[PATCH] fast-import: Allow filemodify to set the root
- From
David Barr <david.barr@cordelta.com>
- Date
- Oct 10, 2010, 03:30 UTC
- Message-ID
- <1286681415-1831-1-git-send-email-david.barr@cordelta.com>
- In-Reply-To
- <AANLkTinsnMRyoeGzCn1Rkk7tc+zwVa5j3AGqVZCdDGDv@mail.gmail.com>
v1.7.3-rc0~75^2 (Teach fast-import to import subtrees named by tree id, 2010-06-30) has a shortcoming - it doesn't allow the root to be set. Extend this behaviour by allowing the root to be referenced as the empty path, "".
For a command (like filter-branch --subdirectory-filter) that wants to commit a lot of trees that already exist in the object db, writing undeltified objects as loose files only to repack them later can involve a significant amount of overhead. (23% slow-down observed on Linux 2.6.35, worse on Mac OS X 10.6)
Fortunately we have fast-import (which is one of the only git commands that will write to a pack directly) but there is not an advertised way to tell fast-import to commit a given tree without unpacking it.
This patch changes that, by allowing
M 040000 <tree id> ""
as a filemodify line in a commit to reset to a particular tree without any need to parse it. For example,
M 040000 4b825dc642cb6eb9a060e54bf8d69288fbee4904 ""
is a synonym for the deleteall command and the fast-import equivalent of
git read-tree 4b825dc642cb6eb9a060e54bf8d69288fbee4904
Signed-off-by: David Barr <david.barr@cordelta.com> Commit-message-by: Jonathan Nieder <jrnieder@gmail.com> Acked-by: Sverre Rabbelier <srabbelier@gmail.com> Tested-by: Ramkumar Ramachandra <artagnon@gmail.com> Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com> --- Documentation/git-fast-import.txt | 3 +++ fast-import.c | 9 +++++++++ t/t9300-fast-import.sh | 21 +++++++++++++++++++++ 3 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/Documentation/git-fast-import.txt b/Documentation/git-fast-import.txt index 966ba4f..90a4666 100644 --- a/Documentation/git-fast-import.txt +++ b/Documentation/git-fast-import.txt @@ -524,6 +524,9 @@ start with double quote (`"`). If an `LF` or double quote must be encoded into `<path>` shell-style quoting should be used, e.g. `"path/with\n and \" in it"`. +Additionally, in `040000` mode, `<path>` may also be an empty string +(`""`) to specify the root of the tree. + The value of `<path>` must be in canonical form. That is it must not: * contain an empty directory component (e.g. `foo//bar` is invalid), diff --git a/fast-import.c b/fast-import.c index 2317b0f..8f68a89 100644 --- a/fast-import.c +++ b/fast-import.c @@ -1454,6 +1454,15 @@ static int tree_content_set( n = slash1 - p; else n = strlen(p); + if (!slash1 && !n) { + if (!S_ISDIR(mode)) + die("Root cannot be a non-directory"); + hashcpy(root->versions[1].sha1, sha1); + if (root->tree) + release_tree_content_recursive(root->tree); + root->tree = subtree; + return 1; + } if (!n) die("Empty path component found in input"); if (!slash1 && !S_ISDIR(mode) && subtree) diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh index 7c05920..3c0cf05 100755 --- a/t/t9300-fast-import.sh +++ b/t/t9300-fast-import.sh @@ -875,6 +875,27 @@ test_expect_success \ compare_diff_raw expect actual' test_expect_success \ + 'N: copy root directory by tree hash' \ + 'cat >expect <<-\EOF && + :100755 000000 f1fb5da718392694d0076d677d6d0e364c79b0bc 0000000000000000000000000000000000000000 D file3/newf + :100644 000000 7123f7f44e39be127c5eb701e5968176ee9d78b1 0000000000000000000000000000000000000000 D file3/oldf + EOF + root=$(git rev-parse refs/heads/branch^0^{tree}) && + cat >input <<-INPUT_END && + commit refs/heads/N6 + committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> $GIT_COMMITTER_DATE + data <<COMMIT + copy root directory by tree hash + COMMIT + + from refs/heads/branch^0 + M 040000 $root "" + INPUT_END + git fast-import <input && + git diff-tree -C --find-copies-harder -r N4 N6 >actual && + compare_diff_raw expect actual' + +test_expect_success \ 'N: modify copied tree' \ 'cat >expect <<-\EOF && :100644 100644 fcf778cda181eaa1cbc9e9ce3a2e15ee9f9fe791 fcf778cda181eaa1cbc9e9ce3a2e15ee9f9fe791 C100 newdir/interesting file3/file5
-- 1.7.3