From 2794ad524462c4e2ecd4573d650e7b4f8da89a5d Mon Sep 17 00:00:00 2001 From: David Barr Date: Sun, 10 Oct 2010 14:30:15 +1100 Subject: [PATCH] fast-import: Allow filemodify to set the root 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 "" 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 Commit-message-by: Jonathan Nieder Acked-by: Sverre Rabbelier Tested-by: Ramkumar Ramachandra Signed-off-by: Ramkumar Ramachandra Signed-off-by: Junio C Hamano --- Documentation/git-fast-import.txt | 3 +++ fast-import.c | 9 +++++++++ t/t9300-fast-import.sh | 21 +++++++++++++++++++++ 3 files changed, 33 insertions(+) diff --git a/Documentation/git-fast-import.txt b/Documentation/git-fast-import.txt index 966ba4f213..90a46665c9 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 `` shell-style quoting should be used, e.g. `"path/with\n and \" in it"`. +Additionally, in `040000` mode, `` may also be an empty string +(`""`) to specify the root of the tree. + The value of `` 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 2317b0fe75..8f68a89234 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 7c059204e9..3c0cf0509d 100755 --- a/t/t9300-fast-import.sh +++ b/t/t9300-fast-import.sh @@ -874,6 +874,27 @@ test_expect_success \ git diff-tree -C --find-copies-harder -r N4^ N4 >actual && 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 <actual && + compare_diff_raw expect actual' + test_expect_success \ 'N: modify copied tree' \ 'cat >expect <<-\EOF && -- 2.47.1