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 <dirent.h>
  23 #include <errno.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include "conf-files.h"
  29 #include "dirent-util.h"
  30 #include "fd-util.h"
  31 #include "hashmap.h"
  32 #include "log.h"
  33 #include "macro.h"
  34 #include "missing.h"
  35 #include "path-util.h"
  36 #include "string-util.h"
  37 #include "strv.h"
  38 #include "util.h"
  39
  40 static int files_add(Hashmap *h, const char *root, const char *path, const char *suffix) {
  41         _cleanup_closedir_ DIR *dir = NULL;
  42         const char *dirpath;
  43         int r;
  44
  45         assert(path);
  46         assert(suffix);
  47
  48         dirpath = prefix_roota(root, path);
  49
  50         dir = opendir(dirpath);
  51         if (!dir) {
  52                 if (errno == ENOENT)
  53                         return 0;
  54                 return -errno;
  55         }
  56
  57         for (;;) {
  58                 struct dirent *de;
  59                 char *p;
  60
  61                 errno = 0;
  62                 de = readdir(dir);
  63                 if (!de && errno != 0)
  64                         return -errno;
  65
  66                 if (!de)
  67                         break;
  68
  69                 if (!dirent_is_file_with_suffix(de, suffix))
  70                         continue;
  71
  72                 p = strjoin(dirpath, "/", de->d_name, NULL);
  73                 if (!p)
  74                         return -ENOMEM;
  75
  76                 r = hashmap_put(h, basename(p), p);
  77                 if (r == -EEXIST) {
  78                         log_debug("Skipping overridden file: %s.", p);
  79                         free(p);
  80                 } else if (r < 0) {
  81                         free(p);
  82                         return r;
  83                 } else if (r == 0) {
  84                         log_debug("Duplicate file %s", p);
  85                         free(p);
  86                 }
  87         }
  88
  89         return 0;
  90 }
  91
  92 static int base_cmp(const void *a, const void *b) {
  93         const char *s1, *s2;
  94
  95         s1 = *(char * const *)a;
  96         s2 = *(char * const *)b;
  97         return strcmp(basename(s1), basename(s2));
  98 }
  99
 100 static int conf_files_list_strv_internal(char ***strv, const char *suffix, const char *root, char **dirs) {
 101         _cleanup_hashmap_free_ Hashmap *fh = NULL;
 102         char **files, **p;
 103         int r;
 104
 105         assert(strv);
 106         assert(suffix);
 107
 108         /* This alters the dirs string array */
 109         if (!path_strv_resolve_uniq(dirs, root))
 110                 return -ENOMEM;
 111
 112         fh = hashmap_new(&string_hash_ops);
 113         if (!fh)
 114                 return -ENOMEM;
 115
 116         STRV_FOREACH(p, dirs) {
 117                 r = files_add(fh, root, *p, suffix);
 118                 if (r == -ENOMEM) {
 119                         return r;
 120                 } else if (r < 0)
 121                         log_debug_errno(r, "Failed to search for files in %s: %m",
 122                                         *p);
 123         }
 124
 125         files = hashmap_get_strv(fh);
 126         if (files == NULL) {
 127                 return -ENOMEM;
 128         }
 129
 130         qsort_safe(files, hashmap_size(fh), sizeof(char *), base_cmp);
 131         *strv = files;
 132
 133         return 0;
 134 }
 135
 136 int conf_files_list_strv(char ***strv, const char *suffix, const char *root, const char* const* dirs) {
 137         _cleanup_strv_free_ char **copy = NULL;
 138
 139         assert(strv);
 140         assert(suffix);
 141
 142         copy = strv_copy((char**) dirs);
 143         if (!copy)
 144                 return -ENOMEM;
 145
 146         return conf_files_list_strv_internal(strv, suffix, root, copy);
 147 }
 148
 149 int conf_files_list(char ***strv, const char *suffix, const char *root, const char *dir, ...) {
 150         _cleanup_strv_free_ char **dirs = NULL;
 151         va_list ap;
 152
 153         assert(strv);
 154         assert(suffix);
 155
 156         va_start(ap, dir);
 157         dirs = strv_new_ap(dir, ap);
 158         va_end(ap);
 159
 160         if (!dirs)
 161                 return -ENOMEM;
 162
 163         return conf_files_list_strv_internal(strv, suffix, root, dirs);
 164 }
 165
 166 int conf_files_list_nulstr(char ***strv, const char *suffix, const char *root, const char *d) {
 167         _cleanup_strv_free_ char **dirs = NULL;
 168
 169         assert(strv);
 170         assert(suffix);
 171
 172         dirs = strv_split_nulstr(d);
 173         if (!dirs)
 174                 return -ENOMEM;
 175
 176         return conf_files_list_strv_internal(strv, suffix, root, dirs);
 177 }