*/
#include "mdctl.h"
-
+#include "dlink.h"
+#include <glob.h>
/*
* Read the config file
*
* Each keeps the returned list and frees it when asked to make
* a new list.
*
+ * The format of the config file needs to be fairly extensible.
+ * Now, arrays only have names and uuids and devices merely are.
+ * But later arrays might want names, and devices might want superblock
+ * versions, and who knows what else.
+ * I like free format, abhore backslash line continuation, adore
+ * indentation for structure and am ok about # comments.
+ *
+ * So, each line that isn't blank or a #comment must either start
+ * with a key word, and not be indented, or must start with a
+ * non-key-word and must be indented.
+ *
+ * Keywords are DEVICE and ARRAY
+ * DEV{ICE} introduces some devices that might contain raid components.
+ * e.g.
+ * DEV style=0 /dev/sda* /dev/hd*
+ * DEV style=1 /dev/sd[b-f]*
+ * ARR{AY} describes an array giving md device and attributes like uuid=whatever
+ * e.g.
+ * ARRAY /dev/md0 uuid=whatever name=something
+ * Spaces separate words on each line. Quoting, with "" or '' protects them,
+ * but may not wrap over lines
+ *
*/
char DefaultConfFile[] = "/etc/mdctl.conf";
+char *keywords[] = { "device", "array", NULL };
+
+/*
+ * match_keyword returns an index into the keywords array, or -1 for no match
+ * case is ignored, and at least three characters must be given
+ */
+
+int match_keyword(char *word)
+{
+ int len = strlen(word);
+ int n;
+
+ if (len < 3) return -1;
+ for (n=0; keywords[n]; n++) {
+ if (strncasecmp(word, keywords[n], len)==0)
+ return n;
+ }
+ return -1;
+}
+
+/* conf_word gets one word from the conf file.
+ * if "allow_key", then accept words at the start of a line,
+ * otherwise stop when such a word is found.
+ * We assume that the file pointer is at the end of a word, so the
+ * next character is a space, or a newline. If not, it is the start of a line.
+ */
+
+char *conf_word(FILE *file, int allow_key)
+{
+ int wsize = 100;
+ int len = 0;
+ int c;
+ int quote;
+ int wordfound = 0;
+ char *word = malloc(wsize);
+
+ if (!word) abort();
+
+ while (wordfound==0) {
+ /* at the end of a word.. */
+ c = getc(file);
+ if (c == '#')
+ while (c != EOF && c != '\n')
+ c = getc(file);
+ if (c == EOF) break;
+ if (c == '\n') continue;
+
+ if (c != ' ' && c != '\t' && ! allow_key) {
+ ungetc(c, file);
+ break;
+ }
+ /* looks like it is safe to get a word here, if there is one */
+ quote = 0;
+ /* first, skip any spaces */
+ while (c == ' ' || c == '\t')
+ c = getc(file);
+ if (c != EOF && c != '\n' && c != '#') {
+ /* we really have a character of a word, so start saving it */
+ while (c != EOF && c != '\n' && (quote || (c!=' ' && c != '\t'))) {
+ wordfound = 1;
+ if (quote && c == quote) quote = 0;
+ else if (quote == 0 && (c == '\'' || c == '"'))
+ quote = c;
+ else {
+ if (len == wsize-1) {
+ wsize += 100;
+ word = realloc(word, wsize);
+ if (!word) abort();
+ }
+ word[len++] = c;
+ }
+ c = getc(file);
+ }
+ }
+ if (c != EOF) ungetc(c, file);
+ }
+ word[len] = 0;
+/* printf("word is <%s>\n", word); */
+ if (!wordfound) {
+ free(word);
+ word = NULL;
+ }
+ return word;
+}
+
+/*
+ * conf_line reads one logical line from the conffile.
+ * It skips comments and continues until it finds a line that starts
+ * with a non blank/comment. This character is pushed back for the next call
+ * A doubly linked list of words is returned.
+ * the first word will be a keyword. Other words will have had quotes removed.
+ */
+
+char *conf_line(FILE *file)
+{
+ char *w;
+ char *list;
+
+ w = conf_word(file, 1);
+ if (w == NULL) return NULL;
+
+ list = dl_strdup(w);
+ free(w);
+ dl_init(list);
+
+ while ((w = conf_word(file,0))){
+ char *w2 = dl_strdup(w);
+ free(w);
+ dl_add(list, w2);
+ }
+/* printf("got a line\n");*/
+ return list;
+}
+
+void free_line(char *line)
+{
+ char *w;
+ for (w=dl_next(line); w != line; w=dl_next(line)) {
+ dl_del(w);
+ dl_free(w);
+ }
+ dl_free(line);
+}
+
+
+struct conf_dev {
+ struct conf_dev *next;
+ char *name;
+} *cdevlist = NULL;
+
+
+
+int devline(char *line)
+{
+ char *w;
+ struct conf_dev *cd;
+
+ for (w=dl_next(line); w != line; w=dl_next(w)) {
+ if (w[0] == '/') {
+ cd = malloc(sizeof(*cd));
+ cd->name = strdup(w);
+ cd->next = cdevlist;
+ cdevlist = cd;
+ } else {
+ fprintf(stderr, Name ": unreconised word on DEVICE line: %s\n",
+ w);
+ }
+ }
+}
+
+mddev_uuid_t uuidlist = NULL;
+
+void arrayline(char *line)
+{
+ char *w;
+ char *dev = NULL;
+ __u32 uuid[4];
+ int uidset=0;
+ mddev_uuid_t mu;
+
+ for (w=dl_next(line); w!=line; w=dl_next(w)) {
+ if (w[0] == '/') {
+ if (dev)
+ fprintf(stderr, Name ": only give one device per ARRAY line: %s and %s\n",
+ dev, w);
+ else dev = w;
+ } else if (strncasecmp(w, "uuid=", 5)==0 ) {
+ if (uidset)
+ fprintf(stderr, Name ": only specify uuid once, %s ignored.\n",
+ w);
+ else {
+ if (parse_uuid(w+5, uuid))
+ uidset = 1;
+ else
+ fprintf(stderr, Name ": bad uuid: %s\n", w);
+ }
+ } else {
+ fprintf(stderr, Name ": unrecognised word on ARRAY line: %s\n",
+ w);
+ }
+ }
+ if (dev == NULL)
+ fprintf(stderr, Name ": ARRAY line with a device\n");
+ else if (uidset == 0)
+ fprintf(stderr, Name ": ARRAY line %s has no uuid\n", dev);
+ else {
+ mu = malloc(sizeof(*mu));
+ mu->devname = strdup(dev);
+ memcpy(mu->uuid, uuid, sizeof(uuid));
+ mu->next = uuidlist;
+ uuidlist = mu;
+ }
+}
+
+int loaded = 0;
+
+void load_conffile(char *conffile)
+{
+ FILE *f;
+ char *line;
+
+ if (loaded) return;
+ if (conffile == NULL)
+ conffile = DefaultConfFile;
+
+ f = fopen(conffile, "r");
+ if (f ==NULL)
+ return;
+
+ loaded = 1;
+ while ((line=conf_line(f))) {
+ switch(match_keyword(line)) {
+ case 0: /* DEVICE */
+ devline(line);
+ break;
+ case 1:
+ arrayline(line);
+ break;
+ default:
+ fprintf(stderr, Name ": Unknown keyword %s\n", line);
+ }
+ free_line(line);
+ }
+
+
+/* printf("got file\n"); */
+}
+
+
mddev_uuid_t conf_get_uuids(char *conffile)
{
- return NULL;
+ load_conffile(conffile);
+ return uuidlist;
}
mddev_dev_t conf_get_devs(char *conffile)
{
- return NULL;
+ glob_t globbuf;
+ struct conf_dev *cd;
+ int flags = 0;
+ static mddev_dev_t dlist = NULL;
+ int i;
+
+ while (dlist) {
+ mddev_dev_t t = dlist;
+ dlist = dlist->next;
+ free(t->devname);
+ free(t);
+ }
+
+ load_conffile(conffile);
+
+ for (cd=cdevlist; cd; cd=cd->next) {
+ glob(cd->name, flags, NULL, &globbuf);
+ flags |= GLOB_APPEND;
+ }
+
+ for (i=0; i<globbuf.gl_pathc; i++) {
+ mddev_dev_t t = malloc(sizeof(*t));
+ t->devname = strdup(globbuf.gl_pathv[i]);
+ t->next = dlist;
+ dlist = t;
+/* printf("one dev is %s\n", t->devname);*/
+ }
+ globfree(&globbuf);
+
+
+ return dlist;
}
projects / thirdparty / mdadm.git / blobdiff