src/basic/conf-files.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <string.h>
  23 #include <errno.h>
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <dirent.h>
  27
  28 #include "macro.h"
  29 #include "util.h"
  30 #include "missing.h"
  31 #include "log.h"
  32 #include "strv.h"
  33 #include "path-util.h"
  34 #include "hashmap.h"
  35 #include "conf-files.h"
  36
  37 static int files_add(Hashmap *h, const char *root, const char *path, const char *suffix) {
  38         _cleanup_closedir_ DIR *dir = NULL;
  39         const char *dirpath;
  40         int r;
  41
  42         assert(path);
  43         assert(suffix);
  44
  45         dirpath = prefix_roota(root, path);
  46
  47         dir = opendir(dirpath);
  48         if (!dir) {
  49                 if (errno == ENOENT)
  50                         return 0;
  51                 return -errno;
  52         }
  53
  54         for (;;) {
  55                 struct dirent *de;
  56                 char *p;
  57
  58                 errno = 0;
  59                 de = readdir(dir);
  60                 if (!de && errno != 0)
  61                         return -errno;
  62
  63                 if (!de)
  64                         break;
  65
  66                 if (!dirent_is_file_with_suffix(de, suffix))
  67                         continue;
  68
  69                 p = strjoin(dirpath, "/", de->d_name, NULL);
  70                 if (!p)
  71                         return -ENOMEM;
  72
  73                 r = hashmap_put(h, basename(p), p);
  74                 if (r == -EEXIST) {
  75                         log_debug("Skipping overridden file: %s.", p);
  76                         free(p);
  77                 } else if (r < 0) {
  78                         free(p);
  79                         return r;
  80                 } else if (r == 0) {
  81                         log_debug("Duplicate file %s", p);
  82                         free(p);
  83                 }
  84         }
  85
  86         return 0;
  87 }
  88
  89 static int base_cmp(const void *a, const void *b) {
  90         const char *s1, *s2;
  91
  92         s1 = *(char * const *)a;
  93         s2 = *(char * const *)b;
  94         return strcmp(basename(s1), basename(s2));
  95 }
  96
  97 static int conf_files_list_strv_internal(char ***strv, const char *suffix, const char *root, char **dirs) {
  98         _cleanup_hashmap_free_ Hashmap *fh = NULL;
  99         char **files, **p;
 100         int r;
 101
 102         assert(strv);
 103         assert(suffix);
 104
 105         /* This alters the dirs string array */
 106         if (!path_strv_resolve_uniq(dirs, root))
 107                 return -ENOMEM;
 108
 109         fh = hashmap_new(&string_hash_ops);
 110         if (!fh)
 111                 return -ENOMEM;
 112
 113         STRV_FOREACH(p, dirs) {
 114                 r = files_add(fh, root, *p, suffix);
 115                 if (r == -ENOMEM) {
 116                         return r;
 117                 } else if (r < 0)
 118                         log_debug_errno(r, "Failed to search for files in %s: %m",
 119                                         *p);
 120         }
 121
 122         files = hashmap_get_strv(fh);
 123         if (files == NULL) {
 124                 return -ENOMEM;
 125         }
 126
 127         qsort_safe(files, hashmap_size(fh), sizeof(char *), base_cmp);
 128         *strv = files;
 129
 130         return 0;
 131 }
 132
 133 int conf_files_list_strv(char ***strv, const char *suffix, const char *root, const char* const* dirs) {
 134         _cleanup_strv_free_ char **copy = NULL;
 135
 136         assert(strv);
 137         assert(suffix);
 138
 139         copy = strv_copy((char**) dirs);
 140         if (!copy)
 141                 return -ENOMEM;
 142
 143         return conf_files_list_strv_internal(strv, suffix, root, copy);
 144 }
 145
 146 int conf_files_list(char ***strv, const char *suffix, const char *root, const char *dir, ...) {
 147         _cleanup_strv_free_ char **dirs = NULL;
 148         va_list ap;
 149
 150         assert(strv);
 151         assert(suffix);
 152
 153         va_start(ap, dir);
 154         dirs = strv_new_ap(dir, ap);
 155         va_end(ap);
 156
 157         if (!dirs)
 158                 return -ENOMEM;
 159
 160         return conf_files_list_strv_internal(strv, suffix, root, dirs);
 161 }
 162
 163 int conf_files_list_nulstr(char ***strv, const char *suffix, const char *root, const char *d) {
 164         _cleanup_strv_free_ char **dirs = NULL;
 165
 166         assert(strv);
 167         assert(suffix);
 168
 169         dirs = strv_split_nulstr(d);
 170         if (!dirs)
 171                 return -ENOMEM;
 172
 173         return conf_files_list_strv_internal(strv, suffix, root, dirs);
 174 }