abrt-handle-crashdump: add -l[pfx] option to list possible events

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>

3 files changed, 84 insertions, 7 deletions

diff --git a/lib/utils/parse_options.c b/lib/utils/parse_options.c
index 7029643f..c1a2c297 100644
--- a/lib/utils/parse_options.c
+++ b/lib/utils/parse_options.c
@@ -37,7 +37,12 @@ void parse_usage_and_die(const char *usage, const struct options *opt)
             pos += fprintf(stderr, "--%s", opt->long_name);
 
         if (opt->argh)
-            pos += fprintf(stderr, " %s", opt->argh);
+        {
+            const char *fmt = " %s";
+            if (opt->type == OPTION_OPTSTRING)
+                fmt = "[%s]";
+            pos += fprintf(stderr, fmt, opt->argh);
+        }
 
         if (pos <= USAGE_OPTS_WIDTH)
             pad = USAGE_OPTS_WIDTH - pos;
@@ -91,6 +96,11 @@ unsigned parse_opts(int argc, char **argv, const struct options *opt,
                 if (opt[ii].short_name)
                     strbuf_append_strf(shortopts, "%c:", opt[ii].short_name);
                 break;
+            case OPTION_OPTSTRING:
+                curopt->has_arg = optional_argument;
+                if (opt[ii].short_name)
+                    strbuf_append_strf(shortopts, "%c::", opt[ii].short_name);
+                break;
             case OPTION_GROUP:
             case OPTION_END:
                 break;
@@ -153,6 +163,7 @@ unsigned parse_opts(int argc, char **argv, const struct options *opt,
                         *(int*)opt[ii].value = xatoi(optarg);
                         break;
                     case OPTION_STRING:
+                    case OPTION_OPTSTRING:
                         if (optarg)
                             *(char**)opt[ii].value = (char*)optarg;
                         break;
diff --git a/lib/utils/parse_options.h b/lib/utils/parse_options.h
index f44f29b1..105f081c 100644
--- a/lib/utils/parse_options.h
+++ b/lib/utils/parse_options.h
@@ -12,6 +12,7 @@ enum parse_opt_type {
     OPTION_GROUP,
     OPTION_STRING,
     OPTION_INTEGER,
+    OPTION_OPTSTRING,
     OPTION_END,
 };
 
@@ -31,11 +32,12 @@ struct options {
  * a - argh argument help
  * h - help
  */
-#define OPT_END()                   { OPTION_END }
-#define OPT_BOOL(s, l, v, h)        { OPTION_BOOL, (s), (l), (v), NULL, (h) }
-#define OPT_GROUP(h)                { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
-#define OPT_INTEGER(s, l, v, h)     { OPTION_INTEGER, (s), (l), (v), "n", (h) }
-#define OPT_STRING(s, l, v, a, h)   { OPTION_STRING, (s), (l), (v), (a), (h) }
+#define OPT_END()                    { OPTION_END }
+#define OPT_BOOL(s, l, v, h)         { OPTION_BOOL, (s), (l), (v), NULL, (h) }
+#define OPT_GROUP(h)                 { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
+#define OPT_INTEGER(s, l, v, h)      { OPTION_INTEGER, (s), (l), (v), "n", (h) }
+#define OPT_STRING(s, l, v, a, h)    { OPTION_STRING, (s), (l), (v), (a), (h) }
+#define OPT_OPTSTRING(s, l, v, a, h) { OPTION_OPTSTRING, (s), (l), (v), (a), (h) }
 
 #define OPT__VERBOSE(v)     OPT_BOOL('v', "verbose", (v), "be verbose")
 
diff --git a/lib/utils/run_event.c b/lib/utils/run_event.c
index 9c4584a8..f8ad443e 100644
--- a/lib/utils/run_event.c
+++ b/lib/utils/run_event.c
@@ -51,7 +51,7 @@ int run_event(struct run_event_state *state,
         if (*p == '\0' || *p == '#')
             goto next_line; /* empty or comment line, skip */
 
-        VERB3 log("line '%s'", p);
+        VERB3 log("%s: line '%s'", __func__, p);
 
         while (1) /* word loop */
         {
@@ -166,3 +166,67 @@ int run_event(struct run_event_state *state,
 
     return retval;
 }
+
+char *list_possible_events(const char *pfx)
+{
+    FILE *conffile = fopen(CONF_DIR"/abrt_action.conf", "r");
+    if (!conffile)
+    {
+        error_msg("Can't open '%s'", CONF_DIR"/abrt_action.conf");
+        return NULL;
+    }
+
+    unsigned pfx_len = strlen(pfx);
+    struct strbuf *result = strbuf_new();
+    char *line;
+    while ((line = xmalloc_fgetline(conffile)) != NULL)
+    {
+        /* Line has form: [VAR=VAL]... PROG [ARGS] */
+        char *p = skip_whitespace(line);
+        if (*p == '\0' || *p == '#')
+            goto next_line; /* empty or comment line, skip */
+
+        VERB3 log("%s: line '%s'", __func__, p);
+
+        while (1) /* word loop */
+        {
+            /* If there is no '=' in this word... */
+            char *end_of_word = skip_non_whitespace(p);
+            char *next_word = skip_whitespace(end_of_word);
+            char *val = strchr(p, '=');
+            if (!val || val >= next_word)
+                break; /* ...we found the start of a command */
+
+            /* Current word has VAR=VAL form */
+            *val++ = '\0';
+            if (strcmp(p, "EVENT") == 0)
+            {
+                /* EVENT=VAL */
+                *end_of_word = '\0';
+                if (strncmp(pfx, val, pfx_len) == 0)
+                {
+                    /* VAL starts with pfx */
+                    unsigned val_len_p2 = sprintf(line, "\n%s\n", val);  /* line = "\nVAL\n" */
+
+                    /* Do we already have VAL in the result? */
+                    if (!strstr(result->buf, line)
+                     && strncmp(result->buf, line + 1, val_len_p2 - 1) != 0
+                    ) {
+                        /* No, add VAL\n */
+                        strbuf_append_str(result, line + 1);
+                    }
+                }
+                /* We don't check for more EVENT=foo words on the line */
+                break;
+            }
+
+            p = next_word;
+        } /* end of word loop */
+
+ next_line:
+        free(line);
+    } /* end of line loop */
+    fclose(conffile);
+
+    return strbuf_free_nobuf(result);
+}