git-p4: Unset P4DIFF environment variable when using 'p4 -du diff'
[gitweb.git] / git-merge.sh
index 5ccf28251d51d3ee10675d48cf04829f5d6d8c06..7dbbb1d79dc1d66db3a662045a13554f8d574004 100755 (executable)
@@ -3,7 +3,19 @@
 # Copyright (c) 2005 Junio C Hamano
 #
 
-USAGE='[-n] [--summary] [--no-commit] [--squash] [-s <strategy>] [-m=<merge-message>] <commit>+'
+OPTIONS_KEEPDASHDASH=
+OPTIONS_SPEC="\
+git-merge [options] <remote>...
+git-merge [options] <msg> HEAD <remote>
+--
+summary              show a diffstat at the end of the merge
+n,no-summary         don't show a diffstat at the end of the merge
+squash               create a single commit instead of doing a merge
+commit               perform a commit if the merge sucesses (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
@@ -19,27 +31,29 @@ LF='
 all_strategies='recur recursive octopus resolve stupid ours subtree'
 default_twohead_strategies='recursive'
 default_octopus_strategies='octopus'
-no_trivial_merge_strategies='ours subtree'
+no_fast_forward_strategies='subtree ours'
+no_trivial_strategies='recursive recur subtree ours'
 use_strategies=
 
-index_merge=t
+allow_fast_forward=t
+allow_trivial_merge=t
+squash= no_commit=
 
 dropsave() {
        rm -f -- "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/MERGE_MSG" \
-                "$GIT_DIR/MERGE_SAVE" || exit 1
+                "$GIT_DIR/MERGE_STASH" || exit 1
 }
 
 savestate() {
        # Stash away any local modifications.
-       git diff-index -z --name-only $head |
-       cpio -0 -o >"$GIT_DIR/MERGE_SAVE"
+       git stash create >"$GIT_DIR/MERGE_STASH"
 }
 
 restorestate() {
-        if test -f "$GIT_DIR/MERGE_SAVE"
+        if test -f "$GIT_DIR/MERGE_STASH"
        then
                git reset --hard $head >/dev/null
-               cpio -iuv <"$GIT_DIR/MERGE_SAVE"
+               git stash apply $(cat "$GIT_DIR/MERGE_STASH")
                git update-index --refresh >/dev/null
        fi
 }
@@ -57,7 +71,7 @@ finish_up_to_date () {
 squash_message () {
        echo Squashed commit of the following:
        echo
-       git log --no-merges ^"$head" $remote
+       git log --no-merges --pretty=medium ^"$head" $remoteheads
 }
 
 finish () {
@@ -80,6 +94,7 @@ finish () {
                        ;;
                *)
                        git update-ref -m "$rlogm" HEAD "$1" "$head" || exit 1
+                       git gc --auto
                        ;;
                esac
                ;;
@@ -95,6 +110,19 @@ finish () {
                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 () {
@@ -117,57 +145,68 @@ merge_name () {
        fi
 }
 
-case "$#" in 0) usage ;; esac
-
-have_message=
-while case "$#" in 0) break ;; esac
-do
-       case "$1" in
-       -n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
-               --no-summa|--no-summar|--no-summary)
-               show_diffstat=false ;;
-       --summary)
-               show_diffstat=t ;;
-       --sq|--squ|--squa|--squas|--squash)
-               squash=t no_commit=t ;;
-       --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
-               no_commit=t ;;
-       -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
-               --strateg=*|--strategy=*|\
-       -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
-               case "$#,$1" in
-               *,*=*)
-                       strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
-               1,*)
-                       usage ;;
-               *)
-                       strategy="$2"
-                       shift ;;
-               esac
-               case " $all_strategies " in
-               *" $strategy "*)
-                       use_strategies="$use_strategies$strategy " ;;
-               *)
-                       die "available strategies are: $all_strategies" ;;
+parse_config () {
+       while test $# != 0; do
+               case "$1" in
+               -n|--no-summary)
+                       show_diffstat=false ;;
+               --summary)
+                       show_diffstat=t ;;
+               --squash)
+                       test "$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
-               ;;
-       -m=*|--m=*|--me=*|--mes=*|--mess=*|--messa=*|--messag=*|--message=*)
-               merge_msg=`expr "z$1" : 'z-[^=]*=\(.*\)'`
-               have_message=t
-               ;;
-       -m|--m|--me|--mes|--mess|--messa|--messag|--message)
                shift
-               case "$#" in
-               1)      usage ;;
-               esac
-               merge_msg="$1"
-               have_message=t
-               ;;
-       -*)     usage ;;
-       *)      break ;;
-       esac
-       shift
-done
+       done
+       args_left=$#
+}
+
+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
@@ -265,11 +304,20 @@ esac
 
 for s in $use_strategies
 do
-       for nt in $no_trivial_merge_strategies
+       for ss in $no_fast_forward_strategies
        do
                case " $s " in
-               *" $nt "*)
-                       index_merge=f
+               *" $ss "*)
+                       allow_fast_forward=f
+                       break
+                       ;;
+               esac
+       done
+       for ss in $no_trivial_strategies
+       do
+               case " $s " in
+               *" $ss "*)
+                       allow_trivial_merge=f
                        break
                        ;;
                esac
@@ -286,10 +334,7 @@ case "$#" in
 esac
 echo "$head" >"$GIT_DIR/ORIG_HEAD"
 
-case "$index_merge,$#,$common,$no_commit" in
-f,*)
-       # We've been told not to try anything clever.  Skip to real merge.
-       ;;
+case "$allow_fast_forward,$#,$common,$no_commit" in
 ?,*,'',*)
        # No common ancestors found. We need a real merge.
        ;;
@@ -299,7 +344,7 @@ f,*)
        finish_up_to_date "Already up-to-date."
        exit 0
        ;;
-?,1,"$head",*)
+t,1,"$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
@@ -322,11 +367,8 @@ f,*)
        # We are not doing octopus, not fast forward, and have only
        # one common.
        git update-index --refresh 2>/dev/null
-       case " $use_strategies " in
-       *' recursive '*|*' recur '*)
-               : run merge later
-               ;;
-       *)
+       case "$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..."
@@ -381,7 +423,7 @@ case "$use_strategies" in
     single_strategy=no
     ;;
 *)
-    rm -f "$GIT_DIR/MERGE_SAVE"
+    rm -f "$GIT_DIR/MERGE_STASH"
     single_strategy=yes
     ;;
 esac
@@ -439,7 +481,13 @@ done
 # auto resolved the merge cleanly.
 if test '' != "$result_tree"
 then
-    parents=$(git show-branch --independent "$head" "$@" | sed -e 's/^/-p /')
+    if test "$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