This matches what tar does, and without it the tarsum created
by the registry will not match the docker one.
Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
This uses a plain filepath.Walk + addTarFile to create a tar file,
optionially compressing it with gzip.
Unfortunately go only has gzip compression support, not bzip2 or xz.
However, this is not a regression, as docker currently uses *no*
compression for TarFilter(). The only compression of tarfiles
currently happens in utils/tarsum.go, and that manually does gzip
compression.
Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
This is the code that takes a normal file and adds it to a TarWriter.
We extract it so that we can share it with Tar().
Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
This simplifies that code that calls out to tar by removing support
for now unused features.
Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
This replaces the shelling out to tar with a reimplementation of untar
based on the archive/tar code and the pre-existing code from ApplyLayer
to create real files from tar headers.
Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
This reverts commit 733bf5d3dd.
This is needed to fix "no such file" errors `docker build` errors for
devicemapper.
This fixes issue #3449.
Docker-DCO-1.0-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
When pulling from a registry we get a compressed tar archive, so
we need to wrap the stream in the right kind of compress reader.
Unfortunately go doesn't have an Xz decompression method, but I
don't think any docker layers use that atm anyway.
Alexander Larsson