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@xxxxxxxxxxxx>
Commit-message-by: Jonathan Nieder <jrnieder@xxxxxxxxx>
Acked-by: Sverre Rabbelier <srabbelier@xxxxxxxxx>
Tested-by: Ramkumar Ramachandra <artagnon@xxxxxxxxx>
Signed-off-by: Ramkumar Ramachandra <artagnon@xxxxxxxxx>
---
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
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