execute: drop empty assignments from env blocks on execution but keep them around otherwise to make them visible

1 files changed, 22 insertions, 1 deletions

diff --git a/src/strv.c b/src/strv.c
index d9aef9822..d1c7b2c32 100644
--- a/src/strv.c
+++ b/src/strv.c
@@ -380,7 +380,7 @@ static int env_append(char **r, char ***k, char **a) {
 
         /* Add the entries of a to *k unless they already exist in *r
          * in which case they are overriden instead. This assumes
-         * there is enough space in the r */
+         * there is enough space in the r array. */
 
         for (; *a; a++) {
                 char **j;
@@ -556,3 +556,24 @@ char *strv_env_get_with_length(char **l, const char *name, size_t k) {
 char *strv_env_get(char **l, const char *name) {
         return strv_env_get_with_length(l, name, strlen(name));
 }
+
+char **strv_env_clean(char **l) {
+        char **r, **ret;
+
+        for (r = ret = l; *l; l++) {
+                const char *equal;
+
+                equal = strchr(*l, '=');
+
+                if (equal && equal[1] == 0) {
+                        free(*l);
+                        continue;
+                }
+
+                *(r++) = *l;
+        }
+
+        *r = NULL;
+
+        return ret;
+}