mdctl-v0.4mdctl-v0.4

1 files changed, 286 insertions, 3 deletions

diff --git a/config.c b/config.c
index b4d235cc..4437de7b 100644
--- a/config.c
+++ b/config.c
@@ -28,7 +28,8 @@
  */
 
 #include	"mdctl.h"
-
+#include	"dlink.h"
+#include	<glob.h>
 /*
  * Read the config file
  *
@@ -38,17 +39,299 @@
  * 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;
 }