[lvm-devel] [PATCH 2/3] Add find_config_tree_str_allow_empty
Zdenek Kabelac
zkabelac at redhat.com
Thu Oct 6 09:43:01 UTC 2011
Add function to allow read of empty strings as valid arguments.
Add a warning message if string argument has ignored value.
Signed-off-by: Zdenek Kabelac <zkabelac at redhat.com>
---
lib/commands/toolcontext.c | 7 ++++---
lib/config/config.c | 6 ++++++
lib/config/config.h | 2 ++
libdm/libdevmapper.h | 2 ++
libdm/libdm-config.c | 19 ++++++++++++++-----
5 files changed, 28 insertions(+), 8 deletions(-)
diff --git a/lib/commands/toolcontext.c b/lib/commands/toolcontext.c
index 6c554b2..5ab2c83 100644
--- a/lib/commands/toolcontext.c
+++ b/lib/commands/toolcontext.c
@@ -127,6 +127,7 @@ static void _init_logging(struct cmd_context *cmd)
const char *log_file;
char timebuf[26];
+ const struct dm_config_node *cn;
/* Syslog */
cmd->default_settings.syslog =
@@ -153,9 +154,9 @@ static void _init_logging(struct cmd_context *cmd)
init_abort_on_internal_errors(find_config_tree_int(cmd, "global/abort_on_internal_errors",
DEFAULT_ABORT_ON_INTERNAL_ERRORS));
- cmd->default_settings.msg_prefix = find_config_tree_str(cmd,
- "log/prefix",
- DEFAULT_MSG_PREFIX);
+ cmd->default_settings.msg_prefix =
+ find_config_tree_str_allow_empty(cmd, "log/prefix", DEFAULT_MSG_PREFIX);
+
init_msg_prefix(cmd->default_settings.msg_prefix);
cmd->default_settings.cmd_name = find_config_tree_int(cmd,
diff --git a/lib/config/config.c b/lib/config/config.c
index c62e959..d82fee4 100644
--- a/lib/config/config.c
+++ b/lib/config/config.c
@@ -182,6 +182,12 @@ const char *find_config_tree_str(struct cmd_context *cmd,
return dm_config_tree_find_str(cmd->cft, path, fail);
}
+const char *find_config_tree_str_allow_empty(struct cmd_context *cmd,
+ const char *path, const char *fail)
+{
+ return dm_config_tree_find_str_allow_empty(cmd->cft, path, fail);
+}
+
int find_config_tree_int(struct cmd_context *cmd, const char *path,
int fail)
{
diff --git a/lib/config/config.h b/lib/config/config.h
index 5edc6cc..dd6daeb 100644
--- a/lib/config/config.h
+++ b/lib/config/config.h
@@ -44,6 +44,8 @@ const struct dm_config_node *find_config_tree_node(struct cmd_context *cmd,
const char *path);
const char *find_config_tree_str(struct cmd_context *cmd,
const char *path, const char *fail);
+const char *find_config_tree_str_allow_empty(struct cmd_context *cmd,
+ const char *path, const char *fail);
int find_config_tree_int(struct cmd_context *cmd, const char *path,
int fail);
int64_t find_config_tree_int64(struct cmd_context *cmd, const char *path,
diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h
index 223a0fe..84b586b 100644
--- a/libdm/libdevmapper.h
+++ b/libdm/libdevmapper.h
@@ -1350,6 +1350,8 @@ float dm_config_find_float(const struct dm_config_node *cn, const char *path, fl
const struct dm_config_node *dm_config_tree_find_node(const struct dm_config_tree *cft, const char *path);
const char *dm_config_tree_find_str(const struct dm_config_tree *cft,
const char *path, const char *fail);
+const char *dm_config_tree_find_str_allow_empty(const struct dm_config_tree *cft,
+ const char *path, const char *fail);
int dm_config_tree_find_int(const struct dm_config_tree *cft,
const char *path, int fail);
int64_t dm_config_tree_find_int64(const struct dm_config_tree *cft,
diff --git a/libdm/libdm-config.c b/libdm/libdm-config.c
index b9ce7a3..3ece3d3 100644
--- a/libdm/libdm-config.c
+++ b/libdm/libdm-config.c
@@ -923,15 +923,18 @@ static const struct dm_config_node *_find_first_config_node(const void *start, c
}
static const char *_find_config_str(const void *start, node_lookup_fn find_fn,
- const char *path, const char *fail)
+ const char *path, const char *fail, int allow_empty)
{
const struct dm_config_node *n = find_fn(start, path);
/* Empty strings are ignored */
- if ((n && n->v && n->v->type == DM_CFG_STRING) && (*n->v->v.str)) {
+ if ((n && n->v && n->v->type == DM_CFG_STRING) &&
+ (allow_empty || (*n->v->v.str))) {
log_very_verbose("Setting %s to %s", path, n->v->v.str);
return n->v->v.str;
- }
+ } else if (n && (!n->v || (n->v->type != DM_CFG_STRING) ||
+ (!allow_empty && fail)))
+ log_warn("WARNING: Ignoring unsupported value for %s.", path);
if (fail)
log_very_verbose("%s not found in config: defaulting to %s",
@@ -942,7 +945,7 @@ static const char *_find_config_str(const void *start, node_lookup_fn find_fn,
const char *dm_config_find_str(const struct dm_config_node *cn,
const char *path, const char *fail)
{
- return _find_config_str(cn, _find_config_node, path, fail);
+ return _find_config_str(cn, _find_config_node, path, fail, 0);
}
static int64_t _find_config_int64(const void *start, node_lookup_fn find,
@@ -1064,7 +1067,13 @@ const struct dm_config_node *dm_config_tree_find_node(const struct dm_config_tre
const char *dm_config_tree_find_str(const struct dm_config_tree *cft, const char *path,
const char *fail)
{
- return _find_config_str(cft, _find_first_config_node, path, fail);
+ return _find_config_str(cft, _find_first_config_node, path, fail, 0);
+}
+
+const char *dm_config_tree_find_str_allow_empty(const struct dm_config_tree *cft, const char *path,
+ const char *fail)
+{
+ return _find_config_str(cft, _find_first_config_node, path, fail, 1);
}
int dm_config_tree_find_int(const struct dm_config_tree *cft, const char *path, int fail)
--
1.7.6.4
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