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