nativesdk: Handle chown/chgrp calls in nativesdk do_install tasks

We disable the useradd code for nativesdk targets since we don't support
postinstalls or multiple users in those cases. This means any usage
of chown/chgrp inside do_install tasks won't work and would have to be
conditional. Rather than require all recipes to do that, add intercepts
of the calls and map those to root/root user/groups. We can't just ignore
them as some calls are used to remove host contamination from the host
user ID so they need to be made, just as root.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 54 insertions, 0 deletions

diff --git a/scripts/nativesdk-intercept/chgrp b/scripts/nativesdk-intercept/chgrp
new file mode 100755
index 0000000000..30cc417d3a
--- /dev/null
+++ b/scripts/nativesdk-intercept/chgrp
@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+#
+# Wrapper around 'chgrp' that redirects to root in all cases
+
+import os
+import shutil
+import sys
+
+# calculate path to the real 'chgrp'
+path = os.environ['PATH']
+path = path.replace(os.path.dirname(sys.argv[0]), '')
+real_chgrp = shutil.which('chgrp', path=path)
+
+args = list()
+
+found = False
+for i in sys.argv:
+    if i.startswith("-"):
+        args.append(i)
+        continue
+    if not found:
+        args.append("root")
+        found = True
+    else:
+        args.append(i)
+
+os.execv(real_chgrp, args)
diff --git a/scripts/nativesdk-intercept/chown b/scripts/nativesdk-intercept/chown
new file mode 100755
index 0000000000..3914b3e384
--- /dev/null
+++ b/scripts/nativesdk-intercept/chown
@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+#
+# Wrapper around 'chown' that redirects to root in all cases
+
+import os
+import shutil
+import sys
+
+# calculate path to the real 'chown'
+path = os.environ['PATH']
+path = path.replace(os.path.dirname(sys.argv[0]), '')
+real_chown = shutil.which('chown', path=path)
+
+args = list()
+
+found = False
+for i in sys.argv:
+    if i.startswith("-"):
+        args.append(i)
+        continue
+    if not found:
+        args.append("root:root")
+        found = True
+    else:
+        args.append(i)
+
+os.execv(real_chown, args)