[v2,2/4] nfs-utils: Enable the retrieval of raw config settings without
diff mbox series

Message ID fcf1bebd43476c9d08cf03a38daa4aa58e882dba.camel@redhat.com
State New
Headers show
Series
  • nfs-utils: nfs.conf features to enable use of machine-id as nfs4_unique_id
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Commit Message

Alice Mitchell July 16, 2020, 1:54 p.m. UTC
Config entries sometimes contain variable expansions, this adds options
to retrieve the config entry rather than its current expanded value.

Signed-off-by: Alice Mitchell <ajmitchell@redhat.com>
---
 support/include/conffile.h |  1 +
 support/nfs/conffile.c     | 23 +++++++++++++++++++++++
 tools/nfsconf/nfsconf.man  | 17 +++++++++++++----
 tools/nfsconf/nfsconfcli.c | 22 ++++++++++++++++------
 4 files changed, 53 insertions(+), 10 deletions(-)

Patch
diff mbox series

diff --git a/support/include/conffile.h b/support/include/conffile.h
index 7d974fe9..c4a3ca62 100644
--- a/support/include/conffile.h
+++ b/support/include/conffile.h
@@ -61,6 +61,7 @@  extern _Bool    conf_get_bool(const char *, const char *, _Bool);
 extern char    *conf_get_str(const char *, const char *);
 extern char    *conf_get_str_with_def(const char *, const char *, char *);
 extern char    *conf_get_section(const char *, const char *, const char *);
+extern char    *conf_get_entry(const char *, const char *, const char *);
 extern int      conf_init_file(const char *);
 extern void     conf_cleanup(void);
 extern int      conf_match_num(const char *, const char *, int);
diff --git a/support/nfs/conffile.c b/support/nfs/conffile.c
index aea35917..cbeef10d 100644
--- a/support/nfs/conffile.c
+++ b/support/nfs/conffile.c
@@ -752,6 +752,29 @@  conf_get_str_with_def(const char *section, const char *tag, char *def)
 	return result;
 }
 
+/*
+ * Retrieve an entry without interpreting its contents
+ */
+char *
+conf_get_entry(const char *section, const char *arg, const char *tag)
+{
+	struct conf_binding *cb;
+
+	cb = LIST_FIRST (&conf_bindings[conf_hash (section)]);
+	for (; cb; cb = LIST_NEXT (cb, link)) {
+		if (strcasecmp(section, cb->section) != 0)
+			continue;
+		if (arg && (cb->arg == NULL || strcasecmp(arg, cb->arg) != 0))
+			continue;
+		if (!arg && cb->arg)
+			continue;
+		if (strcasecmp(tag, cb->tag) != 0)
+			continue;
+		return cb->value;
+	}
+	return 0;
+}
+
 /*
  * Find a section that may or may not have an argument
  */
diff --git a/tools/nfsconf/nfsconf.man b/tools/nfsconf/nfsconf.man
index 30791988..26c72a69 100644
--- a/tools/nfsconf/nfsconf.man
+++ b/tools/nfsconf/nfsconf.man
@@ -1,7 +1,7 @@ 
 .\"
 .\" nfsconf(8)
 .\"
-.TH nfsconf 8 "2 May 2018"
+.TH nfsconf 8 "16 July 2020"
 .SH NAME
 nfsconf \- Query various NFS configuration settings
 .SH SYNOPSIS
@@ -20,6 +20,15 @@  nfsconf \- Query various NFS configuration settings
 .IR section
 .IR tag
 .P
+.B nfsconf \-\-entry
+.RB [ \-v | \-\-verbose ]
+.RB [ \-f | \-\-file
+.IR infile.conf ]
+.RB [ \-a | \-\-arg
+.IR subsection ]
+.IR section
+.IR tag
+.P
 .B nfsconf \-\-isset
 .RB [ \-v | \-\-verbose ]
 .RB [ \-f | \-\-file
@@ -62,6 +71,8 @@  Output an alphabetically sorted dump of the current configuration in conf file f
 Test if a specific tag has a value set.
 .IP "\fB\-g, \-\-get\fP"
 Output the current value of the specified tag.
+.IP "\fB\-e, \-\-entry\fP"
+Output the unmodified value of the specified tag without any variable expansion.
 .IP "\fB\-s, \-\-set\fP"
 Update or Add a tag and value to the config file in a specified section, creating the tag, section, and file if necessary. If the section is defined as '#' then a comment is appended to the file. If a comment is set with a tag name then any exiting tagged comment with a matching name is replaced.
 .IP "\fB\-u, \-\-unset\fP"
@@ -75,7 +86,7 @@  Increase verbosity and print debugging information.
 .B \-f, \-\-file \fIinfile\fR
 Select a different config file to operate upon, default is
 .I /etc/nfs.conf
-.SS Options only valid in \fB\-\-get\fR and \fB\-\-isset\fR modes.
+.SS Options only valid in \fB\-\-get\fR, \fB\-\-entry\fR, and \fB\-\-isset\fR modes.
 .TP
 .B \-a, \-\-arg \fIsubsection\fR
 Select a specific sub-section
@@ -108,5 +119,3 @@  Enable debugging in nfsd
 .BR exportfs (8),
 .BR idmapd (8),
 .BR statd (8)
-.SH AUTHOR
-Justin Mitchell <jumitche@redhat.com>
diff --git a/tools/nfsconf/nfsconfcli.c b/tools/nfsconf/nfsconfcli.c
index 361d386e..b2ef96d1 100644
--- a/tools/nfsconf/nfsconfcli.c
+++ b/tools/nfsconf/nfsconfcli.c
@@ -11,6 +11,7 @@ 
 typedef enum {
 	MODE_NONE,
 	MODE_GET,
+	MODE_ENTRY,
 	MODE_ISSET,
 	MODE_DUMP,
 	MODE_SET,
@@ -30,6 +31,8 @@  static void usage(const char *name)
 	fprintf(stderr, "      Outputs the configuration to the named file\n");
 	fprintf(stderr, "  --get [--arg subsection] {section} {tag}\n");
 	fprintf(stderr, "      Output one specific config value\n");
+	fprintf(stderr, "  --entry [--arg subsection] {section} {tag}\n");
+	fprintf(stderr, "      Output the uninterpreted config entry\n");
 	fprintf(stderr, "  --isset [--arg subsection] {section} {tag}\n");
 	fprintf(stderr, "      Return code indicates if config value is present\n");
 	fprintf(stderr, "  --set [--arg subsection] {section} {tag} {value}\n");
@@ -55,6 +58,7 @@  int main(int argc, char **argv)
 		int index = 0;
 		struct option long_options[] = {
 			{"get",		no_argument, 0, 'g' },
+			{"entry",	no_argument, 0, 'e' },
 			{"set",		no_argument, 0, 's' },
 			{"unset",	no_argument, 0, 'u' },
 			{"arg",	  required_argument, 0, 'a' },
@@ -66,7 +70,7 @@  int main(int argc, char **argv)
 			{NULL,			  0, 0, 0 }
 		};
 
-		c = getopt_long(argc, argv, "gsua:id::f:vm:", long_options, &index);
+		c = getopt_long(argc, argv, "gesua:id::f:vm:", long_options, &index);
 		if (c == -1) break;
 
 		switch (c) {
@@ -86,6 +90,9 @@  int main(int argc, char **argv)
 			case 'g':
 				mode = MODE_GET;
 				break;
+			case 'e':
+				mode = MODE_ENTRY;
+				break;
 			case 's':
 				mode = MODE_SET;
 				break;
@@ -167,8 +174,8 @@  int main(int argc, char **argv)
 		if (dumpfile)
 			fclose(out);
 	} else
-	/* --iset and --get share a lot of code */
-	if (mode == MODE_GET || mode == MODE_ISSET) {
+	/* --isset and --get share a lot of code */
+	if (mode == MODE_GET || mode == MODE_ISSET || mode == MODE_ENTRY) {
 		char * section = NULL;
 		char * tag = NULL;
 		const char * val;
@@ -186,14 +193,17 @@  int main(int argc, char **argv)
 		tag = argv[optind++];
 
 		/* retrieve the specified tags value */
-		val = conf_get_section(section, arg, tag);
+		if (mode == MODE_ENTRY)
+			val = conf_get_entry(section, arg, tag);
+		else
+			val = conf_get_section(section, arg, tag);
 		if (val != NULL) {
 			/* ret=0, success, mode --get wants to output the value as well */
-			if (mode == MODE_GET)
+			if (mode != MODE_ISSET)
 				printf("%s\n", val);
 		} else {
 			/* ret=1, no value found, tell the user if they asked */
-			if (mode == MODE_GET && verbose)
+			if (mode != MODE_ISSET && verbose)
 				fprintf(stderr, "Tag '%s' not found\n", tag);
 			ret = 1;
 		}