Update shell scripts to compute empty tree object ID
[gitweb.git] / git-rebase--interactive.sh
index 331c8dfeac3cac2fd2d9d9287d5c487669fe80a0..cc873d630d1f4ad07190327a80763467f7193244 100644 (file)
@@ -81,6 +81,8 @@ rewritten_pending="$state_dir"/rewritten-pending
 # and leaves CR at the end instead.
 cr=$(printf "\015")
 
+empty_tree=$(git hash-object -t tree /dev/null)
+
 strategy_args=${strategy:+--strategy=$strategy}
 test -n "$strategy_opts" &&
 eval '
@@ -238,7 +240,7 @@ is_empty_commit() {
                die "$(eval_gettext "\$sha1: not a commit that can be picked")"
        }
        ptree=$(git rev-parse -q --verify "$1"^^{tree} 2>/dev/null) ||
-               ptree=4b825dc642cb6eb9a060e54bf8d69288fbee4904
+               ptree=$empty_tree
        test "$tree" = "$ptree"
 }
 
@@ -307,17 +309,14 @@ pick_one_preserving_merges () {
        esac
        sha1=$(git rev-parse $sha1)
 
-       if test -f "$state_dir"/current-commit
+       if test -f "$state_dir"/current-commit && test "$fast_forward" = t
        then
-               if test "$fast_forward" = t
-               then
-                       while read current_commit
-                       do
-                               git rev-parse HEAD > "$rewritten"/$current_commit
-                       done <"$state_dir"/current-commit
-                       rm "$state_dir"/current-commit ||
-                               die "$(gettext "Cannot write current commit's replacement sha1")"
-               fi
+               while read current_commit
+               do
+                       git rev-parse HEAD > "$rewritten"/$current_commit
+               done <"$state_dir"/current-commit
+               rm "$state_dir"/current-commit ||
+                       die "$(gettext "Cannot write current commit's replacement sha1")"
        fi
 
        echo $sha1 >> "$state_dir"/current-commit
@@ -743,37 +742,39 @@ get_missing_commit_check_level () {
        printf '%s' "$check_level" | tr 'A-Z' 'a-z'
 }
 
-# The whole contents of this file is run by dot-sourcing it from
-# inside a shell function.  It used to be that "return"s we see
-# below were not inside any function, and expected to return
-# to the function that dot-sourced us.
+# Initiate an action. If the cannot be any
+# further action it  may exec a command
+# or exit and not return.
 #
-# However, older (9.x) versions of FreeBSD /bin/sh misbehave on such a
-# construct and continue to run the statements that follow such a "return".
-# As a work-around, we introduce an extra layer of a function
-# here, and immediately call it after defining it.
-git_rebase__interactive () {
-
-case "$action" in
-continue)
-       if test ! -d "$rewritten"
-       then
-               exec git rebase--helper ${force_rebase:+--no-ff} $allow_empty_message \
-                       --continue
-       fi
-       # do we have anything to commit?
-       if git diff-index --cached --quiet HEAD --
-       then
-               # Nothing to commit -- skip this commit
-
-               test ! -f "$GIT_DIR"/CHERRY_PICK_HEAD ||
-               rm "$GIT_DIR"/CHERRY_PICK_HEAD ||
-               die "$(gettext "Could not remove CHERRY_PICK_HEAD")"
-       else
-               if ! test -f "$author_script"
+# TODO: Consider a cleaner return model so it
+# never exits and always return 0 if process
+# is complete.
+#
+# Parameter 1 is the action to initiate.
+#
+# Returns 0 if the action was able to complete
+# and if 1 if further processing is required.
+initiate_action () {
+       case "$1" in
+       continue)
+               if test ! -d "$rewritten"
+               then
+                       exec git rebase--helper ${force_rebase:+--no-ff} $allow_empty_message \
+                               --continue
+               fi
+               # do we have anything to commit?
+               if git diff-index --cached --quiet HEAD --
                then
-                       gpg_sign_opt_quoted=${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")}
-                       die "$(eval_gettext "\
+                       # Nothing to commit -- skip this commit
+
+                       test ! -f "$GIT_DIR"/CHERRY_PICK_HEAD ||
+                       rm "$GIT_DIR"/CHERRY_PICK_HEAD ||
+                       die "$(gettext "Could not remove CHERRY_PICK_HEAD")"
+               else
+                       if ! test -f "$author_script"
+                       then
+                               gpg_sign_opt_quoted=${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")}
+                               die "$(eval_gettext "\
 You have staged changes in your working tree.
 If these changes are meant to be
 squashed into the previous commit, run:
@@ -788,88 +789,199 @@ In both cases, once you're done, continue with:
 
   git rebase --continue
 ")"
-               fi
-               . "$author_script" ||
-                       die "$(gettext "Error trying to find the author identity to amend commit")"
-               if test -f "$amend"
-               then
-                       current_head=$(git rev-parse --verify HEAD)
-                       test "$current_head" = $(cat "$amend") ||
-                       die "$(gettext "\
+                       fi
+                       . "$author_script" ||
+                               die "$(gettext "Error trying to find the author identity to amend commit")"
+                       if test -f "$amend"
+                       then
+                               current_head=$(git rev-parse --verify HEAD)
+                               test "$current_head" = $(cat "$amend") ||
+                               die "$(gettext "\
 You have uncommitted changes in your working tree. Please commit them
 first and then run 'git rebase --continue' again.")"
-                       do_with_author git commit --amend --no-verify -F "$msg" -e \
-                               ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
-                               die "$(gettext "Could not commit staged changes.")"
-               else
-                       do_with_author git commit --no-verify -F "$msg" -e \
-                               ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
-                               die "$(gettext "Could not commit staged changes.")"
+                               do_with_author git commit --amend --no-verify -F "$msg" -e \
+                                       ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
+                                       die "$(gettext "Could not commit staged changes.")"
+                       else
+                               do_with_author git commit --no-verify -F "$msg" -e \
+                                       ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
+                                       die "$(gettext "Could not commit staged changes.")"
+                       fi
                fi
-       fi
 
-       if test -r "$state_dir"/stopped-sha
+               if test -r "$state_dir"/stopped-sha
+               then
+                       record_in_rewritten "$(cat "$state_dir"/stopped-sha)"
+               fi
+
+               require_clean_work_tree "rebase"
+               do_rest
+               return 0
+               ;;
+       skip)
+               git rerere clear
+
+               if test ! -d "$rewritten"
+               then
+                       exec git rebase--helper ${force_rebase:+--no-ff} $allow_empty_message \
+                               --continue
+               fi
+               do_rest
+               return 0
+               ;;
+       edit-todo)
+               git stripspace --strip-comments <"$todo" >"$todo".new
+               mv -f "$todo".new "$todo"
+               collapse_todo_ids
+               append_todo_help
+               gettext "
+You are editing the todo file of an ongoing interactive rebase.
+To continue rebase after editing, run:
+    git rebase --continue
+
+" | git stripspace --comment-lines >>"$todo"
+
+               git_sequence_editor "$todo" ||
+                       die "$(gettext "Could not execute editor")"
+               expand_todo_ids
+
+               exit
+               ;;
+       show-current-patch)
+               exec git show REBASE_HEAD --
+               ;;
+       *)
+               return 1 # continue
+               ;;
+       esac
+}
+
+setup_reflog_action () {
+       comment_for_reflog start
+
+       if test ! -z "$switch_to"
        then
-               record_in_rewritten "$(cat "$state_dir"/stopped-sha)"
+               GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to"
+               output git checkout "$switch_to" -- ||
+                       die "$(eval_gettext "Could not checkout \$switch_to")"
+
+               comment_for_reflog start
        fi
+}
 
-       require_clean_work_tree "rebase"
-       do_rest
-       return 0
-       ;;
-skip)
-       git rerere clear
+init_basic_state () {
+       orig_head=$(git rev-parse --verify HEAD) || die "$(gettext "No HEAD?")"
+       mkdir -p "$state_dir" || die "$(eval_gettext "Could not create temporary \$state_dir")"
+       rm -f "$(git rev-parse --git-path REBASE_HEAD)"
+
+       : > "$state_dir"/interactive || die "$(gettext "Could not mark as interactive")"
+       write_basic_state
+}
 
-       if test ! -d "$rewritten"
+init_revisions_and_shortrevisions () {
+       shorthead=$(git rev-parse --short $orig_head)
+       shortonto=$(git rev-parse --short $onto)
+       if test -z "$rebase_root"
+               # this is now equivalent to ! -z "$upstream"
        then
-               exec git rebase--helper ${force_rebase:+--no-ff} $allow_empty_message \
-                       --continue
+               shortupstream=$(git rev-parse --short $upstream)
+               revisions=$upstream...$orig_head
+               shortrevisions=$shortupstream..$shorthead
+       else
+               revisions=$onto...$orig_head
+               shortrevisions=$shorthead
        fi
-       do_rest
-       return 0
-       ;;
-edit-todo)
-       git stripspace --strip-comments <"$todo" >"$todo".new
-       mv -f "$todo".new "$todo"
-       collapse_todo_ids
+}
+
+complete_action() {
+       test -s "$todo" || echo noop >> "$todo"
+       test -z "$autosquash" || git rebase--helper --rearrange-squash || exit
+       test -n "$cmd" && git rebase--helper --add-exec-commands "$cmd"
+
+       todocount=$(git stripspace --strip-comments <"$todo" | wc -l)
+       todocount=${todocount##* }
+
+cat >>"$todo" <<EOF
+
+$comment_char $(eval_ngettext \
+       "Rebase \$shortrevisions onto \$shortonto (\$todocount command)" \
+       "Rebase \$shortrevisions onto \$shortonto (\$todocount commands)" \
+       "$todocount")
+EOF
        append_todo_help
        gettext "
-You are editing the todo file of an ongoing interactive rebase.
-To continue rebase after editing, run:
-    git rebase --continue
+       However, if you remove everything, the rebase will be aborted.
 
-" | git stripspace --comment-lines >>"$todo"
+       " | git stripspace --comment-lines >>"$todo"
+
+       if test -z "$keep_empty"
+       then
+               printf '%s\n' "$comment_char $(gettext "Note that empty commits are commented out")" >>"$todo"
+       fi
 
+
+       has_action "$todo" ||
+               return 2
+
+       cp "$todo" "$todo".backup
+       collapse_todo_ids
        git_sequence_editor "$todo" ||
-               die "$(gettext "Could not execute editor")"
+               die_abort "$(gettext "Could not execute editor")"
+
+       has_action "$todo" ||
+               return 2
+
+       git rebase--helper --check-todo-list || {
+               ret=$?
+               checkout_onto
+               exit $ret
+       }
+
        expand_todo_ids
 
-       exit
-       ;;
-show-current-patch)
-       exec git show REBASE_HEAD --
-       ;;
-esac
+       test -d "$rewritten" || test -n "$force_rebase" ||
+       onto="$(git rebase--helper --skip-unnecessary-picks)" ||
+       die "Could not skip unnecessary pick commands"
 
-comment_for_reflog start
+       checkout_onto
+       if test -z "$rebase_root" && test ! -d "$rewritten"
+       then
+               require_clean_work_tree "rebase"
+               exec git rebase--helper ${force_rebase:+--no-ff} $allow_empty_message \
+                       --continue
+       fi
+       do_rest
+}
 
-if test ! -z "$switch_to"
-then
-       GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to"
-       output git checkout "$switch_to" -- ||
-               die "$(eval_gettext "Could not checkout \$switch_to")"
+git_rebase__interactive () {
+       initiate_action "$action"
+       ret=$?
+       if test $ret = 0; then
+               return 0
+       fi
 
-       comment_for_reflog start
-fi
+       setup_reflog_action
+       init_basic_state
+
+       init_revisions_and_shortrevisions
+
+       git rebase--helper --make-script ${keep_empty:+--keep-empty} \
+               $revisions ${restrict_revision+^$restrict_revision} >"$todo" ||
+       die "$(gettext "Could not generate todo list")"
+
+       complete_action
+}
 
-orig_head=$(git rev-parse --verify HEAD) || die "$(gettext "No HEAD?")"
-mkdir -p "$state_dir" || die "$(eval_gettext "Could not create temporary \$state_dir")"
-rm -f "$(git rev-parse --git-path REBASE_HEAD)"
+git_rebase__interactive__preserve_merges () {
+       initiate_action "$action"
+       ret=$?
+       if test $ret = 0; then
+               return 0
+       fi
+
+       setup_reflog_action
+       init_basic_state
 
-: > "$state_dir"/interactive || die "$(gettext "Could not mark as interactive")"
-write_basic_state
-if test t = "$preserve_merges"
-then
        if test -z "$rebase_root"
        then
                mkdir "$rewritten" &&
@@ -883,41 +995,17 @@ then
                echo $onto > "$rewritten"/root ||
                        die "$(gettext "Could not init rewritten commits")"
        fi
-       # No cherry-pick because our first pass is to determine
-       # parents to rewrite and skipping dropped commits would
-       # prematurely end our probe
-       merges_option=
-else
-       merges_option="--no-merges --cherry-pick"
-fi
-
-shorthead=$(git rev-parse --short $orig_head)
-shortonto=$(git rev-parse --short $onto)
-if test -z "$rebase_root"
-       # this is now equivalent to ! -z "$upstream"
-then
-       shortupstream=$(git rev-parse --short $upstream)
-       revisions=$upstream...$orig_head
-       shortrevisions=$shortupstream..$shorthead
-else
-       revisions=$onto...$orig_head
-       shortrevisions=$shorthead
-fi
-if test t != "$preserve_merges"
-then
-       git rebase--helper --make-script ${keep_empty:+--keep-empty} \
-               $revisions ${restrict_revision+^$restrict_revision} >"$todo" ||
-       die "$(gettext "Could not generate todo list")"
-else
+
+       init_revisions_and_shortrevisions
+
        format=$(git config --get rebase.instructionFormat)
        # the 'rev-list .. | sed' requires %m to parse; the instruction requires %H to parse
-       git rev-list $merges_option --format="%m%H ${format:-%s}" \
+       git rev-list --format="%m%H ${format:-%s}" \
                --reverse --left-right --topo-order \
                $revisions ${restrict_revision+^$restrict_revision} | \
                sed -n "s/^>//p" |
        while read -r sha1 rest
        do
-
                if test -z "$keep_empty" && is_empty_commit $sha1 && ! is_merge_commit $sha1
                then
                        comment_out="$comment_char "
@@ -944,11 +1032,8 @@ else
                        printf '%s\n' "${comment_out}pick $sha1 $rest" >>"$todo"
                fi
        done
-fi
 
-# Watch for commits that been dropped by --cherry-pick
-if test t = "$preserve_merges"
-then
+       # Watch for commits that been dropped by --cherry-pick
        mkdir "$dropped"
        # Save all non-cherry-picked changes
        git rev-list $revisions --left-right --cherry-pick | \
@@ -971,66 +1056,6 @@ then
                        rm "$rewritten"/$rev
                fi
        done
-fi
-
-test -s "$todo" || echo noop >> "$todo"
-test -z "$autosquash" || git rebase--helper --rearrange-squash || exit
-test -n "$cmd" && git rebase--helper --add-exec-commands "$cmd"
-
-todocount=$(git stripspace --strip-comments <"$todo" | wc -l)
-todocount=${todocount##* }
-
-cat >>"$todo" <<EOF
-
-$comment_char $(eval_ngettext \
-       "Rebase \$shortrevisions onto \$shortonto (\$todocount command)" \
-       "Rebase \$shortrevisions onto \$shortonto (\$todocount commands)" \
-       "$todocount")
-EOF
-append_todo_help
-gettext "
-However, if you remove everything, the rebase will be aborted.
-
-" | git stripspace --comment-lines >>"$todo"
-
-if test -z "$keep_empty"
-then
-       printf '%s\n' "$comment_char $(gettext "Note that empty commits are commented out")" >>"$todo"
-fi
-
-
-has_action "$todo" ||
-       return 2
-
-cp "$todo" "$todo".backup
-collapse_todo_ids
-git_sequence_editor "$todo" ||
-       die_abort "$(gettext "Could not execute editor")"
-
-has_action "$todo" ||
-       return 2
-
-git rebase--helper --check-todo-list || {
-       ret=$?
-       checkout_onto
-       exit $ret
-}
-
-expand_todo_ids
-
-test -d "$rewritten" || test -n "$force_rebase" ||
-onto="$(git rebase--helper --skip-unnecessary-picks)" ||
-die "Could not skip unnecessary pick commands"
-
-checkout_onto
-if test -z "$rebase_root" && test ! -d "$rewritten"
-then
-       require_clean_work_tree "rebase"
-       exec git rebase--helper ${force_rebase:+--no-ff} $allow_empty_message \
-               --continue
-fi
-do_rest
 
+       complete_action
 }
-# ... and then we call the whole thing.
-git_rebase__interactive