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authorMiklos Vajna <vmiklos@frugalware.org>2008-07-07 17:24:20 (GMT)
committerJunio C Hamano <gitster@pobox.com>2008-07-08 00:50:01 (GMT)
commit1c7b76be7d620bbaf2e6b8417f04012326bbb9df (patch)
tree1245fa311746c7d0c0ec78a7d773a57edb5460a5 /git-merge.sh
parent1c6669351a47c834cceb75d6044a1aae259fc69f (diff)
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Build in merge
Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Miklos Vajna <vmiklos@frugalware.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'git-merge.sh')
-rwxr-xr-xgit-merge.sh554
1 files changed, 0 insertions, 554 deletions
diff --git a/git-merge.sh b/git-merge.sh
deleted file mode 100755
index 8026ccf..0000000
--- a/git-merge.sh
+++ /dev/null
@@ -1,554 +0,0 @@
-#!/bin/sh
-#
-# Copyright (c) 2005 Junio C Hamano
-#
-
-OPTIONS_KEEPDASHDASH=
-OPTIONS_SPEC="\
-git-merge [options] <remote>...
-git-merge [options] <msg> HEAD <remote>
---
-stat show a diffstat at the end of the merge
-n don't show a diffstat at the end of the merge
-summary (synonym to --stat)
-log add list of one-line log to merge commit message
-squash create a single commit instead of doing a merge
-commit perform a commit if the merge succeeds (default)
-ff allow fast forward (default)
-s,strategy= merge strategy to use
-m,message= message to be used for the merge commit (if any)
-"
-
-SUBDIRECTORY_OK=Yes
-. git-sh-setup
-require_work_tree
-cd_to_toplevel
-
-test -z "$(git ls-files -u)" ||
- die "You are in the middle of a conflicted merge."
-
-LF='
-'
-
-all_strategies='recur recursive octopus resolve stupid ours subtree'
-default_twohead_strategies='recursive'
-default_octopus_strategies='octopus'
-no_fast_forward_strategies='subtree ours'
-no_trivial_strategies='recursive recur subtree ours'
-use_strategies=
-
-allow_fast_forward=t
-allow_trivial_merge=t
-squash= no_commit= log_arg=
-
-dropsave() {
- rm -f -- "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/MERGE_MSG" \
- "$GIT_DIR/MERGE_STASH" || exit 1
-}
-
-savestate() {
- # Stash away any local modifications.
- git stash create >"$GIT_DIR/MERGE_STASH"
-}
-
-restorestate() {
- if test -f "$GIT_DIR/MERGE_STASH"
- then
- git reset --hard $head >/dev/null
- git stash apply $(cat "$GIT_DIR/MERGE_STASH")
- git update-index --refresh >/dev/null
- fi
-}
-
-finish_up_to_date () {
- case "$squash" in
- t)
- echo "$1 (nothing to squash)" ;;
- '')
- echo "$1" ;;
- esac
- dropsave
-}
-
-squash_message () {
- echo Squashed commit of the following:
- echo
- git log --no-merges --pretty=medium ^"$head" $remoteheads
-}
-
-finish () {
- if test '' = "$2"
- then
- rlogm="$GIT_REFLOG_ACTION"
- else
- echo "$2"
- rlogm="$GIT_REFLOG_ACTION: $2"
- fi
- case "$squash" in
- t)
- echo "Squash commit -- not updating HEAD"
- squash_message >"$GIT_DIR/SQUASH_MSG"
- ;;
- '')
- case "$merge_msg" in
- '')
- echo "No merge message -- not updating HEAD"
- ;;
- *)
- git update-ref -m "$rlogm" HEAD "$1" "$head" || exit 1
- git gc --auto
- ;;
- esac
- ;;
- esac
- case "$1" in
- '')
- ;;
- ?*)
- if test "$show_diffstat" = t
- then
- # We want color (if set), but no pager
- GIT_PAGER='' git diff --stat --summary -M "$head" "$1"
- fi
- ;;
- esac
-
- # Run a post-merge hook
- if test -x "$GIT_DIR"/hooks/post-merge
- then
- case "$squash" in
- t)
- "$GIT_DIR"/hooks/post-merge 1
- ;;
- '')
- "$GIT_DIR"/hooks/post-merge 0
- ;;
- esac
- fi
-}
-
-merge_name () {
- remote="$1"
- rh=$(git rev-parse --verify "$remote^0" 2>/dev/null) || return
- bh=$(git show-ref -s --verify "refs/heads/$remote" 2>/dev/null)
- if test "$rh" = "$bh"
- then
- echo "$rh branch '$remote' of ."
- elif truname=$(expr "$remote" : '\(.*\)~[1-9][0-9]*$') &&
- git show-ref -q --verify "refs/heads/$truname" 2>/dev/null
- then
- echo "$rh branch '$truname' (early part) of ."
- elif test "$remote" = "FETCH_HEAD" -a -r "$GIT_DIR/FETCH_HEAD"
- then
- sed -e 's/ not-for-merge / /' -e 1q \
- "$GIT_DIR/FETCH_HEAD"
- else
- echo "$rh commit '$remote'"
- fi
-}
-
-parse_config () {
- while test $# != 0; do
- case "$1" in
- -n|--no-stat|--no-summary)
- show_diffstat=false ;;
- --stat|--summary)
- show_diffstat=t ;;
- --log|--no-log)
- log_arg=$1 ;;
- --squash)
- test "$allow_fast_forward" = t ||
- die "You cannot combine --squash with --no-ff."
- squash=t no_commit=t ;;
- --no-squash)
- squash= no_commit= ;;
- --commit)
- no_commit= ;;
- --no-commit)
- no_commit=t ;;
- --ff)
- allow_fast_forward=t ;;
- --no-ff)
- test "$squash" != t ||
- die "You cannot combine --squash with --no-ff."
- allow_fast_forward=f ;;
- -s|--strategy)
- shift
- case " $all_strategies " in
- *" $1 "*)
- use_strategies="$use_strategies$1 " ;;
- *)
- die "available strategies are: $all_strategies" ;;
- esac
- ;;
- -m|--message)
- shift
- merge_msg="$1"
- have_message=t
- ;;
- --)
- shift
- break ;;
- *) usage ;;
- esac
- shift
- done
- args_left=$#
-}
-
-test $# != 0 || usage
-
-have_message=
-
-if branch=$(git-symbolic-ref -q HEAD)
-then
- mergeopts=$(git config "branch.${branch#refs/heads/}.mergeoptions")
- if test -n "$mergeopts"
- then
- parse_config $mergeopts --
- fi
-fi
-
-parse_config "$@"
-while test $args_left -lt $#; do shift; done
-
-if test -z "$show_diffstat"; then
- test "$(git config --bool merge.diffstat)" = false && show_diffstat=false
- test "$(git config --bool merge.stat)" = false && show_diffstat=false
- test -z "$show_diffstat" && show_diffstat=t
-fi
-
-# This could be traditional "merge <msg> HEAD <commit>..." and the
-# way we can tell it is to see if the second token is HEAD, but some
-# people might have misused the interface and used a committish that
-# is the same as HEAD there instead. Traditional format never would
-# have "-m" so it is an additional safety measure to check for it.
-
-if test -z "$have_message" &&
- second_token=$(git rev-parse --verify "$2^0" 2>/dev/null) &&
- head_commit=$(git rev-parse --verify "HEAD" 2>/dev/null) &&
- test "$second_token" = "$head_commit"
-then
- merge_msg="$1"
- shift
- head_arg="$1"
- shift
-elif ! git rev-parse --verify HEAD >/dev/null 2>&1
-then
- # If the merged head is a valid one there is no reason to
- # forbid "git merge" into a branch yet to be born. We do
- # the same for "git pull".
- if test 1 -ne $#
- then
- echo >&2 "Can merge only exactly one commit into empty head"
- exit 1
- fi
-
- rh=$(git rev-parse --verify "$1^0") ||
- die "$1 - not something we can merge"
-
- git update-ref -m "initial pull" HEAD "$rh" "" &&
- git read-tree --reset -u HEAD
- exit
-
-else
- # We are invoked directly as the first-class UI.
- head_arg=HEAD
-
- # All the rest are the commits being merged; prepare
- # the standard merge summary message to be appended to
- # the given message. If remote is invalid we will die
- # later in the common codepath so we discard the error
- # in this loop.
- merge_name=$(for remote
- do
- merge_name "$remote"
- done | git fmt-merge-msg $log_arg
- )
- merge_msg="${merge_msg:+$merge_msg$LF$LF}$merge_name"
-fi
-head=$(git rev-parse --verify "$head_arg"^0) || usage
-
-# All the rest are remote heads
-test "$#" = 0 && usage ;# we need at least one remote head.
-set_reflog_action "merge $*"
-
-remoteheads=
-for remote
-do
- remotehead=$(git rev-parse --verify "$remote"^0 2>/dev/null) ||
- die "$remote - not something we can merge"
- remoteheads="${remoteheads}$remotehead "
- eval GITHEAD_$remotehead='"$remote"'
- export GITHEAD_$remotehead
-done
-set x $remoteheads ; shift
-
-case "$use_strategies" in
-'')
- case "$#" in
- 1)
- var="`git config --get pull.twohead`"
- if test -n "$var"
- then
- use_strategies="$var"
- else
- use_strategies="$default_twohead_strategies"
- fi ;;
- *)
- var="`git config --get pull.octopus`"
- if test -n "$var"
- then
- use_strategies="$var"
- else
- use_strategies="$default_octopus_strategies"
- fi ;;
- esac
- ;;
-esac
-
-for s in $use_strategies
-do
- for ss in $no_fast_forward_strategies
- do
- case " $s " in
- *" $ss "*)
- allow_fast_forward=f
- break
- ;;
- esac
- done
- for ss in $no_trivial_strategies
- do
- case " $s " in
- *" $ss "*)
- allow_trivial_merge=f
- break
- ;;
- esac
- done
-done
-
-case "$#" in
-1)
- common=$(git merge-base --all $head "$@")
- ;;
-*)
- common=$(git show-branch --merge-base $head "$@")
- ;;
-esac
-echo "$head" >"$GIT_DIR/ORIG_HEAD"
-
-case "$allow_fast_forward,$#,$common,$no_commit" in
-?,*,'',*)
- # No common ancestors found. We need a real merge.
- ;;
-?,1,"$1",*)
- # If head can reach all the merge then we are up to date.
- # but first the most common case of merging one remote.
- finish_up_to_date "Already up-to-date."
- exit 0
- ;;
-t,1,"$head",*)
- # Again the most common case of merging one remote.
- echo "Updating $(git rev-parse --short $head)..$(git rev-parse --short $1)"
- git update-index --refresh 2>/dev/null
- msg="Fast forward"
- if test -n "$have_message"
- then
- msg="$msg (no commit created; -m option ignored)"
- fi
- new_head=$(git rev-parse --verify "$1^0") &&
- git read-tree -v -m -u --exclude-per-directory=.gitignore $head "$new_head" &&
- finish "$new_head" "$msg" || exit
- dropsave
- exit 0
- ;;
-?,1,?*"$LF"?*,*)
- # We are not doing octopus and not fast forward. Need a
- # real merge.
- ;;
-?,1,*,)
- # We are not doing octopus, not fast forward, and have only
- # one common.
- git update-index --refresh 2>/dev/null
- case "$allow_trivial_merge" in
- t)
- # See if it is really trivial.
- git var GIT_COMMITTER_IDENT >/dev/null || exit
- echo "Trying really trivial in-index merge..."
- if git read-tree --trivial -m -u -v $common $head "$1" &&
- result_tree=$(git write-tree)
- then
- echo "Wonderful."
- result_commit=$(
- printf '%s\n' "$merge_msg" |
- git commit-tree $result_tree -p HEAD -p "$1"
- ) || exit
- finish "$result_commit" "In-index merge"
- dropsave
- exit 0
- fi
- echo "Nope."
- esac
- ;;
-*)
- # 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
- finish_up_to_date "Already up-to-date. Yeeah!"
- exit 0
- fi
- ;;
-esac
-
-# We are going to make a new commit.
-git var GIT_COMMITTER_IDENT >/dev/null || exit
-
-# 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_STASH"
- 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..."
- 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
- merge_was_ok=t
- exit=1 ;# pretend it left conflicts.
- fi
-
- test "$exit" = 0 || {
-
- # The backend exits with 1 when conflicts are left to be resolved,
- # with 2 when it does not handle the given merge at all.
-
- if test "$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 '' != "$result_tree"
-then
- if test "$allow_fast_forward" = "t"
- then
- parents=$(git show-branch --independent "$head" "$@")
- else
- parents=$(git rev-parse "$head" "$@")
- fi
- parents=$(echo "$parents" | sed -e 's/^/-p /')
- result_commit=$(printf '%s\n' "$merge_msg" | git commit-tree $result_tree $parents) || exit
- finish "$result_commit" "Merge 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
- case "$use_strategies" in
- ?*' '?*)
- echo >&2 "No merge strategy handled the merge."
- ;;
- *)
- echo >&2 "Merge with strategy $use_strategies failed."
- ;;
- esac
- exit 2
- ;;
-"$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" "$@"
- ;;
-esac
-
-if test "$squash" = t
-then
- finish
-else
- for remote
- do
- echo $remote
- done >"$GIT_DIR/MERGE_HEAD"
- printf '%s\n' "$merge_msg" >"$GIT_DIR/MERGE_MSG"
-fi
-
-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"
- git rerere
- die "Automatic merge failed; fix conflicts and then commit the result."
-fi