X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=git-merge.sh;h=c258ea78bcd5dc944155b629ef429de247a6bac5;hb=687dd75c95f9212244b6cf4fe60b40db44de01ba;hp=818e6b772d30c060020640deb051f2428e2c9fe5;hpb=e4cf17ce0db2dab7c9525a732f86c5e3df3b4ed0;p=git.git diff --git a/git-merge.sh b/git-merge.sh index 818e6b77..c258ea78 100755 --- a/git-merge.sh +++ b/git-merge.sh @@ -3,29 +3,51 @@ # Copyright (c) 2005 Junio C Hamano # -. git-sh-setup || die "Not a git archive" + +USAGE='[-n] [--no-commit] [-s ]... +' +. git-sh-setup LF=' ' -usage () { - die "git-merge [-n] [-s ]... +" -} +all_strategies='recursive octopus resolve stupid ours' +default_strategies='recursive' +use_strategies= -# all_strategies='resolve recursive stupid octopus' +dropsave() { + rm -f -- "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/MERGE_MSG" \ + "$GIT_DIR/MERGE_SAVE" || exit 1 +} -all_strategies='recursive octopus resolve stupid' -default_strategies='resolve octopus' -use_strategies= +savestate() { + # Stash away any local modifications. + git-diff-index -z --name-only $head | + cpio -0 -o >"$GIT_DIR/MERGE_SAVE" +} -dropheads() { - rm -f -- "$GIT_DIR/MERGE_HEAD" || exit 1 +restorestate() { + if test -f "$GIT_DIR/MERGE_SAVE" + then + git reset --hard $head + cpio -iuv <"$GIT_DIR/MERGE_SAVE" + git-update-index --refresh >/dev/null + fi } -summary() { +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 "$1" | + git-diff-tree -p -M "$head" "$1" | git-apply --stat --summary ;; esac @@ -37,6 +59,8 @@ do -n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\ --no-summa|--no-summar|--no-summary) no_summary=t ;; + --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit) + no_commit=t ;; -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\ --strateg=*|--strategy=*|\ -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy) @@ -62,59 +86,86 @@ do shift done -case "$use_strategies" in -'') - use_strategies=$default_strategies - ;; -esac test "$#" -le 2 && usage ;# we need at least two heads. merge_msg="$1" shift +head_arg="$1" head=$(git-rev-parse --verify "$1"^0) || usage shift # All the rest are remote heads +remoteheads= for remote do - git-rev-parse --verify "$remote"^0 >/dev/null || + remotehead=$(git-rev-parse --verify "$remote"^0) || die "$remote - not something we can merge" + remoteheads="${remoteheads}$remotehead " done +set x $remoteheads ; shift -common=$(git-show-branch --merge-base $head "$@") +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" in -*,'') - die "Unable to find common commit between $head and $*" +case "$#,$common,$no_commit" in +*,'',*) + # No common ancestors found. We need a real merge. ;; -1,"$1") +1,"$1",*) # If head can reach all the merge then we are up to date. # but first the most common case of merging one remote - echo "Already up-to-date. Yeeah!" - dropheads + echo "Already up-to-date." + dropsave exit 0 ;; -1,"$head") +1,"$head",*) # Again the most common case of merging one remote. echo "Updating from $head to $1." git-update-index --refresh 2>/dev/null - git-read-tree -u -m $head "$1" || exit 1 - git-rev-parse --verify "$1^0" > "$GIT_DIR/HEAD" - summary "$1" - dropheads + new_head=$(git-rev-parse --verify "$1^0") && + git-read-tree -u -v -m $head "$new_head" && + finish "$new_head" "Fast forward" + dropsave exit 0 ;; -1,*) +1,?*"$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. + git var GIT_COMMITTER_IDENT >/dev/null || exit + + echo "Trying really trivial in-index merge..." + git-update-index --refresh 2>/dev/null + if git-read-tree --trivial -m -u -v $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 $head $remote) + common_one=$(git-merge-base --all $head $remote) if test "$common_one" != "$remote" then up_to_date=f @@ -124,35 +175,74 @@ case "$#,$common" in if test "$up_to_date" = t then echo "Already up-to-date. Yeeah!" - dropheads + dropsave exit 0 fi ;; esac -# At this point we need a real merge. Require that the tree matches -# exactly our head. +# We are going to make a new commit. +git var GIT_COMMITTER_IDENT >/dev/null || exit -git-update-index --refresh && -test '' = "`git-diff-index --cached --name-only $head`" || { - die "Need real merge but the working tree has local changes." -} +case "$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= +merge_was_ok= for strategy in $use_strategies do test "$wt_strategy" = '' || { echo "Rewinding the tree to pristine..." - git reset --hard $head + restorestate } - echo "Trying merge strategy $strategy..." + case "$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 -- $head "$@" || { + + git-merge-$strategy $common -- "$head_arg" "$@" + exit=$? + if test "$no_commit" = t && test "$exit" = 0 + then + merge_was_ok=t + exit=1 ;# pretend it left conflicts. + fi + + test "$exit" = 0 || { # The backend exits with 1 when conflicts are left to be resolved, # with 2 when it does not handle the given merge at all. - exit=$? if test "$exit" -eq 1 then cnt=`{ @@ -181,32 +271,52 @@ then do parents="$parents -p $remote" done - result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree $parents) - echo "Committed merge $result_commit, made by $wt_strategy." - echo $result_commit >"$GIT_DIR/HEAD" - summary $result_commit - dropheads + result_commit=$(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 '') - git reset --hard $head - die "No merge strategy handled the merge." + restorestate + echo >&2 "No merge strategy handled the merge." + exit 2 ;; "$wt_strategy") # We already have its result in the working tree. ;; *) echo "Rewinding the tree to pristine..." - git reset --hard $head + restorestate echo "Using the $best_strategy to prepare resolving by hand." - git-merge-$best_strategy $common -- $head "$@" + git-merge-$best_strategy $common -- "$head_arg" "$@" ;; esac for remote do echo $remote done >"$GIT_DIR/MERGE_HEAD" -die "Automatic merge failed; fix up by hand" +echo "$merge_msg" >"$GIT_DIR/MERGE_MSG" + +if test "$merge_was_ok" = t +then + echo >&2 \ + "Automatic merge went well; stopped before committing as requested" + exit 0 +else + { + echo ' +Conflicts: +' + git ls-files --unmerged | + sed -e 's/^[^ ]* / /' | + uniq + } >>"$GIT_DIR/MERGE_MSG" + if test -d "$GIT_DIR/rr-cache" + then + git-rerere + fi + die "Automatic merge failed; fix up by hand" +fi