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[PATCH v3 1/7] glib-compat: add g_unix_get_passwd_entry_qemu()

From: marcandre . lureau
Subject: [PATCH v3 1/7] glib-compat: add g_unix_get_passwd_entry_qemu()
Date: Tue, 20 Oct 2020 12:12:51 +0400

From: Marc-André Lureau <marcandre.lureau@redhat.com>

The glib function was introduced in 2.64. It's a safer version of
getpwnam, and also simpler to use than getpwnam_r.

Currently, it's only use by the next patch in qemu-ga, which doesn't
(well well...) need the thread safety guarantees. Since the fallback
version is still unsafe, I would rather keep the _qemu postfix, to make
sure it's not being misused by mistake. When/if necessary, we can
implement a safer fallback and drop the _qemu suffix.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
 include/glib-compat.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/include/glib-compat.h b/include/glib-compat.h
index 0b0ec76299..64e68aa730 100644
--- a/include/glib-compat.h
+++ b/include/glib-compat.h
@@ -30,6 +30,11 @@
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 #include <glib.h>
+#if defined(G_OS_UNIX)
+#include <glib-unix.h>
+#include <sys/types.h>
+#include <pwd.h>
  * Note that because of the GLIB_VERSION_MAX_ALLOWED constant above, allowing
@@ -72,6 +77,27 @@
 gint g_poll_fixed(GPollFD *fds, guint nfds, gint timeout);
+#if defined(G_OS_UNIX)
+/* Note: The fallback implementation is not MT-safe, and it returns a copy of
+ * the libc passwd (must be g_free() after use) but not the content. Because of
+ * these important differences the caller must be aware of, it's not #define 
+ * GLib API substitution. */
+static inline struct passwd *
+g_unix_get_passwd_entry_qemu(const gchar *user_name, GError **error)
+#if GLIB_CHECK_VERSION(2, 64, 0)
+    return g_unix_get_passwd_entry(user_name, error);
+    struct passwd *p = getpwnam(user_name);
+    if (!p) {
+        g_set_error_literal(error, G_UNIX_ERROR, 0, g_strerror(errno));
+        return NULL;
+    }
+    return (struct passwd *)g_memdup(p, sizeof(*p));
+#endif /* G_OS_UNIX */
 #pragma GCC diagnostic pop

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