backuptool: Preserve the SELinux context of the files
Add a function that allows to copy files preserving their SELinux
context that is generic enough to work with both busybox and toybox.
Change-Id: If2c245863df5675c18dbf43b6bcedeb33383fc38
diff --git a/prebuilt/common/bin/backuptool.functions b/prebuilt/common/bin/backuptool.functions
index c7e47b9..4528a33 100644
--- a/prebuilt/common/bin/backuptool.functions
+++ b/prebuilt/common/bin/backuptool.functions
@@ -7,6 +7,16 @@
export S=/system
export V=14.1
+copy_file() {
+ cp -dp "$1" "$2"
+ # symlinks don't have a context
+ if [ ! -L "$1" ]; then
+ # it is assumed that every label starts with 'u:object_r' and has no white-spaces
+ local context=`ls -Z "$1" | grep -o 'u:object_r:[^ ]*' | head -1`
+ chcon "$context" "$2"
+ fi
+}
+
backup_file() {
if [ -e "$1" -o -L "$1" ]; then
local F=`basename "$1"`
@@ -16,7 +26,7 @@
echo "Skipping odexed apk $1";
else
mkdir -p "$C/$D"
- cp -dp $1 "$C/$D/$F"
+ copy_file "$1" "$C/$D/$F"
fi
fi
}
@@ -28,7 +38,7 @@
if [ ! -d "$DIR" ]; then
mkdir -p "$DIR";
fi
- cp -dp "$C/$DIR/$FILE" "$1";
+ copy_file "$C/$DIR/$FILE" "$1";
if [ -n "$2" ]; then
echo "Deleting obsolete file $2"
rm "$2";