This will allow us to have hardlink checkouts of archives. A key use
case here is an archive repo of an OS (with root-owned files etc.)
where we want to do builds in a user tree.
A positive side effect of doing things this way is that now the SHA256
checksums for a given file should be identical regardless of whether
it's stored in an archive or bare repository.
This moves us closer to consistently passing around a triple of:
(GFileInfo *info, GVariant *xattrs, GInputStream *content)
Which will help the libarchive work.
We never actually dropped into the bits to write metadata as packfiles,
because such a thing doesn't exist.
Also add a GInputStream-based API for writing packfiles.
This commit originally was to port ostree_stat_and_checksum_file() to
GFile*, but I noticed that the checksum code was reading data in host
endianness. Fix that while we're here.
This invalidates all existing repositories.
This necessitated a large set of changes.
We now support an "archive" mode for repositories. In this mode,
files are stored "packed" rather than hard linked. This allows one to
e.g. store an OSTree repository with root-owned files as non-root. It
is also used as the basis for serving repositories via HTTP.
While doing this I realized that GVariant is endianness-dependent; I
decided to just store all data in big endian.
Colin Walters