From 565d91fdf198b88f7c2d72c67cfc6c30341a3596 Mon Sep 17 00:00:00 2001
From: Michal Vyskocil <mvyskocil@suse.cz>
Date: Fri, 18 Jan 2013 10:05:10 +0100
Subject: [PATCH] util: continuation support for load_env_file

Variable definitions can be written on more than one line - if each ends
with a backslash, then is concatenated with a previous one. Only
backslash and unix end of line (\n) are treated as a continuation.

Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=58083

[zj: squashed two patches together; cleaned up grammar; removed
     comment about ignoring trailing backslash -- it is not ignored.]

Document continuation support in systemd.exec
---
 man/systemd.exec.xml |    8 +++++---
 src/shared/util.c    |   43 ++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 43 insertions(+), 8 deletions(-)

Index: systemd-195/man/systemd.exec.xml
===================================================================
--- systemd-195.orig/man/systemd.exec.xml
+++ systemd-195/man/systemd.exec.xml
@@ -282,9 +282,11 @@
                                 contain new-line separated variable
                                 assignments. Empty lines and lines
                                 starting with ; or # will be ignored,
-                                which may be used for commenting. The
-                                parser strips leading and
-                                trailing whitespace from the values
+                                which may be used for commenting. A line
+                                ending with a backslash will be concatenated
+                                with the following one, allowing multiline variable
+                                definitions. The parser strips leading
+                                and trailing whitespace from the values
                                 of assignments, unless you use
                                 double quotes (").
                                 The
Index: systemd-195/src/shared/util.c
===================================================================
--- systemd-195.orig/src/shared/util.c
+++ systemd-195/src/shared/util.c
@@ -876,69 +876,89 @@ fail:
         return r;
 }
 
-int load_env_file(
-                const char *fname,
-                char ***rl) {
-
-        FILE *f;
-        char **m = NULL;
-        int r;
+int load_env_file(const char *fname,
+                  char ***rl) {
+
+        FILE _cleanup_fclose_ *f;
+        char *b;
+        char _cleanup_free_ *c = NULL;
+        char _cleanup_strv_free_ **m = NULL;
 
         assert(fname);
         assert(rl);
 
-        if (!(f = fopen(fname, "re")))
+        f = fopen(fname, "re");
+        if (!f)
                 return -errno;
 
         while (!feof(f)) {
-                char l[LINE_MAX], *p, *u;
+                char l[LINE_MAX], *p, *u, *cs;
                 char **t;
 
                 if (!fgets(l, sizeof(l), f)) {
-                        if (feof(f))
+                        if (!feof(f))
+                                return -errno;
+                        else if (!c)
                                 break;
+                }
 
-                        r = -errno;
-                        goto finish;
+                cs = endswith(l, "\\\n");
+                if (cs) {
+                        *cs = '\0';
+                        b = strappend(c, l);
+                        if (!b)
+                                return log_oom();
+
+                        free(c);
+                        c = b;
+                        *l = '\0';
+                        continue;
                 }
 
-                p = strstrip(l);
+                if (c) {
+                        b = strappend(c, l);
+                        if (!b)
+                                return log_oom();
 
-                if (!*p)
-                        continue;
+                        free(c);
+                        c = b;
+                }
+
+                p = strstrip(c ? c : l);
 
-                if (strchr(COMMENTS, *p))
+                if (!*p) {
+                        free(c);
+                        c = NULL;
                         continue;
+                }
 
-                if (!(u = normalize_env_assignment(p))) {
-                        r = log_oom();
-                        goto finish;
+                if (strchr(COMMENTS, *p)) {
+                        free(c);
+                        c = NULL;
+                        continue;
                 }
 
+                u = normalize_env_assignment(p);
+                if (!u)
+                        return log_oom();
+
+                free(c);
+                c = NULL;
+
                 t = strv_append(m, u);
                 free(u);
 
-                if (!t) {
-                        r = log_oom();
-                        goto finish;
-                }
+                if (!t)
+                        return log_oom();
 
                 strv_free(m);
                 m = t;
         }
 
-        r = 0;
-
         *rl = m;
         m = NULL;
 
-finish:
-        if (f)
-                fclose(f);
-
-        strv_free(m);
-
-        return r;
+        return 0;
 }
 
 int write_env_file(const char *fname, char **l) {