1 files changed, 181 insertions, 0 deletions

diff --git a/submodules.sh b/submodules.sh
new file mode 100755
index 0000000..1d7b13f
--- /dev/null
+++ b/submodules.sh
@@ -0,0 +1,181 @@
+#!/bin/sh
+#
+# submodules.sh: init, update or list git submodules
+#
+# Copyright (C) 2006 Lars Hjemli
+#
+# Licensed under GNU General Public License v2
+#   (see COPYING for full license text)
+#
+
+
+usage="submodules.sh [-i | -u] [-q] [--cached] [path...]"
+init=
+update=
+quiet=
+cached=
+
+
+say()
+{
+        if test -z "$quiet"
+        then
+                echo -e "$@"
+        fi
+}
+
+
+die()
+{
+        echo >&2 -e "$@"
+        exit 1
+}
+
+
+
+#
+# Silently checkout specified submodule revision, return exit status of git-checkout
+#
+# $1 = local path
+# $2 = requested sha1
+#
+module_checkout()
+{
+        $(cd "$1" && git checkout "$2" 1>/dev/null 2>/dev/null)
+}
+
+
+#
+# Find all (requested) submodules, run clone + checkout on missing paths
+#
+# $@ = requested paths (default to all)
+#
+modules_init()
+{
+        git ls-files --stage -- $@ | grep -e '^160000 ' |
+        while read mode sha1 stage path
+        do
+                test -d "$path/.git" && continue
+
+                if test -d "$path"
+                then
+                        rmdir "$path" 2>/dev/null ||
+                        die "Directory '$path' exist, but not as a submodule"
+                fi
+
+                test -e "$path" && die "A file already exist at path '$path'"
+
+                url=$(sed -nre "s/^$path[ \t]+//p" .gitmodules)
+                test -z "$url" && die "No url found for $path in .gitmodules"
+
+                git clone "$url" "$path" || die "Clone of submodule '$path' failed"
+                module_checkout "$path" "$sha1" || die "Checkout of submodule '$path' failed"
+                say "Submodule '$path' initialized"
+        done
+}
+
+#
+# Checkout correct revision of each initialized submodule
+#
+# $@ = requested paths (default to all)
+#
+modules_update()
+{
+        git ls-files --stage -- $@ | grep -e '^160000 ' |
+        while read mode sha1 stage path
+        do
+                if ! test -d "$path/.git"
+                then
+                        say "Submodule '$path' not initialized"
+                        continue;
+                fi
+                subsha1=$(cd "$path" && git rev-parse --verify HEAD) ||
+                die "Unable to find current revision of submodule '$path'"
+                if test "$subsha1" != "$sha1"
+                then
+                        module_checkout "$path" "$sha1" ||
+                        die "Unable to checkout revision $sha1 of submodule '$path'"
+                        say "Submodule '$path' reset to revision $sha1"
+                fi
+        done
+}
+
+#
+# List all registered submodules, prefixed with:
+#  - submodule not initialized
+#  + different version checked out
+#
+# If --cached was specified the revision in the index will be printed
+# instead of the currently checked out revision.
+#
+# $@ = requested paths (default to all)
+#
+modules_list()
+{
+        git ls-files --stage -- $@ | grep -e '^160000 ' |
+        while read mode sha1 stage path
+        do
+                if ! test -d "$path/.git"
+                then
+                        say "-$sha1 $path"
+                        continue;
+                fi
+                revname=$(cd "$path" && git describe $sha1)
+                if git diff-files --quiet -- "$path"
+                then
+                        say " $sha1 $path\t($revname)"
+                else
+                        if test -z "$cached"
+                        then
+                                sha1=$(cd "$path" && git rev-parse HEAD)
+                                revname=$(cd "$path" && git describe HEAD)
+                        fi
+                        say "+$sha1 $path\t($revname)"
+                fi
+        done
+}
+
+
+while case "$#" in 0) break ;; esac
+do
+        case "$1" in
+        -i)
+                init=1
+                ;;
+        -u)
+                update=1
+                ;;
+        -q)
+                quiet=1
+                ;;
+        --cached)
+                cached=1
+                ;;
+        --)
+                break
+                ;;
+        -*)
+                echo "Usage: $usage"
+                exit 1
+                ;;
+        --*)
+                echo "Usage: $usage"
+                exit 1
+                ;;
+        *)
+                break
+                ;;
+        esac
+        shift
+done
+
+
+if test "$init" = "1"
+then
+        modules_init $@
+elif test "$update" = "1"
+then
+        modules_update $@
+else
+        modules_list $@
+fi