[Buildroot] [PATCH 08/10] support: mkusers: add warning when using mkpasswd from the host system

[Samuel Martin <s.martin49@gmail.com>]

Because the mkpasswd provided by some distribution does not support all
options used in the mkusers script, mkpasswd has been integrated as a
package.

However, using a custom rootfs skeleton, the host-mkpasswd target is not
automatically built, even if some packages add users.

In this case, to help the Buildroot users understanding what happen when
the mkpasswd from the host system is used (so, might fail), mkusers now
print a warning message explaining how to solve this.

Cc: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
---
 support/scripts/mkusers | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/support/scripts/mkusers b/support/scripts/mkusers
index 3b287b8..dd011eb 100755
--- a/support/scripts/mkusers
+++ b/support/scripts/mkusers
@@ -52,6 +52,22 @@ PASSWD_METHOD="$( sed -r -e '/^BR2_TARGET_GENERIC_PASSWD_METHOD="(.*)"$/!d;'
                 )"
 
 #----------------------------------------------------------------------------
+check_mkpasswd() {
+    local mkpasswd_path="$(readlink -f $(which mkpasswd 2>/dev/null))"
+    local host_dir="$(readlink -f "${HOST_DIR}")"
+    case "${mkpasswd_path}" in
+        "${host_dir}"*) ;;
+        *)
+            error \
+                "WARNING: using mkpasswd from the host system: '%s'. %s%s%s\n" \
+                "${mkpasswd_path}"                                             \
+                "To avoid build failures because of unsupported options by "   \
+                "your host system's mkpasswd, make sure to use the one "       \
+                "Buildroot provides, by building the 'host-mkpasswd' target."
+            ;;
+    esac
+}
+#----------------------------------------------------------------------------
 get_uid() {
     local username="${1}"
 
@@ -264,6 +280,7 @@ add_user_to_group() {
 encode_password() {
     local passwd="${1}"
 
+    check_mkpasswd
     mkpasswd -m "${PASSWD_METHOD}" "${passwd}"
 }
 
-- 
1.8.5.3