dotcloud/docker

# Set up files and directories with known ownership
FROM busybox AS source
RUN touch /file && chown 100:200 /file \
 && mkdir -p /dir/subdir \
 && touch /dir/subdir/nestedfile \
 && chown 100:200 /dir \
 && chown 101:201 /dir/subdir \
 && chown 102:202 /dir/subdir/nestedfile

FROM busybox AS test_base
RUN mkdir -p /existingdir/existingsubdir \
 && touch /existingdir/existingfile \
 && chown 500:600 /existingdir \
 && chown 501:601 /existingdir/existingsubdir \
 && chown 501:601 /existingdir/existingfile


# Copy files from the source stage
FROM test_base AS copy_from
COPY --from=source /file .
# Copy to a non-existing target directory creates the target directory (as root), then copies the _contents_ of the source directory into it
COPY --from=source /dir /dir
# Copying to an existing target directory will copy the _contents_ of the source directory into it
COPY --from=source /dir/. /existingdir

RUN e="100:200"; p="/file"                         ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
 && e="0:0";     p="/dir"                          ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
 && e="101:201"; p="/dir/subdir"                   ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
 && e="102:202"; p="/dir/subdir/nestedfile"        ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
# Existing files and directories ownership should not be modified
 && e="500:600"; p="/existingdir"                  ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
 && e="501:601"; p="/existingdir/existingsubdir"   ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
 && e="501:601"; p="/existingdir/existingfile"     ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
# But new files and directories should maintain their ownership
 && e="101:201"; p="/existingdir/subdir"           ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
 && e="102:202"; p="/existingdir/subdir/nestedfile"; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi


# Copy files from the source stage and chown them.
FROM test_base AS copy_from_chowned
COPY --from=source --chown=300:400 /file .
# Copy to a non-existing target directory creates the target directory (as root), then copies the _contents_ of the source directory into it
COPY --from=source --chown=300:400 /dir /dir
# Copying to an existing target directory copies the _contents_ of the source directory into it
COPY --from=source --chown=300:400 /dir/. /existingdir

RUN e="300:400"; p="/file"                         ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
 && e="300:400"; p="/dir"                          ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
 && e="300:400"; p="/dir/subdir"                   ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
 && e="300:400"; p="/dir/subdir/nestedfile"        ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
# Existing files and directories ownership should not be modified
 && e="500:600"; p="/existingdir"                  ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
 && e="501:601"; p="/existingdir/existingsubdir"   ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
 && e="501:601"; p="/existingdir/existingfile"     ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
# But new files and directories should be chowned
 && e="300:400"; p="/existingdir/subdir"           ; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi \
 && e="300:400"; p="/existingdir/subdir/nestedfile"; a=`stat -c "%u:%g" "$p"`; if [ "$a" != "$e" ]; then echo "incorrect ownership on $p. expected $e, got $a"; exit 1; fi