aboutsummaryrefslogtreecommitdiff
path: root/git-submodule.sh
blob: 2cfeaddbc27fd00e089bcf2ffd76e1271f1f3eb9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
#!/bin/sh
#
# git-submodules.sh: add, init, update or list git submodules
#
# Copyright (c) 2007 Lars Hjemli

USAGE='[--quiet] [--cached] [add <repo> [-b branch]|status|init|update] [--] [<path>...]'
. git-sh-setup
require_work_tree

add=
branch=
init=
update=
status=
quiet=
cached=

#
# print stuff on stdout unless -q was specified
#
say()
{
	if test -z "$quiet"
	then
		echo "$@"
	fi
}

# NEEDSWORK: identical function exists in get_repo_base in clone.sh
get_repo_base() {
	(
		cd "`/bin/pwd`" &&
		cd "$1" || cd "$1.git" &&
		{
			cd .git
			pwd
		}
	) 2>/dev/null
}

#
# Map submodule path to submodule name
#
# $1 = path
#
module_name()
{
	# Do we have "submodule.<something>.path = $1" defined in .gitmodules file?
	re=$(printf '%s' "$1" | sed -e 's/\([^a-zA-Z0-9_]\)/\\\1/g')
	name=$( GIT_CONFIG=.gitmodules \
		git config --get-regexp '^submodule\..*\.path$' |
		sed -n -e 's|^submodule\.\(.*\)\.path '"$re"'$|\1|p' )
       test -z "$name" &&
       die "No submodule mapping found in .gitmodules for path '$path'"
       echo "$name"
}

#
# Clone a submodule
#
# Prior to calling, modules_update checks that a possibly existing
# path is not a git repository.
# Likewise, module_add checks that path does not exist at all,
# since it is the location of a new submodule.
#
module_clone()
{
	path=$1
	url=$2

	# If there already is a directory at the submodule path,
	# expect it to be empty (since that is the default checkout
	# action) and try to remove it.
	# Note: if $path is a symlink to a directory the test will
	# succeed but the rmdir will fail. We might want to fix this.
	if test -d "$path"
	then
		rmdir "$path" 2>/dev/null ||
		die "Directory '$path' exist, but is neither empty nor a git repository"
	fi

	test -e "$path" &&
	die "A file already exist at path '$path'"

	git-clone -n "$url" "$path" ||
	die "Clone of '$url' into submodule path '$path' failed"
}

#
# Add a new submodule to the working tree, .gitmodules and the index
#
# $@ = repo [path]
#
# optional branch is stored in global branch variable
#
module_add()
{
	repo=$1
	path=$2

	if test -z "$repo"; then
		usage
	fi

	# Turn the source into an absolute path if
	# it is local
	if base=$(get_repo_base "$repo"); then
		repo="$base"
	fi

	# Guess path from repo if not specified or strip trailing slashes
	if test -z "$path"; then
		path=$(echo "$repo" | sed -e 's|/*$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
	else
		path=$(echo "$path" | sed -e 's|/*$||')
	fi

	test -e "$path" &&
	die "'$path' already exists"

	git ls-files --error-unmatch "$path" > /dev/null 2>&1 &&
	die "'$path' already exists in the index"

	module_clone "$path" "$repo" || exit
	(unset GIT_DIR && cd "$path" && git checkout -q ${branch:+-b "$branch" "origin/$branch"}) ||
	die "Unable to checkout submodule '$path'"
	git add "$path" ||
	die "Failed to add submodule '$path'"

	GIT_CONFIG=.gitmodules git config submodule."$path".path "$path" &&
	GIT_CONFIG=.gitmodules git config submodule."$path".url "$repo" &&
	git add .gitmodules ||
	die "Failed to register submodule '$path'"
}

#
# Register submodules in .git/config
#
# $@ = requested paths (default to all)
#
modules_init()
{
	git ls-files --stage -- "$@" | grep -e '^160000 ' |
	while read mode sha1 stage path
	do
		# Skip already registered paths
		name=$(module_name "$path") || exit
		url=$(git config submodule."$name".url)
		test -z "$url" || continue

		url=$(GIT_CONFIG=.gitmodules git config submodule."$name".url)
		test -z "$url" &&
		die "No url found for submodule path '$path' in .gitmodules"

		git config submodule."$name".url "$url" ||
		die "Failed to register url for submodule path '$path'"

		say "Submodule '$name' ($url) registered for path '$path'"
	done
}

#
# Update each submodule path to correct revision, using clone and checkout as needed
#
# $@ = requested paths (default to all)
#
modules_update()
{
	git ls-files --stage -- "$@" | grep -e '^160000 ' |
	while read mode sha1 stage path
	do
		name=$(module_name "$path") || exit
		url=$(git config submodule."$name".url)
		if test -z "$url"
		then
			# Only mention uninitialized submodules when its
			# path have been specified
			test "$#" != "0" &&
			say "Submodule path '$path' not initialized"
			continue
		fi

		if ! test -d "$path"/.git
		then
			module_clone "$path" "$url" || exit
			subsha1=
		else
			subsha1=$(unset GIT_DIR && cd "$path" &&
				git rev-parse --verify HEAD) ||
			die "Unable to find current revision in submodule path '$path'"
		fi

		if test "$subsha1" != "$sha1"
		then
			(unset GIT_DIR && cd "$path" && git-fetch &&
				git-checkout -q "$sha1") ||
			die "Unable to checkout '$sha1' in submodule path '$path'"

			say "Submodule path '$path': checked out '$sha1'"
		fi
	done
}

set_name_rev () {
	revname=$( (
		unset GIT_DIR &&
		cd "$1" && {
			git describe "$2" 2>/dev/null ||
			git describe --tags "$2" 2>/dev/null ||
			git describe --contains --tags "$2"
		}
	) )
	test -z "$revname" || revname=" ($revname)"
}

#
# List all submodules, prefixed with:
#  - submodule not initialized
#  + different revision 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
		name=$(module_name "$path") || exit
		url=$(git config submodule."$name".url)
		if test -z "url" || ! test -d "$path"/.git
		then
			say "-$sha1 $path"
			continue;
		fi
		set_name_rev "$path" "$sha1"
		if git diff-files --quiet -- "$path"
		then
			say " $sha1 $path$revname"
		else
			if test -z "$cached"
			then
				sha1=$(unset GIT_DIR && cd "$path" && git rev-parse --verify HEAD)
				set_name_rev "$path" "$sha1"
			fi
			say "+$sha1 $path$revname"
		fi
	done
}

while case "$#" in 0) break ;; esac
do
	case "$1" in
	add)
		add=1
		;;
	init)
		init=1
		;;
	update)
		update=1
		;;
	status)
		status=1
		;;
	-q|--quiet)
		quiet=1
		;;
	-b|--branch)
		case "$2" in
		'')
			usage
			;;
		esac
		branch="$2"; shift
		;;
	--cached)
		cached=1
		;;
	--)
		break
		;;
	-*)
		usage
		;;
	*)
		break
		;;
	esac
	shift
done

case "$add,$branch" in
1,*)
	;;
,)
	;;
,*)
	usage
	;;
esac

case "$add,$init,$update,$status,$cached" in
1,,,,)
	module_add "$@"
	;;
,1,,,)
	modules_init "$@"
	;;
,,1,,)
	modules_update "$@"
	;;
,,,1,*)
	modules_list "$@"
	;;
*)
	usage
	;;
esac