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Jonathan Lebon 97c673b64b lib/pull: Rename variable for clarity 
Let's use `checksum` instead of the more general `contents`.

Closes: #1891
Approved by: cgwalters
 		2019-07-29 13:58:29 +00:00
..
README-gpg pull: Verify commits with gpg signatures from detached metadata 2013-09-29 14:49:47 -04:00
README.md core: Associate branches with remotes, move trigger runs into checkout 2012-04-03 23:46:34 -04:00
bupsplit.c lib: Move the bupsplit selftest into our test framework 2017-02-02 16:51:36 +00:00
bupsplit.h lib: Move the bupsplit selftest into our test framework 2017-02-02 16:51:36 +00:00
libostree-devel.sym lib/kargs: add missing function to symbol-versioning table 2019-07-02 13:58:26 +00:00
libostree-released.sym Release 2019.2 2019-04-25 16:47:40 +00:00
ostree-1.pc.in libostree: Expose $OSTREE_FEATURES in the pkg-config file 2017-05-08 18:48:07 +00:00
ostree-async-progress.c lib/progress: Fix leak of GSource 2018-09-28 21:40:41 +00:00
ostree-async-progress.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-autocleanups.h lib/kargs: Don't expose OstreeKernelArgs autoptr cleanup on old glib 2019-07-27 03:20:21 +00:00
ostree-bloom-private.h Fix building P2P code against old glib versions 2018-05-30 14:19:25 +00:00
ostree-bloom.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-bootconfig-parser.c tree-wide: Remove Emacs modelines 2017-09-21 21:38:34 +00:00
ostree-bootconfig-parser.h tree-wide: Remove Emacs modelines 2017-09-21 21:38:34 +00:00
ostree-bootloader-grub2.c grub2: Generate config from pending deployment 2019-04-24 21:29:39 +00:00
ostree-bootloader-grub2.h tree-wide: Remove Emacs modelines 2017-09-21 21:38:34 +00:00
ostree-bootloader-syslinux.c grub2: Generate config from pending deployment 2019-04-24 21:29:39 +00:00
ostree-bootloader-syslinux.h tree-wide: Remove Emacs modelines 2017-09-21 21:38:34 +00:00
ostree-bootloader-uboot.c lib/kargs: Make API public and upstream new rpm-ostree APIs 2019-06-18 14:29:14 +00:00
ostree-bootloader-uboot.h tree-wide: Remove Emacs modelines 2017-09-21 21:38:34 +00:00
ostree-bootloader.c grub2: Generate config from pending deployment 2019-04-24 21:29:39 +00:00
ostree-bootloader.h grub2: Generate config from pending deployment 2019-04-24 21:29:39 +00:00
ostree-chain-input-stream.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-chain-input-stream.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-checksum-input-stream.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-checksum-input-stream.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-cmdprivate.c Add concept of "staged" deployment 2018-04-12 14:55:12 +00:00
ostree-cmdprivate.h Add concept of "staged" deployment 2018-04-12 14:55:12 +00:00
ostree-core-private.h Make P2P API public (no longer experimental) 2018-06-04 19:20:10 +00:00
ostree-core.c lib: add minimum version to various symbols based on libostree-released.sym 2019-05-19 14:50:08 +00:00
ostree-core.h Only verify OSTREE_MAX_METADATA_SIZE for HTTP fetches 2018-10-01 13:23:50 +00:00
ostree-deployment-private.h Add concept of "staged" deployment 2018-04-12 14:55:12 +00:00
ostree-deployment.c lib: add minimum version to various symbols based on libostree-released.sym 2019-05-19 14:50:08 +00:00
ostree-deployment.h Add concept of "staged" deployment 2018-04-12 14:55:12 +00:00
ostree-diff.c lib: add minimum version to various symbols based on libostree-released.sym 2019-05-19 14:50:08 +00:00
ostree-diff.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-dummy-enumtypes.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-dummy-enumtypes.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-enumtypes.c.template build: Add -Werror=undef by default, fix fallout 2017-11-06 15:30:14 +00:00
ostree-enumtypes.h.template Make enum generation private by default, export stub symbol 2016-05-12 17:15:50 +00:00
ostree-fetcher-curl.c pull: If built with --disable-http2, allow enabling via http2=1 2019-01-09 15:04:27 +00:00
ostree-fetcher-soup.c lib: Check for http_proxy being the empty string 2019-04-02 20:44:08 +00:00
ostree-fetcher-uri.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-fetcher-util.c lib/fetcher-util: Use GIOErrorEnum instead of GIOError 2019-05-20 13:09:28 +00:00
ostree-fetcher-util.h lib/fetcher-util: Use GIOErrorEnum instead of GIOError 2019-05-20 13:09:28 +00:00
ostree-fetcher.h lib/fetcher: Allow clients to append to User-Agent 2018-03-16 19:21:31 +00:00
ostree-gpg-verifier.c lib: Kill GPG agent when cleaning up tmp homedirs 2019-06-19 17:30:24 +00:00
ostree-gpg-verifier.h lib/repo: Search a list of paths in gpgkeypath for gpg keys 2018-11-21 17:03:10 +00:00
ostree-gpg-verify-result-private.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-gpg-verify-result.c lib/gpg: Show if GPG key has been revoked 2019-06-19 17:17:11 +00:00
ostree-gpg-verify-result.h lib/gpg: Show information for expired keys 2019-06-19 17:17:11 +00:00
ostree-impl-system-generator.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-kernel-args.c lib/kargs: Make API public and upstream new rpm-ostree APIs 2019-06-18 14:29:14 +00:00
ostree-kernel-args.h lib/kargs: Don't expose OstreeKernelArgs autoptr cleanup on old glib 2019-07-27 03:20:21 +00:00
ostree-libarchive-input-stream.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-libarchive-input-stream.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-libarchive-private.h lib/commit: Added new ostree_repo_write_archive_to_mtree_from_fd() 2019-05-28 17:03:22 +00:00
ostree-linuxfsutil.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-linuxfsutil.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-lzma-common.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-lzma-common.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-lzma-compressor.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-lzma-compressor.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-lzma-decompressor.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-lzma-decompressor.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-metalink.c lib/repo-pull: Support retrying requests on transient network errors 2018-05-30 16:23:57 +00:00
ostree-metalink.h lib/repo-pull: Support retrying requests on transient network errors 2018-05-30 16:23:57 +00:00
ostree-mutable-tree.c lib: add some missing (out) annotations 2019-05-19 14:50:08 +00:00
ostree-mutable-tree.h OstreeMutableTree: add _remove method 2018-09-20 17:49:55 +00:00
ostree-ref.c lib: fix up some nullability annotations 2019-05-19 14:50:08 +00:00
ostree-ref.h Make P2P API public (no longer experimental) 2018-06-04 19:20:10 +00:00
ostree-remote-private.h Make P2P API public (no longer experimental) 2018-06-04 19:20:10 +00:00
ostree-remote.c Make P2P API public (no longer experimental) 2018-06-04 19:20:10 +00:00
ostree-remote.h Make P2P API public (no longer experimental) 2018-06-04 19:20:10 +00:00
ostree-repo-checkout.c lib: add minimum version to various symbols based on libostree-released.sym 2019-05-19 14:50:08 +00:00
ostree-repo-commit.c lib: add minimum version to various symbols based on libostree-released.sym 2019-05-19 14:50:08 +00:00
ostree-repo-deprecated.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-repo-file-enumerator.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-repo-file-enumerator.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-repo-file.c lib: add some missing (out) annotations 2019-05-19 14:50:08 +00:00
ostree-repo-file.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-repo-finder-avahi-parser.c Fix building against old glib versions 2018-06-07 17:28:49 +00:00
ostree-repo-finder-avahi-private.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-repo-finder-avahi.c avahi: Be robust to missing refs in peer summaries 2018-09-07 10:19:24 +00:00
ostree-repo-finder-avahi.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-repo-finder-config.c OstreeRepoFinderConfig: Fix guint/gsize confusion 2018-06-27 15:24:18 +00:00
ostree-repo-finder-config.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-repo-finder-mount.c Revert "lib: Fix building against old glib versions" 2018-06-07 17:28:49 +00:00
ostree-repo-finder-mount.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-repo-finder-override.c Revert "lib: Fix building against old glib versions" 2018-06-07 17:28:49 +00:00
ostree-repo-finder-override.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-repo-finder.c Fix building against old glib versions 2018-06-07 17:28:49 +00:00
ostree-repo-finder.h ostree-repo-finder: Clarify immutability after construction 2019-05-29 03:36:06 +00:00
ostree-repo-libarchive.c lib/commit: Added new ostree_repo_write_archive_to_mtree_from_fd() 2019-05-28 17:03:22 +00:00
ostree-repo-private.h Add sysroot.bootloader repo config key 2019-03-01 21:20:35 +00:00
ostree-repo-prune.c lib: add minimum version to various symbols based on libostree-released.sym 2019-05-19 14:50:08 +00:00
ostree-repo-pull-private.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-repo-pull.c lib/pull: Rename variable for clarity 2019-07-29 13:58:29 +00:00
ostree-repo-refs.c lib: add minimum version to various symbols based on libostree-released.sym 2019-05-19 14:50:08 +00:00
ostree-repo-static-delta-compilation-analysis.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-repo-static-delta-compilation.c ostree_repo_static_delta_generate: Fix leak 2018-08-13 17:50:33 +00:00
ostree-repo-static-delta-core.c static-delta: Change `show` to display from/to commits 2019-03-11 13:59:27 +00:00
ostree-repo-static-delta-private.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-repo-static-delta-processing.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-repo-traverse.c lib/repo: Add ostree_repo_traverse_commit_union_with_parents 2018-04-14 15:36:21 +00:00
ostree-repo.c lib/repo: Improve docs for get_min_free_space_bytes() 2019-06-26 14:14:08 +00:00
ostree-repo.h lib/commit: Added new ostree_repo_write_archive_to_mtree_from_fd() 2019-05-28 17:03:22 +00:00
ostree-rollsum.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-rollsum.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-sepolicy-private.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-sepolicy.c lib: add minimum version to various symbols based on libostree-released.sym 2019-05-19 14:50:08 +00:00
ostree-sepolicy.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-soup-form.c lib/repo: Add (transfer) annotations to various GHashTable arguments 2017-11-14 23:13:14 +00:00
ostree-soup-uri.c lib/repo: Add (transfer) annotations to various GHashTable arguments 2017-11-14 23:13:14 +00:00
ostree-soup-uri.h libcurl backend 2017-02-09 16:37:45 +00:00
ostree-sysroot-cleanup.c lib/sysroot: Add wrapper API to prune system repository 2018-05-24 12:56:11 +00:00
ostree-sysroot-deploy.c lib/kargs: Make API public and upstream new rpm-ostree APIs 2019-06-18 14:29:14 +00:00
ostree-sysroot-private.h lib/kargs: Make API public and upstream new rpm-ostree APIs 2019-06-18 14:29:14 +00:00
ostree-sysroot-upgrader.c lib/sysroot: Add OSTREE_EX_STAGE_DEPLOYMENTS environment variable 2018-05-11 12:39:17 +00:00
ostree-sysroot-upgrader.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-sysroot.c lib/kargs: Make API public and upstream new rpm-ostree APIs 2019-06-18 14:29:14 +00:00
ostree-sysroot.h lib/sysroot: Add wrapper API to prune system repository 2018-05-24 12:56:11 +00:00
ostree-tls-cert-interaction.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-tls-cert-interaction.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-types.h Make P2P API public (no longer experimental) 2018-06-04 19:20:10 +00:00
ostree-varint.c Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-varint.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-version.h.in Add OSTREE_BUILT_FEATURES to ostree-version.h 2019-07-29 13:58:13 +00:00
ostree.h lib/kargs: Don't expose OstreeKernelArgs autoptr cleanup on old glib 2019-07-27 03:20:21 +00:00

README.md

Repository design

At the heart of OSTree is the repository. It's very similar to git, with the idea of content-addressed storage. However, OSTree is designed to store operating system binaries, not source code. There are several consequences to this. The key difference as compared to git is that the OSTree definition of "content" includes key Unix metadata such as owner uid/gid, as well as all extended attributes.

Essentially OSTree is designed so that if two files have the same OSTree checksum, it's safe to replace them with a hard link. This fundamental design means that an OSTree repository imposes negligible overhead. In contrast, a git repository stores copies of zlib-compressed data.

Key differences versus git

  • As mentioned above, extended attributes and owner uid/gid are versioned
  • Optimized for Unix hardlinks between repository and checkout
  • SHA256 instead of SHA1
  • Support for empty directories

Binary files

While this is still in planning, I plan to heavily optimize OSTree for versioning ELF operating systems. In industry jargon, this would be "content-aware storage".

Trimming history

OSTree will also be optimized to trim intermediate history; in theory one can regenerate binaries from corresponding (git) source code, so we don't need to keep all possible builds over time.

MILESTONE 1

  • Basic pack files (like git)

MILESTONE 2

  • Store checksums as ay
  • Drop version/metadata from tree/dirmeta objects
  • Add index size to superindex, pack size to index
    • So pull can calculate how much we need to download
  • Split pack files into metadata/data
  • pull: Extract all we can from each packfile one at a time, then delete it
  • Restructure repository so that links can be generated as a cache; i.e. objects/raw, pack files are now the canonical
  • For files, checksum combination of metadata variant + raw data
    • i.e. there is only OSTREE_OBJECT_TYPE_FILE (again)

MILESTONE 3

  • Drop archive/raw distinction - archive repositories always generate packfiles per commit
  • Include git packv4 ideas:
    • metadata packfiles have string dictionary (tree filenames and checksums)
    • data packfiles match up similar objects
  • Rolling checksums for partitioning large files? Kernel debuginfo
  • Improved pack clustering
    • file fingerprinting?
  • ELF-x86 aware deltas

Related work in storage

git: http://git-scm.com/ Venti: http://plan9.bell-labs.com/magic/man2html/6/venti Elephant FS: http://www.hpl.hp.com/personal/Alistair_Veitch/papers/elephant-hotos/index.html

Compression

xdelta: http://xdelta.org/ Bsdiff: http://www.daemonology.net/bsdiff/ xz: http://tukaani.org/xz/