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David Barr 8dc6a373d2 fast-import: add 'ls' command 
Lazy fast-import frontend authors that want to rely on the backend to
keep track of the content of the imported trees _almost_ have what
they need in the 'cat-blob' command (v1.7.4-rc0~30^2~3, 2010-11-28).
But it is not quite enough, since

 (1) cat-blob can be used to retrieve the content of files, but
     not their mode, and

 (2) using cat-blob requires the frontend to keep track of a name
     (mark number or object id) for each blob to be retrieved

Introduce an 'ls' command to complement cat-blob and take care of the
remaining needs.  The 'ls' command finds what is at a given path
within a given tree-ish (tag, commit, or tree):

	'ls' SP <dataref> SP <path> LF

or in fast-import's active commit:

	'ls' SP <path> LF

The response is a single line sent through the cat-blob channel,
imitating ls-tree output.  So for example:

	FE> ls :1 Documentation
	gfi> 040000 tree 9e6c2b599341d28a2a375f8207507e0a2a627fe9	Documentation
	FE> ls 9e6c2b599341d28a2a375f8207507e0a2a627fe9 git-fast-import.txt
	gfi> 100644 blob 4f92954396e3f0f97e75b6838a5635b583708870	git-fast-import.txt
	FE> ls :1 RelNotes
	gfi> 120000 blob b942e49944	RelNotes
	FE> cat-blob b942e49944
	gfi> b942e49944 blob 32
	gfi> Documentation/RelNotes/1.7.4.txt

The most interesting parts of the reply are the first word, which is
a 6-digit octal mode (regular file, executable, symlink, directory,
or submodule), and the part from the second space to the tab, which is
a <dataref> that can be used in later cat-blob, ls, and filemodify (M)
commands to refer to the content (blob, tree, or commit) at that path.

If there is nothing there, the response is "missing some/path".

The intent is for this command to be used to read files from the
active commit, so a frontend can apply patches to them, and to copy
files and directories from previous revisions.

For example, proposed updates to svn-fe use this command in place of
its internal representation of the repository directory structure.
This simplifies the frontend a great deal and means support for
resuming an import in a separate fast-import run (i.e., incremental
import) is basically free.

Signed-off-by: David Barr <david.barr@cordelta.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Improved-by: Junio C Hamano <gitster@pobox.com>
Improved-by: Sverre Rabbelier <srabbelier@gmail.com>
2011-02-26 04:57:58 -06:00
..
howto Documentation/merge subtree How-To: fix typo 2011-02-09 14:03:51 -08:00
pt_BR Documentation: update pt-BR 2009-10-01 08:21:35 -04:00
RelNotes Git 1.7.4.1 2011-02-11 14:39:55 -08:00
technical Fix typos in the documentation 2011-01-04 11:23:42 -08:00
.gitattributes
.gitignore Documentation: Avoid use of xmlto --stringparam 2009-12-05 10:03:49 -08:00
asciidoc.conf Merge branch 'jc/maint-doc-em-dash' 2010-09-03 09:43:42 -07:00
blame-options.txt blame-options.txt: Add default value for -M/-C options. 2010-05-07 09:34:59 -07:00
build-docdep.perl
cat-texi.perl
cmd-list.perl
CodingGuidelines Fix typos in the documentation 2011-01-04 11:23:42 -08:00
config.txt Documentation updates for 'GIT_WORK_TREE without GIT_DIR' historical usecase 2011-01-24 10:13:59 -08:00
date-formats.txt Document date formats accepted by parse_date() 2009-12-03 12:41:37 -08:00
diff-format.txt Fix typos in technical documentation. 2010-01-31 10:24:53 -08:00
diff-generate-patch.txt Clarify and extend the "git diff" format documentation 2010-10-19 14:15:30 -07:00
diff-options.txt diff: use "find" instead of "detect" as prefix for long forms of -M and -C 2010-12-10 13:52:05 -08:00
docbook-xsl.css docbook: change css style 2009-04-06 00:27:09 -07:00
docbook.xsl Documentation: set a !DOCTYPE for user manual 2010-08-20 10:53:56 -07:00
everyday.txt everyday.txt: change "tracking branch" to "remote-tracking branch" 2010-11-03 09:19:10 -07:00
fetch-options.txt pull: Document the "--[no-]recurse-submodules" options 2011-02-07 15:19:09 -08:00
fix-texi.perl
git-add.txt Fix typos in the documentation 2011-01-04 11:23:42 -08:00
git-am.txt Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
git-annotate.txt
git-apply.txt Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
git-archimport.txt Martin Langhoff has a new e-mail address 2010-10-06 12:08:48 -07:00
git-archive.txt Merge branch 'maint-1.7.2' into maint 2011-01-10 10:39:28 -08:00
git-bisect-lk2009.txt Documentation: remove stray backslashes from "Fighting regressions" article 2010-08-20 14:16:51 -07:00
git-bisect.txt Documentation: add "Fighting regressions with git bisect" article 2009-11-08 18:29:08 -08:00
git-blame.txt blame: Add option to show author email instead of name 2010-10-19 12:00:28 -07:00
git-branch.txt git-branch.txt: mention --set-upstream as a way to change upstream configuration 2010-11-03 09:20:48 -07:00
git-bundle.txt Fix typos in the documentation 2011-01-04 11:23:42 -08:00
git-cat-file.txt Documentation: gitrevisions is in section 7 2010-10-13 19:10:55 -07:00
git-check-attr.txt
git-check-ref-format.txt Documentation: gitrevisions is in section 7 2010-10-13 19:10:55 -07:00
git-checkout-index.txt Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
git-checkout.txt Change incorrect uses of "remote branch" meaning "remote-tracking" 2010-11-03 09:20:47 -07:00
git-cherry-pick.txt cherry-pick/revert: add support for -X/--strategy-option 2010-12-28 11:27:56 -08:00
git-cherry.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-citool.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-clean.txt Add -e/--exclude to git-clean. 2010-07-20 16:52:53 -07:00
git-clone.txt Merge branch 'jl/clone-recurse-sm-synonym' 2010-11-29 17:52:34 -08:00
git-commit-tree.txt Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
git-commit.txt Documentation: clarify -u<mode> option defaults 2011-02-21 21:48:55 -08:00
git-config.txt Merge remote branch 'remotes/trast-doc/for-next' 2010-01-20 20:28:49 -08:00
git-count-objects.txt
git-cvsexportcommit.txt Martin Langhoff has a new e-mail address 2010-10-06 12:08:48 -07:00
git-cvsimport.txt Documentation: spelling fixes 2010-07-20 16:59:17 -07:00
git-cvsserver.txt Martin Langhoff has a new e-mail address 2010-10-06 12:08:48 -07:00
git-daemon.txt daemon: make --inetd and --detach incompatible 2010-11-04 16:53:52 -07:00
git-describe.txt Change incorrect uses of "remote branch" meaning "remote-tracking" 2010-11-03 09:20:47 -07:00
git-diff-files.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-diff-index.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-diff-tree.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-diff.txt diff: support --cached on unborn branches 2011-02-07 15:04:30 -08:00
git-difftool.txt Merge branch 'maint' 2010-12-16 16:36:03 -08:00
git-fast-export.txt Use angles for placeholders consistently 2010-10-08 12:29:52 -07:00
git-fast-import.txt fast-import: add 'ls' command 2011-02-26 04:57:58 -06:00
git-fetch-pack.txt Documentation: describe --thin more accurately 2010-02-18 17:13:18 -08:00
git-fetch.txt Change "tracking branch" to "remote-tracking branch" 2010-11-03 09:20:41 -07:00
git-filter-branch.txt Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
git-fmt-merge-msg.txt Fix typos in the documentation 2011-01-04 11:23:42 -08:00
git-for-each-ref.txt Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
git-format-patch.txt Merge branch 'maint' 2010-10-13 20:20:09 -07:00
git-fsck-objects.txt
git-fsck.txt fsck docs: remove outdated and useless diagnostic 2010-12-18 22:58:40 -08:00
git-gc.txt Merge branch 'maint' 2010-12-19 17:49:42 -08:00
git-get-tar-commit-id.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-grep.txt Documentation: add missing quotes to "git grep" examples 2010-08-20 14:16:21 -07:00
git-gui.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-hash-object.txt Documentation: spelling fixes 2010-07-20 16:59:17 -07:00
git-help.txt Work around em-dash handling in newer AsciiDoc 2010-08-24 09:48:20 -07:00
git-http-backend.txt Documentation: Clarify support for smart HTTP backend 2010-03-30 16:49:19 -07:00
git-http-fetch.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-http-push.txt Use 'fast-forward' all over the place 2009-10-24 23:50:28 -07:00
git-imap-send.txt Merge branch 'rr/imap-send-unconfuse-from-line' 2010-04-03 12:28:42 -07:00
git-index-pack.txt Use angles for placeholders consistently 2010-10-08 12:29:52 -07:00
git-init-db.txt init-db: migrate to parse-options 2009-07-12 14:36:40 -07:00
git-init.txt Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
git-instaweb.txt Merge branch 'jc/maint-doc-em-dash' 2010-09-03 09:43:42 -07:00
git-log.txt Replace "remote tracking" with "remote-tracking" 2010-11-03 09:19:04 -07:00
git-lost-found.txt
git-ls-files.txt Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
git-ls-remote.txt
git-ls-tree.txt Use angles for placeholders consistently 2010-10-08 12:29:52 -07:00
git-mailinfo.txt git-mailinfo documentation: clarify -u/--encoding 2010-06-13 20:18:23 -07:00
git-mailsplit.txt Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
git-merge-base.txt merge-base --independent to print reduced parent list in a merge 2010-08-18 14:02:03 -07:00
git-merge-file.txt merge-file: add option to select union merge favor 2010-03-02 21:16:45 -08:00
git-merge-index.txt Documentation: remove backslashes in manpage synopses 2010-08-20 14:16:22 -07:00
git-merge-one-file.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-merge-tree.txt
git-merge.txt Merge branch 'jh/notes-merge' 2010-12-08 11:24:12 -08:00
git-mergetool--lib.txt Work around em-dash handling in newer AsciiDoc 2010-08-24 09:48:20 -07:00
git-mergetool.txt Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
git-mktag.txt
git-mktree.txt mktree --batch: build more than one tree object 2009-05-16 10:28:59 -07:00
git-mv.txt UI consistency: allow --force for where -f means force 2009-08-29 14:08:03 -07:00
git-name-rev.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-notes.txt Provide 'git notes get-ref' to easily retrieve current notes ref 2010-11-17 13:23:55 -08:00
git-pack-objects.txt Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
git-pack-redundant.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-pack-refs.txt doc/git-pack-refs: fix two grammar issues 2009-04-05 00:39:37 -07:00
git-parse-remote.txt parse-remote: remove unused functions 2009-06-11 19:50:45 -07:00
git-patch-id.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-peek-remote.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-prune-packed.txt prune-packed: migrate to parse-options 2009-07-10 23:57:21 -07:00
git-prune.txt prune: allow --dry-run for -n and --verbose for -v 2010-08-09 10:13:18 -07:00
git-pull.txt pull: Document the "--[no-]recurse-submodules" options 2011-02-07 15:19:09 -08:00
git-push.txt Documentation: gitrevisions is in section 7 2010-10-13 19:10:55 -07:00
git-quiltimport.txt quiltimport documentation: --dry-run and -n are synonyms 2009-09-13 01:32:49 -07:00
git-read-tree.txt Merge branch 'nd/maint-fix-add-typo-detection' 2010-12-22 14:40:26 -08:00
git-rebase.txt rebase: support --verify 2010-11-23 12:15:43 -08:00
git-receive-pack.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-reflog.txt Documentation: gitrevisions is in section 7 2010-10-13 19:10:55 -07:00
git-relink.txt Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
git-remote-ext.txt Fix typos in the documentation 2011-01-04 11:23:42 -08:00
git-remote-fd.txt Fix typos in the documentation 2011-01-04 11:23:42 -08:00
git-remote-helpers.txt Documentation/remote-helpers: Fix typos and improve language 2010-04-18 13:56:29 -07:00
git-remote.txt Change "tracking branch" to "remote-tracking branch" 2010-11-03 09:20:41 -07:00
git-repack.txt Merge branch 'jk/repack-reuse-object' into maint 2010-11-24 12:45:07 -08:00
git-replace.txt Documentation: format full commands in typewriter font 2010-01-10 13:01:25 +01:00
git-repo-config.txt
git-request-pull.txt request-pull.txt: Document -p option 2010-07-25 21:52:19 -07:00
git-rerere.txt rerere.txt: Document forget subcommand 2010-07-05 11:51:20 -07:00
git-reset.txt Documentation: do not treat reset --keep as a special case 2011-01-21 12:41:14 -08:00
git-rev-list.txt Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
git-rev-parse.txt git-rev-parse.txt: clarify --git-dir 2010-11-29 13:26:00 -08:00
git-revert.txt cherry-pick/revert: add support for -X/--strategy-option 2010-12-28 11:27:56 -08:00
git-rm.txt git-rm.txt: Fix quoting 2010-12-07 13:13:21 -08:00
git-send-email.txt Merge branch 'maint' 2010-12-10 16:36:53 -08:00
git-send-pack.txt Documentation: describe --thin more accurately 2010-02-18 17:13:18 -08:00
git-sh-setup.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-shell.txt shell: Rewrite documentation and improve error message 2010-08-24 10:47:21 -07:00
git-shortlog.txt Remove stray quotes in --pretty and --format documentation 2010-10-08 12:31:07 -07:00
git-show-branch.txt Merge branch 'sn/doc-opt-notation' into maint 2010-10-21 16:26:42 -07:00
git-show-index.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-show-ref.txt git-show-ref.txt: clarify the pattern matching 2010-10-19 14:15:30 -07:00
git-show.txt Documentation: document show -s 2010-11-09 09:42:57 -08:00
git-stage.txt
git-stash.txt detached-stash: update Documentation 2010-08-21 23:51:22 -07:00
git-status.txt Documentation: clarify -u<mode> option defaults 2011-02-21 21:48:55 -08:00
git-stripspace.txt
git-submodule.txt git submodule add: Remove old docs about implicit -f 2010-07-19 11:11:07 -07:00
git-svn.txt git svn: fix the final example in man page 2011-01-07 21:50:11 +00:00
git-symbolic-ref.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-tag.txt git-tag.txt: list all modes in the description 2011-02-15 10:51:08 -08:00
git-tar-tree.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-tools.txt
git-unpack-file.txt
git-unpack-objects.txt
git-update-index.txt Merge branch 'sn/doc-opt-notation' into maint 2010-10-21 16:26:42 -07:00
git-update-ref.txt
git-update-server-info.txt Remove obsolete bug warning in man git-update-server-info 2009-04-25 09:29:38 -07:00
git-upload-archive.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-upload-pack.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-var.txt Fix 'git var' usage synopsis 2010-02-14 18:23:16 -08:00
git-verify-pack.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-verify-tag.txt verify-tag: document --verbose 2010-11-15 10:05:54 -08:00
git-web--browse.txt web--browse: better support for chromium 2010-12-03 14:05:32 -08:00
git-whatchanged.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git-write-tree.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
git.txt Git 1.7.4.1 2011-02-11 14:39:55 -08:00
gitattributes.txt Merge branch 'jn/perl-funcname' 2011-01-13 11:38:05 -08:00
gitcli.txt Update "describe" documentation to match reality 2009-09-22 19:40:05 -07:00
gitcore-tutorial.txt Documentation: gitrevisions is in section 7 2010-10-13 19:10:55 -07:00
gitcvs-migration.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
gitdiffcore.txt gitdiffcore doc: update pickaxe description 2010-08-31 14:28:20 -07:00
gitglossary.txt
githooks.txt Documentation/githooks: post-rewrite-copy-notes never existed 2011-01-10 09:09:02 -08:00
gitignore.txt Documentation: point to related commands from gitignore 2010-11-11 10:57:16 -08:00
gitk.txt Documentation: gitrevisions is in section 7 2010-10-13 19:10:55 -07:00
gitmodules.txt Fix typos in the documentation 2011-01-04 11:23:42 -08:00
gitrepository-layout.txt Documentation: spelling fixes 2010-07-20 16:59:17 -07:00
gitrevisions.txt Documentation: gitrevisions 2010-07-05 13:39:02 -07:00
gittutorial-2.txt Better "Changed but not updated" message in git-status 2010-11-03 09:18:58 -07:00
gittutorial.txt Change remote tracking to remote-tracking in non-trivial places 2010-11-03 09:19:08 -07:00
gitworkflows.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
glossary-content.txt Change "tracking branch" to "remote-tracking branch" 2010-11-03 09:20:41 -07:00
howto-index.sh
i18n.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
install-doc-quick.sh
install-webdoc.sh install-webdoc: keep installed RelNotes-*.txt 2010-09-09 16:17:59 -07:00
mailmap.txt
Makefile docs: default to more modern toolset 2010-11-24 15:13:58 -08:00
manpage-1.72.xsl
manpage-base-url.xsl.in Documentation: Avoid use of xmlto --stringparam 2009-12-05 10:03:49 -08:00
manpage-base.xsl
manpage-bold-literal.xsl
manpage-normal.xsl
manpage-quote-apos.xsl Quote ' as \(aq in manpages 2009-10-22 12:59:50 -07:00
manpage-suppress-sp.xsl
merge-config.txt Fix typos in the documentation 2011-01-04 11:23:42 -08:00
merge-options.txt merge: Make '--log' an integer option for number of shortlog entries 2010-09-09 11:39:20 -07:00
merge-strategies.txt Merge branch 'kb/merge-recursive-rename-threshold' 2010-10-26 21:54:04 -07:00
pretty-formats.txt pretty: Introduce ' ' modifier to add space if non-empty 2010-06-16 14:45:09 -07:00
pretty-options.txt Remove stray quotes in --pretty and --format documentation 2010-10-08 12:31:07 -07:00
pull-fetch-param.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
rev-list-options.txt Merge branch 'mm/phrase-remote-tracking' 2010-11-24 15:55:05 -08:00
revisions.txt Merge branch 'nd/oneline-sha1-name-from-specific-ref' 2010-12-21 14:30:19 -08:00
SubmittingPatches SubmittingPatches: Document some extra tags used in commit messages 2010-10-06 13:45:42 -07:00
urls-remotes.txt Documentation: spell 'git cmd' without dash throughout 2010-01-10 13:01:28 +01:00
urls.txt Documentation: spelling fixes 2010-07-20 16:59:17 -07:00
user-manual.conf
user-manual.txt user-manual: remote-tracking can be checked out, with detached HEAD 2010-11-03 09:20:48 -07:00