Adding upstream version 252.22.upstream/252.22upstream

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

8 files changed, 1026 insertions, 0 deletions

diff --git a/src/xdg-autostart-generator/fuzz-xdg-desktop.c b/src/xdg-autostart-generator/fuzz-xdg-desktop.c
new file mode 100644
index 0000000..084c907
--- /dev/null
+++ b/src/xdg-autostart-generator/fuzz-xdg-desktop.c
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "fs-util.h"
+#include "fuzz.h"
+#include "rm-rf.h"
+#include "string-util.h"
+#include "strv.h"
+#include "tests.h"
+#include "tmpfile-util.h"
+#include "xdg-autostart-service.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+        _cleanup_(unlink_tempfilep) char name[] = "/tmp/fuzz-xdg-desktop.XXXXXX";
+        _cleanup_close_ int fd = -1;
+        _cleanup_(xdg_autostart_service_freep) XdgAutostartService *service = NULL;
+        _cleanup_(rm_rf_physical_and_freep) char *tmpdir = NULL;
+
+        if (outside_size_range(size, 0, 65536))
+                return 0;
+
+        /* We don't want to fill the logs with messages about parse errors.
+         * Disable most logging if not running standalone */
+        if (!getenv("SYSTEMD_LOG_LEVEL"))
+                log_set_max_level(LOG_CRIT);
+
+        assert_se(mkdtemp_malloc("/tmp/fuzz-xdg-desktop-XXXXXX", &tmpdir) >= 0);
+
+        fd = mkostemp_safe(name);
+        assert_se(fd >= 0);
+        assert_se(write(fd, data, size) == (ssize_t) size);
+
+        assert_se(service = xdg_autostart_service_parse_desktop(name));
+        assert_se(service->name = strdup("fuzz-xdg-desktop.service"));
+        (void) xdg_autostart_service_generate_unit(service, tmpdir);
+
+        return 0;
+}
diff --git a/src/xdg-autostart-generator/fuzz-xdg-desktop.options b/src/xdg-autostart-generator/fuzz-xdg-desktop.options
new file mode 100644
index 0000000..678d526
--- /dev/null
+++ b/src/xdg-autostart-generator/fuzz-xdg-desktop.options
@@ -0,0 +1,2 @@
+[libfuzzer]
+max_len = 65536
diff --git a/src/xdg-autostart-generator/meson.build b/src/xdg-autostart-generator/meson.build
new file mode 100644
index 0000000..cdce66b
--- /dev/null
+++ b/src/xdg-autostart-generator/meson.build
@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+systemd_xdg_autostart_generator_sources = files(
+        'xdg-autostart-generator.c',
+        'xdg-autostart-service.c',
+        'xdg-autostart-service.h')
+
+tests += [
+        [files('test-xdg-autostart.c',
+               'xdg-autostart-service.c',
+               'xdg-autostart-service.h')],
+]
+
+fuzzers += [
+        [files('fuzz-xdg-desktop.c',
+               'xdg-autostart-service.c',
+               'xdg-autostart-service.h')],
+]
diff --git a/src/xdg-autostart-generator/test-xdg-autostart.c b/src/xdg-autostart-generator/test-xdg-autostart.c
new file mode 100644
index 0000000..81f85d6
--- /dev/null
+++ b/src/xdg-autostart-generator/test-xdg-autostart.c
@@ -0,0 +1,104 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "fs-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "tests.h"
+#include "tmpfile-util.h"
+#include "xdg-autostart-service.h"
+
+TEST(translate_name) {
+        _cleanup_free_ char *t = NULL;
+
+        assert_se(t = xdg_autostart_service_translate_name("a-b.blub.desktop"));
+        assert_se(streq(t, "app-a\\x2db.blub@autostart.service"));
+}
+
+static void test_xdg_format_exec_start_one(const char *exec, const char *expected) {
+        _cleanup_free_ char* out = NULL;
+
+        xdg_autostart_format_exec_start(exec, &out);
+        log_info("In: '%s', out: '%s', expected: '%s'", exec, out, expected);
+        assert_se(streq(out, expected));
+}
+
+TEST(xdg_format_exec_start) {
+        _cleanup_free_ char *home = NULL;
+        _cleanup_free_ char *expected1 = NULL, *expected2 = NULL;
+
+        assert_se(get_home_dir(&home) >= 0);
+
+        test_xdg_format_exec_start_one("/bin/sleep 100", "/bin/sleep 100");
+
+        /* All standardised % identifiers are stripped. */
+        test_xdg_format_exec_start_one("/bin/sleep %f \"%F\" %u %U %d %D\t%n %N %i %c %k %v %m", "/bin/sleep");
+
+        /* Unknown % identifier currently remain, but are escaped. */
+        test_xdg_format_exec_start_one("/bin/sleep %X \"%Y\"", "/bin/sleep %%X %%Y");
+
+        test_xdg_format_exec_start_one("/bin/sleep \";\\\"\"", "/bin/sleep \";\\\"\"");
+
+        /* tilde is expanded only if standalone or at the start of a path */
+        expected1 = strjoin("/bin/ls ", home);
+        test_xdg_format_exec_start_one("/bin/ls ~", expected1);
+        expected2 = strjoin("/bin/ls ", home, "/foo");
+        test_xdg_format_exec_start_one("/bin/ls \"~/foo\"", expected2);
+        test_xdg_format_exec_start_one("/bin/ls ~foo", "/bin/ls ~foo");
+        test_xdg_format_exec_start_one("/bin/ls foo~", "/bin/ls foo~");
+}
+
+static const char* const xdg_desktop_file[] = {
+        ("[Desktop Entry]\n"
+         "Exec\t =\t /bin/sleep 100\n" /* Whitespace Before/After = must be ignored */
+         "OnlyShowIn = A;B;\n"
+         "NotShowIn=C;;D\\\\\\;;E\n"), /* "C", "", "D\;", "E" */
+
+        ("[Desktop Entry]\n"
+         "Exec=a\n"
+         "Exec=b\n"),
+
+        ("[Desktop Entry]\n"
+         "Hidden=\t true\n"),
+        ("[Desktop Entry]\n"
+         "Hidden=\t True\n"),
+};
+
+static void test_xdg_desktop_parse_one(unsigned i, const char *s) {
+        _cleanup_(unlink_tempfilep) char name[] = "/tmp/test-xdg-autostart-parser.XXXXXX";
+        _cleanup_fclose_ FILE *f = NULL;
+        _cleanup_(xdg_autostart_service_freep) XdgAutostartService *service = NULL;
+
+        log_info("== %s[%u] ==", __func__, i);
+
+        assert_se(fmkostemp_safe(name, "r+", &f) == 0);
+        assert_se(fwrite(s, strlen(s), 1, f) == 1);
+        rewind(f);
+
+        assert_se(service = xdg_autostart_service_parse_desktop(name));
+
+        switch (i) {
+        case 0:
+                assert_se(streq(service->exec_string, "/bin/sleep 100"));
+                assert_se(strv_equal(service->only_show_in, STRV_MAKE("A", "B")));
+                assert_se(strv_equal(service->not_show_in, STRV_MAKE("C", "D\\;", "E")));
+                assert_se(!service->hidden);
+                break;
+        case 1:
+                /* The second entry is not permissible and will be ignored (and error logged). */
+                assert_se(streq(service->exec_string, "a"));
+                break;
+        case 2:
+        case 3:
+                assert_se(service->hidden);
+                break;
+        }
+}
+
+TEST(xdg_desktop_parse) {
+        for (size_t i = 0; i < ELEMENTSOF(xdg_desktop_file); i++)
+                test_xdg_desktop_parse_one(i, xdg_desktop_file[i]);
+}
+
+DEFINE_TEST_MAIN(LOG_DEBUG);
diff --git a/src/xdg-autostart-generator/xdg-autostart-condition.c b/src/xdg-autostart-generator/xdg-autostart-condition.c
new file mode 100644
index 0000000..9ceea61
--- /dev/null
+++ b/src/xdg-autostart-generator/xdg-autostart-condition.c
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "main-func.h"
+#include "strv.h"
+
+/*
+ * This binary is intended to be run as an ExecCondition= in units generated
+ * by the xdg-autostart-generator. It does the appropriate checks against
+ * XDG_CURRENT_DESKTOP that are too advanced for simple ConditionEnvironment=
+ * matches.
+ */
+
+static int run(int argc, char *argv[]) {
+        _cleanup_strv_free_ char **only_show_in = NULL, **not_show_in = NULL, **desktops = NULL;
+        const char *xdg_current_desktop;
+
+        if (argc != 3)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "Wrong argument count. Expected the OnlyShowIn= and NotShowIn= sets, each colon separated.");
+
+        xdg_current_desktop = getenv("XDG_CURRENT_DESKTOP");
+        if (xdg_current_desktop) {
+                desktops = strv_split(xdg_current_desktop, ":");
+                if (!desktops)
+                        return log_oom();
+        }
+
+        only_show_in = strv_split(argv[1], ":");
+        not_show_in = strv_split(argv[2], ":");
+        if (!only_show_in || !not_show_in)
+                return log_oom();
+
+        /* Each desktop in XDG_CURRENT_DESKTOP needs to be matched in order. */
+        STRV_FOREACH(d, desktops) {
+                if (strv_contains(only_show_in, *d))
+                        return 0;
+                if (strv_contains(not_show_in, *d))
+                        return 1;
+        }
+
+        /* non-zero exit code when only_show_in has a proper value */
+        return !strv_isempty(only_show_in);
+}
+
+DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
diff --git a/src/xdg-autostart-generator/xdg-autostart-generator.c b/src/xdg-autostart-generator/xdg-autostart-generator.c
new file mode 100644
index 0000000..918f659
--- /dev/null
+++ b/src/xdg-autostart-generator/xdg-autostart-generator.c
@@ -0,0 +1,118 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "dirent-util.h"
+#include "fd-util.h"
+#include "generator.h"
+#include "glyph-util.h"
+#include "hashmap.h"
+#include "log.h"
+#include "main-func.h"
+#include "nulstr-util.h"
+#include "path-lookup.h"
+#include "stat-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "xdg-autostart-service.h"
+
+DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(xdgautostartservice_hash_ops, char, string_hash_func, string_compare_func, XdgAutostartService, xdg_autostart_service_free);
+
+static int enumerate_xdg_autostart(Hashmap *all_services) {
+        _cleanup_strv_free_ char **autostart_dirs = NULL;
+        _cleanup_strv_free_ char **config_dirs = NULL;
+        _unused_ _cleanup_strv_free_ char **data_dirs = NULL;
+        _cleanup_free_ char *user_config_autostart_dir = NULL;
+        int r;
+
+        r = xdg_user_config_dir(&user_config_autostart_dir, "/autostart");
+        if (r < 0)
+                return r;
+        r = strv_extend(&autostart_dirs, user_config_autostart_dir);
+        if (r < 0)
+                return r;
+
+        r = xdg_user_dirs(&config_dirs, &data_dirs);
+        if (r < 0)
+                return r;
+        r = strv_extend_strv_concat(&autostart_dirs, config_dirs, "/autostart");
+        if (r < 0)
+                return r;
+
+        STRV_FOREACH(path, autostart_dirs) {
+                _cleanup_closedir_ DIR *d = NULL;
+
+                log_debug("Scanning autostart directory \"%s\"%s", *path, special_glyph(SPECIAL_GLYPH_ELLIPSIS));
+                d = opendir(*path);
+                if (!d) {
+                        log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
+                                       "Opening %s failed, ignoring: %m", *path);
+                        continue;
+                }
+
+                FOREACH_DIRENT(de, d, log_warning_errno(errno, "Failed to enumerate directory %s, ignoring: %m", *path)) {
+                        struct stat st;
+                        if (fstatat(dirfd(d), de->d_name, &st, 0) < 0) {
+                                log_warning_errno(errno, "%s/%s: stat() failed, ignoring: %m", *path, de->d_name);
+                                continue;
+                        }
+
+                        if (!S_ISREG(st.st_mode)) {
+                                log_debug("%s/%s: not a regular file, ignoring.", *path, de->d_name);
+                                continue;
+                        }
+
+                        _cleanup_free_ char *name = xdg_autostart_service_translate_name(de->d_name);
+                        if (!name)
+                                return log_oom();
+
+                        if (hashmap_contains(all_services, name)) {
+                                log_debug("%s/%s: we have already seen \"%s\", ignoring.",
+                                          *path, de->d_name, name);
+                                continue;
+                        }
+
+                        _cleanup_free_ char *fpath = path_join(*path, de->d_name);
+                        if (!fpath)
+                                return log_oom();
+
+                        _cleanup_(xdg_autostart_service_freep) XdgAutostartService *service =
+                                xdg_autostart_service_parse_desktop(fpath);
+                        if (!service)
+                                return log_oom();
+                        service->name = TAKE_PTR(name);
+
+                        r = hashmap_put(all_services, service->name, service);
+                        if (r < 0)
+                                return log_oom();
+                        TAKE_PTR(service);
+                }
+        }
+
+        return 0;
+}
+
+static int run(const char *dest, const char *dest_early, const char *dest_late) {
+        _cleanup_(hashmap_freep) Hashmap *all_services = NULL;
+        XdgAutostartService *service;
+        int r;
+
+        assert_se(dest_late);
+
+        all_services = hashmap_new(&xdgautostartservice_hash_ops);
+        if (!all_services)
+                return log_oom();
+
+        r = enumerate_xdg_autostart(all_services);
+        if (r < 0)
+                return r;
+
+        HASHMAP_FOREACH(service, all_services)
+                (void) xdg_autostart_service_generate_unit(service, dest_late);
+
+        return 0;
+}
+
+DEFINE_MAIN_GENERATOR_FUNCTION(run);
diff --git a/src/xdg-autostart-generator/xdg-autostart-service.c b/src/xdg-autostart-generator/xdg-autostart-service.c
new file mode 100644
index 0000000..4bf57ea
--- /dev/null
+++ b/src/xdg-autostart-generator/xdg-autostart-service.c
@@ -0,0 +1,664 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "xdg-autostart-service.h"
+
+#include "conf-parser.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "generator.h"
+#include "log.h"
+#include "nulstr-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "specifier.h"
+#include "string-util.h"
+#include "strv.h"
+#include "unit-name.h"
+#include "user-util.h"
+
+XdgAutostartService* xdg_autostart_service_free(XdgAutostartService *s) {
+        if (!s)
+                return NULL;
+
+        free(s->name);
+        free(s->path);
+        free(s->description);
+
+        free(s->type);
+        free(s->exec_string);
+        free(s->working_directory);
+
+        strv_free(s->only_show_in);
+        strv_free(s->not_show_in);
+
+        free(s->try_exec);
+        free(s->autostart_condition);
+        free(s->kde_autostart_condition);
+
+        free(s->gnome_autostart_phase);
+
+        return mfree(s);
+}
+
+char *xdg_autostart_service_translate_name(const char *name) {
+        _cleanup_free_ char *c = NULL, *escaped = NULL;
+        char *res;
+
+        c = strdup(name);
+        if (!c)
+                return NULL;
+
+        res = endswith(c, ".desktop");
+        if (res)
+                *res = '\0';
+
+        escaped = unit_name_escape(c);
+        if (!escaped)
+                return NULL;
+
+        return strjoin("app-", escaped, "@autostart.service");
+}
+
+static int xdg_config_parse_bool(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        bool *b = ASSERT_PTR(data);
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+
+        r = parse_boolean(rvalue);
+        if (r < 0)
+                return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), "Invalid value for boolean: %s", rvalue);
+        *b = r;
+        return 0;
+}
+
+/* Unescapes the string in-place, returns non-zero status on error. */
+static int xdg_unescape_string(
+                const char *unit,
+                const char *filename,
+                int line,
+                char *str) {
+
+        char *in;
+        char *out;
+
+        assert(str);
+
+        in = out = str;
+
+        for (; *in; in++, out++) {
+                if (*in == '\\') {
+                        /* Move forward, and ensure it is a valid escape. */
+                        in++;
+
+                        switch (*in) {
+                                case 's':
+                                        *out = ' ';
+                                        break;
+                                case 'n':
+                                        *out = '\n';
+                                        break;
+                                case 't':
+                                        *out = '\t';
+                                        break;
+                                case 'r':
+                                        *out = '\r';
+                                        break;
+                                case '\\':
+                                        *out = '\\';
+                                        break;
+                                case ';':
+                                        /* Technically only permitted for strv. */
+                                        *out = ';';
+                                        break;
+                                default:
+                                        return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), "Undefined escape sequence \\%c.", *in);
+                        }
+
+                        continue;
+                }
+
+                *out = *in;
+        }
+        *out = '\0';
+
+        return 0;
+}
+
+/* Note: We do not bother with unescaping the strings, hence the _raw postfix. */
+static int xdg_config_parse_string(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        _cleanup_free_ char *res = NULL;
+        char **out = ASSERT_PTR(data);
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+
+        /* XDG does not allow duplicate definitions. */
+        if (*out) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0, "Key %s was defined multiple times, ignoring.", lvalue);
+                return 0;
+        }
+
+        res = strdup(rvalue);
+        if (!res)
+                return log_oom();
+
+        r = xdg_unescape_string(unit, filename, line, res);
+        if (r < 0)
+                return r;
+
+        *out = TAKE_PTR(res);
+        return 0;
+}
+
+static int strv_strndup_unescape_and_push(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                char ***sv,
+                size_t *n,
+                const char *start,
+                const char *end) {
+
+        if (end == start)
+                return 0;
+
+        _cleanup_free_ char *copy = NULL;
+        int r;
+
+        copy = strndup(start, end - start);
+        if (!copy)
+                return log_oom();
+
+        r = xdg_unescape_string(unit, filename, line, copy);
+        if (r < 0)
+                return r;
+
+        if (!GREEDY_REALLOC(*sv, *n + 2)) /* One extra for NULL */
+                return log_oom();
+
+        (*sv)[*n] = TAKE_PTR(copy);
+        (*sv)[*n + 1] = NULL;
+        (*n)++;
+
+        return 0;
+}
+
+static int xdg_config_parse_strv(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        char ***ret_sv = ASSERT_PTR(data);
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+
+        /* XDG does not allow duplicate definitions. */
+        if (*ret_sv) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0, "Key %s was already defined, ignoring.", lvalue);
+                return 0;
+        }
+
+        size_t n = 0;
+        _cleanup_strv_free_ char **sv = NULL;
+
+        if (!GREEDY_REALLOC0(sv, 1))
+                return log_oom();
+
+        /* We cannot use strv_split because it does not handle escaping correctly. */
+        const char *start = rvalue, *end;
+
+        for (end = start; *end; end++) {
+                if (*end == '\\') {
+                        /* Move forward, and ensure it is a valid escape. */
+                        end++;
+                        if (!strchr("sntr\\;", *end)) {
+                                log_syntax(unit, LOG_WARNING, filename, line, 0, "Undefined escape sequence \\%c.", *end);
+                                return 0;
+                        }
+                        continue;
+                }
+
+                if (*end == ';') {
+                        r = strv_strndup_unescape_and_push(unit, filename, line,
+                                                           &sv, &n,
+                                                           start, end);
+                        if (r < 0)
+                                return r;
+
+                        start = end + 1;
+                }
+        }
+
+        /* Handle the trailing entry after the last separator */
+        r = strv_strndup_unescape_and_push(unit, filename, line,
+                                           &sv, &n,
+                                           start, end);
+        if (r < 0)
+                return r;
+
+        *ret_sv = TAKE_PTR(sv);
+        return 0;
+}
+
+static int xdg_config_item_table_lookup(
+                const void *table,
+                const char *section,
+                const char *lvalue,
+                ConfigParserCallback *ret_func,
+                int *ret_ltype,
+                void **ret_data,
+                void *userdata) {
+
+        assert(lvalue);
+
+        /* Ignore any keys with [] as those are translations. */
+        if (strchr(lvalue, '[')) {
+                *ret_func = NULL;
+                *ret_ltype = 0;
+                *ret_data = NULL;
+                return 1;
+        }
+
+        return config_item_table_lookup(table, section, lvalue, ret_func, ret_ltype, ret_data, userdata);
+}
+
+XdgAutostartService *xdg_autostart_service_parse_desktop(const char *path) {
+        _cleanup_(xdg_autostart_service_freep) XdgAutostartService *service = NULL;
+        int r;
+
+        service = new0(XdgAutostartService, 1);
+        if (!service)
+                return NULL;
+
+        service->path = strdup(path);
+        if (!service->path)
+                return NULL;
+
+        const ConfigTableItem items[] = {
+                { "Desktop Entry", "Name",                      xdg_config_parse_string, 0, &service->description             },
+                { "Desktop Entry", "Exec",                      xdg_config_parse_string, 0, &service->exec_string             },
+                { "Desktop Entry", "Path",                      xdg_config_parse_string, 0, &service->working_directory       },
+                { "Desktop Entry", "TryExec",                   xdg_config_parse_string, 0, &service->try_exec                },
+                { "Desktop Entry", "Type",                      xdg_config_parse_string, 0, &service->type                    },
+                { "Desktop Entry", "OnlyShowIn",                xdg_config_parse_strv,   0, &service->only_show_in            },
+                { "Desktop Entry", "NotShowIn",                 xdg_config_parse_strv,   0, &service->not_show_in             },
+                { "Desktop Entry", "Hidden",                    xdg_config_parse_bool,   0, &service->hidden                  },
+                { "Desktop Entry", "AutostartCondition",        xdg_config_parse_string, 0, &service->autostart_condition     },
+                { "Desktop Entry", "X-KDE-autostart-condition", xdg_config_parse_string, 0, &service->kde_autostart_condition },
+                { "Desktop Entry", "X-GNOME-Autostart-Phase",   xdg_config_parse_string, 0, &service->gnome_autostart_phase   },
+                { "Desktop Entry", "X-systemd-skip",            xdg_config_parse_bool,   0, &service->systemd_skip            },
+
+                /* Common entries that we do not use currently. */
+                { "Desktop Entry", "Categories",                NULL, 0, NULL},
+                { "Desktop Entry", "Comment",                   NULL, 0, NULL},
+                { "Desktop Entry", "DBusActivatable",           NULL, 0, NULL},
+                { "Desktop Entry", "Encoding",                  NULL, 0, NULL},
+                { "Desktop Entry", "GenericName",               NULL, 0, NULL},
+                { "Desktop Entry", "Icon",                      NULL, 0, NULL},
+                { "Desktop Entry", "Keywords",                  NULL, 0, NULL},
+                { "Desktop Entry", "MimeType",                  NULL, 0, NULL},
+                { "Desktop Entry", "NoDisplay",                 NULL, 0, NULL},
+                { "Desktop Entry", "StartupNotify",             NULL, 0, NULL},
+                { "Desktop Entry", "StartupWMClass",            NULL, 0, NULL},
+                { "Desktop Entry", "Terminal",                  NULL, 0, NULL},
+                { "Desktop Entry", "URL",                       NULL, 0, NULL},
+                { "Desktop Entry", "Version",                   NULL, 0, NULL},
+                {}
+        };
+
+        r = config_parse(NULL, service->path, NULL,
+                         "Desktop Entry\0",
+                         xdg_config_item_table_lookup, items,
+                         CONFIG_PARSE_RELAXED | CONFIG_PARSE_WARN,
+                         service,
+                         NULL);
+        /* If parsing failed, only hide the file so it will still mask others. */
+        if (r < 0) {
+                log_warning_errno(r, "Failed to parse %s, ignoring it", service->path);
+                service->hidden = true;
+        }
+
+        return TAKE_PTR(service);
+}
+
+int xdg_autostart_format_exec_start(
+                const char *exec,
+                char **ret_exec_start) {
+
+        _cleanup_strv_free_ char **exec_split = NULL;
+        char *res;
+        size_t n, i;
+        bool first_arg;
+        int r;
+
+        /*
+         * Unfortunately, there is a mismatch between systemd's idea of $PATH and XDGs. I.e. we need to
+         * ensure that we have an absolute path to support cases where $PATH has been modified from the
+         * default set.
+         *
+         * Note that this is only needed for development environments though; so while it is important, this
+         * should have no effect in production environments.
+         *
+         * To be compliant with the XDG specification, we also need to strip certain parameters and
+         * such. Doing so properly makes parsing the command line unavoidable.
+         *
+         * NOTE: Technically, XDG only specifies " as quotes, while this also accepts '.
+         */
+        r = strv_split_full(&exec_split, exec, NULL, EXTRACT_UNQUOTE | EXTRACT_RELAX);
+        if (r < 0)
+                return r;
+
+        if (strv_isempty(exec_split))
+                return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "Exec line is empty");
+
+        first_arg = true;
+        for (i = n = 0; exec_split[i]; i++) {
+                _cleanup_free_ char *c = NULL, *raw = NULL, *percent = NULL, *tilde_expanded = NULL;
+                ssize_t l;
+
+                l = cunescape(exec_split[i], 0, &c);
+                if (l < 0)
+                        return log_debug_errno(l, "Failed to unescape '%s': %m", exec_split[i]);
+
+                if (first_arg) {
+                        _cleanup_free_ char *executable = NULL;
+
+                        /* This is the executable, find it in $PATH */
+                        first_arg = false;
+                        r = find_executable(c, &executable);
+                        if (r < 0)
+                                return log_info_errno(r, "Exec binary '%s' does not exist: %m", c);
+
+                        free_and_replace(exec_split[n++], executable);
+                        continue;
+                }
+
+                /*
+                 * Remove any standardised XDG fields; we assume they never appear as part of another
+                 * argument as that just does not make any sense as they can be empty (GLib will e.g. turn
+                 * "%f" into an empty argument).  Other implementations may handle this differently.
+                 */
+                if (STR_IN_SET(c,
+                               "%f", "%F",
+                               "%u", "%U",
+                               "%d", "%D",
+                               "%n", "%N",
+                               "%i",          /* Location of icon, could be implemented. */
+                               "%c",          /* Translated application name, could be implemented. */
+                               "%k",          /* Location of desktop file, could be implemented. */
+                               "%v",
+                               "%m"
+                               ))
+                        continue;
+
+                /*
+                 * %% -> % and then % -> %% means that we correctly quote any % and also quote any left over
+                 * (and invalid) % specifier from the desktop file.
+                 */
+                raw = strreplace(c, "%%", "%");
+                if (!raw)
+                        return log_oom();
+                percent = strreplace(raw, "%", "%%");
+                if (!percent)
+                        return log_oom();
+
+                /*
+                 * Expand ~ if it comes at the beginning of an argument to form a path.
+                 *
+                 * The specification does not mandate this, but we do it anyway for compatibility with
+                 * older KDE code, which supported a more shell-like syntax for users making custom entries.
+                 */
+                if (percent[0] == '~' && (isempty(percent + 1) || path_is_absolute(percent + 1))) {
+                        _cleanup_free_ char *home = NULL;
+
+                        r = get_home_dir(&home);
+                        if (r < 0)
+                                return r;
+
+                        tilde_expanded = path_join(home, &percent[1]);
+                        if (!tilde_expanded)
+                                return log_oom();
+                        free_and_replace(exec_split[n++], tilde_expanded);
+                } else
+                        free_and_replace(exec_split[n++], percent);
+        }
+        for (; exec_split[n]; n++)
+                exec_split[n] = mfree(exec_split[n]);
+
+        res = quote_command_line(exec_split, SHELL_ESCAPE_EMPTY);
+        if (!res)
+                return log_oom();
+
+        *ret_exec_start = res;
+        return 0;
+}
+
+static int xdg_autostart_generate_desktop_condition(
+                const XdgAutostartService *service,
+                FILE *f,
+                const char *test_binary,
+                const char *condition) {
+
+        int r;
+
+        /* Generate an ExecCondition for GNOME autostart condition */
+        if (!isempty(condition)) {
+                _cleanup_free_ char *gnome_autostart_condition_path = NULL, *e_autostart_condition = NULL;
+
+                r = find_executable(test_binary, &gnome_autostart_condition_path);
+                if (r < 0) {
+                        log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
+                                       "%s: ExecCondition executable %s not found, unit will not be started automatically: %m",
+                                       service->path, test_binary);
+                        fprintf(f, "# ExecCondition using %s skipped due to missing binary.\n", test_binary);
+                        return 0;
+                }
+
+                e_autostart_condition = cescape(condition);
+                if (!e_autostart_condition)
+                        return log_oom();
+
+                log_debug("%s: ExecCondition converted to %s --condition \"%s\"%s",
+                          service->path, gnome_autostart_condition_path, e_autostart_condition,
+                          special_glyph(SPECIAL_GLYPH_ELLIPSIS));
+
+                fprintf(f,
+                         "ExecCondition=%s --condition \"%s\"\n",
+                         gnome_autostart_condition_path,
+                         e_autostart_condition);
+        }
+
+        return 0;
+}
+
+int xdg_autostart_service_generate_unit(
+                const XdgAutostartService *service,
+                const char *dest) {
+
+        _cleanup_free_ char *path_escaped = NULL, *exec_start = NULL, *unit = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        int r;
+
+        assert(service);
+
+        /* Nothing to do for hidden services. */
+        if (service->hidden) {
+                log_debug("%s: not generating unit, entry is hidden.", service->path);
+                return 0;
+        }
+
+        if (service->systemd_skip) {
+                log_debug("%s: not generating unit, marked as skipped by generator.", service->path);
+                return 0;
+        }
+
+        /* Nothing to do if type is not Application. */
+        if (!streq_ptr(service->type, "Application")) {
+                log_debug("%s: not generating unit, Type=%s is not supported.", service->path, service->type);
+                return 0;
+        }
+
+        if (!service->exec_string) {
+                log_warning("%s: not generating unit, no Exec= line.", service->path);
+                return 0;
+        }
+
+        /* The TryExec key cannot be checked properly from the systemd unit, it is trivial to check using
+         * find_executable though. */
+        if (service->try_exec) {
+                r = find_executable(service->try_exec, NULL);
+                if (r < 0) {
+                        log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
+                                       "%s: not generating unit, could not find TryExec= binary %s: %m",
+                                       service->path, service->try_exec);
+                        return 0;
+                }
+        }
+
+        r = xdg_autostart_format_exec_start(service->exec_string, &exec_start);
+        if (r < 0) {
+                log_full_errno(r == -ENOENT ? LOG_INFO : LOG_WARNING, r,
+                               r == -ENOENT ? "%s: not generating unit, executable specified in Exec= does not exist."
+                                            : "%s: not generating unit, error parsing Exec= line: %m",
+                               service->path);
+                return 0;
+        }
+
+        if (service->gnome_autostart_phase) {
+                /* There is no explicit value for the "Application" phase. */
+                log_debug("%s: not generating unit, startup phases are not supported.", service->path);
+                return 0;
+        }
+
+        path_escaped = specifier_escape(service->path);
+        if (!path_escaped)
+                return log_oom();
+
+        unit = path_join(dest, service->name);
+        if (!unit)
+                return log_oom();
+
+        f = fopen(unit, "wxe");
+        if (!f)
+                return log_error_errno(errno, "%s: failed to create unit file %s: %m", service->path, unit);
+
+        fprintf(f,
+                "# Automatically generated by systemd-xdg-autostart-generator\n\n"
+                "[Unit]\n"
+                "Documentation=man:systemd-xdg-autostart-generator(8)\n"
+                "SourcePath=%s\n"
+                "PartOf=graphical-session.target\n\n",
+                path_escaped);
+
+        if (service->description) {
+                _cleanup_free_ char *t = NULL;
+
+                t = specifier_escape(service->description);
+                if (!t)
+                        return log_oom();
+
+                fprintf(f, "Description=%s\n", t);
+        }
+
+        /* Only start after the session is ready. */
+        fprintf(f,
+                "After=graphical-session.target\n");
+
+        fprintf(f,
+                "\n[Service]\n"
+                "Type=exec\n"
+                "ExitType=cgroup\n"
+                "ExecStart=:%s\n"
+                "Restart=no\n"
+                "TimeoutStopSec=5s\n"
+                "Slice=app.slice\n",
+                exec_start);
+
+        if (service->working_directory) {
+                _cleanup_free_ char *e_working_directory = NULL;
+
+                e_working_directory = cescape(service->working_directory);
+                if (!e_working_directory)
+                        return log_oom();
+
+                fprintf(f, "WorkingDirectory=-%s\n", e_working_directory);
+        }
+
+        /* Generate an ExecCondition to check $XDG_CURRENT_DESKTOP */
+        if (!strv_isempty(service->only_show_in) || !strv_isempty(service->not_show_in)) {
+                _cleanup_free_ char *only_show_in = NULL, *not_show_in = NULL, *e_only_show_in = NULL, *e_not_show_in = NULL;
+
+                only_show_in = strv_join(service->only_show_in, ":");
+                not_show_in = strv_join(service->not_show_in, ":");
+                if (!only_show_in || !not_show_in)
+                        return log_oom();
+
+                e_only_show_in = cescape(only_show_in);
+                e_not_show_in = cescape(not_show_in);
+                if (!e_only_show_in || !e_not_show_in)
+                        return log_oom();
+
+                /* Just assume the values are reasonably sane */
+                fprintf(f,
+                        "ExecCondition=" ROOTLIBEXECDIR "/systemd-xdg-autostart-condition \"%s\" \"%s\"\n",
+                        e_only_show_in,
+                        e_not_show_in);
+        }
+
+        r = xdg_autostart_generate_desktop_condition(service, f,
+                                                     "gnome-systemd-autostart-condition",
+                                                     service->autostart_condition);
+        if (r < 0)
+                return r;
+
+        r = xdg_autostart_generate_desktop_condition(service, f,
+                                                     "kde-systemd-start-condition",
+                                                     service->kde_autostart_condition);
+        if (r < 0)
+                return r;
+
+        log_debug("%s: symlinking %s in xdg-desktop-autostart.target/.wants%s",
+                  service->path, service->name, special_glyph(SPECIAL_GLYPH_ELLIPSIS));
+        return generator_add_symlink(dest, "xdg-desktop-autostart.target", "wants", service->name);
+}
diff --git a/src/xdg-autostart-generator/xdg-autostart-service.h b/src/xdg-autostart-generator/xdg-autostart-service.h
new file mode 100644
index 0000000..61a4a73
--- /dev/null
+++ b/src/xdg-autostart-generator/xdg-autostart-service.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "macro.h"
+
+typedef struct XdgAutostartService {
+        char *name;
+        char *path;
+        char *description; /* Name in XDG desktop file */
+
+        char *type; /* Purely as an assertion check */
+        char *exec_string;
+        char *working_directory;
+
+        char **only_show_in;
+        char **not_show_in;
+
+        char *try_exec;
+        char *autostart_condition; /* This is mostly GNOME specific */
+        char *kde_autostart_condition;
+
+        char *gnome_autostart_phase;
+
+        bool hidden;
+        bool systemd_skip;
+
+} XdgAutostartService;
+
+XdgAutostartService * xdg_autostart_service_free(XdgAutostartService *s);
+DEFINE_TRIVIAL_CLEANUP_FUNC(XdgAutostartService*, xdg_autostart_service_free);
+
+char *xdg_autostart_service_translate_name(const char *name);
+int xdg_autostart_format_exec_start(const char *exec, char **ret_exec_start);
+
+XdgAutostartService *xdg_autostart_service_parse_desktop(const char *path);
+int xdg_autostart_service_generate_unit(const XdgAutostartService *service, const char *dest);