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backuptool: Preserve the SELinux context of the files

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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
This commit is contained in:
Gabriele M 2017-02-27 15:44:17 +01:00 committed by Jason Riordan
parent cf276aa7cd
commit 52996421a1
1 changed files with 12 additions and 2 deletions
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14
prebuilt/common/bin/backuptool.functions
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@ -7,6 +7,16 @@ export C=/tmp/backupdir
export S=/system export S=/system
export V=13.0 export V=13.0
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() { backup_file() {
if [ -e "$1" -o -L "$1" ]; then if [ -e "$1" -o -L "$1" ]; then
local F=`basename "$1"` local F=`basename "$1"`
@ -16,7 +26,7 @@ backup_file() {
echo "Skipping odexed apk $1"; echo "Skipping odexed apk $1";
else else
mkdir -p "$C/$D" mkdir -p "$C/$D"
cp -p $1 "$C/$D/$F" copy_file "$1" "$C/$D/$F"
fi fi
fi fi
} }
@ -28,7 +38,7 @@ restore_file() {
if [ ! -d "$DIR" ]; then if [ ! -d "$DIR" ]; then
mkdir -p "$DIR"; mkdir -p "$DIR";
fi fi
cp -p "$C/$DIR/$FILE" "$1"; copy_file "$C/$DIR/$FILE" "$1";
if [ -n "$2" ]; then if [ -n "$2" ]; then
echo "Deleting obsolete file $2" echo "Deleting obsolete file $2"
rm "$2"; rm "$2";