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Colin Walters a615d35762 pull: Add --per-object-fsync 
This is the opposite of
https://github.com/ostreedev/ostree/issues/1184

Motivated by OpenShift seeing etcd performance issues during
OS updates: https://github.com/openshift/machine-config-operator/issues/1897

Basically, if we switch to invoking `fsync()` as we go, it makes
ostree performance worse (in my tests, 31s to write 2G versus 7s if we
delay sync) but it avoids *huge* outliers in `fsync()` time for etcd.
 		2020-07-18 14:59:01 +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 libostree-devel.sym: Remove nonexistent stub symbol 2020-06-17 19:38:26 +00:00
libostree-released.sym Release 2020.2 2020-02-21 14:45:49 +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 libostree: Add ostree_async_progress_copy_state() 2019-11-20 12:24:26 -08:00
ostree-async-progress.h libostree: Add ostree_async_progress_copy_state() 2019-11-20 12:24:26 -08:00
ostree-autocleanups.h lib/sign: allow to build with glib version less than 2.44 2020-03-25 15:23:54 +03:00
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 lib/bootconfig-parser: Write BLS fragment fields in a deterministic order 2019-08-29 12:58:43 +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 deploy: support devicetree directory 2020-05-29 19:56:11 +02:00
ostree-bootloader-uboot.h tree-wide: Remove Emacs modelines 2017-09-21 21:38:34 +00:00
ostree-bootloader-zipl.c bootloader: Add a zipl bootloader backend 2019-10-16 14:22:02 +00:00
ostree-bootloader-zipl.h bootloader: Add a zipl bootloader backend 2019-10-16 14:22:02 +00:00
ostree-bootloader.c bootloader: Add a zipl bootloader backend 2019-10-16 14:22:02 +00:00
ostree-bootloader.h bootloader: Add a zipl bootloader backend 2019-10-16 14:22:02 +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 lib: Move internal binding verification API to repo.c 2020-04-17 01:16:51 +00:00
ostree-cmdprivate.h Add concept of "staged" deployment 2018-04-12 14:55:12 +00:00
ostree-core-private.h Merge pull request #1984 from jlebon/pr/supp-groups 2020-02-20 03:07:41 +01:00
ostree-core.c core: Add documentation for ostree_commit_get_timestamp() 2020-06-18 20:57:53 +00:00
ostree-core.h core: Add OSTREE_COMMIT_META_KEY_ARCHITECTURE 2020-06-05 17:52:42 +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: Add support for basic auth 2019-12-02 22:48:33 +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: retry download on G_IO_ERROR_PARTIAL_INPUT 2020-03-19 15:28:08 -07:00
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-dummy.c gpg: add dummy public interface 2019-08-01 02:06:47 +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: Add more specific OstreeGpgError codes 2020-01-24 13:02:17 -07:00
ostree-gpg-verify-result.h lib: Coerce flags enums to GIR bitfields 2020-04-30 15:13:31 -06:00
ostree-impl-system-generator.c Support mounting /sysroot (and /boot) read-only 2019-12-11 15:33:57 +00:00
ostree-kernel-args.c lib/kernel-args: Store kernel args as key/value entries 2019-11-07 23:39:10 -05:00
ostree-kernel-args.h lib/kernel-args: Store kernel args as key/value entries 2019-11-07 23:39:10 -05:00
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 deploy: Avoid trying to change immutable state unnecessarily 2020-02-14 16:37:38 +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/repo: Create repo directories as 0775 2020-02-18 11:26:46 -05:00
ostree-repo-commit.c pull: Add --per-object-fsync 2020-07-18 14:59:01 +00:00
ostree-repo-deprecated.h lib: Squash two gtk-doc warnings 2020-04-04 17:05:56 +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 lib: fix typo in function docs 2020-04-01 23:06:19 +02:00
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 libarchive: Support commit sizes metadata 2020-01-20 20:42:27 -07:00
ostree-repo-private.h pull: Add --per-object-fsync 2020-07-18 14:59:01 +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 signapi: Change API to also return a success message 2020-06-17 00:33:47 +00:00
ostree-repo-pull-verify.c signapi: Change API to also return a success message 2020-06-17 00:33:47 +00:00
ostree-repo-pull.c pull: Add --per-object-fsync 2020-07-18 14:59:01 +00:00
ostree-repo-refs.c lib/repo: Create repo directories as 0775 2020-02-18 11:26:46 -05:00
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 lib/deltas: convert ostree_repo_static_delta_generate to new style 2020-07-03 13:35:39 +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 pull: Add --per-object-fsync 2020-07-18 14:59:01 +00:00
ostree-repo.h lib: Coerce flags enums to GIR bitfields 2020-04-30 15:13:31 -06:00
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-sign-dummy.c signapi: Change API to also return a success message 2020-06-17 00:33:47 +00:00
ostree-sign-dummy.h signapi: Change API to also return a success message 2020-06-17 00:33:47 +00:00
ostree-sign-ed25519.c Merge pull request #2131 from cgwalters/sign-success 2020-06-24 18:24:41 -04:00
ostree-sign-ed25519.h signapi: Change API to also return a success message 2020-06-17 00:33:47 +00:00
ostree-sign.c signapi: Change API to also return a success message 2020-06-17 00:33:47 +00:00
ostree-sign.h signapi: Change API to also return a success message 2020-06-17 00:33:47 +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 Support mounting /sysroot (and /boot) read-only 2019-12-11 15:33:57 +00:00
ostree-sysroot-deploy.c deploy: support devicetree directory 2020-05-29 19:56:11 +02:00
ostree-sysroot-private.h Support mounting /sysroot (and /boot) read-only 2019-12-11 15:33:57 +00:00
ostree-sysroot-upgrader.c lib/upgrader: Pull with `timestamp-check-from-rev` 2020-05-14 15:27:29 -04:00
ostree-sysroot-upgrader.h Add SPDX-License-Identifier to source files 2018-01-30 20:03:42 +00:00
ostree-sysroot.c sysroot: Reorganize sysroot load code a bit 2020-03-31 21:42:21 +00:00
ostree-sysroot.h sysroot: Remove unimplemented ostree_sysroot_lock_with_mount_namespace 2020-06-18 21:19:43 +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/sign: allow to build with glib version less than 2.44 2020-03-25 15:23:54 +03:00

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/