lacme-accountd: Don't error out when the default configuration file is missing.

Instead, treat it as an empty file.  This makes it possible to use
lacme-accountd(1) without configuration file under ~/.config/lacme.

2 files changed, 19 insertions, 13 deletions

diff --git a/lacme-accountd b/lacme-accountd
index 1dc5f03..b9a6e33 100755
--- a/lacme-accountd
+++ b/lacme-accountd
@@ -69,16 +69,19 @@ do {
         ( ($ENV{XDG_CONFIG_HOME} // "$ENV{HOME}/.config") . "/lacme/$NAME.conf"
         , "@@sysconfdir@@/lacme/$NAME.conf"
         );
-    die "Error: Can't find configuration file\n" unless defined $conffile;
-    print STDERR "Using configuration file: $conffile\n" if $OPTS{debug};
-
-    my $h = Config::Tiny::->read($conffile) or die Config::Tiny::->errstr()."\n";
-    my $h2 = delete $h->{_} // {};
-    die "Invalid section(s): ".join(', ', keys %$h)."\n" if %$h;
-    my %h = map { $_ => delete $h2->{$_} } qw/privkey gpg socket quiet/;
-    die "Unknown option(s): ".join(', ', keys %$h2)."\n" if %$h2;
-    $h{quiet} = lc $h{quiet} eq 'yes' ? 1 : 0 if defined $h{quiet};
-    $OPTS{$_} //= $h{$_} foreach grep {defined $h{$_}} keys %h;
+
+    if (defined $OPTS{config} or -e $conffile) {
+        print STDERR "Using configuration file: $conffile\n" if $OPTS{debug};
+        my $h = Config::Tiny::->read($conffile) or die Config::Tiny::->errstr()."\n";
+        my $h2 = delete $h->{_} // {};
+        die "Invalid section(s): ".join(', ', keys %$h)."\n" if %$h;
+        my %h = map { $_ => delete $h2->{$_} } qw/privkey gpg socket quiet/;
+        die "Unknown option(s): ".join(', ', keys %$h2)."\n" if %$h2;
+        $h{quiet} = lc $h{quiet} eq 'yes' ? 1 : 0 if defined $h{quiet};
+        $OPTS{$_} //= $h{$_} foreach grep {defined $h{$_}} keys %h;
+    } else {
+        print STDERR "Ignoring missing configuration file at default location $conffile\n" if $OPTS{debug};
+    }
 
     $OPTS{quiet} = 0 if $OPTS{debug};
     die "Error: 'privkey' is not specified\n" unless defined $OPTS{privkey};
diff --git a/lacme-accountd.1.md b/lacme-accountd.1.md
index e628476..5303418 100644
--- a/lacme-accountd.1.md
+++ b/lacme-accountd.1.md
@@ -41,9 +41,12 @@ Options
 
 `--config=`*filename*
 
-:   Use *filename* as configuration file.  See the **[configuration
-    file](#configuration-file)** section below for the configuration
-    options.
+:   Use *filename* as configuration file.  `lacme-accountd` fails when
+    `--config=` is used with a non-existent file, but a non-existent
+    default location is treated as if it were an empty file.
+
+    See the **[configuration file](#configuration-file)** section below
+    for the configuration options.
 
 `--privkey=`*value*