cgitsb/submodules.sh
Lars Hjemli cc1dbd1b5d Add submodules.sh and use it during builds
This adds a shell script which can be be used to initialize, list and
update submodules in a git repository. It reads the file .gitmodules
to find a mapping between submodule path and repository url for the
initial clone of all submodules.

The script is used during cgit builds to enable automatic download and
checkout of the git git repository.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
2007-05-11 11:03:52 +02:00

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#!/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