Stephen HabermanIf a user is working on master, and has merged in their feature branch, but now has to "git pull" because master moved, with pull.rebase their feature branch will be flattened into master.
This is because "git pull" currently does not know about rebase's preserve merges flag, which would avoid this behavior, as it would instead replay just the merge commit of the feature branch onto the new master, and not replay each individual commit in the feature branch.
Add a --rebase=preserve option, which will pass along --preserve-merges to rebase.
Also add 'preserve' to the allowed values for the pull.rebase config setting.
Signed-off-by: Stephen Haberman <stephen@exigencecorp.com> --- Hi,
This is v5 of my --rebase=preserve patch, the last discussion of which was here:
http://thread.gmane.org/gmane.comp.version-control.git/232156
This update has two small changes:
* Change the usage output to match Junio's suggestion, and
* Respect existing true-but-not-"true" values of pull.rebase, using Junio's bool_or_string_config function (with a test for pull.rebase=1).
Thanks!
Documentation/config.txt | 8 +++++ Documentation/git-pull.txt | 18 ++++++---- git-pull.sh | 31 +++++++++++++--- t/t5520-pull.sh | 89 ++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 135 insertions(+), 11 deletions(-)
Show changes to 4 files +135 −10
Documentation/config.txt, Documentation/git-pull.txt, git-pull.sh, t/t5520-pull.sh
diff --git a/Documentation/config.txt b/Documentation/config.txt index ec57a15..4c22be2 100644 --- a/Documentation/config.txt +++ b/Documentation/config.txt @@ -766,6 +766,10 @@ branch.<name>.rebase:: "git pull" is run. See "pull.rebase" for doing this in a non branch-specific manner. + + When preserve, also pass `--preserve-merges` along to 'git rebase' + so that locally committed merge commits will not be flattened + by running 'git pull'. ++ *NOTE*: this is a possibly dangerous operation; do *not* use it unless you understand the implications (see linkgit:git-rebase[1] for details). @@ -1826,6 +1830,10 @@ pull.rebase:: pull" is run. See "branch.<name>.rebase" for setting this on a per-branch basis. + + When preserve, also pass `--preserve-merges` along to 'git rebase' + so that locally committed merge commits will not be flattened + by running 'git pull'. ++ *NOTE*: this is a possibly dangerous operation; do *not* use it unless you understand the implications (see linkgit:git-rebase[1] for details). diff --git a/Documentation/git-pull.txt b/Documentation/git-pull.txt index 6ef8d59..beea10b 100644 --- a/Documentation/git-pull.txt +++ b/Documentation/git-pull.txt @@ -102,12 +102,18 @@ include::merge-options.txt[] :git-pull: 1 -r:: ---rebase:: - Rebase the current branch on top of the upstream branch after - fetching. If there is a remote-tracking branch corresponding to - the upstream branch and the upstream branch was rebased since last - fetched, the rebase uses that information to avoid rebasing - non-local changes. +--rebase[=false|true|preserve]:: + When true, rebase the current branch on top of the upstream + branch after fetching. If there is a remote-tracking branch + corresponding to the upstream branch and the upstream branch + was rebased since last fetched, the rebase uses that information + to avoid rebasing non-local changes. ++ +When preserve, also rebase the current branch on top of the upstream +branch, but pass `--preserve-merges` along to `git rebase` so that +locally created merge commits will not be flattened. ++ +When false, merge the current branch into the upstream branch. + See `pull.rebase`, `branch.<name>.rebase` and `branch.autosetuprebase` in linkgit:git-config[1] if you want to make `git pull` always use diff --git a/git-pull.sh b/git-pull.sh index f0df41c..e11d9a0 100755 --- a/git-pull.sh +++ b/git-pull.sh @@ -4,7 +4,7 @@ # # Fetch one or more remote refs and merge it/them into the current HEAD. -USAGE='[-n | --no-stat] [--[no-]commit] [--[no-]squash] [--[no-]ff] [-s strategy]... [<fetch-options>] <repo> <head>...' +USAGE='[-n | --no-stat] [--[no-]commit] [--[no-]squash] [--[no-]ff] [--[no-]rebase|--rebase=preserve] [-s strategy]... [<fetch-options>] <repo> <head>...' LONG_USAGE='Fetch one or more remote refs and integrate it/them with the current HEAD.' SUBDIRECTORY_OK=Yes OPTIONS_SPEC= @@ -38,15 +38,19 @@ Please, commit your changes before you can merge.")" test -z "$(git ls-files -u)" || die_conflict test -f "$GIT_DIR/MERGE_HEAD" && die_merge +bool_or_string_config () { + git config --bool "$1" 2>/dev/null || git config "$1" +} + strategy_args= diffstat= no_commit= squash= no_ff= ff_only= log_arg= verbosity= progress= recurse_submodules= verify_signatures= -merge_args= edit= +merge_args= edit= rebase_args= curr_branch=$(git symbolic-ref -q HEAD) curr_branch_short="${curr_branch#refs/heads/}" -rebase=$(git config --bool branch.$curr_branch_short.rebase) +rebase=$(bool_or_string_config branch.$curr_branch_short.rebase) if test -z "$rebase" then - rebase=$(git config --bool pull.rebase) + rebase=$(bool_or_string_config pull.rebase) fi dry_run= while : @@ -110,6 +114,9 @@ do esac merge_args="$merge_args$xx " ;; + -r=*|--r=*|--re=*|--reb=*|--reba=*|--rebas=*|--rebase=*) + rebase="${1#*=}" + ;; -r|--r|--re|--reb|--reba|--rebas|--rebase) rebase=true ;; @@ -145,6 +152,20 @@ do shift done +case "$rebase" in +preserve) + rebase=true + rebase_args=--preserve-merges + ;; +true|false|'') + ;; +*) + echo "Invalid value for --rebase, should be true, false, or preserve" + usage + exit 1 + ;; +esac + error_on_no_merge_candidates () { exec >&2 for opt @@ -292,7 +313,7 @@ fi merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit case "$rebase" in true) - eval="git-rebase $diffstat $strategy_args $merge_args $verbosity" + eval="git-rebase $diffstat $strategy_args $merge_args $rebase_args $verbosity" eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}" ;; *) diff --git a/t/t5520-pull.sh b/t/t5520-pull.sh index ed4d9c8..227d293 100755 --- a/t/t5520-pull.sh +++ b/t/t5520-pull.sh @@ -148,6 +148,95 @@ test_expect_success 'branch.to-rebase.rebase should override pull.rebase' ' test new = $(git show HEAD:file2) ' +# add a feature branch, keep-merge, that is merged into master, so the +# test can try preserving the merge commit (or not) with various +# --rebase flags/pull.rebase settings. +test_expect_success 'preserve merge setup' ' + git reset --hard before-rebase && + git checkout -b keep-merge second^ && + test_commit file3 && + git checkout to-rebase && + git merge keep-merge && + git tag before-preserve-rebase +' + +test_expect_success 'pull.rebase=false create a new merge commit' ' + git reset --hard before-preserve-rebase && + test_config pull.rebase false && + git pull . copy && + test $(git rev-parse HEAD^1) = $(git rev-parse before-preserve-rebase) && + test $(git rev-parse HEAD^2) = $(git rev-parse copy) && + test file3 = $(git show HEAD:file3.t) +' + +test_expect_success 'pull.rebase=true flattens keep-merge' ' + git reset --hard before-preserve-rebase && + test_config pull.rebase true && + git pull . copy && + test $(git rev-parse HEAD^^) = $(git rev-parse copy) && + test file3 = $(git show HEAD:file3.t) +' + +test_expect_success 'pull.rebase=1 is treated as true and flattens keep-merge' ' + git reset --hard before-preserve-rebase && + test_config pull.rebase 1 && + git pull . copy && + test $(git rev-parse HEAD^^) = $(git rev-parse copy) && + test file3 = $(git show HEAD:file3.t) +' + +test_expect_success 'pull.rebase=preserve rebases and merges keep-merge' ' + git reset --hard before-preserve-rebase && + test_config pull.rebase preserve && + git pull . copy && + test $(git rev-parse HEAD^^) = $(git rev-parse copy) && + test $(git rev-parse HEAD^2) = $(git rev-parse keep-merge) +' + +test_expect_success 'pull.rebase=invalid fails' ' + git reset --hard before-preserve-rebase && + test_config pull.rebase invalid && + ! git pull . copy +' + +test_expect_success '--rebase=false create a new merge commit' ' + git reset --hard before-preserve-rebase && + test_config pull.rebase true && + git pull --rebase=false . copy && + test $(git rev-parse HEAD^1) = $(git rev-parse before-preserve-rebase) && + test $(git rev-parse HEAD^2) = $(git rev-parse copy) && + test file3 = $(git show HEAD:file3.t) +' + +test_expect_success '--rebase=true rebases and flattens keep-merge' ' + git reset --hard before-preserve-rebase && + test_config pull.rebase preserve && + git pull --rebase=true . copy && + test $(git rev-parse HEAD^^) = $(git rev-parse copy) && + test file3 = $(git show HEAD:file3.t) +' + +test_expect_success '--rebase=preserve rebases and merges keep-merge' ' + git reset --hard before-preserve-rebase && + test_config pull.rebase true && + git pull --rebase=preserve . copy && + test $(git rev-parse HEAD^^) = $(git rev-parse copy) && + test $(git rev-parse HEAD^2) = $(git rev-parse keep-merge) +' + +test_expect_success '--rebase=invalid fails' ' + git reset --hard before-preserve-rebase && + ! git pull --rebase=invalid . copy +' + +test_expect_success '--rebase overrides pull.rebase=preserve and flattens keep-merge' ' + git reset --hard before-preserve-rebase && + test_config pull.rebase preserve && + git pull --rebase . copy && + test $(git rev-parse HEAD^^) = $(git rev-parse copy) && + test file3 = $(git show HEAD:file3.t) +' + test_expect_success '--rebase with rebased upstream' ' git remote add -f me . &&
-- 1.8.1.2