Revert "filter-branch: subdirectory filter needs --full-history"

This reverts commit cfabd6eee1745cfec58cfcb794ce8847e43b888a. I had
implemented it without understanding what --full-history does. Consider
this history:

    C--M--N
   /  /  /
  A--B  /
   \   /
    D-/

where B and C modify a path, X, in the same way so that the result is
identical, and D does not modify it at all. With the path limiter X and
without --full-history this is simplified to

   A--B

i.e. only one of the paths via B or C is chosen. I had assumed that
--full-history would keep both paths like this

    C--M
   /  /
  A--B

removing the path via D; but in fact it keeps the entire history.

Currently, git does not have the capability to simplify to this
intermediary case. However, the other extreme to keep the entire history
is not wanted either in usual cases. I think we can expect that histories
like the above are rare, and in the usual cases we want a simplified
history. So let's remove --full-history again.

(Concerning t7003, subsequent tests depend on what the test case sets up,
so we can't just back out the entire test case.)

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index ea59015baa2507fdc8fe77d1c77ebdb2d5db2fa7..d846cd9c929e290e00da61167a9cb80ce30691eb 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -234,7 +234,7 @@ case "$filter_subdir" in
        ;;
 *)
        git rev-list --reverse --topo-order --default HEAD \
-               --parents --full-history "$@" -- "$filter_subdir"
+               --parents "$@" -- "$filter_subdir"
 esac > ../revs || die "Could not get the commits"
 commits=$(wc -l <../revs | tr -d " ")
 

diff --git a/t/t7003-filter-branch.sh b/t/t7003-filter-branch.sh
index efd658adb6d6327863f430b10ab65aa3f112f996..f126204d49c92fad701bf4e3f292a528b7e27d84 100755 (executable)
--- a/t/t7003-filter-branch.sh
+++ b/t/t7003-filter-branch.sh
@@ -97,7 +97,7 @@ test_expect_success 'subdirectory filter result looks okay' '
        test_must_fail git show sub:subdir
 '
 
-test_expect_success 'setup and filter history that requires --full-history' '
+test_expect_success 'more setup' '
        git checkout master &&
        mkdir subdir &&
        echo A > subdir/new &&
@@ -107,16 +107,7 @@ test_expect_success 'setup and filter history that requires --full-history' '
        git rm a &&
        test_tick &&
        git commit -m "again subdir on master" &&
-       git merge branch &&
-       git branch sub-master &&
-       git-filter-branch -f --subdirectory-filter subdir sub-master
-'
-
-test_expect_success 'subdirectory filter result looks okay' '
-       test 3 = $(git rev-list -1 --parents sub-master | wc -w) &&
-       git show sub-master^:new &&
-       git show sub-master^2:new &&
-       test_must_fail git show sub:subdir
+       git merge branch
 '
 
 test_expect_success 'use index-filter to move into a subdirectory' '