Imported Upstream version 2.0.1

[platform/upstream/git.git] / git-sh-setup.sh

diff --git a/git-sh-setup.sh b/git-sh-setup.sh
index 795edd2..5f28b32 100644 (file)
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -1,9 +1,6 @@
-#!/bin/sh
-#
-# This is included in commands that either have to be run from the toplevel
-# of the repository, or with GIT_DIR environment variable properly.
-# If the GIT_DIR does not look like the right correct git-repository,
-# it dies.
+# This shell scriplet is meant to be included by other shell scripts
+# to set up some variables pointing at the normal git directories and
+# a few helper shell functions.
 
 # Having this variable in your environment would break scripts because
 # you would cause "cd" to be taken to unexpected places.  If you
@@ -53,7 +50,7 @@ die () {
 die_with_status () {
        status=$1
        shift
-       echo >&2 "$*"
+       printf >&2 '%s\n' "$*"
        exit "$status"
 }
 
@@ -75,6 +72,8 @@ if test -n "$OPTIONS_SPEC"; then
        parseopt_extra=
        [ -n "$OPTIONS_KEEPDASHDASH" ] &&
                parseopt_extra="--keep-dashdash"
+       [ -n "$OPTIONS_STUCKLONG" ] &&
+               parseopt_extra="$parseopt_extra --stuck-long"
 
        eval "$(
                echo "$OPTIONS_SPEC" |
@@ -84,14 +83,14 @@ 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
@@ -103,6 +102,40 @@ $LONG_USAGE"
        esac
 fi
 
+# Set the name of the end-user facing command in the reflog when the
+# script may update refs.  When GIT_REFLOG_ACTION is already set, this
+# will not overwrite it, so that a scripted Porcelain (e.g. "git
+# rebase") can set it to its own name (e.g. "rebase") and then call
+# another scripted Porcelain (e.g. "git am") and a call to this
+# function in the latter will keep the name of the end-user facing
+# program (e.g. "rebase") in GIT_REFLOG_ACTION, ensuring whatever it
+# does will be record as actions done as part of the end-user facing
+# operation (e.g. "rebase").
+#
+# NOTE NOTE NOTE: consequently, after assigning a specific message to
+# GIT_REFLOG_ACTION when calling a "git" command to record a custom
+# reflog message, do not leave that custom value in GIT_REFLOG_ACTION,
+# after you are done.  Other callers of "git" commands that rely on
+# writing the default "program name" in reflog expect the variable to
+# contain the value set by this function.
+#
+# To use a custom reflog message, do either one of these three:
+#
+# (a) use a single-shot export form:
+#     GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz" \
+#         git command-that-updates-a-ref
+#
+# (b) save the original away and restore:
+#     SAVED_ACTION=$GIT_REFLOG_ACTION
+#     GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz"
+#     git command-that-updates-a-ref
+#     GIT_REFLOG_ACITON=$SAVED_ACTION
+#
+# (c) assign the variable in a subshell:
+#     (
+#         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: preparing frotz"
+#         git command-that-updates-a-ref
+#     )
 set_reflog_action() {
        if [ -z "${GIT_REFLOG_ACTION:+set}" ]
        then
@@ -128,7 +161,8 @@ git_pager() {
                GIT_PAGER=cat
        fi
        : ${LESS=-FRSX}
-       export LESS
+       : ${LV=-c}
+       export LESS LV
 
        eval "$GIT_PAGER" '"$@"'
 }
@@ -249,6 +283,18 @@ 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
@@ -301,3 +347,15 @@ then
        }
        : ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}
 fi
+
+peel_committish () {
+       case "$1" in
+       :/*)
+               peeltmp=$(git rev-parse --verify "$1") &&
+               git rev-parse --verify "${peeltmp}^0"
+               ;;
+       *)
+               git rev-parse --verify "${1}^0"
+               ;;
+       esac
+}