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720d150c48
I really wanted to try this out, instead of asking for an adjustment to the 'git merge' driver and waiting. For now the new strategy is called 'fredrik' and not in the list of default strategies to be tried. The script wants Python 2.4 so this commit also adjusts Debian and RPM build procecure files. Signed-off-by: Junio C Hamano <junkio@cox.net>
212 lines
4.5 KiB
Bash
Executable file
212 lines
4.5 KiB
Bash
Executable file
#!/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 fredrik stupid octopus'
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all_strategies='fredrik octopus resolve stupid'
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default_strategies='resolve octopus'
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use_strategies=
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dropheads() {
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rm -f -- "$GIT_DIR/MERGE_HEAD" || exit 1
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}
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summary() {
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case "$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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0,*)
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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="$1"
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shift
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head=$(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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die "Unable to find common commit between $head and $*"
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;;
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1,"$1")
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# If head can reach all the merge then we are up to date.
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# but first the most common case of merging one remote
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echo "Already up-to-date. Yeeah!"
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dropheads
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exit 0
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;;
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1,"$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" || exit 1
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git-rev-parse --verify "$1^0" > "$GIT_DIR/HEAD"
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summary "$1"
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dropheads
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exit 0
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;;
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1,*)
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# We are not doing octopus and not fast forward. Need a
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# real merge.
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;;
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*)
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# An octopus. If we can reach all the remote we are up to date.
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up_to_date=t
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for remote
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do
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common_one=$(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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dropheads
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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. Require that the tree matches
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# exactly our head.
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git-update-index --refresh &&
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test '' = "`git-diff-index --cached --name-only $head`" || {
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die "Need real merge but the working tree has local changes."
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}
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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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git reset --hard $head
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}
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echo "Trying merge strategy $strategy..."
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wt_strategy=$strategy
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git-merge-$strategy $common -- $head "$@" || {
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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)
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echo "Committed merge $result_commit, made by $wt_strategy."
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echo $result_commit >"$GIT_DIR/HEAD"
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summary $result_commit
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dropheads
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exit 0
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fi
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# Pick the result from the best strategy and have the user fix it up.
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case "$best_strategy" in
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'')
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git reset --hard $head
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die "No merge strategy handled the merge."
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;;
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"$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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git reset --hard $head
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echo "Using the $best_strategy to prepare resolving by hand."
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git-merge-$best_strategy $common -- $head "$@"
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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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die "Automatic merge failed; fix up by hand"
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