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Colin Walters 6a5e66b152 pull: Support --mirror option 
There's several use cases for calling into ostree itself to do
mirroring, instead of using bare rsync.  For example, it's a bit more
efficient as it doesn't require syncing the objects/ directory.

https://bugzilla.gnome.org/show_bug.cgi?id=728351
 		2014-06-16 17:14:13 -04:00
..
README-deltas.md Initial basic static delta code drop 2014-02-04 10:31:44 -05:00
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 core: Import bup's "rollsum" code, add a test case 2014-02-04 10:12:56 -05:00
bupsplit.h core: Import bup's "rollsum" code, add a test case 2014-02-04 10:12:56 -05:00
ostree-1.pc.in Install a shared library 2013-07-26 19:25:07 -04:00
ostree-async-progress.c libostree: Add _finish() API to async progress 2014-04-29 10:59:57 -04:00
ostree-async-progress.h libostree: Add _finish() API to async progress 2014-04-29 10:59:57 -04:00
ostree-bootconfig-parser.c deploy: fdatasync() bootloader configuration files 2014-04-11 18:43:27 -04:00
ostree-bootconfig-parser.h libostree: Add ostree_bootconfig_parser_clone() 2014-03-19 09:49:55 -04:00
ostree-bootloader-syslinux.c bootloader: fdatasync() bootloader configuration 2014-04-03 22:32:30 -04:00
ostree-bootloader-syslinux.h libostree: Make OstreeBootloader private 2013-09-15 20:26:13 -04:00
ostree-bootloader-uboot.c bootloader: fdatasync() bootloader configuration 2014-04-03 22:32:30 -04:00
ostree-bootloader-uboot.h libostree: Make OstreeBootloader private 2013-09-15 20:26:13 -04:00
ostree-bootloader.c libostree: Make OstreeBootloader private 2013-09-15 20:26:13 -04:00
ostree-bootloader.h libostree: Make OstreeBootloader private 2013-09-15 20:26:13 -04:00
ostree-chain-input-stream.c libostree: Fix many gtk-doc warnings 2013-08-17 08:41:31 -04:00
ostree-chain-input-stream.h core: Fix all introspection warnings 2013-07-27 10:13:30 -04:00
ostree-checksum-input-stream.c libostree: Fix many gtk-doc warnings 2013-08-17 08:41:31 -04:00
ostree-checksum-input-stream.h Switch to #pragma once for headers 2013-07-09 18:53:22 -04:00
ostree-core-private.h Initial basic static delta code drop 2014-02-04 10:31:44 -05:00
ostree-core.c upgrade: Refuse chronologically older commits unless --allow-downgrade 2014-02-20 18:25:56 -05:00
ostree-core.h Limit metadata to 10 MiB 2014-05-27 14:15:27 -04:00
ostree-deployment.c libostree: Fix ostree_deployment_clone() to also clone bootconfig 2014-03-19 09:49:55 -04:00
ostree-deployment.h libostree: Fix an introspection scanner warning 2013-10-09 12:53:12 -04:00
ostree-diff.c SELinux: Ensure we label /var, and fix /etc merge wrt xattrs 2014-02-02 11:32:52 -05:00
ostree-diff.h SELinux: Ensure we label /var, and fix /etc merge wrt xattrs 2014-02-02 11:32:52 -05:00
ostree-fetcher.c libostree: Make OstreeFetcher explicitly private 2014-06-09 14:04:53 -04:00
ostree-fetcher.h libostree: Make OstreeFetcher explicitly private 2014-06-09 14:04:53 -04:00
ostree-gpg-verifier.c libostree: Add a better error if we fail to read keyring directory 2014-03-14 14:42:46 -04:00
ostree-gpg-verifier.h trivial: Don't include config.h in headers 2013-10-15 15:26:37 -04:00
ostree-kernel-args.c deploy: Rework kernel arguments, add --karg-append to "admin deploy" 2014-01-16 15:07:55 -05:00
ostree-kernel-args.h deploy: Rework kernel arguments, add --karg-append to "admin deploy" 2014-01-16 15:07:55 -05:00
ostree-libarchive-input-stream.c libostree: Make OstreeLibarchiveInputStream explicitly private 2014-06-09 14:04:53 -04:00
ostree-libarchive-input-stream.h libostree: Make OstreeLibarchiveInputStream explicitly private 2014-06-09 14:04:53 -04:00
ostree-linuxfsutil.c libostree: Silently ignore EPERM when setting EXT2_IMMUTABLE_FL 2014-06-09 14:44:17 -04:00
ostree-linuxfsutil.h deploy: Set the immutable bit on the deployment root 2014-06-03 13:41:48 -04:00
ostree-lzma-common.c deltas: Link to liblzma, add internal API to use it 2014-04-29 10:59:57 -04:00
ostree-lzma-common.h deltas: Link to liblzma, add internal API to use it 2014-04-29 10:59:57 -04:00
ostree-lzma-compressor.c deltas: Link to liblzma, add internal API to use it 2014-04-29 10:59:57 -04:00
ostree-lzma-compressor.h deltas: Link to liblzma, add internal API to use it 2014-04-29 10:59:57 -04:00
ostree-lzma-decompressor.c deltas: Link to liblzma, add internal API to use it 2014-04-29 10:59:57 -04:00
ostree-lzma-decompressor.h deltas: Link to liblzma, add internal API to use it 2014-04-29 10:59:57 -04:00
ostree-mutable-tree.c doc: Add OstreeMutableTree, other minor doc updates 2013-09-12 23:53:13 -04:00
ostree-mutable-tree.h Switch to #pragma once for headers 2013-07-09 18:53:22 -04:00
ostree-repo-checkout.c Honor disable_fsync during checkout also 2014-06-04 16:14:46 +02:00
ostree-repo-commit.c Limit metadata to 10 MiB 2014-05-27 14:15:27 -04:00
ostree-repo-file-enumerator.c Install a shared library 2013-07-26 19:25:07 -04:00
ostree-repo-file-enumerator.h Switch to #pragma once for headers 2013-07-09 18:53:22 -04:00
ostree-repo-file.c libostree: Ensure we set standard::type when querying files 2014-01-19 13:19:10 -05:00
ostree-repo-file.h repo-file: Base OstreeRepoFile on trees instead of commits 2013-09-09 22:31:59 -04:00
ostree-repo-libarchive.c libostree: Make OstreeLibarchiveInputStream explicitly private 2014-06-09 14:04:53 -04:00
ostree-repo-private.h repo: Don't require a txn for writing 2014-05-26 18:49:17 -04:00
ostree-repo-prune.c repo: Tweak traversal API 2013-10-09 12:05:56 -04:00
ostree-repo-pull.c pull: Support --mirror option 2014-06-16 17:14:13 -04:00
ostree-repo-refs.c repo: Don't require a txn for writing 2014-05-26 18:49:17 -04:00
ostree-repo-static-delta-compilation.c deltas: Add a timestamp to delta metadata 2014-02-10 09:40:35 -05:00
ostree-repo-static-delta-core.c deltas: Add a timestamp to delta metadata 2014-02-10 09:40:35 -05:00
ostree-repo-static-delta-private.h TODO: update 2014-03-15 19:05:52 -04:00
ostree-repo-static-delta-processing.c Initial basic static delta code drop 2014-02-04 10:31:44 -05:00
ostree-repo-traverse.c repo: Tweak traversal API 2013-10-09 12:05:56 -04:00
ostree-repo.c repo: Support fsync=false configuration 2014-06-05 17:35:50 -04:00
ostree-repo.h pull: Support --mirror option 2014-06-16 17:14:13 -04:00
ostree-sepolicy.c build: Fix build without SELinux 2014-02-20 10:12:53 -05:00
ostree-sepolicy.h libostree: Split off SELinux OstreeSePolicy class 2014-02-19 08:43:45 -05:00
ostree-sysroot-cleanup.c deploy: Set the immutable bit on the deployment root 2014-06-03 13:41:48 -04:00
ostree-sysroot-deploy.c deploy: Set the immutable bit on the deployment root 2014-06-03 13:41:48 -04:00
ostree-sysroot-private.h deploy: Rework kernel arguments, add --karg-append to "admin deploy" 2014-01-16 15:07:55 -05:00
ostree-sysroot-upgrader.c libostree: Add _finish() API to async progress 2014-04-29 10:59:57 -04:00
ostree-sysroot-upgrader.h libostree/upgrader: Add an API to retrieve an origin description 2014-03-25 16:46:39 -04:00
ostree-sysroot.c Move basic commit API into ostree_sysroot_simple_write_deployment() 2014-03-23 11:36:09 -04:00
ostree-sysroot.h Move basic commit API into ostree_sysroot_simple_write_deployment() 2014-03-23 11:36:09 -04:00
ostree-tls-cert-interaction.c libostree: Make OstreeTlsCertInteraction explicitly private 2014-06-09 14:04:53 -04:00
ostree-tls-cert-interaction.h libostree: Make OstreeTlsCertInteraction explicitly private 2014-06-09 14:04:53 -04:00
ostree-types.h Add an OstreeSysrootUpgrader API 2014-03-24 18:08:22 -04:00
ostree-varint.c Initial basic static delta code drop 2014-02-04 10:31:44 -05:00
ostree-varint.h Initial basic static delta code drop 2014-02-04 10:31:44 -05:00
ostree.h Add an OstreeSysrootUpgrader API 2014-03-24 18:08:22 -04:00

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/