util: split-out conf-file.[ch]

1 files changed, 151 insertions, 0 deletions

diff --git a/src/shared/conf-files.c b/src/shared/conf-files.c
new file mode 100644
index 000000000..019fadcf5
--- /dev/null
+++ b/src/shared/conf-files.c
@@ -0,0 +1,151 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <assert.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <dirent.h>
+
+#include "macro.h"
+#include "util.h"
+#include "missing.h"
+#include "log.h"
+#include "strv.h"
+#include "hashmap.h"
+#include "conf-files.h"
+
+static int files_add(Hashmap *h, const char *path, const char *suffix) {
+        DIR *dir;
+        struct dirent buffer, *de;
+        int r = 0;
+
+        dir = opendir(path);
+        if (!dir) {
+                if (errno == ENOENT)
+                        return 0;
+                return -errno;
+        }
+
+        for (;;) {
+                int k;
+                char *p;
+
+                k = readdir_r(dir, &buffer, &de);
+                if (k != 0) {
+                        r = -k;
+                        goto finish;
+                }
+
+                if (!de)
+                        break;
+
+                if (!dirent_is_file_with_suffix(de, suffix))
+                        continue;
+
+                if (asprintf(&p, "%s/%s", path, de->d_name) < 0) {
+                        r = -ENOMEM;
+                        goto finish;
+                }
+
+                if (hashmap_put(h, file_name_from_path(p), p) <= 0) {
+                        log_debug("Skip overridden file: %s.", p);
+                        free(p);
+                }
+        }
+
+finish:
+        closedir(dir);
+        return r;
+}
+
+static int base_cmp(const void *a, const void *b) {
+        const char *s1, *s2;
+
+        s1 = *(char * const *)a;
+        s2 = *(char * const *)b;
+        return strcmp(file_name_from_path(s1), file_name_from_path(s2));
+}
+
+int conf_files_list_strv(char ***strv, const char *suffix, const char **dirs) {
+        Hashmap *fh = NULL;
+        char **files = NULL;
+        const char **p;
+        int r = 0;
+
+        assert(dirs);
+
+        fh = hashmap_new(string_hash_func, string_compare_func);
+        if (!fh) {
+                r = -ENOMEM;
+                goto finish;
+        }
+
+        STRV_FOREACH(p, dirs) {
+                if (files_add(fh, *p, suffix) < 0) {
+                        log_error("Failed to search for files.");
+                        r = -EINVAL;
+                        goto finish;
+                }
+        }
+
+        files = hashmap_get_strv(fh);
+        if (files == NULL) {
+                log_error("Failed to compose list of files.");
+                r = -ENOMEM;
+                goto finish;
+        }
+        qsort(files, hashmap_size(fh), sizeof(char *), base_cmp);
+
+finish:
+        hashmap_free(fh);
+        *strv = files;
+        return r;
+}
+
+int conf_files_list(char ***strv, const char *suffix, const char *dir, ...) {
+        char **dirs = NULL;
+        va_list ap;
+        int r;
+
+        va_start(ap, dir);
+        dirs = strv_new_ap(dir, ap);
+        va_end(ap);
+        if (!dirs) {
+                r = -ENOMEM;
+                goto finish;
+        }
+
+        if (!strv_path_canonicalize(dirs)) {
+                r = -ENOMEM;
+                goto finish;
+        }
+        strv_uniq(dirs);
+
+        r = conf_files_list_strv(strv, suffix, (const char **)dirs);
+
+finish:
+        strv_free(dirs);
+        return r;
+}