autofs-5.0.7 - Allow nsswitch.conf to not contain "automount:" lines

From: Michael Tokarev <mjt@tls.msk.ru>

Current code does not allow a case when nsswitch.conf
does not mention automount map at all, like all new
installations.  It logs a rather unpleasant error
message instead:

 syntax error in nsswitch config near [ syntax error ]

this patch has a minimal fix, to allo "file" to be empty.

Whole parser in C is about 25 lines of code, the "grammar"
is trivial, and it is better to ditch all this yacc/lex
stuff, but that will be much more intrusive change.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Cc: 682266@bugs.debian.org
---

 CHANGELOG       |    1 +
 lib/nss_parse.y |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)


diff --git a/CHANGELOG b/CHANGELOG
index bd0dd82..16ac2a0 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -16,6 +16,7 @@
 - increase file map read buffer size.
 - handle new location of systemd.
 - fix map entry duplicate offset detection.
+- Allow nsswitch.conf to not contain "automount:" lines.
 
 25/07/2012 autofs-5.0.7
 =======================
diff --git a/lib/nss_parse.y b/lib/nss_parse.y
index a39fda4..055e9d7 100644
--- a/lib/nss_parse.y
+++ b/lib/nss_parse.y
@@ -72,6 +72,7 @@ file: {
 		nss_debug = YYDEBUG;
 #endif
 	} sources NL
+	| /* empty */
 	;
 
 sources: nss_source