[thirdparty/systemd.git] / src / delta / delta.c

/* SPDX-License-Identifier: LGPL-2.1+ */

#include <errno.h>
#include <getopt.h>
#include <string.h>
#include <sys/prctl.h>
#include <unistd.h>

#include "alloc-util.h"
#include "dirent-util.h"
#include "fd-util.h"
#include "fs-util.h"
#include "hashmap.h"
#include "locale-util.h"
#include "log.h"
#include "pager.h"
#include "parse-util.h"
#include "path-util.h"
#include "process-util.h"
#include "signal-util.h"
#include "stat-util.h"
#include "string-util.h"
#include "strv.h"
#include "terminal-util.h"
#include "util.h"

static const char prefixes[] =
        "/etc\0"
        "/run\0"
        "/usr/local/lib\0"
        "/usr/local/share\0"
        "/usr/lib\0"
        "/usr/share\0"
#if HAVE_SPLIT_USR
        "/lib\0"
#endif
        ;

static const char suffixes[] =
        "sysctl.d\0"
        "tmpfiles.d\0"
        "modules-load.d\0"
        "binfmt.d\0"
        "systemd/system\0"
        "systemd/user\0"
        "systemd/system-preset\0"
        "systemd/user-preset\0"
        "udev/rules.d\0"
        "modprobe.d\0";

static const char have_dropins[] =
        "systemd/system\0"
        "systemd/user\0";

static bool arg_no_pager = false;
static int arg_diff = -1;

static enum {
        SHOW_MASKED     = 1 << 0,
        SHOW_EQUIVALENT = 1 << 1,
        SHOW_REDIRECTED = 1 << 2,
        SHOW_OVERRIDDEN = 1 << 3,
        SHOW_UNCHANGED  = 1 << 4,
        SHOW_EXTENDED   = 1 << 5,

        SHOW_DEFAULTS =
        (SHOW_MASKED | SHOW_EQUIVALENT | SHOW_REDIRECTED | SHOW_OVERRIDDEN | SHOW_EXTENDED)
} arg_flags = 0;

static int equivalent(const char *a, const char *b) {
        _cleanup_free_ char *x = NULL, *y = NULL;
        int r;

        r = chase_symlinks(a, NULL, CHASE_TRAIL_SLASH, &x);
        if (r < 0)
                return r;

        r = chase_symlinks(b, NULL, CHASE_TRAIL_SLASH, &y);
        if (r < 0)
                return r;

        return path_equal(x, y);
}

static int notify_override_masked(const char *top, const char *bottom) {
        if (!(arg_flags & SHOW_MASKED))
                return 0;

        printf("%s%s%s     %s %s %s\n",
               ansi_highlight_red(), "[MASKED]", ansi_normal(),
               top, special_glyph(ARROW), bottom);
        return 1;
}

static int notify_override_equivalent(const char *top, const char *bottom) {
        if (!(arg_flags & SHOW_EQUIVALENT))
                return 0;

        printf("%s%s%s %s %s %s\n",
               ansi_highlight_green(), "[EQUIVALENT]", ansi_normal(),
               top, special_glyph(ARROW), bottom);
        return 1;
}

static int notify_override_redirected(const char *top, const char *bottom) {
        if (!(arg_flags & SHOW_REDIRECTED))
                return 0;

        printf("%s%s%s %s %s %s\n",
               ansi_highlight(), "[REDIRECTED]", ansi_normal(),
               top, special_glyph(ARROW), bottom);
        return 1;
}

static int notify_override_overridden(const char *top, const char *bottom) {
        if (!(arg_flags & SHOW_OVERRIDDEN))
                return 0;

        printf("%s%s%s %s %s %s\n",
               ansi_highlight(), "[OVERRIDDEN]", ansi_normal(),
               top, special_glyph(ARROW), bottom);
        return 1;
}

static int notify_override_extended(const char *top, const char *bottom) {
        if (!(arg_flags & SHOW_EXTENDED))
               return 0;

        printf("%s%s%s   %s %s %s\n",
               ansi_highlight(), "[EXTENDED]", ansi_normal(),
               top, special_glyph(ARROW), bottom);
        return 1;
}

static int notify_override_unchanged(const char *f) {
        if (!(arg_flags & SHOW_UNCHANGED))
                return 0;

        printf("[UNCHANGED]  %s\n", f);
        return 1;
}

static int found_override(const char *top, const char *bottom) {
        _cleanup_free_ char *dest = NULL;
        pid_t pid;
        int r;

        assert(top);
        assert(bottom);

        if (null_or_empty_path(top) > 0)
                return notify_override_masked(top, bottom);

        r = readlink_malloc(top, &dest);
        if (r >= 0) {
                if (equivalent(dest, bottom) > 0)
                        return notify_override_equivalent(top, bottom);
                else
                        return notify_override_redirected(top, bottom);
        }

        r = notify_override_overridden(top, bottom);
        if (!arg_diff)
                return r;

        putchar('\n');

        fflush(stdout);

        r = safe_fork("(diff)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_CLOSE_ALL_FDS|FORK_LOG, &pid);
        if (r < 0)
                return r;
        if (r == 0) {
                execlp("diff", "diff", "-us", "--", bottom, top, NULL);
                log_open();
                log_error_errno(errno, "Failed to execute diff: %m");
                _exit(EXIT_FAILURE);
        }

        (void) wait_for_terminate_and_check("diff", pid, WAIT_LOG_ABNORMAL);
        putchar('\n');

        return r;
}

static int enumerate_dir_d(
                OrderedHashmap *top,
                OrderedHashmap *bottom,
                OrderedHashmap *drops,
                const char *toppath, const char *drop) {

        _cleanup_free_ char *unit = NULL;
        _cleanup_free_ char *path = NULL;
        _cleanup_strv_free_ char **list = NULL;
        char **file;
        char *c;
        int r;

        assert(!endswith(drop, "/"));

        path = strjoin(toppath, "/", drop);
        if (!path)
                return -ENOMEM;

        log_debug("Looking at %s", path);

        unit = strdup(drop);
        if (!unit)
                return -ENOMEM;

        c = strrchr(unit, '.');
        if (!c)
                return -EINVAL;
        *c = 0;

        r = get_files_in_directory(path, &list);
        if (r < 0)
                return log_error_errno(r, "Failed to enumerate %s: %m", path);

        strv_sort(list);

        STRV_FOREACH(file, list) {
                OrderedHashmap *h;
                int k;
                char *p;
                char *d;

                if (!endswith(*file, ".conf"))
                        continue;

                p = strjoin(path, "/", *file);
                if (!p)
                        return -ENOMEM;
                d = p + strlen(toppath) + 1;

                log_debug("Adding at top: %s %s %s", d, special_glyph(ARROW), p);
                k = ordered_hashmap_put(top, d, p);
                if (k >= 0) {
                        p = strdup(p);
                        if (!p)
                                return -ENOMEM;
                        d = p + strlen(toppath) + 1;
                } else if (k != -EEXIST) {
                        free(p);
                        return k;
                }

                log_debug("Adding at bottom: %s %s %s", d, special_glyph(ARROW), p);
                free(ordered_hashmap_remove(bottom, d));
                k = ordered_hashmap_put(bottom, d, p);
                if (k < 0) {
                        free(p);
                        return k;
                }

                h = ordered_hashmap_get(drops, unit);
                if (!h) {
                        h = ordered_hashmap_new(&string_hash_ops);
                        if (!h)
                                return -ENOMEM;
                        ordered_hashmap_put(drops, unit, h);
                        unit = strdup(unit);
                        if (!unit)
                                return -ENOMEM;
                }

                p = strdup(p);
                if (!p)
                        return -ENOMEM;

                log_debug("Adding to drops: %s %s %s %s %s",
                          unit, special_glyph(ARROW), basename(p), special_glyph(ARROW), p);
                k = ordered_hashmap_put(h, basename(p), p);
                if (k < 0) {
                        free(p);
                        if (k != -EEXIST)
                                return k;
                }
        }
        return 0;
}

static int enumerate_dir(
                OrderedHashmap *top,
                OrderedHashmap *bottom,
                OrderedHashmap *drops,
                const char *path, bool dropins) {

        _cleanup_closedir_ DIR *d = NULL;
        struct dirent *de;
        _cleanup_strv_free_ char **files = NULL, **dirs = NULL;
        size_t n_files = 0, allocated_files = 0, n_dirs = 0, allocated_dirs = 0;
        char **t;
        int r;

        assert(top);
        assert(bottom);
        assert(drops);
        assert(path);

        log_debug("Looking at %s", path);

        d = opendir(path);
        if (!d) {
                if (errno == ENOENT)
                        return 0;

                return log_error_errno(errno, "Failed to open %s: %m", path);
        }

        FOREACH_DIRENT_ALL(de, d, return -errno) {
                dirent_ensure_type(d, de);

                if (dropins && de->d_type == DT_DIR && endswith(de->d_name, ".d")) {
                        if (!GREEDY_REALLOC0(dirs, allocated_dirs, n_dirs + 2))
                                return -ENOMEM;

                        dirs[n_dirs] = strdup(de->d_name);
                        if (!dirs[n_dirs])
                                return -ENOMEM;
                        n_dirs ++;
                }

                if (!dirent_is_file(de))
                        continue;

                if (!GREEDY_REALLOC0(files, allocated_files, n_files + 2))
                        return -ENOMEM;

                files[n_files] = strdup(de->d_name);
                if (!files[n_files])
                        return -ENOMEM;
                n_files ++;
        }

        strv_sort(dirs);
        strv_sort(files);

        STRV_FOREACH(t, dirs) {
                r = enumerate_dir_d(top, bottom, drops, path, *t);
                if (r < 0)
                        return r;
        }

        STRV_FOREACH(t, files) {
                _cleanup_free_ char *p = NULL;

                p = strjoin(path, "/", *t);
                if (!p)
                        return -ENOMEM;

                log_debug("Adding at top: %s %s %s", basename(p), special_glyph(ARROW), p);
                r = ordered_hashmap_put(top, basename(p), p);
                if (r >= 0) {
                        p = strdup(p);
                        if (!p)
                                return -ENOMEM;
                } else if (r != -EEXIST)
                        return r;

                log_debug("Adding at bottom: %s %s %s", basename(p), special_glyph(ARROW), p);
                free(ordered_hashmap_remove(bottom, basename(p)));
                r = ordered_hashmap_put(bottom, basename(p), p);
                if (r < 0)
                        return r;
                p = NULL;
        }

        return 0;
}

static bool should_skip_path(const char *prefix, const char *suffix) {
#if HAVE_SPLIT_USR
        _cleanup_free_ char *target = NULL;
        const char *p;
        char *dirname;

        dirname = strjoina(prefix, "/", suffix);

        if (chase_symlinks(dirname, NULL, 0, &target) < 0)
                return false;

        NULSTR_FOREACH(p, prefixes) {
                if (path_startswith(dirname, p))
                        continue;

                if (path_equal(target, strjoina(p, "/", suffix))) {
                        log_debug("%s redirects to %s, skipping.", dirname, target);
                        return true;
                }
        }
#endif
        return false;
}

static int process_suffix(const char *suffix, const char *onlyprefix) {
        const char *p;
        char *f;
        OrderedHashmap *top, *bottom, *drops;
        OrderedHashmap *h;
        char *key;
        int r = 0, k;
        Iterator i, j;
        int n_found = 0;
        bool dropins;

        assert(suffix);
        assert(!startswith(suffix, "/"));
        assert(!strstr(suffix, "//"));

        dropins = nulstr_contains(have_dropins, suffix);

        top = ordered_hashmap_new(&string_hash_ops);
        bottom = ordered_hashmap_new(&string_hash_ops);
        drops = ordered_hashmap_new(&string_hash_ops);
        if (!top || !bottom || !drops) {
                r = -ENOMEM;
                goto finish;
        }

        NULSTR_FOREACH(p, prefixes) {
                _cleanup_free_ char *t = NULL;

                if (should_skip_path(p, suffix))
                        continue;

                t = strjoin(p, "/", suffix);
                if (!t) {
                        r = -ENOMEM;
                        goto finish;
                }

                k = enumerate_dir(top, bottom, drops, t, dropins);
                if (r == 0)
                        r = k;
        }

        ORDERED_HASHMAP_FOREACH_KEY(f, key, top, i) {
                char *o;

                o = ordered_hashmap_get(bottom, key);
                assert(o);

                if (!onlyprefix || startswith(o, onlyprefix)) {
                        if (path_equal(o, f)) {
                                notify_override_unchanged(f);
                        } else {
                                k = found_override(f, o);
                                if (k < 0)
                                        r = k;
                                else
                                        n_found += k;
                        }
                }

                h = ordered_hashmap_get(drops, key);
                if (h)
                        ORDERED_HASHMAP_FOREACH(o, h, j)
                                if (!onlyprefix || startswith(o, onlyprefix))
                                        n_found += notify_override_extended(f, o);
        }

finish:
        ordered_hashmap_free_free(top);
        ordered_hashmap_free_free(bottom);

        ORDERED_HASHMAP_FOREACH_KEY(h, key, drops, i) {
                ordered_hashmap_free_free(ordered_hashmap_remove(drops, key));
                ordered_hashmap_remove(drops, key);
                free(key);
        }
        ordered_hashmap_free(drops);

        return r < 0 ? r : n_found;
}

static int process_suffixes(const char *onlyprefix) {
        const char *n;
        int n_found = 0, r;

        NULSTR_FOREACH(n, suffixes) {
                r = process_suffix(n, onlyprefix);
                if (r < 0)
                        return r;

                n_found += r;
        }

        return n_found;
}

static int process_suffix_chop(const char *arg) {
        const char *p;

        assert(arg);

        if (!path_is_absolute(arg))
                return process_suffix(arg, NULL);

        /* Strip prefix from the suffix */
        NULSTR_FOREACH(p, prefixes) {
                const char *suffix;

                suffix = startswith(arg, p);
                if (suffix) {
                        suffix += strspn(suffix, "/");
                        if (*suffix)
                                return process_suffix(suffix, p);
                        else
                                return process_suffixes(arg);
                }
        }

        log_error("Invalid suffix specification %s.", arg);
        return -EINVAL;
}

static void help(void) {
        printf("%s [OPTIONS...] [SUFFIX...]\n\n"
               "Find overridden configuration files.\n\n"
               "  -h --help           Show this help\n"
               "     --version        Show package version\n"
               "     --no-pager       Do not pipe output into a pager\n"
               "     --diff[=1|0]     Show a diff when overridden files differ\n"
               "  -t --type=LIST...   Only display a selected set of override types\n"
               , program_invocation_short_name);
}

static int parse_flags(const char *flag_str, int flags) {
        const char *word, *state;
        size_t l;

        FOREACH_WORD_SEPARATOR(word, l, flag_str, ",", state) {
                if (strneq("masked", word, l))
                        flags |= SHOW_MASKED;
                else if (strneq ("equivalent", word, l))
                        flags |= SHOW_EQUIVALENT;
                else if (strneq("redirected", word, l))
                        flags |= SHOW_REDIRECTED;
                else if (strneq("overridden", word, l))
                        flags |= SHOW_OVERRIDDEN;
                else if (strneq("unchanged", word, l))
                        flags |= SHOW_UNCHANGED;
                else if (strneq("extended", word, l))
                        flags |= SHOW_EXTENDED;
                else if (strneq("default", word, l))
                        flags |= SHOW_DEFAULTS;
                else
                        return -EINVAL;
        }
        return flags;
}

static int parse_argv(int argc, char *argv[]) {

        enum {
                ARG_NO_PAGER = 0x100,
                ARG_DIFF,
                ARG_VERSION
        };

        static const struct option options[] = {
                { "help",      no_argument,       NULL, 'h'          },
                { "version",   no_argument,       NULL, ARG_VERSION  },
                { "no-pager",  no_argument,       NULL, ARG_NO_PAGER },
                { "diff",      optional_argument, NULL, ARG_DIFF     },
                { "type",      required_argument, NULL, 't'          },
                {}
        };

        int c;

        assert(argc >= 1);
        assert(argv);

        while ((c = getopt_long(argc, argv, "ht:", options, NULL)) >= 0)

                switch (c) {

                case 'h':
                        help();
                        return 0;

                case ARG_VERSION:
                        return version();

                case ARG_NO_PAGER:
                        arg_no_pager = true;
                        break;

                case 't': {
                        int f;
                        f = parse_flags(optarg, arg_flags);
                        if (f < 0) {
                                log_error("Failed to parse flags field.");
                                return -EINVAL;
                        }
                        arg_flags = f;
                        break;
                }

                case ARG_DIFF:
                        if (!optarg)
                                arg_diff = 1;
                        else {
                                int b;

                                b = parse_boolean(optarg);
                                if (b < 0) {
                                        log_error("Failed to parse diff boolean.");
                                        return -EINVAL;
                                }

                                arg_diff = b;
                        }
                        break;

                case '?':
                        return -EINVAL;

                default:
                        assert_not_reached("Unhandled option");
                }

        return 1;
}

int main(int argc, char *argv[]) {
        int r, k, n_found = 0;

        log_parse_environment();
        log_open();

        r = parse_argv(argc, argv);
        if (r <= 0)
                goto finish;

        if (arg_flags == 0)
                arg_flags = SHOW_DEFAULTS;

        if (arg_diff < 0)
                arg_diff = !!(arg_flags & SHOW_OVERRIDDEN);
        else if (arg_diff)
                arg_flags |= SHOW_OVERRIDDEN;

        (void) pager_open(arg_no_pager, false);

        if (optind < argc) {
                int i;

                for (i = optind; i < argc; i++) {
                        path_simplify(argv[i], false);

                        k = process_suffix_chop(argv[i]);
                        if (k < 0)
                                r = k;
                        else
                                n_found += k;
                }

        } else {
                k = process_suffixes(NULL);
                if (k < 0)
                        r = k;
                else
                        n_found += k;
        }

        if (r >= 0)
                printf("%s%i overridden configuration files found.\n", n_found ? "\n" : "", n_found);

finish:
        pager_close();

        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
7e8d5761 LP	2
7e8d5761 LP	3	#include <errno.h>
7e8d5761	4	#include <getopt.h>
3f6fd1ba	5	#include <string.h>
ce30c8dc	6	#include <sys/prctl.h>
3f6fd1ba	7	#include <unistd.h>
7e8d5761	8
b5efdb8a	9	#include "alloc-util.h"
a0956174	10	#include "dirent-util.h"
3ffd4af2	11	#include "fd-util.h"
f4f15635	12	#include "fs-util.h"
7e8d5761	13	#include "hashmap.h"
8752c575	14	#include "locale-util.h"
7e8d5761 LP	15	#include "log.h"
7e8d5761 LP	16	#include "pager.h"
6bedfcbb	17	#include "parse-util.h"
3f6fd1ba	18	#include "path-util.h"
0b452006	19	#include "process-util.h"
ce30c8dc	20	#include "signal-util.h"
8fcde012	21	#include "stat-util.h"
07630cea	22	#include "string-util.h"
3f6fd1ba LP	23	#include "strv.h"
	24	#include "terminal-util.h"
	25	#include "util.h"
7e8d5761	26
f939e9a4 ZJS	27	static const char prefixes[] =
	28	"/etc\0"
	29	"/run\0"
	30	"/usr/local/lib\0"
	31	"/usr/local/share\0"
	32	"/usr/lib\0"
	33	"/usr/share\0"
349cc4a5	34	#if HAVE_SPLIT_USR
f939e9a4 ZJS	35	"/lib\0"
	36	#endif
	37	;
	38
	39	static const char suffixes[] =
	40	"sysctl.d\0"
	41	"tmpfiles.d\0"
	42	"modules-load.d\0"
	43	"binfmt.d\0"
	44	"systemd/system\0"
	45	"systemd/user\0"
	46	"systemd/system-preset\0"
	47	"systemd/user-preset\0"
	48	"udev/rules.d\0"
	49	"modprobe.d\0";
	50
	51	static const char have_dropins[] =
	52	"systemd/system\0"
	53	"systemd/user\0";
	54
7e8d5761	55	static bool arg_no_pager = false;
866062b1	56	static int arg_diff = -1;
7e8d5761	57
866062b1	58	static enum {
ef31828d	59	SHOW_MASKED = 1 << 0,
c8021373 LP	60	SHOW_EQUIVALENT = 1 << 1,
c8021373 LP	61	SHOW_REDIRECTED = 1 << 2,
386da858	62	SHOW_OVERRIDDEN = 1 << 3,
ef31828d LP	63	SHOW_UNCHANGED = 1 << 4,
ef31828d LP	64	SHOW_EXTENDED = 1 << 5,
4c4e6431 LP	65
4c4e6431 LP	66	SHOW_DEFAULTS =
0000ce05	67	(SHOW_MASKED \| SHOW_EQUIVALENT \| SHOW_REDIRECTED \| SHOW_OVERRIDDEN \| SHOW_EXTENDED)
866062b1	68	} arg_flags = 0;
4c4e6431	69
7e8d5761	70	static int equivalent(const char a, const char b) {
e26970a8	71	_cleanup_free_ char x = NULL, y = NULL;
e1873695	72	int r;
7e8d5761	73
62570f6f	74	r = chase_symlinks(a, NULL, CHASE_TRAIL_SLASH, &x);
e1873695 LP	75	if (r < 0)
e1873695 LP	76	return r;
7e8d5761	77
62570f6f	78	r = chase_symlinks(b, NULL, CHASE_TRAIL_SLASH, &y);
e1873695 LP	79	if (r < 0)
e1873695 LP	80	return r;
7e8d5761	81
e26970a8	82	return path_equal(x, y);
7e8d5761 LP	83	}
7e8d5761 LP	84
866062b1 LP	85	static int notify_override_masked(const char top, const char bottom) {
866062b1 LP	86	if (!(arg_flags & SHOW_MASKED))
807f4645 GN	87	return 0;
807f4645 GN	88
00a5cc3a	89	printf("%s%s%s %s %s %s\n",
1fc464f6	90	ansi_highlight_red(), "[MASKED]", ansi_normal(),
323b7dc9	91	top, special_glyph(ARROW), bottom);
807f4645 GN	92	return 1;
	93	}
	94
866062b1 LP	95	static int notify_override_equivalent(const char top, const char bottom) {
866062b1 LP	96	if (!(arg_flags & SHOW_EQUIVALENT))
807f4645 GN	97	return 0;
807f4645 GN	98
00a5cc3a	99	printf("%s%s%s %s %s %s\n",
1fc464f6	100	ansi_highlight_green(), "[EQUIVALENT]", ansi_normal(),
323b7dc9	101	top, special_glyph(ARROW), bottom);
807f4645 GN	102	return 1;
	103	}
	104
866062b1 LP	105	static int notify_override_redirected(const char top, const char bottom) {
866062b1 LP	106	if (!(arg_flags & SHOW_REDIRECTED))
807f4645 GN	107	return 0;
807f4645 GN	108
9b6e0ce5	109	printf("%s%s%s %s %s %s\n",
1fc464f6	110	ansi_highlight(), "[REDIRECTED]", ansi_normal(),
323b7dc9	111	top, special_glyph(ARROW), bottom);
807f4645 GN	112	return 1;
	113	}
	114
386da858 NM	115	static int notify_override_overridden(const char top, const char bottom) {
386da858 NM	116	if (!(arg_flags & SHOW_OVERRIDDEN))
807f4645 GN	117	return 0;
807f4645 GN	118
00a5cc3a	119	printf("%s%s%s %s %s %s\n",
1fc464f6	120	ansi_highlight(), "[OVERRIDDEN]", ansi_normal(),
323b7dc9	121	top, special_glyph(ARROW), bottom);
807f4645 GN	122	return 1;
	123	}
	124
0000ce05 LN	125	static int notify_override_extended(const char top, const char bottom) {
	126	if (!(arg_flags & SHOW_EXTENDED))
	127	return 0;
	128
00a5cc3a	129	printf("%s%s%s %s %s %s\n",
1fc464f6	130	ansi_highlight(), "[EXTENDED]", ansi_normal(),
323b7dc9	131	top, special_glyph(ARROW), bottom);
0000ce05 LN	132	return 1;
	133	}
	134
866062b1 LP	135	static int notify_override_unchanged(const char *f) {
866062b1 LP	136	if (!(arg_flags & SHOW_UNCHANGED))
807f4645 GN	137	return 0;
807f4645 GN	138
8e812a23	139	printf("[UNCHANGED] %s\n", f);
807f4645 GN	140	return 1;
	141	}
	142
866062b1	143	static int found_override(const char top, const char bottom) {
e26970a8	144	_cleanup_free_ char *dest = NULL;
7e8d5761	145	pid_t pid;
4c253ed1	146	int r;
7e8d5761 LP	147
	148	assert(top);
	149	assert(bottom);
	150
8fd57568 ZJS	151	if (null_or_empty_path(top) > 0)
8fd57568 ZJS	152	return notify_override_masked(top, bottom);
7e8d5761	153
4c253ed1 LP	154	r = readlink_malloc(top, &dest);
4c253ed1 LP	155	if (r >= 0) {
7e8d5761	156	if (equivalent(dest, bottom) > 0)
8fd57568	157	return notify_override_equivalent(top, bottom);
7e8d5761	158	else
8fd57568	159	return notify_override_redirected(top, bottom);
7e8d5761 LP	160	}
7e8d5761 LP	161
4c253ed1	162	r = notify_override_overridden(top, bottom);
866062b1	163	if (!arg_diff)
4c253ed1	164	return r;
7e8d5761 LP	165
	166	putchar('\n');
	167
	168	fflush(stdout);
	169
b6e1fff1	170	r = safe_fork("(diff)", FORK_RESET_SIGNALS\|FORK_DEATHSIG\|FORK_CLOSE_ALL_FDS\|FORK_LOG, &pid);
4c253ed1	171	if (r < 0)
b6e1fff1	172	return r;
4c253ed1	173	if (r == 0) {
7e8d5761	174	execlp("diff", "diff", "-us", "--", bottom, top, NULL);
0b1f3c76	175	log_open();
56f64d95	176	log_error_errno(errno, "Failed to execute diff: %m");
ce30c8dc	177	_exit(EXIT_FAILURE);
7e8d5761 LP	178	}
7e8d5761 LP	179
7d4904fe	180	(void) wait_for_terminate_and_check("diff", pid, WAIT_LOG_ABNORMAL);
7e8d5761 LP	181	putchar('\n');
7e8d5761 LP	182
4c253ed1	183	return r;
7e8d5761 LP	184	}
7e8d5761 LP	185
9f5ebb8a ZJS	186	static int enumerate_dir_d(
	187	OrderedHashmap *top,
	188	OrderedHashmap *bottom,
	189	OrderedHashmap *drops,
	190	const char toppath, const char drop) {
	191
f939e9a4	192	_cleanup_free_ char *unit = NULL;
0000ce05 LN	193	_cleanup_free_ char *path = NULL;
	194	_cleanup_strv_free_ char **list = NULL;
	195	char **file;
	196	char *c;
	197	int r;
	198
f939e9a4 ZJS	199	assert(!endswith(drop, "/"));
f939e9a4 ZJS	200
605405c6	201	path = strjoin(toppath, "/", drop);
0000ce05 LN	202	if (!path)
	203	return -ENOMEM;
	204
f939e9a4	205	log_debug("Looking at %s", path);
0000ce05	206
f939e9a4 ZJS	207	unit = strdup(drop);
f939e9a4 ZJS	208	if (!unit)
0000ce05 LN	209	return -ENOMEM;
0000ce05 LN	210
f939e9a4	211	c = strrchr(unit, '.');
0000ce05 LN	212	if (!c)
	213	return -EINVAL;
	214	*c = 0;
	215
	216	r = get_files_in_directory(path, &list);
23bbb0de MS	217	if (r < 0)
23bbb0de MS	218	return log_error_errno(r, "Failed to enumerate %s: %m", path);
0000ce05	219
9f5ebb8a ZJS	220	strv_sort(list);
9f5ebb8a ZJS	221
0000ce05	222	STRV_FOREACH(file, list) {
9f5ebb8a	223	OrderedHashmap *h;
0000ce05 LN	224	int k;
	225	char *p;
	226	char *d;
	227
	228	if (!endswith(*file, ".conf"))
	229	continue;
	230
605405c6	231	p = strjoin(path, "/", *file);
0000ce05 LN	232	if (!p)
0000ce05 LN	233	return -ENOMEM;
f939e9a4	234	d = p + strlen(toppath) + 1;
0000ce05	235
323b7dc9	236	log_debug("Adding at top: %s %s %s", d, special_glyph(ARROW), p);
9f5ebb8a	237	k = ordered_hashmap_put(top, d, p);
0000ce05 LN	238	if (k >= 0) {
	239	p = strdup(p);
	240	if (!p)
	241	return -ENOMEM;
f939e9a4	242	d = p + strlen(toppath) + 1;
0000ce05 LN	243	} else if (k != -EEXIST) {
	244	free(p);
	245	return k;
	246	}
	247
323b7dc9	248	log_debug("Adding at bottom: %s %s %s", d, special_glyph(ARROW), p);
9f5ebb8a ZJS	249	free(ordered_hashmap_remove(bottom, d));
9f5ebb8a ZJS	250	k = ordered_hashmap_put(bottom, d, p);
0000ce05 LN	251	if (k < 0) {
	252	free(p);
	253	return k;
	254	}
	255
9f5ebb8a	256	h = ordered_hashmap_get(drops, unit);
0000ce05	257	if (!h) {
9f5ebb8a	258	h = ordered_hashmap_new(&string_hash_ops);
0000ce05 LN	259	if (!h)
0000ce05 LN	260	return -ENOMEM;
9f5ebb8a	261	ordered_hashmap_put(drops, unit, h);
f939e9a4 ZJS	262	unit = strdup(unit);
f939e9a4 ZJS	263	if (!unit)
0000ce05 LN	264	return -ENOMEM;
	265	}
	266
	267	p = strdup(p);
	268	if (!p)
	269	return -ENOMEM;
	270
00a5cc3a	271	log_debug("Adding to drops: %s %s %s %s %s",
323b7dc9	272	unit, special_glyph(ARROW), basename(p), special_glyph(ARROW), p);
9f5ebb8a	273	k = ordered_hashmap_put(h, basename(p), p);
0000ce05 LN	274	if (k < 0) {
	275	free(p);
	276	if (k != -EEXIST)
	277	return k;
	278	}
	279	}
	280	return 0;
	281	}
	282
9f5ebb8a ZJS	283	static int enumerate_dir(
	284	OrderedHashmap *top,
	285	OrderedHashmap *bottom,
	286	OrderedHashmap *drops,
	287	const char *path, bool dropins) {
	288
	289	_cleanup_closedir_ DIR *d = NULL;
8fb3f009	290	struct dirent *de;
9f5ebb8a ZJS	291	_cleanup_strv_free_ char files = NULL, dirs = NULL;
	292	size_t n_files = 0, allocated_files = 0, n_dirs = 0, allocated_dirs = 0;
	293	char **t;
	294	int r;
7e8d5761 LP	295
	296	assert(top);
	297	assert(bottom);
0000ce05	298	assert(drops);
7e8d5761 LP	299	assert(path);
7e8d5761 LP	300
f939e9a4 ZJS	301	log_debug("Looking at %s", path);
f939e9a4 ZJS	302
7e8d5761 LP	303	d = opendir(path);
	304	if (!d) {
	305	if (errno == ENOENT)
	306	return 0;
	307
e1427b13	308	return log_error_errno(errno, "Failed to open %s: %m", path);
7e8d5761 LP	309	}
7e8d5761 LP	310
8fb3f009	311	FOREACH_DIRENT_ALL(de, d, return -errno) {
277f2f75 LN	312	dirent_ensure_type(d, de);
277f2f75 LN	313
9f5ebb8a ZJS	314	if (dropins && de->d_type == DT_DIR && endswith(de->d_name, ".d")) {
	315	if (!GREEDY_REALLOC0(dirs, allocated_dirs, n_dirs + 2))
	316	return -ENOMEM;
	317
	318	dirs[n_dirs] = strdup(de->d_name);
	319	if (!dirs[n_dirs])
	320	return -ENOMEM;
	321	n_dirs ++;
	322	}
0000ce05	323
7e8d5761 LP	324	if (!dirent_is_file(de))
	325	continue;
	326
9f5ebb8a ZJS	327	if (!GREEDY_REALLOC0(files, allocated_files, n_files + 2))
	328	return -ENOMEM;
	329
	330	files[n_files] = strdup(de->d_name);
	331	if (!files[n_files])
	332	return -ENOMEM;
	333	n_files ++;
	334	}
	335
	336	strv_sort(dirs);
	337	strv_sort(files);
	338
	339	STRV_FOREACH(t, dirs) {
	340	r = enumerate_dir_d(top, bottom, drops, path, *t);
	341	if (r < 0)
	342	return r;
	343	}
	344
	345	STRV_FOREACH(t, files) {
	346	_cleanup_free_ char *p = NULL;
	347
	348	p = strjoin(path, "/", *t);
e26970a8 TA	349	if (!p)
e26970a8 TA	350	return -ENOMEM;
7e8d5761	351
323b7dc9	352	log_debug("Adding at top: %s %s %s", basename(p), special_glyph(ARROW), p);
9f5ebb8a ZJS	353	r = ordered_hashmap_put(top, basename(p), p);
9f5ebb8a ZJS	354	if (r >= 0) {
7e8d5761	355	p = strdup(p);
e26970a8 TA	356	if (!p)
e26970a8 TA	357	return -ENOMEM;
9f5ebb8a ZJS	358	} else if (r != -EEXIST)
9f5ebb8a ZJS	359	return r;
7e8d5761	360
323b7dc9	361	log_debug("Adding at bottom: %s %s %s", basename(p), special_glyph(ARROW), p);
9f5ebb8a ZJS	362	free(ordered_hashmap_remove(bottom, basename(p)));
	363	r = ordered_hashmap_put(bottom, basename(p), p);
	364	if (r < 0)
	365	return r;
	366	p = NULL;
7e8d5761	367	}
9f5ebb8a	368
8fb3f009	369	return 0;
7e8d5761 LP	370	}
7e8d5761 LP	371
4cc893e7	372	static bool should_skip_path(const char prefix, const char suffix) {
349cc4a5	373	#if HAVE_SPLIT_USR
b05422a8	374	_cleanup_free_ char *target = NULL;
4cc893e7 FB	375	const char *p;
4cc893e7 FB	376	char *dirname;
b05422a8	377
4cc893e7	378	dirname = strjoina(prefix, "/", suffix);
b05422a8	379
4cc893e7 FB	380	if (chase_symlinks(dirname, NULL, 0, &target) < 0)
	381	return false;
	382
	383	NULSTR_FOREACH(p, prefixes) {
	384	if (path_startswith(dirname, p))
	385	continue;
	386
	387	if (path_equal(target, strjoina(p, "/", suffix))) {
	388	log_debug("%s redirects to %s, skipping.", dirname, target);
	389	return true;
	390	}
	391	}
b05422a8	392	#endif
4cc893e7	393	return false;
b05422a8 FS	394	}
b05422a8 FS	395
6096dfd6	396	static int process_suffix(const char suffix, const char onlyprefix) {
7e8d5761 LP	397	const char *p;
7e8d5761 LP	398	char *f;
9f5ebb8a ZJS	399	OrderedHashmap top, bottom, *drops;
9f5ebb8a ZJS	400	OrderedHashmap *h;
0000ce05	401	char *key;
7e8d5761	402	int r = 0, k;
0000ce05	403	Iterator i, j;
7e8d5761	404	int n_found = 0;
f939e9a4	405	bool dropins;
7e8d5761	406
7e8d5761	407	assert(suffix);
f939e9a4 ZJS	408	assert(!startswith(suffix, "/"));
f939e9a4 ZJS	409	assert(!strstr(suffix, "//"));
7e8d5761	410
f939e9a4	411	dropins = nulstr_contains(have_dropins, suffix);
7e8d5761	412
9f5ebb8a ZJS	413	top = ordered_hashmap_new(&string_hash_ops);
	414	bottom = ordered_hashmap_new(&string_hash_ops);
	415	drops = ordered_hashmap_new(&string_hash_ops);
f939e9a4	416	if (!top \|\| !bottom \|\| !drops) {
0000ce05 LN	417	r = -ENOMEM;
	418	goto finish;
	419	}
	420
7e8d5761	421	NULSTR_FOREACH(p, prefixes) {
e26970a8	422	_cleanup_free_ char *t = NULL;
b05422a8	423
4cc893e7	424	if (should_skip_path(p, suffix))
b05422a8	425	continue;
7e8d5761	426
605405c6	427	t = strjoin(p, "/", suffix);
7e8d5761 LP	428	if (!t) {
	429	r = -ENOMEM;
	430	goto finish;
	431	}
	432
0000ce05	433	k = enumerate_dir(top, bottom, drops, t, dropins);
f939e9a4	434	if (r == 0)
7e8d5761	435	r = k;
7e8d5761 LP	436	}
7e8d5761 LP	437
9f5ebb8a	438	ORDERED_HASHMAP_FOREACH_KEY(f, key, top, i) {
7e8d5761 LP	439	char *o;
7e8d5761 LP	440
9f5ebb8a	441	o = ordered_hashmap_get(bottom, key);
7e8d5761 LP	442	assert(o);
7e8d5761 LP	443
6096dfd6 ZJS	444	if (!onlyprefix \|\| startswith(o, onlyprefix)) {
	445	if (path_equal(o, f)) {
	446	notify_override_unchanged(f);
	447	} else {
	448	k = found_override(f, o);
	449	if (k < 0)
	450	r = k;
	451	else
	452	n_found += k;
	453	}
807f4645	454	}
7e8d5761	455
9f5ebb8a	456	h = ordered_hashmap_get(drops, key);
0000ce05	457	if (h)
9f5ebb8a	458	ORDERED_HASHMAP_FOREACH(o, h, j)
6096dfd6 ZJS	459	if (!onlyprefix \|\| startswith(o, onlyprefix))
6096dfd6 ZJS	460	n_found += notify_override_extended(f, o);
7e8d5761 LP	461	}
	462
	463	finish:
9f5ebb8a ZJS	464	ordered_hashmap_free_free(top);
9f5ebb8a ZJS	465	ordered_hashmap_free_free(bottom);
82376245	466
9f5ebb8a ZJS	467	ORDERED_HASHMAP_FOREACH_KEY(h, key, drops, i) {
	468	ordered_hashmap_free_free(ordered_hashmap_remove(drops, key));
	469	ordered_hashmap_remove(drops, key);
82376245	470	free(key);
0000ce05	471	}
9f5ebb8a	472	ordered_hashmap_free(drops);
82376245	473
7e8d5761 LP	474	return r < 0 ? r : n_found;
	475	}
	476
6096dfd6 ZJS	477	static int process_suffixes(const char *onlyprefix) {
	478	const char *n;
	479	int n_found = 0, r;
	480
	481	NULSTR_FOREACH(n, suffixes) {
	482	r = process_suffix(n, onlyprefix);
	483	if (r < 0)
	484	return r;
82376245 LP	485
82376245 LP	486	n_found += r;
6096dfd6	487	}
82376245	488
6096dfd6 ZJS	489	return n_found;
	490	}
	491
	492	static int process_suffix_chop(const char *arg) {
7e8d5761 LP	493	const char *p;
7e8d5761 LP	494
6096dfd6	495	assert(arg);
7e8d5761	496
6096dfd6 ZJS	497	if (!path_is_absolute(arg))
6096dfd6 ZJS	498	return process_suffix(arg, NULL);
7e8d5761 LP	499
	500	/* Strip prefix from the suffix */
	501	NULSTR_FOREACH(p, prefixes) {
82376245 LP	502	const char *suffix;
	503
	504	suffix = startswith(arg, p);
6096dfd6	505	if (suffix) {
7e8d5761	506	suffix += strspn(suffix, "/");
6096dfd6	507	if (*suffix)
a9d041fa	508	return process_suffix(suffix, p);
6096dfd6 ZJS	509	else
6096dfd6 ZJS	510	return process_suffixes(arg);
7e8d5761 LP	511	}
	512	}
	513
6096dfd6	514	log_error("Invalid suffix specification %s.", arg);
7e8d5761 LP	515	return -EINVAL;
	516	}
	517
601185b4	518	static void help(void) {
7e8d5761 LP	519	printf("%s [OPTIONS...] [SUFFIX...]\n\n"
	520	"Find overridden configuration files.\n\n"
	521	" -h --help Show this help\n"
	522	" --version Show package version\n"
807f4645	523	" --no-pager Do not pipe output into a pager\n"
386da858	524	" --diff[=1\|0] Show a diff when overridden files differ\n"
601185b4 ZJS	525	" -t --type=LIST... Only display a selected set of override types\n"
601185b4 ZJS	526	, program_invocation_short_name);
7e8d5761 LP	527	}
7e8d5761 LP	528
866062b1	529	static int parse_flags(const char *flag_str, int flags) {
a2a5291b	530	const char word, state;
807f4645 GN	531	size_t l;
807f4645 GN	532
d0a2e1c3	533	FOREACH_WORD_SEPARATOR(word, l, flag_str, ",", state) {
a2a5291b	534	if (strneq("masked", word, l))
807f4645	535	flags \|= SHOW_MASKED;
a2a5291b	536	else if (strneq ("equivalent", word, l))
c8021373	537	flags \|= SHOW_EQUIVALENT;
a2a5291b	538	else if (strneq("redirected", word, l))
c8021373	539	flags \|= SHOW_REDIRECTED;
a2a5291b	540	else if (strneq("overridden", word, l))
386da858	541	flags \|= SHOW_OVERRIDDEN;
a2a5291b	542	else if (strneq("unchanged", word, l))
807f4645	543	flags \|= SHOW_UNCHANGED;
a2a5291b	544	else if (strneq("extended", word, l))
0000ce05	545	flags \|= SHOW_EXTENDED;
a2a5291b	546	else if (strneq("default", word, l))
807f4645	547	flags \|= SHOW_DEFAULTS;
866062b1 LP	548	else
866062b1 LP	549	return -EINVAL;
807f4645 GN	550	}
	551	return flags;
	552	}
	553
866062b1	554	static int parse_argv(int argc, char *argv[]) {
7e8d5761 LP	555
	556	enum {
	557	ARG_NO_PAGER = 0x100,
807f4645	558	ARG_DIFF,
7e8d5761 LP	559	ARG_VERSION
	560	};
	561
	562	static const struct option options[] = {
	563	{ "help", no_argument, NULL, 'h' },
	564	{ "version", no_argument, NULL, ARG_VERSION },
	565	{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
807f4645 GN	566	{ "diff", optional_argument, NULL, ARG_DIFF },
807f4645 GN	567	{ "type", required_argument, NULL, 't' },
eb9da376	568	{}
7e8d5761 LP	569	};
	570
	571	int c;
	572
	573	assert(argc >= 1);
	574	assert(argv);
	575
601185b4	576	while ((c = getopt_long(argc, argv, "ht:", options, NULL)) >= 0)
7e8d5761 LP	577
	578	switch (c) {
	579
	580	case 'h':
	581	help();
	582	return 0;
	583
	584	case ARG_VERSION:
3f6fd1ba	585	return version();
7e8d5761 LP	586
	587	case ARG_NO_PAGER:
	588	arg_no_pager = true;
	589	break;
	590
866062b1 LP	591	case 't': {
	592	int f;
	593	f = parse_flags(optarg, arg_flags);
	594	if (f < 0) {
	595	log_error("Failed to parse flags field.");
807f4645	596	return -EINVAL;
866062b1 LP	597	}
866062b1 LP	598	arg_flags = f;
807f4645	599	break;
866062b1	600	}
807f4645 GN	601
807f4645 GN	602	case ARG_DIFF:
866062b1 LP	603	if (!optarg)
	604	arg_diff = 1;
	605	else {
	606	int b;
	607
	608	b = parse_boolean(optarg);
	609	if (b < 0) {
	610	log_error("Failed to parse diff boolean.");
	611	return -EINVAL;
82376245 LP	612	}
	613
	614	arg_diff = b;
807f4645 GN	615	}
	616	break;
	617
eb9da376	618	case '?':
7e8d5761	619	return -EINVAL;
eb9da376 LP	620
	621	default:
	622	assert_not_reached("Unhandled option");
7e8d5761	623	}
7e8d5761 LP	624
	625	return 1;
	626	}
	627
	628	int main(int argc, char *argv[]) {
82376245	629	int r, k, n_found = 0;
7e8d5761 LP	630
	631	log_parse_environment();
	632	log_open();
	633
866062b1	634	r = parse_argv(argc, argv);
7e8d5761 LP	635	if (r <= 0)
	636	goto finish;
	637
866062b1 LP	638	if (arg_flags == 0)
	639	arg_flags = SHOW_DEFAULTS;
	640
	641	if (arg_diff < 0)
386da858	642	arg_diff = !!(arg_flags & SHOW_OVERRIDDEN);
866062b1	643	else if (arg_diff)
386da858	644	arg_flags \|= SHOW_OVERRIDDEN;
807f4645	645
ee5324aa	646	(void) pager_open(arg_no_pager, false);
7e8d5761 LP	647
	648	if (optind < argc) {
	649	int i;
	650
	651	for (i = optind; i < argc; i++) {
858d36c1	652	path_simplify(argv[i], false);
82376245	653
f939e9a4	654	k = process_suffix_chop(argv[i]);
7e8d5761 LP	655	if (k < 0)
	656	r = k;
	657	else
	658	n_found += k;
	659	}
	660
	661	} else {
6096dfd6 ZJS	662	k = process_suffixes(NULL);
	663	if (k < 0)
	664	r = k;
	665	else
	666	n_found += k;
7e8d5761 LP	667	}
	668
	669	if (r >= 0)
82376245	670	printf("%s%i overridden configuration files found.\n", n_found ? "\n" : "", n_found);
7e8d5761 LP	671
	672	finish:
	673	pager_close();
	674
	675	return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
	676	}