Re: [Libguestfs] [PATCH 1/2] New API: btrfs_balance_status

+ lines = split_lines (out); + if (!lines) + return NULL; + + ret = malloc(sizeof *ret); + if (ret == NULL) { + reply_with_perror ("malloc"); + goto error; + } + memset (ret, 0, sizeof(*ret)); + + /* Output of `btrfs balance status' is like: + * + * running: + * + * Balance on '/' is running + * 3 out of about 8 chunks balanced (3 considered), 62% left + * + * paused: + * + * Balance on '/' is paused + * 3 out of about 8 chunks balanced (3 considered), 62% left + * + * no balance running: + * + * No Balance found on '/' + * + */ + if (strstr (lines[0], "No balance found on")) {

+ ret->btrfsbalance_status = strdup("none");

+ return ret; + } + + re = pcre_compile ("Balance on '.*' is (.*)", 0, &errptr, &erroffset, NULL); + if (re == NULL) { + reply_with_error ("pcre_compile (%i): %s", erroffset, errptr); + goto error; + } + if (pcre_exec (re, NULL, lines[0], strlen (lines[0]), 0, 0, + ovector, N_MATCH * 3) < 0) { + reply_with_error ("unexpected output from 'btrfs balance status' command: %s", lines[0]); + goto error; + } +#undef N_MATCH + + if (STREQ (lines[0] + ovector[2], "running")) + ret->btrfsbalance_status = strdup("running"); + else if (STREQ (lines[0] + ovector[2], "paused")) + ret->btrfsbalance_status = strdup("paused"); + else { + reply_with_error ("unexpected output from 'btrfs balance status' command: %s", lines[0]); + goto error; + } + + if (sscanf (lines[1], "%" SCNu64 " out of about %" SCNu64 + " chunks balanced (%" SCNu64 " considered), %" SCNu64 "%% left", + &ret->btrfsbalance_balanced, &ret->btrfsbalance_total, + &ret->btrfsbalance_considered, &ret->btrfsbalance_left) != 4) { + reply_with_perror ("sscanf"); + goto error; + } + + pcre_free (re); + return ret; + +error: + free (ret->btrfsbalance_status); + free (ret); + pcre_free (re); + + return NULL;