git-svn: handle our top-level path being deleted and later re-added

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index c9f515d0ee0f36fc44f667f17674462ced7c2c9e..29d35fd27c52abf208f57e2a99d3de6e6ff2f977 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -8,6 +8,9 @@
 # a new branch. You can specify a number of filters to modify the commits,
 # files and trees.
 
+# The following functions will also be available in the commit filter:
+
+functions=$(cat << \EOF
 warn () {
         echo "$*" >&2
 }
@@ -46,6 +49,10 @@ die()
        echo "$*" >&2
        exit 1
 }
+EOF
+)
+
+eval "$functions"
 
 # When piped a commit, output a script to set the ident of either
 # "author" or "committer
@@ -59,17 +66,17 @@ set_ident () {
                        h
                        s/^'$lid' \([^<]*\) <[^>]*> .*$/\1/
                        s/'\''/'\''\'\'\''/g
-                       s/.*/export GIT_'$uid'_NAME='\''&'\''/p
+                       s/.*/GIT_'$uid'_NAME='\''&'\''; export GIT_'$uid'_NAME/p
 
                        g
                        s/^'$lid' [^<]* <\([^>]*\)> .*$/\1/
                        s/'\''/'\''\'\'\''/g
-                       s/.*/export GIT_'$uid'_EMAIL='\''&'\''/p
+                       s/.*/GIT_'$uid'_EMAIL='\''&'\''; export GIT_'$uid'_EMAIL/p
 
                        g
                        s/^'$lid' [^<]* <[^>]*> \(.*\)$/\1/
                        s/'\''/'\''\'\'\''/g
-                       s/.*/export GIT_'$uid'_DATE='\''&'\''/p
+                       s/.*/GIT_'$uid'_DATE='\''&'\''; export GIT_'$uid'_DATE/p
 
                        q
                }
@@ -77,14 +84,9 @@ set_ident () {
 
        LANG=C LC_ALL=C sed -ne "$pick_id_script"
        # Ensure non-empty id name.
-       echo "[ -n \"\$GIT_${uid}_NAME\" ] || export GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\""
+       echo "case \"\$GIT_${uid}_NAME\" in \"\") GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\" && export GIT_${uid}_NAME;; esac"
 }
 
-# This script can be sourced by the commit filter to get the functions
-test "a$SOURCE_FUNCTIONS" = a1 && return
-this_script="$(cd "$(dirname "$0")"; pwd)"/$(basename "$0")
-export this_script
-
 USAGE="[--env-filter <command>] [--tree-filter <command>] \
 [--index-filter <command>] [--parent-filter <command>] \
 [--msg-filter <command>] [--commit-filter <command>] \
@@ -96,7 +98,7 @@ OPTIONS_SPEC=
 . git-sh-setup
 
 git diff-files --quiet &&
-       git diff-index --cached --quiet HEAD ||
+       git diff-index --cached --quiet HEAD -- ||
        die "Cannot rewrite branch(es) with a dirty working directory."
 
 tempdir=.git-rewrite
@@ -156,7 +158,7 @@ do
                filter_msg="$OPTARG"
                ;;
        --commit-filter)
-               filter_commit='SOURCE_FUNCTIONS=1 . "$this_script";'" $OPTARG"
+               filter_commit="$functions; $OPTARG"
                ;;
        --tag-name-filter)
                filter_tag_name="$OPTARG"
@@ -204,7 +206,8 @@ done < "$tempdir"/backup-refs
 ORIG_GIT_DIR="$GIT_DIR"
 ORIG_GIT_WORK_TREE="$GIT_WORK_TREE"
 ORIG_GIT_INDEX_FILE="$GIT_INDEX_FILE"
-export GIT_DIR GIT_WORK_TREE=.
+GIT_WORK_TREE=.
+export GIT_DIR GIT_WORK_TREE
 
 # These refs should be updated if their heads were rewritten
 
@@ -229,7 +232,8 @@ done > "$tempdir"/heads
 test -s "$tempdir"/heads ||
        die "Which ref do you want to rewrite?"
 
-export GIT_INDEX_FILE="$(pwd)/../index"
+GIT_INDEX_FILE="$(pwd)/../index"
+export GIT_INDEX_FILE
 git read-tree || die "Could not seed the index"
 
 ret=0
@@ -265,7 +269,8 @@ while read commit parents; do
                git read-tree -i -m $commit:"$filter_subdir"
        esac || die "Could not initialize the index"
 
-       export GIT_COMMIT=$commit
+       GIT_COMMIT=$commit
+       export GIT_COMMIT
        git cat-file commit "$commit" >../commit ||
                die "Cannot read commit $commit"
 
@@ -399,7 +404,8 @@ if [ "$filter_tag_name" ]; then
 
                [ -f "../map/$sha1" ] || continue
                new_sha1="$(cat "../map/$sha1")"
-               export GIT_COMMIT="$sha1"
+               GIT_COMMIT="$sha1"
+               export GIT_COMMIT
                new_ref="$(echo "$ref" | eval "$filter_tag_name")" ||
                        die "tag name filter failed: $filter_tag_name"