Adding upstream version 255.4.upstream/255.4

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

1 files changed, 935 insertions, 0 deletions

diff --git a/src/sysv-generator/sysv-generator.c b/src/sysv-generator/sysv-generator.c
new file mode 100644
index 0000000..4485e2e
--- /dev/null
+++ b/src/sysv-generator/sysv-generator.c
@@ -0,0 +1,935 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "sd-messages.h"
+
+#include "alloc-util.h"
+#include "dirent-util.h"
+#include "exit-status.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "generator.h"
+#include "hashmap.h"
+#include "hexdecoct.h"
+#include "initrd-util.h"
+#include "install.h"
+#include "log.h"
+#include "main-func.h"
+#include "mkdir.h"
+#include "path-lookup.h"
+#include "path-util.h"
+#include "set.h"
+#include "special.h"
+#include "specifier.h"
+#include "stat-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "unit-name.h"
+
+/* 🚨 Note: this generator is deprecated! Please do not add new features! Instead, please port remaining SysV
+ * scripts over to native unit files! Thank you! 🚨 */
+
+static const struct {
+        const char *path;
+        const char *target;
+} rcnd_table[] = {
+        /* Standard SysV runlevels for start-up */
+        { "rc1.d",  SPECIAL_RESCUE_TARGET     },
+        { "rc2.d",  SPECIAL_MULTI_USER_TARGET },
+        { "rc3.d",  SPECIAL_MULTI_USER_TARGET },
+        { "rc4.d",  SPECIAL_MULTI_USER_TARGET },
+        { "rc5.d",  SPECIAL_GRAPHICAL_TARGET  },
+
+        /* We ignore the SysV runlevels for shutdown here, as SysV services get default dependencies anyway, and that
+         * means they are shut down anyway at system power off if running. */
+};
+
+static const char *arg_dest = NULL;
+
+typedef struct SysvStub {
+        char *name;
+        char *path;
+        char *description;
+        int sysv_start_priority;
+        char *pid_file;
+        char **before;
+        char **after;
+        char **wants;
+        char **wanted_by;
+        bool has_lsb;
+        bool reload;
+        bool loaded;
+} SysvStub;
+
+static SysvStub* free_sysvstub(SysvStub *s) {
+        if (!s)
+                return NULL;
+
+        free(s->name);
+        free(s->path);
+        free(s->description);
+        free(s->pid_file);
+        strv_free(s->before);
+        strv_free(s->after);
+        strv_free(s->wants);
+        strv_free(s->wanted_by);
+        return mfree(s);
+}
+DEFINE_TRIVIAL_CLEANUP_FUNC(SysvStub*, free_sysvstub);
+
+static void free_sysvstub_hashmapp(Hashmap **h) {
+        hashmap_free_with_destructor(*h, free_sysvstub);
+}
+
+static int add_alias(const char *service, const char *alias) {
+        _cleanup_free_ char *link = NULL;
+
+        assert(service);
+        assert(alias);
+
+        link = path_join(arg_dest, alias);
+        if (!link)
+                return -ENOMEM;
+
+        if (symlink(service, link) < 0) {
+                if (errno == EEXIST)
+                        return 0;
+
+                return -errno;
+        }
+
+        return 1;
+}
+
+static int generate_unit_file(SysvStub *s) {
+        _cleanup_free_ char *path_escaped = NULL, *unit = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        int r;
+
+        assert(s);
+
+        if (!s->loaded)
+                return 0;
+
+        path_escaped = specifier_escape(s->path);
+        if (!path_escaped)
+                return log_oom();
+
+        unit = path_join(arg_dest, s->name);
+        if (!unit)
+                return log_oom();
+
+        /* We might already have a symlink with the same name from a Provides:,
+         * or from backup files like /etc/init.d/foo.bak. Real scripts always win,
+         * so remove an existing link */
+        if (is_symlink(unit) > 0) {
+                log_warning("Overwriting existing symlink %s with real service.", unit);
+                (void) unlink(unit);
+        }
+
+        f = fopen(unit, "wxe");
+        if (!f)
+                return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
+
+        fprintf(f,
+                "# Automatically generated by systemd-sysv-generator\n\n"
+                "[Unit]\n"
+                "Documentation=man:systemd-sysv-generator(8)\n"
+                "SourcePath=%s\n",
+                path_escaped);
+
+        if (s->description) {
+                _cleanup_free_ char *t = NULL;
+
+                t = specifier_escape(s->description);
+                if (!t)
+                        return log_oom();
+
+                fprintf(f, "Description=%s\n", t);
+        }
+
+        STRV_FOREACH(p, s->before)
+                fprintf(f, "Before=%s\n", *p);
+        STRV_FOREACH(p, s->after)
+                fprintf(f, "After=%s\n", *p);
+        STRV_FOREACH(p, s->wants)
+                fprintf(f, "Wants=%s\n", *p);
+
+        fprintf(f,
+                "\n[Service]\n"
+                "Type=forking\n"
+                "Restart=no\n"
+                "TimeoutSec=5min\n"
+                "IgnoreSIGPIPE=no\n"
+                "KillMode=process\n"
+                "GuessMainPID=no\n"
+                "RemainAfterExit=%s\n",
+                yes_no(!s->pid_file));
+
+        if (s->pid_file) {
+                _cleanup_free_ char *t = NULL;
+
+                t = specifier_escape(s->pid_file);
+                if (!t)
+                        return log_oom();
+
+                fprintf(f, "PIDFile=%s\n", t);
+        }
+
+        /* Consider two special LSB exit codes a clean exit */
+        if (s->has_lsb)
+                fprintf(f,
+                        "SuccessExitStatus=%i %i\n",
+                        EXIT_NOTINSTALLED,
+                        EXIT_NOTCONFIGURED);
+
+        fprintf(f,
+                "ExecStart=%s start\n"
+                "ExecStop=%s stop\n",
+                path_escaped, path_escaped);
+
+        if (s->reload)
+                fprintf(f, "ExecReload=%s reload\n", path_escaped);
+
+        r = fflush_and_check(f);
+        if (r < 0)
+                return log_error_errno(r, "Failed to write unit %s: %m", unit);
+
+        STRV_FOREACH(p, s->wanted_by)
+                (void) generator_add_symlink(arg_dest, *p, "wants", s->name);
+
+        return 1;
+}
+
+static bool usage_contains_reload(const char *line) {
+        return (strcasestr(line, "{reload|") ||
+                strcasestr(line, "{reload}") ||
+                strcasestr(line, "{reload\"") ||
+                strcasestr(line, "|reload|") ||
+                strcasestr(line, "|reload}") ||
+                strcasestr(line, "|reload\""));
+}
+
+static char *sysv_translate_name(const char *name) {
+        _cleanup_free_ char *c = NULL;
+        char *res;
+
+        c = strdup(name);
+        if (!c)
+                return NULL;
+
+        res = endswith(c, ".sh");
+        if (res)
+                *res = 0;
+
+        if (unit_name_mangle(c, 0, &res) < 0)
+                return NULL;
+
+        return res;
+}
+
+static int sysv_translate_facility(SysvStub *s, unsigned line, const char *name, char **ret) {
+
+        /* We silently ignore the $ prefix here. According to the LSB
+         * spec it simply indicates whether something is a
+         * standardized name or a distribution-specific one. Since we
+         * just follow what already exists and do not introduce new
+         * uses or names we don't care who introduced a new name. */
+
+        static const char * const table[] = {
+                /* LSB defined facilities */
+                "local_fs",             NULL,
+                "network",              SPECIAL_NETWORK_ONLINE_TARGET,
+                "named",                SPECIAL_NSS_LOOKUP_TARGET,
+                "portmap",              SPECIAL_RPCBIND_TARGET,
+                "remote_fs",            SPECIAL_REMOTE_FS_TARGET,
+                "syslog",               NULL,
+                "time",                 SPECIAL_TIME_SYNC_TARGET,
+        };
+
+        _cleanup_free_ char *filename = NULL;
+        const char *n;
+        char *e, *m;
+        int r;
+
+        assert(name);
+        assert(s);
+        assert(ret);
+
+        r = path_extract_filename(s->path, &filename);
+        if (r < 0)
+                return log_error_errno(r, "Failed to extract file name from path '%s': %m", s->path);
+
+        n = *name == '$' ? name + 1 : name;
+
+        for (size_t i = 0; i < ELEMENTSOF(table); i += 2) {
+                if (!streq(table[i], n))
+                        continue;
+
+                if (!table[i+1]) {
+                        *ret = NULL;
+                        return 0;
+                }
+
+                m = strdup(table[i+1]);
+                if (!m)
+                        return log_oom();
+
+                *ret = m;
+                return 1;
+        }
+
+        /* If we don't know this name, fallback heuristics to figure
+         * out whether something is a target or a service alias. */
+
+        /* Facilities starting with $ are most likely targets */
+        if (*name == '$')  {
+                r = unit_name_build(n, NULL, ".target", ret);
+                if (r < 0)
+                        return log_error_errno(r, "[%s:%u] Could not build name for facility %s: %m", s->path, line, name);
+
+                return 1;
+        }
+
+        /* Strip ".sh" suffix from file name for comparison */
+        e = endswith(filename, ".sh");
+        if (e)
+                *e = '\0';
+
+        /* Names equaling the file name of the services are redundant */
+        if (streq_ptr(n, filename)) {
+                *ret = NULL;
+                return 0;
+        }
+
+        /* Everything else we assume to be normal service names */
+        m = sysv_translate_name(n);
+        if (!m)
+                return log_oom();
+
+        *ret = m;
+        return 1;
+}
+
+static int handle_provides(SysvStub *s, unsigned line, const char *full_text, const char *text) {
+        int r;
+
+        assert(s);
+        assert(full_text);
+        assert(text);
+
+        for (;;) {
+                _cleanup_free_ char *word = NULL, *m = NULL;
+
+                r = extract_first_word(&text, &word, NULL, EXTRACT_UNQUOTE|EXTRACT_RELAX);
+                if (r < 0)
+                        return log_error_errno(r, "[%s:%u] Failed to parse word from provides string: %m", s->path, line);
+                if (r == 0)
+                        break;
+
+                r = sysv_translate_facility(s, line, word, &m);
+                if (r <= 0) /* continue on error */
+                        continue;
+
+                switch (unit_name_to_type(m)) {
+
+                case UNIT_SERVICE:
+                        log_debug("Adding Provides: alias '%s' for '%s'", m, s->name);
+                        r = add_alias(s->name, m);
+                        if (r < 0)
+                                log_warning_errno(r, "[%s:%u] Failed to add LSB Provides name %s, ignoring: %m", s->path, line, m);
+                        break;
+
+                case UNIT_TARGET:
+
+                        /* NB: SysV targets which are provided by a
+                         * service are pulled in by the services, as
+                         * an indication that the generic service is
+                         * now available. This is strictly one-way.
+                         * The targets do NOT pull in SysV services! */
+
+                        r = strv_extend(&s->before, m);
+                        if (r < 0)
+                                return log_oom();
+
+                        r = strv_extend(&s->wants, m);
+                        if (r < 0)
+                                return log_oom();
+
+                        if (streq(m, SPECIAL_NETWORK_ONLINE_TARGET)) {
+                                r = strv_extend(&s->before, SPECIAL_NETWORK_TARGET);
+                                if (r < 0)
+                                        return log_oom();
+                                r = strv_extend(&s->wants, SPECIAL_NETWORK_TARGET);
+                                if (r < 0)
+                                        return log_oom();
+                        }
+
+                        break;
+
+                case _UNIT_TYPE_INVALID:
+                        log_warning("Unit name '%s' is invalid", m);
+                        break;
+
+                default:
+                        log_warning("Unknown unit type for unit '%s'", m);
+                }
+        }
+
+        return 0;
+}
+
+static int handle_dependencies(SysvStub *s, unsigned line, const char *full_text, const char *text) {
+        int r;
+
+        assert(s);
+        assert(full_text);
+        assert(text);
+
+        for (;;) {
+                _cleanup_free_ char *word = NULL, *m = NULL;
+                bool is_before;
+
+                r = extract_first_word(&text, &word, NULL, EXTRACT_UNQUOTE|EXTRACT_RELAX);
+                if (r < 0)
+                        return log_error_errno(r, "[%s:%u] Failed to parse word from provides string: %m", s->path, line);
+                if (r == 0)
+                        break;
+
+                r = sysv_translate_facility(s, line, word, &m);
+                if (r <= 0) /* continue on error */
+                        continue;
+
+                is_before = startswith_no_case(full_text, "X-Start-Before:");
+
+                if (streq(m, SPECIAL_NETWORK_ONLINE_TARGET) && !is_before) {
+                        /* the network-online target is special, as it needs to be actively pulled in */
+                        r = strv_extend(&s->after, m);
+                        if (r < 0)
+                                return log_oom();
+
+                        r = strv_extend(&s->wants, m);
+                } else
+                        r = strv_extend(is_before ? &s->before : &s->after, m);
+                if (r < 0)
+                        return log_oom();
+        }
+
+        return 0;
+}
+
+static int load_sysv(SysvStub *s) {
+        _cleanup_fclose_ FILE *f = NULL;
+        unsigned line = 0;
+        int r;
+        enum {
+                NORMAL,
+                DESCRIPTION,
+                LSB,
+                LSB_DESCRIPTION,
+                USAGE_CONTINUATION
+        } state = NORMAL;
+        _cleanup_free_ char *short_description = NULL, *long_description = NULL, *chkconfig_description = NULL;
+        char *description;
+        bool supports_reload = false;
+
+        assert(s);
+
+        f = fopen(s->path, "re");
+        if (!f) {
+                if (errno == ENOENT)
+                        return 0;
+
+                return log_error_errno(errno, "Failed to open %s: %m", s->path);
+        }
+
+        log_debug("Loading SysV script %s", s->path);
+
+        for (;;) {
+                _cleanup_free_ char *l = NULL;
+
+                r = read_stripped_line(f, LONG_LINE_MAX, &l);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to read configuration file '%s': %m", s->path);
+                if (r == 0)
+                        break;
+
+                line++;
+
+                if (l[0] != '#') {
+                        /* Try to figure out whether this init script supports
+                         * the reload operation. This heuristic looks for
+                         * "Usage" lines which include the reload option. */
+                        if (state == USAGE_CONTINUATION ||
+                            (state == NORMAL && strcasestr(l, "usage"))) {
+                                if (usage_contains_reload(l)) {
+                                        supports_reload = true;
+                                        state = NORMAL;
+                                } else if (endswith(l, "\\"))
+                                        state = USAGE_CONTINUATION;
+                                else
+                                        state = NORMAL;
+                        }
+
+                        continue;
+                }
+
+                if (state == NORMAL && streq(l, "### BEGIN INIT INFO")) {
+                        state = LSB;
+                        s->has_lsb = true;
+                        continue;
+                }
+
+                if (IN_SET(state, LSB_DESCRIPTION, LSB) && streq(l, "### END INIT INFO")) {
+                        state = NORMAL;
+                        continue;
+                }
+
+                char *t = l + 1;
+                t += strspn(t, WHITESPACE);
+
+                if (state == NORMAL) {
+
+                        /* Try to parse Red Hat style description */
+
+                        if (startswith_no_case(t, "description:")) {
+
+                                size_t k;
+                                const char *j;
+
+                                k = strlen(t);
+                                if (k > 0 && t[k-1] == '\\') {
+                                        state = DESCRIPTION;
+                                        t[k-1] = 0;
+                                }
+
+                                j = empty_to_null(strstrip(t+12));
+
+                                r = free_and_strdup(&chkconfig_description, j);
+                                if (r < 0)
+                                        return log_oom();
+
+                        } else if (startswith_no_case(t, "pidfile:")) {
+                                const char *fn;
+
+                                state = NORMAL;
+
+                                fn = strstrip(t+8);
+                                if (!path_is_absolute(fn)) {
+                                        log_error("[%s:%u] PID file not absolute. Ignoring.", s->path, line);
+                                        continue;
+                                }
+
+                                r = free_and_strdup(&s->pid_file, fn);
+                                if (r < 0)
+                                        return log_oom();
+                        }
+
+                } else if (state == DESCRIPTION) {
+
+                        /* Try to parse Red Hat style description
+                         * continuation */
+
+                        size_t k;
+                        const char *j;
+
+                        k = strlen(t);
+                        if (k > 0 && t[k-1] == '\\')
+                                t[k-1] = 0;
+                        else
+                                state = NORMAL;
+
+                        j = strstrip(t);
+                        if (!isempty(j) && !strextend_with_separator(&chkconfig_description, " ", j))
+                                return log_oom();
+
+                } else if (IN_SET(state, LSB, LSB_DESCRIPTION)) {
+
+                        if (startswith_no_case(t, "Provides:")) {
+                                state = LSB;
+
+                                r = handle_provides(s, line, t, t + 9);
+                                if (r < 0)
+                                        return r;
+
+                        } else if (startswith_no_case(t, "Required-Start:") ||
+                                   startswith_no_case(t, "Should-Start:") ||
+                                   startswith_no_case(t, "X-Start-Before:") ||
+                                   startswith_no_case(t, "X-Start-After:")) {
+
+                                state = LSB;
+
+                                r = handle_dependencies(s, line, t, strchr(t, ':') + 1);
+                                if (r < 0)
+                                        return r;
+
+                        } else if (startswith_no_case(t, "Description:")) {
+                                const char *j;
+
+                                state = LSB_DESCRIPTION;
+
+                                j = empty_to_null(strstrip(t+12));
+
+                                r = free_and_strdup(&long_description, j);
+                                if (r < 0)
+                                        return log_oom();
+
+                        } else if (startswith_no_case(t, "Short-Description:")) {
+                                const char *j;
+
+                                state = LSB;
+
+                                j = empty_to_null(strstrip(t+18));
+
+                                r = free_and_strdup(&short_description, j);
+                                if (r < 0)
+                                        return log_oom();
+
+                        } else if (state == LSB_DESCRIPTION) {
+
+                                if (startswith(l, "#\t") || startswith(l, "#  ")) {
+                                        const char *j;
+
+                                        j = strstrip(t);
+                                        if (!isempty(j) && !strextend_with_separator(&long_description, " ", j))
+                                                return log_oom();
+                                } else
+                                        state = LSB;
+                        }
+                }
+        }
+
+        s->reload = supports_reload;
+
+        /* We use the long description only if
+         * no short description is set. */
+
+        if (short_description)
+                description = short_description;
+        else if (chkconfig_description)
+                description = chkconfig_description;
+        else if (long_description)
+                description = long_description;
+        else
+                description = NULL;
+
+        if (description) {
+                char *d;
+
+                d = strjoin(s->has_lsb ? "LSB: " : "SYSV: ", description);
+                if (!d)
+                        return log_oom();
+
+                s->description = d;
+        }
+
+        s->loaded = true;
+        return 0;
+}
+
+static int fix_order(SysvStub *s, Hashmap *all_services) {
+        SysvStub *other;
+        int r;
+
+        assert(s);
+
+        if (!s->loaded)
+                return 0;
+
+        if (s->sysv_start_priority < 0)
+                return 0;
+
+        HASHMAP_FOREACH(other, all_services) {
+                if (s == other)
+                        continue;
+
+                if (!other->loaded)
+                        continue;
+
+                if (other->sysv_start_priority < 0)
+                        continue;
+
+                /* If both units have modern headers we don't care
+                 * about the priorities */
+                if (s->has_lsb && other->has_lsb)
+                        continue;
+
+                if (other->sysv_start_priority < s->sysv_start_priority) {
+                        r = strv_extend(&s->after, other->name);
+                        if (r < 0)
+                                return log_oom();
+
+                } else if (other->sysv_start_priority > s->sysv_start_priority) {
+                        r = strv_extend(&s->before, other->name);
+                        if (r < 0)
+                                return log_oom();
+                } else
+                        continue;
+
+                /* FIXME: Maybe we should compare the name here lexicographically? */
+        }
+
+        return 0;
+}
+
+static int acquire_search_path(const char *def, const char *envvar, char ***ret) {
+        _cleanup_strv_free_ char **l = NULL;
+        const char *e;
+        int r;
+
+        assert(def);
+        assert(envvar);
+
+        e = getenv(envvar);
+        if (e) {
+                r = path_split_and_make_absolute(e, &l);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to make $%s search path absolute: %m", envvar);
+        }
+
+        if (strv_isempty(l)) {
+                strv_free(l);
+
+                l = strv_new(def);
+                if (!l)
+                        return log_oom();
+        }
+
+        if (!path_strv_resolve_uniq(l, NULL))
+                return log_oom();
+
+        *ret = TAKE_PTR(l);
+
+        return 0;
+}
+
+static int enumerate_sysv(const LookupPaths *lp, Hashmap *all_services) {
+        _cleanup_strv_free_ char **sysvinit_path = NULL;
+        int r;
+
+        assert(lp);
+
+        r = acquire_search_path(SYSTEM_SYSVINIT_PATH, "SYSTEMD_SYSVINIT_PATH", &sysvinit_path);
+        if (r < 0)
+                return r;
+
+        STRV_FOREACH(path, sysvinit_path) {
+                _cleanup_closedir_ DIR *d = NULL;
+
+                d = opendir(*path);
+                if (!d) {
+                        if (errno != ENOENT)
+                                log_warning_errno(errno, "Opening %s failed, ignoring: %m", *path);
+                        continue;
+                }
+
+                FOREACH_DIRENT(de, d, log_error_errno(errno, "Failed to enumerate directory %s, ignoring: %m", *path)) {
+                        _cleanup_free_ char *fpath = NULL, *name = NULL;
+                        _cleanup_(free_sysvstubp) SysvStub *service = NULL;
+                        struct stat st;
+
+                        if (fstatat(dirfd(d), de->d_name, &st, 0) < 0) {
+                                log_warning_errno(errno, "stat() failed on %s/%s, ignoring: %m", *path, de->d_name);
+                                continue;
+                        }
+
+                        if (!(st.st_mode & S_IXUSR))
+                                continue;
+
+                        if (!S_ISREG(st.st_mode))
+                                continue;
+
+                        name = sysv_translate_name(de->d_name);
+                        if (!name)
+                                return log_oom();
+
+                        if (hashmap_contains(all_services, name))
+                                continue;
+
+                        r = unit_file_exists(RUNTIME_SCOPE_SYSTEM, lp, name);
+                        if (r < 0 && !IN_SET(r, -ELOOP, -ERFKILL, -EADDRNOTAVAIL)) {
+                                log_debug_errno(r, "Failed to detect whether %s exists, skipping: %m", name);
+                                continue;
+                        } else if (r != 0) {
+                                log_debug("Native unit for %s already exists, skipping.", name);
+                                continue;
+                        }
+
+                        fpath = path_join(*path, de->d_name);
+                        if (!fpath)
+                                return log_oom();
+
+                        log_struct(LOG_WARNING,
+                                   LOG_MESSAGE("SysV service '%s' lacks a native systemd unit file. "
+                                               "%s Automatically generating a unit file for compatibility. Please update package to include a native systemd unit file, in order to make it safe, robust and future-proof. "
+                                               "%s This compatibility logic is deprecated, expect removal soon. %s",
+                                               fpath,
+                                               special_glyph(SPECIAL_GLYPH_RECYCLING),
+                                               special_glyph(SPECIAL_GLYPH_WARNING_SIGN), special_glyph(SPECIAL_GLYPH_WARNING_SIGN)),
+                                   "MESSAGE_ID=" SD_MESSAGE_SYSV_GENERATOR_DEPRECATED_STR,
+                                   "SYSVSCRIPT=%s", fpath,
+                                   "UNIT=%s", name);
+
+                        service = new(SysvStub, 1);
+                        if (!service)
+                                return log_oom();
+
+                        *service = (SysvStub) {
+                                .sysv_start_priority = -1,
+                                .name = TAKE_PTR(name),
+                                .path = TAKE_PTR(fpath),
+                        };
+
+                        r = hashmap_put(all_services, service->name, service);
+                        if (r < 0)
+                                return log_oom();
+
+                        TAKE_PTR(service);
+                }
+        }
+
+        return 0;
+}
+
+static int set_dependencies_from_rcnd(const LookupPaths *lp, Hashmap *all_services) {
+        Set *runlevel_services[ELEMENTSOF(rcnd_table)] = {};
+        _cleanup_strv_free_ char **sysvrcnd_path = NULL;
+        SysvStub *service;
+        int r;
+
+        assert(lp);
+
+        r = acquire_search_path(SYSTEM_SYSVRCND_PATH, "SYSTEMD_SYSVRCND_PATH", &sysvrcnd_path);
+        if (r < 0)
+                return r;
+
+        STRV_FOREACH(p, sysvrcnd_path)
+                for (unsigned i = 0; i < ELEMENTSOF(rcnd_table); i ++) {
+                        _cleanup_closedir_ DIR *d = NULL;
+                        _cleanup_free_ char *path = NULL;
+
+                        path = path_join(*p, rcnd_table[i].path);
+                        if (!path) {
+                                r = log_oom();
+                                goto finish;
+                        }
+
+                        d = opendir(path);
+                        if (!d) {
+                                if (errno != ENOENT)
+                                        log_warning_errno(errno, "Opening %s failed, ignoring: %m", path);
+
+                                continue;
+                        }
+
+                        FOREACH_DIRENT(de, d, log_warning_errno(errno, "Failed to enumerate directory %s, ignoring: %m", path)) {
+                                _cleanup_free_ char *name = NULL, *fpath = NULL;
+                                int a, b;
+
+                                if (de->d_name[0] != 'S')
+                                        continue;
+
+                                if (strlen(de->d_name) < 4)
+                                        continue;
+
+                                a = undecchar(de->d_name[1]);
+                                b = undecchar(de->d_name[2]);
+
+                                if (a < 0 || b < 0)
+                                        continue;
+
+                                fpath = path_join(*p, de->d_name);
+                                if (!fpath) {
+                                        r = log_oom();
+                                        goto finish;
+                                }
+
+                                name = sysv_translate_name(de->d_name + 3);
+                                if (!name) {
+                                        r = log_oom();
+                                        goto finish;
+                                }
+
+                                service = hashmap_get(all_services, name);
+                                if (!service) {
+                                        log_debug("Ignoring %s symlink in %s, not generating %s.", de->d_name, rcnd_table[i].path, name);
+                                        continue;
+                                }
+
+                                service->sysv_start_priority = MAX(a*10 + b, service->sysv_start_priority);
+
+                                r = set_ensure_put(&runlevel_services[i], NULL, service);
+                                if (r < 0) {
+                                        log_oom();
+                                        goto finish;
+                                }
+                        }
+                }
+
+        for (unsigned i = 0; i < ELEMENTSOF(rcnd_table); i++)
+                SET_FOREACH(service, runlevel_services[i]) {
+                        r = strv_extend(&service->before, rcnd_table[i].target);
+                        if (r < 0) {
+                                log_oom();
+                                goto finish;
+                        }
+                        r = strv_extend(&service->wanted_by, rcnd_table[i].target);
+                        if (r < 0) {
+                                log_oom();
+                                goto finish;
+                        }
+                }
+
+        r = 0;
+
+finish:
+        for (unsigned i = 0; i < ELEMENTSOF(rcnd_table); i++)
+                set_free(runlevel_services[i]);
+
+        return r;
+}
+
+static int run(const char *dest, const char *dest_early, const char *dest_late) {
+        _cleanup_(free_sysvstub_hashmapp) Hashmap *all_services = NULL;
+        _cleanup_(lookup_paths_free) LookupPaths lp = {};
+        SysvStub *service;
+        int r;
+
+        if (in_initrd()) {
+                log_debug("Skipping generator, running in the initrd.");
+                return EXIT_SUCCESS;
+        }
+
+        assert_se(arg_dest = dest_late);
+
+        r = lookup_paths_init_or_warn(&lp, RUNTIME_SCOPE_SYSTEM, LOOKUP_PATHS_EXCLUDE_GENERATED, NULL);
+        if (r < 0)
+                return r;
+
+        all_services = hashmap_new(&string_hash_ops);
+        if (!all_services)
+                return log_oom();
+
+        r = enumerate_sysv(&lp, all_services);
+        if (r < 0)
+                return r;
+
+        r = set_dependencies_from_rcnd(&lp, all_services);
+        if (r < 0)
+                return r;
+
+        HASHMAP_FOREACH(service, all_services)
+                (void) load_sysv(service);
+
+        HASHMAP_FOREACH(service, all_services) {
+                (void) fix_order(service, all_services);
+                (void) generate_unit_file(service);
+        }
+
+        return 0;
+}
+
+DEFINE_MAIN_GENERATOR_FUNCTION(run);