rebase: support -X to pass through strategy options

git-rebase calls out to merge strategies, but did not support merge
strategy options so far.  Add this, in the same style used in
git-merge.

Sadly we have to do the full quoting/eval dance here, since
merge-recursive supports the --subtree=<path> option which potentially
contains whitespace.

This patch does not cover git rebase -i, which does not call any merge
strategy directly except in --preserve-merges, and even then only for
merges.

[jc: with a trivial fix-up for 'expr']

Signed-off-by: Mike Lundy <mike@fluffypenguin.org>
Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt
index be23ad2359b486e4da2ef85962d73cdfed7097fe..b4314568f5a742d186e69b97f782193d2883e6b3 100644 (file)
--- a/Documentation/git-rebase.txt
+++ b/Documentation/git-rebase.txt
@@ -250,6 +250,13 @@ on top of the <upstream> branch using the given strategy, using
 the 'ours' strategy simply discards all patches from the <branch>,
 which makes little sense.
 
+-X <strategy-option>::
+--strategy-option=<strategy-option>::
+       Pass the <strategy-option> through to the merge strategy.
+       This implies `\--merge` and, if no strategy has been
+       specified, `-s recursive`.  Note the reversal of 'ours' and
+       'theirs' as noted in above for the `-m` option.
+
 -q::
 --quiet::
        Be quiet. Implies --no-stat.

diff --git a/git-rebase.sh b/git-rebase.sh
index ab4afa7dee377707484e7f76c7d44ac955f09397..7d1c5c3861f6c3d760ff99a8c3b5a4287edddd34 100755 (executable)
--- a/git-rebase.sh
+++ b/git-rebase.sh
@@ -44,6 +44,7 @@ To restore the original branch and stop rebasing run \"git rebase --abort\".
 "
 unset newbase
 strategy=recursive
+strategy_opts=
 do_merge=
 dotest="$GIT_DIR"/rebase-merge
 prec=4
@@ -112,7 +113,7 @@ call_merge () {
        then
                export GIT_MERGE_VERBOSITY=1
        fi
-       git-merge-$strategy "$cmt^" -- "$hd" "$cmt"
+       eval 'git-merge-$strategy' $strategy_opts '"$cmt^" -- "$hd" "$cmt"'
        rv=$?
        case "$rv" in
        0)
@@ -293,6 +294,27 @@ do
        -M|-m|--m|--me|--mer|--merg|--merge)
                do_merge=t
                ;;
+       -X*|--strategy-option*)
+               case "$#,$1" in
+               1,-X|1,--strategy-option)
+                       usage ;;
+               *,-X|*,--strategy-option)
+                       newopt="$2"
+                       shift ;;
+               *,--strategy-option=*)
+                       newopt="$(expr " $1" : ' --strategy-option=\(.*\)')" ;;
+               *,-X*)
+                       newopt="$(expr " $1" : ' -X\(.*\)')" ;;
+               1,*)
+                       usage ;;
+               esac
+               strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--$newopt")"
+               do_merge=t
+               if test -n "$strategy"
+               then
+                       strategy=recursive
+               fi
+               ;;
        -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
                --strateg=*|--strategy=*|\
        -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)

diff --git a/t/t3402-rebase-merge.sh b/t/t3402-rebase-merge.sh
index 7b7d07269ae35f56dd02a223f350ae0da97bae85..2bea65634a1790ceecf824309c1fbb66250f58d5 100755 (executable)
--- a/t/t3402-rebase-merge.sh
+++ b/t/t3402-rebase-merge.sh
@@ -74,6 +74,15 @@ test_expect_success 'rebase the other way' '
        git rebase --merge side
 '
 
+test_expect_success 'rebase -Xtheirs' '
+       git checkout -b conflicting master~2 &&
+       echo "AB $T" >> original &&
+       git commit -mconflicting original &&
+       git rebase -Xtheirs master &&
+       grep AB original &&
+       ! grep 11 original
+'
+
 test_expect_success 'merge and rebase should match' '
        git diff-tree -r test-rebase test-merge >difference &&
        if test -s difference