Parses files from /etc/depmod.alternatives which specify pairs of
(module directory, config file).
Signed-off-by: Keegan McAllister <keegan@xxxxxxxxxxx>
---
depmod.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 96 insertions(+), 0 deletions(-)
diff --git a/depmod.c b/depmod.c
index d9652b3..14da871 100644
--- a/depmod.c
+++ b/depmod.c
@@ -1368,6 +1368,99 @@ struct config_alternative
char *config_file;
};
+static void parse_alternative(const char *filename,
+ struct config_alternative **alts)
+{
+ char *line;
+ unsigned int linenum = 0;
+ FILE *cfile;
+ struct config_alternative *alt;
+ char *module_dir = NULL, *config_file = NULL;
+
+ cfile = fopen(filename, "r");
+ if (!cfile) {
+ if (errno != ENOENT)
+ fatal("could not open '%s', reason: %s\n", filename,
+ strerror(errno));
+ else if (verbose)
+ warn("config file does not actually exist "
+ "(broken symlink?): %s\n", filename);
+ return;
+ }
+
+ while ((line = getline_wrapped(cfile, &linenum)) != NULL) {
+ char *ptr = line;
+ char *cmd, *tmp;
+
+ cmd = strsep_skipspace(&ptr, "\t ");
+
+ if (cmd == NULL || cmd[0] == '#' || cmd[0] == '\0') {
+ free(line);
+ continue;
+ }
+
+ if (streq(cmd, "moduledir")) {
+ tmp = strsep_skipspace(&ptr, "\t ");
+ if (!tmp || module_dir)
+ goto bad_file;
+ module_dir = NOFAIL(strdup(tmp));
+ } else if (streq(cmd, "config")) {
+ tmp = strsep_skipspace(&ptr, "\t ");
+ if (!tmp || config_file)
+ goto bad_file;
+ config_file = NOFAIL(strdup(tmp));
+ } else {
+ goto bad_file;
+ }
+
+ free(line);
+ }
+
+ fclose(cfile);
+
+ if (!module_dir)
+ goto bad_file;
+
+ alt = NOFAIL(malloc(sizeof(*alt)));
+ alt->module_dir = module_dir;
+ alt->config_file = config_file;
+
+ alt->next = *alts;
+ *alts = alt;
+ return;
+
+bad_file:
+ warn("%s line %u: malformed alternatives file\n", filename, linenum);
+ /* These may be NULL, but free(NULL) is fine. */
+ free(module_dir);
+ free(config_file);
+ free(line);
+}
+
+static void parse_alternatives_dir(const char *dirname,
+ struct config_alternative **alts)
+{
+ LIST_HEAD(files_list);
+ if (read_config_dir(dirname, &files_list)) {
+ struct file_entry *fe, *fe_tmp;
+
+ /* parse list of files */
+ list_for_each_entry_safe(fe, fe_tmp, &files_list, node) {
+ char *cfgfile;
+
+ nofail_asprintf(&cfgfile, "%s/%s", dirname, fe->name);
+ parse_alternative(cfgfile, alts);
+ free(cfgfile);
+ list_del(&fe->node);
+ free(fe);
+ }
+ } else {
+ if (verbose)
+ warn("Failed to open alternatives directory "
+ "%s: %s\n", dirname, strerror(errno));
+ }
+}
+
static void do_alternative(struct config_alternative *alt,
const char *basedir, const char *version,
int argc, char *argv[])
@@ -1572,6 +1665,9 @@ int main(int argc, char *argv[])
alts->module_dir = NOFAIL(strdup(MODULE_DIR));
alts->config_file = config ? NOFAIL(strdup(config)) : NULL;
+ /* Read more alternatives from a directory, if present. */
+ parse_alternatives_dir("/etc/depmod.alternatives", &alts);
+
/* Process each alternative */
for (alt = alts; alt; alt = alt->next)
do_alternative(alt, basedir, version, argc, argv);
--
1.7.2.3
--
To unsubscribe from this list: send the line "unsubscribe linux-modules" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
