fast-export and fast-import can easily handle the simple rewrite that
was being done by filter-branch, and should be significantly faster on
systems with a slow fork. Timings from before and after on two laptops
that I have access to (measured via `time ./t3427-rebase-subtree.sh`,
i.e. including everything in this test -- not just the filter-branch or
fast-export/fast-import pair):
Linux: 4.305s -> 3.684s (~17% speedup)
Mac: 10.128s -> 7.038s (~30% speedup)
Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
---
t/t3427-rebase-subtree.sh | 32 ++++++++++++++++++++++++--------
1 file changed, 24 insertions(+), 8 deletions(-)
diff --git a/t/t3427-rebase-subtree.sh b/t/t3427-rebase-subtree.sh
index d8640522a0..d05fcce5dc 100755
--- a/t/t3427-rebase-subtree.sh
+++ b/t/t3427-rebase-subtree.sh
@@ -42,7 +42,9 @@ test_expect_failure REBASE_P \
'Rebase -Xsubtree --preserve-merges --onto commit 4' '
reset_rebase &&
git checkout -b rebase-preserve-merges-4 master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
+ git fast-export --no-data HEAD -- files_subtree/ \
+ | sed -e "s%\([0-9a-f]\{40\} \)files_subtree/%\1%" \
+ | git fast-import --force --quiet &&
git commit -m "Empty commit" --allow-empty &&
git rebase -Xsubtree=files_subtree --preserve-merges --onto files-master master &&
verbose test "$(commit_message HEAD~)" = "files_subtree/master4"
@@ -53,7 +55,9 @@ test_expect_failure REBASE_P \
'Rebase -Xsubtree --preserve-merges --onto commit 5' '
reset_rebase &&
git checkout -b rebase-preserve-merges-5 master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
+ git fast-export --no-data HEAD -- files_subtree/ \
+ | sed -e "s%\([0-9a-f]\{40\} \)files_subtree/%\1%" \
+ | git fast-import --force --quiet &&
git commit -m "Empty commit" --allow-empty &&
git rebase -Xsubtree=files_subtree --preserve-merges --onto files-master master &&
verbose test "$(commit_message HEAD)" = "files_subtree/master5"
@@ -64,7 +68,9 @@ test_expect_failure REBASE_P \
'Rebase -Xsubtree --keep-empty --preserve-merges --onto commit 4' '
reset_rebase &&
git checkout -b rebase-keep-empty-4 master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
+ git fast-export --no-data HEAD -- files_subtree/ \
+ | sed -e "s%\([0-9a-f]\{40\} \)files_subtree/%\1%" \
+ | git fast-import --force --quiet &&
git commit -m "Empty commit" --allow-empty &&
git rebase -Xsubtree=files_subtree --keep-empty --preserve-merges --onto files-master master &&
verbose test "$(commit_message HEAD~2)" = "files_subtree/master4"
@@ -75,7 +81,9 @@ test_expect_failure REBASE_P \
'Rebase -Xsubtree --keep-empty --preserve-merges --onto commit 5' '
reset_rebase &&
git checkout -b rebase-keep-empty-5 master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
+ git fast-export --no-data HEAD -- files_subtree/ \
+ | sed -e "s%\([0-9a-f]\{40\} \)files_subtree/%\1%" \
+ | git fast-import --force --quiet &&
git commit -m "Empty commit" --allow-empty &&
git rebase -Xsubtree=files_subtree --keep-empty --preserve-merges --onto files-master master &&
verbose test "$(commit_message HEAD~)" = "files_subtree/master5"
@@ -86,7 +94,9 @@ test_expect_failure REBASE_P \
'Rebase -Xsubtree --keep-empty --preserve-merges --onto empty commit' '
reset_rebase &&
git checkout -b rebase-keep-empty-empty master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
+ git fast-export --no-data HEAD -- files_subtree/ \
+ | sed -e "s%\([0-9a-f]\{40\} \)files_subtree/%\1%" \
+ | git fast-import --force --quiet &&
git commit -m "Empty commit" --allow-empty &&
git rebase -Xsubtree=files_subtree --keep-empty --preserve-merges --onto files-master master &&
verbose test "$(commit_message HEAD)" = "Empty commit"
@@ -96,7 +106,9 @@ test_expect_failure REBASE_P \
test_expect_failure 'Rebase -Xsubtree --onto commit 4' '
reset_rebase &&
git checkout -b rebase-onto-4 master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
+ git fast-export --no-data HEAD -- files_subtree/ \
+ | sed -e "s%\([0-9a-f]\{40\} \)files_subtree/%\1%" \
+ | git fast-import --force --quiet &&
git commit -m "Empty commit" --allow-empty &&
git rebase -Xsubtree=files_subtree --onto files-master master &&
verbose test "$(commit_message HEAD~2)" = "files_subtree/master4"
@@ -106,7 +118,9 @@ test_expect_failure 'Rebase -Xsubtree --onto commit 4' '
test_expect_failure 'Rebase -Xsubtree --onto commit 5' '
reset_rebase &&
git checkout -b rebase-onto-5 master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
+ git fast-export --no-data HEAD -- files_subtree/ \
+ | sed -e "s%\([0-9a-f]\{40\} \)files_subtree/%\1%" \
+ | git fast-import --force --quiet &&
git commit -m "Empty commit" --allow-empty &&
git rebase -Xsubtree=files_subtree --onto files-master master &&
verbose test "$(commit_message HEAD~)" = "files_subtree/master5"
@@ -115,7 +129,9 @@ test_expect_failure 'Rebase -Xsubtree --onto commit 5' '
test_expect_failure 'Rebase -Xsubtree --onto empty commit' '
reset_rebase &&
git checkout -b rebase-onto-empty master &&
- git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
+ git fast-export --no-data HEAD -- files_subtree/ \
+ | sed -e "s%\([0-9a-f]\{40\} \)files_subtree/%\1%" \
+ | git fast-import --force --quiet &&
git commit -m "Empty commit" --allow-empty &&
git rebase -Xsubtree=files_subtree --onto files-master master &&
verbose test "$(commit_message HEAD)" = "Empty commit"
--
2.23.0.5.g775ebaa2a0
