You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
296 lines
6.3 KiB
296 lines
6.3 KiB
#!/bin/sh |
|
# |
|
# Copyright (c) 2005 Junio C Hamano |
|
# |
|
|
|
|
|
USAGE='[-n] [--no-commit] [-s <strategy>]... <merge-message> <head> <remote>+' |
|
. git-sh-setup |
|
|
|
LF=' |
|
' |
|
|
|
all_strategies='recursive octopus resolve stupid ours' |
|
default_strategies='recursive' |
|
use_strategies= |
|
|
|
dropsave() { |
|
rm -f -- "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/MERGE_MSG" \ |
|
"$GIT_DIR/MERGE_SAVE" || exit 1 |
|
} |
|
|
|
savestate() { |
|
# Stash away any local modifications. |
|
git-diff-index -z --name-only $head | |
|
cpio -0 -o >"$GIT_DIR/MERGE_SAVE" |
|
} |
|
|
|
restorestate() { |
|
if test -f "$GIT_DIR/MERGE_SAVE" |
|
then |
|
git reset --hard $head |
|
cpio -iuv <"$GIT_DIR/MERGE_SAVE" |
|
git-update-index --refresh >/dev/null |
|
fi |
|
} |
|
|
|
finish () { |
|
test '' = "$2" || echo "$2" |
|
case "$merge_msg" in |
|
'') |
|
echo "No merge message -- not updating HEAD" |
|
;; |
|
*) |
|
git-update-ref HEAD "$1" "$head" || exit 1 |
|
;; |
|
esac |
|
|
|
case "$no_summary" in |
|
'') |
|
git-diff-tree -p -M "$head" "$1" | |
|
git-apply --stat --summary |
|
;; |
|
esac |
|
} |
|
|
|
while case "$#" in 0) break ;; esac |
|
do |
|
case "$1" in |
|
-n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\ |
|
--no-summa|--no-summar|--no-summary) |
|
no_summary=t ;; |
|
--no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit) |
|
no_commit=t ;; |
|
-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\ |
|
--strateg=*|--strategy=*|\ |
|
-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy) |
|
case "$#,$1" in |
|
*,*=*) |
|
strategy=`expr "$1" : '-[^=]*=\(.*\)'` ;; |
|
1,*) |
|
usage ;; |
|
*) |
|
strategy="$2" |
|
shift ;; |
|
esac |
|
case " $all_strategies " in |
|
*" $strategy "*) |
|
use_strategies="$use_strategies$strategy " ;; |
|
*) |
|
die "available strategies are: $all_strategies" ;; |
|
esac |
|
;; |
|
-*) usage ;; |
|
*) break ;; |
|
esac |
|
shift |
|
done |
|
|
|
test "$#" -le 2 && usage ;# we need at least two heads. |
|
|
|
merge_msg="$1" |
|
shift |
|
head_arg="$1" |
|
head=$(git-rev-parse --verify "$1"^0) || usage |
|
shift |
|
|
|
# All the rest are remote heads |
|
remoteheads= |
|
for remote |
|
do |
|
remotehead=$(git-rev-parse --verify "$remote"^0) || |
|
die "$remote - not something we can merge" |
|
remoteheads="${remoteheads}$remotehead " |
|
done |
|
set x $remoteheads ; shift |
|
|
|
case "$#" in |
|
1) |
|
common=$(git-merge-base --all $head "$@") |
|
;; |
|
*) |
|
common=$(git-show-branch --merge-base $head "$@") |
|
;; |
|
esac |
|
echo "$head" >"$GIT_DIR/ORIG_HEAD" |
|
|
|
case "$#,$common,$no_commit" in |
|
*,'',*) |
|
# No common ancestors found. We need a real merge. |
|
;; |
|
1,"$1",*) |
|
# If head can reach all the merge then we are up to date. |
|
# but first the most common case of merging one remote |
|
echo "Already up-to-date." |
|
dropsave |
|
exit 0 |
|
;; |
|
1,"$head",*) |
|
# Again the most common case of merging one remote. |
|
echo "Updating from $head to $1." |
|
git-update-index --refresh 2>/dev/null |
|
new_head=$(git-rev-parse --verify "$1^0") && |
|
git-read-tree -u -m $head "$new_head" && |
|
finish "$new_head" "Fast forward" |
|
dropsave |
|
exit 0 |
|
;; |
|
1,?*"$LF"?*,*) |
|
# We are not doing octopus and not fast forward. Need a |
|
# real merge. |
|
;; |
|
1,*,) |
|
# We are not doing octopus, not fast forward, and have only |
|
# one common. See if it is really trivial. |
|
echo "Trying really trivial in-index merge..." |
|
git-update-index --refresh 2>/dev/null |
|
if git-read-tree --trivial -m -u $common $head "$1" && |
|
result_tree=$(git-write-tree) |
|
then |
|
echo "Wonderful." |
|
result_commit=$( |
|
echo "$merge_msg" | |
|
git-commit-tree $result_tree -p HEAD -p "$1" |
|
) || exit |
|
finish "$result_commit" "In-index merge" |
|
dropsave |
|
exit 0 |
|
fi |
|
echo "Nope." |
|
;; |
|
*) |
|
# An octopus. If we can reach all the remote we are up to date. |
|
up_to_date=t |
|
for remote |
|
do |
|
common_one=$(git-merge-base --all $head $remote) |
|
if test "$common_one" != "$remote" |
|
then |
|
up_to_date=f |
|
break |
|
fi |
|
done |
|
if test "$up_to_date" = t |
|
then |
|
echo "Already up-to-date. Yeeah!" |
|
dropsave |
|
exit 0 |
|
fi |
|
;; |
|
esac |
|
|
|
case "$use_strategies" in |
|
'') |
|
case "$#" in |
|
1) |
|
use_strategies="$default_strategies" ;; |
|
*) |
|
use_strategies=octopus ;; |
|
esac |
|
;; |
|
esac |
|
|
|
# At this point, we need a real merge. No matter what strategy |
|
# we use, it would operate on the index, possibly affecting the |
|
# working tree, and when resolved cleanly, have the desired tree |
|
# in the index -- this means that the index must be in sync with |
|
# the $head commit. The strategies are responsible to ensure this. |
|
|
|
case "$use_strategies" in |
|
?*' '?*) |
|
# Stash away the local changes so that we can try more than one. |
|
savestate |
|
single_strategy=no |
|
;; |
|
*) |
|
rm -f "$GIT_DIR/MERGE_SAVE" |
|
single_strategy=yes |
|
;; |
|
esac |
|
|
|
result_tree= best_cnt=-1 best_strategy= wt_strategy= |
|
for strategy in $use_strategies |
|
do |
|
test "$wt_strategy" = '' || { |
|
echo "Rewinding the tree to pristine..." |
|
restorestate |
|
} |
|
case "$single_strategy" in |
|
no) |
|
echo "Trying merge strategy $strategy..." |
|
;; |
|
esac |
|
|
|
# Remember which strategy left the state in the working tree |
|
wt_strategy=$strategy |
|
|
|
git-merge-$strategy $common -- "$head_arg" "$@" |
|
exit=$? |
|
if test "$no_commit" = t && test "$exit" = 0 |
|
then |
|
exit=1 ;# pretend it left conflicts. |
|
fi |
|
|
|
test "$exit" = 0 || { |
|
|
|
# The backend exits with 1 when conflicts are left to be resolved, |
|
# with 2 when it does not handle the given merge at all. |
|
|
|
if test "$exit" -eq 1 |
|
then |
|
cnt=`{ |
|
git-diff-files --name-only |
|
git-ls-files --unmerged |
|
} | wc -l` |
|
if test $best_cnt -le 0 -o $cnt -le $best_cnt |
|
then |
|
best_strategy=$strategy |
|
best_cnt=$cnt |
|
fi |
|
fi |
|
continue |
|
} |
|
|
|
# Automerge succeeded. |
|
result_tree=$(git-write-tree) && break |
|
done |
|
|
|
# If we have a resulting tree, that means the strategy module |
|
# auto resolved the merge cleanly. |
|
if test '' != "$result_tree" |
|
then |
|
parents="-p $head" |
|
for remote |
|
do |
|
parents="$parents -p $remote" |
|
done |
|
result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree $parents) || exit |
|
finish "$result_commit" "Merge $result_commit, made by $wt_strategy." |
|
dropsave |
|
exit 0 |
|
fi |
|
|
|
# Pick the result from the best strategy and have the user fix it up. |
|
case "$best_strategy" in |
|
'') |
|
restorestate |
|
echo >&2 "No merge strategy handled the merge." |
|
exit 2 |
|
;; |
|
"$wt_strategy") |
|
# We already have its result in the working tree. |
|
;; |
|
*) |
|
echo "Rewinding the tree to pristine..." |
|
restorestate |
|
echo "Using the $best_strategy to prepare resolving by hand." |
|
git-merge-$best_strategy $common -- "$head_arg" "$@" |
|
;; |
|
esac |
|
for remote |
|
do |
|
echo $remote |
|
done >"$GIT_DIR/MERGE_HEAD" |
|
echo $merge_msg >"$GIT_DIR/MERGE_MSG" |
|
|
|
die "Automatic merge failed/prevented; fix up by hand"
|
|
|