_option(opts, "_netdev\0"))
+                return 0;
+
+        node = fstab_node_to_udev_node(what);
+        if (!node)
+                return log_oom();
+
+        /* Nothing to apply dependencies to. */
+        if (!is_device_path(node))
+                return 0;
+
+        r = unit_name_from_path(node, ".device", &unit);
+        if (r < 0)
+                return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
+                                       node);
+
+        /* See mount_add_default_dependencies for explanation why we create such
+         * dependencies. */
+        return write_drop_in_format(dir, unit, 50, "netdev-dependencies",
+                                    "# Automatically generated by %s\n\n"
+                                    "[Unit]\n"
+                                    "After=" SPECIAL_NETWORK_ONLINE_TARGET " " SPECIAL_NETWORK_TARGET "\n"
+                                    "Wants=" SPECIAL_NETWORK_ONLINE_TARGET "\n",
+                                    program_invocation_short_name);
+}
+
+int generator_write_initrd_root_device_deps(const char *dir, const char *what) {
+        _cleanup_free_ char *unit = NULL;
+        int r;
+
+        r = unit_name_from_path(what, ".device", &unit);
+        if (r < 0)
+                return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
+                                       what);
+
+        return write_drop_in_format(dir, SPECIAL_INITRD_ROOT_DEVICE_TARGET, 50, "root-device",
+                                    "# Automatically generated by %s\n\n"
+                                    "[Unit]\n"
+                                    "Requires=%s\n"
+                                    "After=%s",
+                                    program_invocation_short_name,
+                                    unit,
+                                    unit);
+}
+
+int generator_hook_up_mkswap(
+                const char *dir,
+                const char *what) {
+
+        _cleanup_free_ char *node = NULL, *unit = NULL, *escaped = NULL, *where_unit = NULL;
+        _cleanup_free_ char *unit_file = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        int r;
+
+        node = fstab_node_to_udev_node(what);
+        if (!node)
+                return log_oom();
+
+        /* Nothing to work on. */
+        if (!is_device_path(node))
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "Cannot format something that is not a device node: %s",
+                                       node);
+
+        r = unit_name_from_path_instance("systemd-mkswap", node, ".service", &unit);
+        if (r < 0)
+                return log_error_errno(r, "Failed to make unit instance name from path \"%s\": %m",
+                                       node);
+
+        unit_file = path_join(dir, unit);
+        if (!unit_file)
+                return log_oom();
+
+        log_debug("Creating %s", unit_file);
+
+        escaped = cescape(node);
+        if (!escaped)
+                return log_oom();
+
+        r = unit_name_from_path(what, ".swap", &where_unit);
+        if (r < 0)
+                return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
+                                       what);
+
+        f = fopen(unit_file, "wxe");
+        if (!f)
+                return log_error_errno(errno, "Failed to create unit file %s: %m",
+                                       unit_file);
+
+        fprintf(f,
+                "# Automatically generated by %s\n\n"
+                "[Unit]\n"
+                "Description=Make Swap on %%f\n"
+                "Documentation=man:systemd-mkswap@.service(8)\n"
+                "DefaultDependencies=no\n"
+                "BindsTo=%%i.device\n"
+                "Conflicts=shutdown.target\n"
+                "After=%%i.device\n"
+                "Before=shutdown.target %s\n"
+                "\n"
+                "[Service]\n"
+                "Type=oneshot\n"
+                "RemainAfterExit=yes\n"
+                "ExecStart="SYSTEMD_MAKEFS_PATH " swap %s\n"
+                "TimeoutSec=0\n",
+                program_invocation_short_name,
+                where_unit,
+                escaped);
+
+        r = fflush_and_check(f);
+        if (r < 0)
+                return log_error_errno(r, "Failed to write unit file %s: %m", unit_file);
+
+        return generator_add_symlink(dir, where_unit, "requires", unit);
+}
+
+int generator_hook_up_mkfs(
+                const char *dir,
+                const char *what,
+                const char *where,
+                const char *type) {
+
+        _cleanup_free_ char *node = NULL, *unit = NULL, *unit_file = NULL, *escaped = NULL, *where_unit = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        int r;
+
+        node = fstab_node_to_udev_node(what);
+        if (!node)
+                return log_oom();
+
+        /* Nothing to work on. */
+        if (!is_device_path(node))
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "Cannot format something that is not a device node: %s",
+                                       node);
+
+        if (!type || streq(type, "auto"))
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "Cannot format partition %s, filesystem type is not specified",
+                                       node);
+
+        r = unit_name_from_path_instance("systemd-makefs", node, ".service", &unit);
+        if (r < 0)
+                return log_error_errno(r, "Failed to make unit instance name from path \"%s\": %m",
+                                       node);
+
+        unit_file = path_join(dir, unit);
+        if (!unit_file)
+                return log_oom();
+
+        log_debug("Creating %s", unit_file);
+
+        const char *fsck_unit;
+        if (in_initrd() && path_equal(where, "/sysroot"))
+                fsck_unit = SPECIAL_FSCK_ROOT_SERVICE;
+        else if (in_initrd() && path_equal(where, "/sysusr/usr"))
+                fsck_unit = SPECIAL_FSCK_USR_SERVICE;
+        else
+                fsck_unit = "systemd-fsck@%i.service";
+
+        escaped = cescape(node);
+        if (!escaped)
+                return log_oom();
+
+        r = unit_name_from_path(where, ".mount", &where_unit);
+        if (r < 0)
+                return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
+                                       where);
+
+        f = fopen(unit_file, "wxe");
+        if (!f)
+                return log_error_errno(errno, "Failed to create unit file %s: %m",
+                                       unit_file);
+
+        fprintf(f,
+                "# Automatically generated by %s\n\n"
+                "[Unit]\n"
+                "Description=Make File System on %%f\n"
+                "Documentation=man:systemd-makefs@.service(8)\n"
+                "DefaultDependencies=no\n"
+                "BindsTo=%%i.device\n"
+                "Conflicts=shutdown.target\n"
+                "After=%%i.device\n"
+                /* fsck might or might not be used, so let's be safe and order
+                 * ourselves before both systemd-fsck@.service and the mount unit. */
+                "Before=shutdown.target %s %s\n"
+                "\n"
+                "[Service]\n"
+                "Type=oneshot\n"
+                "RemainAfterExit=yes\n"
+                "ExecStart="SYSTEMD_MAKEFS_PATH " %s %s\n"
+                "TimeoutSec=0\n",
+                program_invocation_short_name,
+                fsck_unit,
+                where_unit,
+                type,
+                escaped);
+        // XXX: what about local-fs-pre.target?
+
+        r = fflush_and_check(f);
+        if (r < 0)
+                return log_error_errno(r, "Failed to write unit file %s: %m", unit_file);
+
+        return generator_add_symlink(dir, where_unit, "requires", unit);
+}
+
+int generator_hook_up_growfs(
+                const char *dir,
+                const char *where,
+                const char *target) {
+
+        _cleanup_free_ char *unit = NULL, *escaped = NULL, *where_unit = NULL, *unit_file = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        int r;
+
+        assert(dir);
+        assert(where);
+
+        escaped = cescape(where);
+        if (!escaped)
+                return log_oom();
+
+        r = unit_name_from_path_instance("systemd-growfs", where, ".service", &unit);
+        if (r < 0)
+                return log_error_errno(r, "Failed to make unit instance name from path \"%s\": %m",
+                                       where);
+
+        r = unit_name_from_path(where, ".mount", &where_unit);
+        if (r < 0)
+                return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
+                                       where);
+
+        unit_file = path_join(dir, unit);
+        if (!unit_file)
+                return log_oom();
+
+        log_debug("Creating %s", unit_file);
+
+        f = fopen(unit_file, "wxe");
+        if (!f)
+                return log_error_errno(errno, "Failed to create unit file %s: %m",
+                                       unit_file);
+
+        fprintf(f,
+                "# Automatically generated by %s\n\n"
+                "[Unit]\n"
+                "Description=Grow File System on %%f\n"
+                "Documentation=man:systemd-growfs@.service(8)\n"
+                "DefaultDependencies=no\n"
+                "BindsTo=%%i.mount\n"
+                "Conflicts=shutdown.target\n"
+                "After=systemd-repart.service %%i.mount\n"
+                "Before=shutdown.target%s%s\n",
+                program_invocation_short_name,
+                target ? " " : "",
+                strempty(target));
+
+        if (empty_or_root(where)) /* Make sure the root fs is actually writable before we resize it */
+                fprintf(f,
+                        "After=systemd-remount-fs.service\n");
+
+        fprintf(f,
+                "\n"
+                "[Service]\n"
+                "Type=oneshot\n"
+                "RemainAfterExit=yes\n"
+                "ExecStart="SYSTEMD_GROWFS_PATH " %s\n"
+                "TimeoutSec=0\n",
+                escaped);
+
+        return generator_add_symlink(dir, where_unit, "wants", unit);
+}
+
+int generator_enable_remount_fs_service(const char *dir) {
+        /* Pull in systemd-remount-fs.service */
+        return generator_add_symlink(dir, SPECIAL_LOCAL_FS_TARGET, "wants",
+                                     SYSTEM_DATA_UNIT_DIR "/" SPECIAL_REMOUNT_FS_SERVICE);
+}
+
+int generator_write_blockdev_dependency(
+                FILE *f,
+                const char *what) {
+
+        _cleanup_free_ char *escaped = NULL;
+        int r;
+
+        assert(f);
+        assert(what);
+
+        if (!path_startswith(what, "/dev/"))
+                return 0;
+
+        r = unit_name_path_escape(what, &escaped);
+        if (r < 0)
+                return log_error_errno(r, "Failed to escape device node path %s: %m", what);
+
+        fprintf(f,
+                "After=blockdev@%s.target\n",
+                escaped);
+
+        return 0;
+}
+
+int generator_write_cryptsetup_unit_section(
+                FILE *f,
+                const char *source) {
+
+        assert(f);
+
+        fprintf(f,
+                "[Unit]\n"
+                "Description=Cryptography Setup for %%I\n"
+                "Documentation=man:crypttab(5) man:systemd-cryptsetup-generator(8) man:systemd-cryptsetup@.service(8)\n");
+
+        if (source)
+                fprintf(f, "SourcePath=%s\n", source);
+
+        fprintf(f,
+                "DefaultDependencies=no\n"
+                "IgnoreOnIsolate=true\n"
+                "After=cryptsetup-pre.target systemd-udevd-kernel.socket\n"
+                "Before=blockdev@dev-mapper-%%i.target\n"
+                "Wants=blockdev@dev-mapper-%%i.target\n");
+
+        return 0;
+}
+
+int generator_write_cryptsetup_service_section(
+                FILE *f,
+                const char *name,
+                const char *what,
+                const char *key_file,
+                const char *options) {
+
+        _cleanup_free_ char *name_escaped = NULL, *what_escaped = NULL, *key_file_escaped = NULL, *options_escaped = NULL;
+
+        assert(f);
+        assert(name);
+        assert(what);
+
+        name_escaped = specifier_escape(name);
+        if (!name_escaped)
+                return log_oom();
+
+        what_escaped = specifier_escape(what);
+        if (!what_escaped)
+                return log_oom();
+
+        if (key_file) {
+                key_file_escaped = specifier_escape(key_file);
+                if (!key_file_escaped)
+                        return log_oom();
+        }
+
+        if (options) {
+                options_escaped = specifier_escape(options);
+                if (!options_escaped)
+                        return log_oom();
+        }
+
+        fprintf(f,
+                "\n"
+                "[Service]\n"
+                "Type=oneshot\n"
+                "RemainAfterExit=yes\n"
+                "TimeoutSec=0\n"          /* The binary handles timeouts on its own */
+                "KeyringMode=shared\n"    /* Make sure we can share cached keys among instances */
+                "OOMScoreAdjust=500\n"    /* Unlocking can allocate a lot of memory if Argon2 is used */
+                "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n"
+                "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n",
+                name_escaped, what_escaped, strempty(key_file_escaped), strempty(options_escaped),
+                name_escaped);
+
+        return 0;
+}
+
+int generator_write_veritysetup_unit_section(
+                FILE *f,
+                const char *source) {
+
+        assert(f);
+
+        fprintf(f,
+                "[Unit]\n"
+                "Description=Integrity Protection Setup for %%I\n"
+                "Documentation=man:veritytab(5) man:systemd-veritysetup-generator(8) man:systemd-veritysetup@.service(8)\n");
+
+        if (source)
+                fprintf(f, "SourcePath=%s\n", source);
+
+        fprintf(f,
+                "DefaultDependencies=no\n"
+                "IgnoreOnIsolate=true\n"
+                "After=veritysetup-pre.target systemd-udevd-kernel.socket\n"
+                "Before=blockdev@dev-mapper-%%i.target\n"
+                "Wants=blockdev@dev-mapper-%%i.target\n");
+
+        return 0;
+}
+
+int generator_write_veritysetup_service_section(
+                FILE *f,
+                const char *name,
+                const char *data_what,
+                const char *hash_what,
+                const char *roothash,
+                const char *options) {
+
+        _cleanup_free_ char *name_escaped = NULL, *data_what_escaped = NULL, *hash_what_escaped = NULL,
+                            *roothash_escaped = NULL, *options_escaped = NULL;
+
+        assert(f);
+        assert(name);
+        assert(data_what);
+        assert(hash_what);
+
+        name_escaped = specifier_escape(name);
+        if (!name_escaped)
+                return log_oom();
+
+        data_what_escaped = specifier_escape(data_what);
+        if (!data_what_escaped)
+                return log_oom();
+
+        hash_what_escaped = specifier_escape(hash_what);
+        if (!hash_what_escaped)
+                return log_oom();
+
+        roothash_escaped = specifier_escape(roothash);
+        if (!roothash_escaped)
+                return log_oom();
+
+        if (options) {
+                options_escaped = specifier_escape(options);
+                if (!options_escaped)
+                        return log_oom();
+        }
+
+        fprintf(f,
+                "\n"
+                "[Service]\n"
+                "Type=oneshot\n"
+                "RemainAfterExit=yes\n"
+                "ExecStart=" SYSTEMD_VERITYSETUP_PATH " attach '%s' '%s' '%s' '%s' '%s'\n"
+                "ExecStop=" SYSTEMD_VERITYSETUP_PATH " detach '%s'\n",
+                name_escaped, data_what_escaped, hash_what_escaped, roothash_escaped, strempty(options_escaped),
+                name_escaped);
+
+        return 0;
+}
+
+void log_setup_generator(void) {
+        if (invoked_by_systemd()) {
+                /* Disable talking to syslog/journal (i.e. the two IPC-based loggers) if we run in system context. */
+                if (cg_pid_get_owner_uid(0, NULL) == -ENXIO /* not running in a per-user slice */)
+                        log_set_prohibit_ipc(true);
+
+                /* This effectively means: journal for per-user generators, kmsg otherwise */
+                log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
+        }
+
+        log_parse_environment();
+        (void) log_open();
+}