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-rw-r--r--Makefile3
-rwxr-xr-xgit-commit.sh2
-rwxr-xr-xgit-merge-octopus.sh86
-rwxr-xr-xgit-merge-resolve.sh80
-rwxr-xr-xgit-merge.sh212
5 files changed, 381 insertions, 2 deletions
diff --git a/Makefile b/Makefile
index 38f7054..7ef9861 100644
--- a/Makefile
+++ b/Makefile
@@ -73,7 +73,8 @@ SCRIPT_SH = \
git-repack.sh git-request-pull.sh git-reset.sh \
git-resolve.sh git-revert.sh git-sh-setup.sh git-status.sh \
git-tag.sh git-verify-tag.sh git-whatchanged.sh git.sh \
- git-applymbox.sh git-applypatch.sh
+ git-applymbox.sh git-applypatch.sh \
+ git-merge.sh git-merge-resolve.sh git-merge-octopus.sh
SCRIPT_PERL = \
git-archimport.perl git-cvsimport.perl git-relink.perl \
diff --git a/git-commit.sh b/git-commit.sh
index 741444a..d8bfc3c 100755
--- a/git-commit.sh
+++ b/git-commit.sh
@@ -158,7 +158,7 @@ if [ ! -r "$GIT_DIR/HEAD" ]; then
PARENTS=""
else
if [ -f "$GIT_DIR/MERGE_HEAD" ]; then
- PARENTS="-p HEAD -p MERGE_HEAD"
+ PARENTS="-p HEAD "`sed -e 's/^/-p /' "$GIT_DIR/MERGE_HEAD"`
fi
if test "$use_commit" != ""
then
diff --git a/git-merge-octopus.sh b/git-merge-octopus.sh
new file mode 100755
index 0000000..aa1cd2f
--- /dev/null
+++ b/git-merge-octopus.sh
@@ -0,0 +1,86 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Junio C Hamano
+#
+# Resolve two or more trees.
+#
+
+# The first parameters up to -- are merge bases; the rest are heads.
+bases= head= remotes= sep_seen=
+for arg
+do
+ case ",$sep_seen,$head,$arg," in
+ *,--,)
+ sep_seen=yes
+ ;;
+ ,yes,,*)
+ head=$arg
+ ;;
+ ,yes,*)
+ remotes="$remotes$arg "
+ ;;
+ *)
+ bases="$bases$arg "
+ ;;
+ esac
+done
+
+# Reject if this is not an Octopus -- resolve should be used instead.
+case "$remotes" in
+?*' '?*)
+ ;;
+*)
+ exit 2 ;;
+esac
+
+# MRC is the current "merge reference commit"
+# MRT is the current "merge result tree"
+
+MRC=$head MSG= PARENT="-p $head"
+MRT=$(git-write-tree)
+CNT=1 ;# counting our head
+NON_FF_MERGE=0
+for SHA1 in $remotes
+do
+ common=$(git-merge-base $MRC $SHA1) ||
+ die "Unable to find common commit with $SHA1"
+
+ if test "$common" = $SHA1
+ then
+ echo "Already up-to-date with $SHA1"
+ continue
+ fi
+
+ CNT=`expr $CNT + 1`
+ PARENT="$PARENT -p $SHA1"
+
+ if test "$common,$NON_FF_MERGE" = "$MRC,0"
+ then
+ # The first head being merged was a fast-forward.
+ # Advance MRC to the head being merged, and use that
+ # tree as the intermediate result of the merge.
+ # We still need to count this as part of the parent set.
+
+ echo "Fast forwarding to: $SHA1"
+ git-read-tree -u -m $head $SHA1 || exit
+ MRC=$SHA1 MRT=$(git-write-tree)
+ continue
+ fi
+
+ NON_FF_MERGE=1
+
+ echo "Trying simple merge with $SHA1"
+ git-read-tree -u -m $common $MRT $SHA1 || exit 2
+ next=$(git-write-tree 2>/dev/null)
+ if test $? -ne 0
+ then
+ echo "Simple merge did not work, trying automatic merge."
+ git-merge-index -o git-merge-one-file -a ||
+ exit 2 ; # Automatic merge failed; should not be doing Octopus
+ next=$(git-write-tree 2>/dev/null)
+ fi
+ MRC=$common
+ MRT=$next
+done
+
+exit 0
diff --git a/git-merge-resolve.sh b/git-merge-resolve.sh
new file mode 100755
index 0000000..f0a19b4
--- /dev/null
+++ b/git-merge-resolve.sh
@@ -0,0 +1,80 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Linus Torvalds
+#
+# Resolve two trees.
+
+# The first parameters up to -- are merge bases; the rest are heads.
+bases= head= remotes= sep_seen=
+for arg
+do
+ case ",$sep_seen,$head,$arg," in
+ *,--,)
+ sep_seen=yes
+ ;;
+ ,yes,,*)
+ head=$arg
+ ;;
+ ,yes,*)
+ remotes="$remotes$arg "
+ ;;
+ *)
+ bases="$bases$arg "
+ ;;
+ esac
+done
+
+# Give up if we are given more than two remotes -- not handling octopus.
+case "$remotes" in
+?*' '?*)
+ exit 2 ;;
+esac
+
+# Find an optimum merge base if there are more than one candidates.
+case "$bases" in
+?*' '?*)
+ echo "Trying to find the optimum merge base."
+ G=.tmp-index$$
+ best=
+ best_cnt=-1
+ for c in $bases
+ do
+ rm -f $G
+ GIT_INDEX_FILE=$G git-read-tree -m $c $head $remotes \
+ 2>/dev/null || continue
+ # Count the paths that are unmerged.
+ cnt=`GIT_INDEX_FILE=$G git-ls-files --unmerged | wc -l`
+ if test $best_cnt -le 0 -o $cnt -le $best_cnt
+ then
+ best=$c
+ best_cnt=$cnt
+ if test "$best_cnt" -eq 0
+ then
+ # Cannot do any better than all trivial merge.
+ break
+ fi
+ fi
+ done
+ rm -f $G
+ common="$best"
+ ;;
+*)
+ common="$bases"
+ ;;
+esac
+
+git-update-index --refresh 2>/dev/null
+git-read-tree -u -m $common $head $remotes || exit 2
+echo "Trying simple merge."
+if result_tree=$(git-write-tree 2>/dev/null)
+then
+ exit 0
+else
+ echo "Simple merge failed, trying Automatic merge."
+ if git-merge-index -o git-merge-one-file -a
+ then
+ exit 0
+ else
+ exit 1
+ fi
+fi
diff --git a/git-merge.sh b/git-merge.sh
new file mode 100755
index 0000000..9926e45
--- /dev/null
+++ b/git-merge.sh
@@ -0,0 +1,212 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Junio C Hamano
+#
+
+. git-sh-setup || die "Not a git archive"
+
+LF='
+'
+
+usage () {
+ die "git-merge [-n] [-s <strategy>]... <merge-message> <head> <remote>+"
+}
+
+# all_strategies='resolve multibase fredrik octopus'
+
+all_strategies='resolve multibase octopus'
+default_strategies='resolve multibase octopus'
+use_strategies=
+
+dropheads() {
+ rm -f -- "$GIT_DIR/MERGE_HEAD" || exit 1
+}
+
+summary() {
+ case "$no_summary" in
+ '')
+ git-diff-tree -p -M $head "$1" |
+ git-apply --stat --summary
+ ;;
+ esac
+}
+
+while case "$#" in 0) break ;; esac
+do
+ case "$1" in
+ -n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
+ --no-summa|--no-summar|--no-summary)
+ no_summary=t ;;
+ -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
+ --strateg=*|--strategy=*|\
+ -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
+ case "$#,$1" in
+ *,*=*)
+ strategy=`expr "$1" : '-[^=]*=\(.*\)'` ;;
+ 0,*)
+ usage ;;
+ *)
+ strategy="$2"
+ shift ;;
+ esac
+ case " $all_strategies " in
+ *" $strategy "*)
+ use_strategies="$use_strategies$strategy " ;;
+ *)
+ die "available strategies are: $all_strategies" ;;
+ esac
+ ;;
+ -*) usage ;;
+ *) break ;;
+ esac
+ shift
+done
+
+case "$use_strategies" in
+'')
+ use_strategies=$default_strategies
+ ;;
+esac
+test "$#" -le 2 && usage ;# we need at least two heads.
+
+merge_msg="$1"
+shift
+head=$(git-rev-parse --verify "$1"^0) || usage
+shift
+
+# All the rest are remote heads
+for remote
+do
+ git-rev-parse --verify "$remote"^0 >/dev/null ||
+ die "$remote - not something we can merge"
+done
+
+common=$(git-show-branch --merge-base $head "$@")
+echo "$head" >"$GIT_DIR/ORIG_HEAD"
+
+case "$#,$common" in
+*,'')
+ die "Unable to find common commit between $head and $*"
+ ;;
+1,"$1")
+ # If head can reach all the merge then we are up to date.
+ # but first the most common case of merging one remote
+ echo "Already up-to-date. Yeeah!"
+ dropheads
+ exit 0
+ ;;
+1,"$head")
+ # Again the most common case of merging one remote.
+ echo "Updating from $head to $1."
+ git-update-index --refresh 2>/dev/null
+ git-read-tree -u -m $head "$1" || exit 1
+ git-rev-parse --verify "$1^0" > "$GIT_DIR/HEAD"
+ summary "$1"
+ dropheads
+ exit 0
+ ;;
+1,*)
+ # We are not doing octopus and not fast forward. Need a
+ # real merge.
+ ;;
+*)
+ # An octopus. If we can reach all the remote we are up to date.
+ up_to_date=t
+ for remote
+ do
+ common_one=$(git-merge-base $head $remote)
+ if test "$common_one" != "$remote"
+ then
+ up_to_date=f
+ break
+ fi
+ done
+ if test "$up_to_date" = t
+ then
+ echo "Already up-to-date. Yeeah!"
+ dropheads
+ exit 0
+ fi
+ ;;
+esac
+
+# At this point we need a real merge. Require that the tree matches
+# exactly our head.
+
+git-update-index --refresh &&
+test '' = "`git-diff-index --cached --name-only $head`" || {
+ die "Need real merge but the working tree has local changes."
+}
+
+result_tree= best_cnt=-1 best_strategy= wt_strategy=
+for strategy in $use_strategies
+do
+ test "$wt_strategy" = '' || {
+ echo "Rewinding the tree to pristine..."
+ git reset --hard $head
+ }
+ echo "Trying merge strategy $strategy..."
+ wt_strategy=$strategy
+ git-merge-$strategy $common -- $head "$@" || {
+
+ # 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=`{
+ 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)
+ echo "Committed merge $result_commit, made by $wt_strategy."
+ echo $result_commit >"$GIT_DIR/HEAD"
+ summary $result_commit
+ dropheads
+ exit 0
+fi
+
+# Pick the result from the best strategy and have the user fix it up.
+case "$best_strategy" in
+'')
+ git reset --hard $head
+ die "No merge strategy handled the merge."
+ ;;
+"$wt_strategy")
+ # We already have its result in the working tree.
+ ;;
+*)
+ echo "Rewinding the tree to pristine..."
+ git reset --hard $head
+ echo "Using the $best_strategy to prepare resolving by hand."
+ git-merge-$best_strategy $common -- $head "$@"
+ ;;
+esac
+for remote
+do
+ echo $remote
+done >"$GIT_DIR/MERGE_HEAD"
+die "Automatic merge failed; fix up by hand"