3 files changed, 222 insertions, 13 deletions

diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..51dd1ef
--- a/dev/null
+++ b/.gitmodules
@@ -0,0 +1,5 @@
+# This file maps a submodule path to an url from where the submodule
+# can be obtained. The script "submodules.sh" finds the url in this file
+# when invoked with -i to clone the submodules.
+
+        git     git://git.kernel.org/pub/scm/git/git.git
diff --git a/Makefile b/Makefile
index 644914c..138f261 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,11 @@
 CGIT_VERSION = 0.2
 
 prefix = /var/www/htdocs/cgit
-gitsrc = git
 
 SHA1_HEADER = <openssl/sha.h>
 
 CACHE_ROOT = /var/cache/cgit
-EXTLIBS = $(gitsrc)/libgit.a $(gitsrc)/xdiff/lib.a -lz -lcrypto
+EXTLIBS = git/libgit.a git/xdiff/lib.a -lz -lcrypto
 OBJECTS = shared.o cache.o parsing.o html.o ui-shared.o ui-repolist.o \
         ui-summary.o ui-log.o ui-view.o ui-tree.o ui-commit.o ui-diff.o \
         ui-snapshot.o ui-blob.o
@@ -17,28 +16,52 @@ ifdef DEBUG
         CFLAGS += -g
 endif
 
-CFLAGS += -I$(gitsrc) -DSHA1_HEADER='$(SHA1_HEADER)'
+CFLAGS += -Igit -DSHA1_HEADER='$(SHA1_HEADER)'
 
+
+
+
+#
+# basic build rules
+#
 all: cgit
 
+cgit: cgit.c cgit.h $(OBJECTS)
+        $(CC) $(CFLAGS) -DCGIT_VERSION='"$(CGIT_VERSION)"' cgit.c -o cgit \
+                $(OBJECTS) $(EXTLIBS)
+
+$(OBJECTS): cgit.h git/libgit.a
+
+git/libgit.a:
+        ./submodules.sh -i
+        $(MAKE) -C git
+
+#
+# phony targets
+#
 install: all clean-cache
         mkdir -p $(prefix)
         install cgit $(prefix)/cgit.cgi
         install cgit.css $(prefix)/cgit.css
 
-cgit: cgit.c cgit.h $(OBJECTS) $(gitsrc)/libgit.a
-        $(CC) $(CFLAGS) -DCGIT_VERSION='"$(CGIT_VERSION)"' cgit.c -o cgit \
-                $(OBJECTS) $(EXTLIBS)
-
-$(OBJECTS): cgit.h
+clean-cgit:
+        rm -f cgit *.o
 
-$(gitsrc)/libgit.a:
-        $(MAKE) -C $(gitsrc)
+distclean-cgit: clean-cgit
+        git clean -d -x
 
+clean-sub:
+        $(MAKE) -C git clean
 
-.PHONY: clean
-clean:
-        rm -f cgit *.o
+distclean-sub: clean-sub
+        $(shell cd git && git clean -d -x)
 
 clean-cache:
         rm -rf $(CACHE_ROOT)/*
+
+clean: clean-cgit clean-sub
+
+distclean: distclean-cgit distclean-sub
+
+.PHONY: all install clean clean-cgit clean-sub clean-cache \
+        distclean distclean-cgit distclean-sub
diff --git a/submodules.sh b/submodules.sh
new file mode 100755
index 0000000..1d7b13f
--- a/dev/null
+++ b/submodules.sh
@@ -0,0 +1,181 @@
+#!/bin/sh
+#
+# submodules.sh: init, update or list git submodules
+#
+# Copyright (C) 2006 Lars Hjemli
+#
+# Licensed under GNU General Public License v2
+#   (see COPYING for full license text)
+#
+
+
+usage="submodules.sh [-i | -u] [-q] [--cached] [path...]"
+init=
+update=
+quiet=
+cached=
+
+
+say()
+{
+        if test -z "$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