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Message-ID: <27c44cad99aacd597e498a434046c5f340d98d42.camel@redhat.com>
Subject: [PATCH 2/4] nfs-utils: Enable the retrieval of raw config settings
 without expansion
From:   Alice Mitchell <ajmitchell@redhat.com>
To:     Linux NFS Mailing list <linux-nfs@vger.kernel.org>
Cc:     Steve Dickson <steved@redhat.com>
Date:   Fri, 10 Jul 2020 17:40:36 +0100
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References: <5a84777afb9ed8c866841471a1a7e3c9b295604d.camel@redhat.com>
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Config entries sometimes contain variable expansions, this adds options
to retrieve the config entry rather than its current expanded value.
---
 support/include/conffile.h |  1 +
 support/nfs/conffile.c     | 23 +++++++++++++++++++++++
 tools/nfsconf/nfsconfcli.c | 22 ++++++++++++++++------
 3 files changed, 40 insertions(+), 6 deletions(-)

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/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;
 		}
-- 
2.18.1