From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 19 Aug 2014 00:14:32 +0000 (+0200)
Subject: sysusers: optionally, read sysuers configuration from standard input
X-Git-Tag: v216~37
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=dfc87cbfe5ec03190e5b2235b1ed477db11541ca

sysusers: optionally, read sysuers configuration from standard input
---

diff --git a/man/systemd-sysusers.xml b/man/systemd-sysusers.xml
index 4de1973dc..68710603a 100644
--- a/man/systemd-sysusers.xml
+++ b/man/systemd-sysusers.xml
@@ -75,7 +75,10 @@
                 basename of a file is specified, all directories as
                 specified in
                 <citerefentry><refentrytitle>sysusers.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
-                are searched for a matching file.</para>
+                are searched for a matching file. If the string
+                <filename>-</filename> is specified as filenames
+                entries from the standard input of the process are
+                read.</para>
         </refsect1>
 
         <refsect1>
diff --git a/src/sysusers/sysusers.c b/src/sysusers/sysusers.c
index 7daea2807..f78fb4fff 100644
--- a/src/sysusers/sysusers.c
+++ b/src/sysusers/sysusers.c
@@ -1573,20 +1573,27 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
 }
 
 static int read_config_file(const char *fn, bool ignore_enoent) {
-        _cleanup_fclose_ FILE *f = NULL;
+        _cleanup_fclose_ FILE *rf = NULL;
+        FILE *f = NULL;
         char line[LINE_MAX];
         unsigned v = 0;
         int r;
 
         assert(fn);
 
-        r = search_and_fopen_nulstr(fn, "re", arg_root, conf_file_dirs, &f);
-        if (r < 0) {
-                if (ignore_enoent && r == -ENOENT)
-                        return 0;
+        if (streq(fn, "-"))
+                f = stdin;
+        else {
+                r = search_and_fopen_nulstr(fn, "re", arg_root, conf_file_dirs, &rf);
+                if (r < 0) {
+                        if (ignore_enoent && r == -ENOENT)
+                                return 0;
 
-                log_error("Failed to open '%s', ignoring: %s", fn, strerror(-r));
-                return r;
+                        log_error("Failed to open '%s', ignoring: %s", fn, strerror(-r));
+                        return r;
+                }
+
+                f = rf;
         }
 
         FOREACH_LINE(line, f, break) {