upload-pack: send keepalive packets during pack computation

diff --git a/git-sh-setup.sh b/git-sh-setup.sh
index 770a86e2b7a5e517e51d9897b274b876a6b9e0e1..2f7835941ecaa48be17b6dd64e64fb0df3db37e2 100644 (file)
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -9,8 +9,15 @@
 # you would cause "cd" to be taken to unexpected places.  If you
 # like CDPATH, define it for your interactive shell sessions without
 # exporting it.
+# But we protect ourselves from such a user mistake nevertheless.
 unset CDPATH
 
+# Similarly for IFS, but some shells (e.g. FreeBSD 7.2) are buggy and
+# do not equate an unset IFS with IFS with the default, so here is
+# an explicit SP HT LF.
+IFS='  
+'
+
 git_broken_path_fix () {
        case ":$PATH:" in
        *:$1:*) : ok ;;
@@ -77,14 +84,14 @@ if test -n "$OPTIONS_SPEC"; then
 else
        dashless=$(basename "$0" | sed -e 's/-/ /')
        usage() {
-               die "Usage: $dashless $USAGE"
+               die "usage: $dashless $USAGE"
        }
 
        if [ -z "$LONG_USAGE" ]
        then
-               LONG_USAGE="Usage: $dashless $USAGE"
+               LONG_USAGE="usage: $dashless $USAGE"
        else
-               LONG_USAGE="Usage: $dashless $USAGE
+               LONG_USAGE="usage: $dashless $USAGE
 
 $LONG_USAGE"
        fi
@@ -187,28 +194,52 @@ require_clean_work_tree () {
        fi
 }
 
+# Generate a sed script to parse identities from a commit.
+#
+# Reads the commit from stdin, which should be in raw format (e.g., from
+# cat-file or "--pretty=raw").
+#
+# The first argument specifies the ident line to parse (e.g., "author"), and
+# the second specifies the environment variable to put it in (e.g., "AUTHOR"
+# for "GIT_AUTHOR_*"). Multiple pairs can be given to parse author and
+# committer.
+pick_ident_script () {
+       while test $# -gt 0
+       do
+               lid=$1; shift
+               uid=$1; shift
+               printf '%s' "
+               /^$lid /{
+                       s/'/'\\\\''/g
+                       h
+                       s/^$lid "'\([^<]*\) <[^>]*> .*$/\1/'"
+                       s/.*/GIT_${uid}_NAME='&'/p
+
+                       g
+                       s/^$lid "'[^<]* <\([^>]*\)> .*$/\1/'"
+                       s/.*/GIT_${uid}_EMAIL='&'/p
+
+                       g
+                       s/^$lid "'[^<]* <[^>]*> \(.*\)$/@\1/'"
+                       s/.*/GIT_${uid}_DATE='&'/p
+               }
+               "
+       done
+       echo '/^$/q'
+}
+
+# Create a pick-script as above and feed it to sed. Stdout is suitable for
+# feeding to eval.
+parse_ident_from_commit () {
+       LANG=C LC_ALL=C sed -ne "$(pick_ident_script "$@")"
+}
+
+# Parse the author from a commit given as an argument. Stdout is suitable for
+# feeding to eval to set the usual GIT_* ident variables.
 get_author_ident_from_commit () {
-       pick_author_script='
-       /^author /{
-               s/'\''/'\''\\'\'\''/g
-               h
-               s/^author \([^<]*\) <[^>]*> .*$/\1/
-               s/.*/GIT_AUTHOR_NAME='\''&'\''/p
-
-               g
-               s/^author [^<]* <\([^>]*\)> .*$/\1/
-               s/.*/GIT_AUTHOR_EMAIL='\''&'\''/p
-
-               g
-               s/^author [^<]* <[^>]*> \(.*\)$/@\1/
-               s/.*/GIT_AUTHOR_DATE='\''&'\''/p
-
-               q
-       }
-       '
        encoding=$(git config i18n.commitencoding || echo UTF-8)
        git show -s --pretty=raw --encoding="$encoding" "$1" -- |
-       LANG=C LC_ALL=C sed -ne "$pick_author_script"
+       parse_ident_from_commit author AUTHOR
 }
 
 # Clear repo-local GIT_* environment variables. Useful when switching to
@@ -218,6 +249,18 @@ clear_local_git_env() {
        unset $(git rev-parse --local-env-vars)
 }
 
+# Generate a virtual base file for a two-file merge. Uses git apply to
+# remove lines from $1 that are not in $2, leaving only common lines.
+create_virtual_base() {
+       sz0=$(wc -c <"$1")
+       @@DIFF@@ -u -La/"$1" -Lb/"$1" "$1" "$2" | git apply --no-add
+       sz1=$(wc -c <"$1")
+
+       # If we do not have enough common material, it is not
+       # worth trying two-file merge using common subsections.
+       expr $sz0 \< $sz1 \* 2 >/dev/null || : >"$1"
+}
+
 
 # Platform specific tweaks to work around some commands
 case $(uname -s) in