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Colin Walters 4309b49866 libostree: Add ostree_sysroot_deployment_set_kargs() 
It turns out people sometimes want to be able to change the kernel
arguments.  Add a convenient API to do so for the current deployment.

This will be used by Anaconda.
 		2014-03-19 09:49:55 -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 Add OstreeAsyncProgress, use it for ostree_repo_pull 2013-10-24 14:27:13 -04:00
ostree-async-progress.h Add OstreeAsyncProgress, use it for ostree_repo_pull 2013-10-24 14:27:13 -04:00
ostree-bootconfig-parser.c libostree: Add ostree_bootconfig_parser_clone() 2014-03-19 09:49:55 -04:00
ostree-bootconfig-parser.h libostree: Add ostree_bootconfig_parser_clone() 2014-03-19 09:49:55 -04:00
ostree-bootloader-syslinux.c libostree: Remove g_print() from bootloader code 2014-03-11 13:15:57 -04:00
ostree-bootloader-syslinux.h libostree: Make OstreeBootloader private 2013-09-15 20:26:13 -04:00
ostree-bootloader-uboot.c libostree: Remove g_print() from bootloader code 2014-03-11 13:15:57 -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 upgrade: Refuse chronologically older commits unless --allow-downgrade 2014-02-20 18:25:56 -05:00
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 fetcher: set timeouts on HTTP connections 2014-02-13 11:21:26 -06:00
ostree-fetcher.h libostree: Change synchronous fetching API to return a stream 2013-09-02 14:48:21 -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 Install a shared library 2013-07-26 19:25:07 -04:00
ostree-libarchive-input-stream.h Switch to #pragma once for headers 2013-07-09 18:53:22 -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 checkout: Use fd-relative open of newly created directory 2014-02-27 11:49:49 -05:00
ostree-repo-commit.c Update libgsystem, use it to set dirfd-relative xattrs on symlinks 2014-02-26 16:34:37 -05:00
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 repo-libarchive: Apply commit modifiers to libarchive archives as well 2013-09-09 22:51:43 -04:00
ostree-repo-private.h Initial basic static delta code drop 2014-02-04 10:31:44 -05:00
ostree-repo-prune.c repo: Tweak traversal API 2013-10-09 12:05:56 -04:00
ostree-repo-pull.c libostree: Fix crash if output is not a tty 2014-03-14 21:59:36 -04:00
ostree-repo-refs.c Drop refs/summary 2014-02-09 14:01:27 -05:00
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 libostree: Add API to append a GPG signature 2014-03-14 21:57:48 -04:00
ostree-repo.h libostree: Add API to append a GPG signature 2014-03-14 21:57:48 -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 sysroot: Avoid bad double-free 2013-10-03 18:34:24 -04:00
ostree-sysroot-deploy.c libostree: Add ostree_sysroot_deployment_set_kargs() 2014-03-19 09:49:55 -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.c libostree: Add ostree_sysroot_deployment_set_kargs() 2014-03-19 09:49:55 -04:00
ostree-sysroot.h libostree: Add ostree_sysroot_deployment_set_kargs() 2014-03-19 09:49:55 -04:00
ostree-types.h libostree: Split off SELinux OstreeSePolicy class 2014-02-19 08:43:45 -05:00
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 OstreeAsyncProgress, use it for ostree_repo_pull 2013-10-24 14:27:13 -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/