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-rw-r--r--src/delta/delta.c689
1 files changed, 689 insertions, 0 deletions
diff --git a/src/delta/delta.c b/src/delta/delta.c
new file mode 100644
index 0000000..4295abd
--- /dev/null
+++ b/src/delta/delta.c
@@ -0,0 +1,689 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <getopt.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 "main-func.h"
+#include "nulstr-util.h"
+#include "pager.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "pretty-print.h"
+#include "process-util.h"
+#include "signal-util.h"
+#include "stat-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "terminal-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 PagerFlags arg_pager_flags = 0;
+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, NULL);
+ if (r < 0)
+ return r;
+
+ r = chase_symlinks(b, NULL, CHASE_TRAIL_SLASH, &y, NULL);
+ 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(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(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(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(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(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_RLIMIT_NOFILE_SAFE|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 = path_join(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 = path_join(path, *file);
+ if (!p)
+ return -ENOMEM;
+ d = p + strlen(toppath) + 1;
+
+ log_debug("Adding at top: %s %s %s", d, special_glyph(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(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(SPECIAL_GLYPH_ARROW), basename(p), special_glyph(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 = path_join(path, *t);
+ if (!p)
+ return -ENOMEM;
+
+ log_debug("Adding at top: %s %s %s", basename(p), special_glyph(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(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 int should_skip_path(const char *prefix, const char *suffix) {
+#if HAVE_SPLIT_USR
+ _cleanup_free_ char *target = NULL;
+ const char *dirname, *p;
+
+ dirname = prefix_roota(prefix, suffix);
+
+ if (chase_symlinks(dirname, NULL, 0, &target, NULL) < 0)
+ return false;
+
+ NULSTR_FOREACH(p, prefixes) {
+ _cleanup_free_ char *tmp = NULL;
+
+ if (path_startswith(dirname, p))
+ continue;
+
+ tmp = path_join(p, suffix);
+ if (!tmp)
+ return -ENOMEM;
+
+ if (path_equal(target, tmp)) {
+ 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, *key;
+ OrderedHashmap *top, *bottom, *drops, *h;
+ int r = 0, k, 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) > 0)
+ continue;
+
+ t = path_join(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) {
+ 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)
+ 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) {
+ 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);
+ }
+ }
+
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Invalid suffix specification %s.", arg);
+}
+
+static int help(void) {
+ _cleanup_free_ char *link = NULL;
+ int r;
+
+ r = terminal_urlify_man("systemd-delta", "1", &link);
+ if (r < 0)
+ return log_oom();
+
+ 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"
+ "\nSee the %s for details.\n"
+ , program_invocation_short_name
+ , link
+ );
+
+ return 0;
+}
+
+static int parse_flags(const char *flag_str, int flags) {
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
+ int r;
+
+ r = extract_first_word(&flag_str, &word, ",", EXTRACT_DONT_COALESCE_SEPARATORS);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return flags;
+
+ if (streq(word, "masked"))
+ flags |= SHOW_MASKED;
+ else if (streq(word, "equivalent"))
+ flags |= SHOW_EQUIVALENT;
+ else if (streq(word, "redirected"))
+ flags |= SHOW_REDIRECTED;
+ else if (streq(word, "overridden"))
+ flags |= SHOW_OVERRIDDEN;
+ else if (streq(word, "unchanged"))
+ flags |= SHOW_UNCHANGED;
+ else if (streq(word, "extended"))
+ flags |= SHOW_EXTENDED;
+ else if (streq(word, "default"))
+ flags |= SHOW_DEFAULTS;
+ else
+ return -EINVAL;
+ }
+}
+
+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':
+ return help();
+
+ case ARG_VERSION:
+ return version();
+
+ case ARG_NO_PAGER:
+ arg_pager_flags |= PAGER_DISABLE;
+ break;
+
+ case 't': {
+ int f;
+ f = parse_flags(optarg, arg_flags);
+ if (f < 0)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Failed to parse flags field.");
+ arg_flags = f;
+ break;
+ }
+
+ case ARG_DIFF:
+ if (!optarg)
+ arg_diff = 1;
+ else {
+ int b;
+
+ b = parse_boolean(optarg);
+ if (b < 0)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Failed to parse diff boolean.");
+
+ arg_diff = b;
+ }
+ break;
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached("Unhandled option");
+ }
+
+ return 1;
+}
+
+static int run(int argc, char *argv[]) {
+ int r, k, n_found = 0;
+
+ log_setup_cli();
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ return r;
+
+ 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_pager_flags);
+
+ 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);
+ return r;
+}
+
+DEFINE_MAIN_FUNCTION(run);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 12:31:41 +0000