ask-password: add support for caching passwords in the kernel keyring

This adds support for caching harddisk passwords in the kernel keyring
if it is available, thus supporting caching without Plymouth being
around.

This is also useful for hooking up "gdm-auto-login" with the collected
boot-time harddisk password, in order to support gnome keyring
passphrase unlocking via the HDD password, if it is the same.

Any passwords added to the kernel keyring this way have a timeout of
2.5min at which time they are purged from the kernel.

1 files changed, 25 insertions, 2 deletions

diff --git a/src/test/test-strv.c b/src/test/test-strv.c
index 64801f8e01..623c926521 100644
--- a/src/test/test-strv.c
+++ b/src/test/test-strv.c
@@ -341,11 +341,11 @@ static void test_strv_extend_strv(void) {
         _cleanup_strv_free_ char **a = NULL, **b = NULL;
 
         a = strv_new("abc", "def", "ghi", NULL);
-        b = strv_new("jkl", "mno", "pqr", NULL);
+        b = strv_new("jkl", "mno", "abc", "pqr", NULL);
         assert_se(a);
         assert_se(b);
 
-        assert_se(strv_extend_strv(&a, b) >= 0);
+        assert_se(strv_extend_strv(&a, b, true) == 3);
 
         assert_se(streq(a[0], "abc"));
         assert_se(streq(a[1], "def"));
@@ -618,6 +618,28 @@ static void test_strv_extend_n(void) {
         assert_se(v[1] == NULL);
 }
 
+static void test_strv_make_nulstr_one(char **l) {
+        _cleanup_free_ char *b = NULL, *c = NULL;
+        _cleanup_strv_free_ char **q = NULL;
+        size_t n, m;
+
+        assert_se(strv_make_nulstr(l, &b, &n) >= 0);
+        assert_se(q = strv_parse_nulstr(b, n));
+        assert_se(strv_equal(l, q));
+
+        assert_se(strv_make_nulstr(q, &c, &m) >= 0);
+        assert_se(m == n);
+        assert_se(memcmp(b, c, m) == 0);
+}
+
+static void test_strv_make_nulstr(void) {
+        test_strv_make_nulstr_one(NULL);
+        test_strv_make_nulstr_one(STRV_MAKE(NULL));
+        test_strv_make_nulstr_one(STRV_MAKE("foo"));
+        test_strv_make_nulstr_one(STRV_MAKE("foo", "bar"));
+        test_strv_make_nulstr_one(STRV_MAKE("foo", "bar", "quuux"));
+}
+
 int main(int argc, char *argv[]) {
         test_specifier_printf();
         test_strv_foreach();
@@ -678,6 +700,7 @@ int main(int argc, char *argv[]) {
         test_strv_shell_escape();
         test_strv_skip();
         test_strv_extend_n();
+        test_strv_make_nulstr();
 
         return 0;
 }