1#!/bin/sh
2#
3# git-submodules.sh: add, init, update or list git submodules
4#
5# Copyright (c) 2007 Lars Hjemli
6USAGE='[--quiet] [--cached] [add <repo> [-b branch]|status|init|update] [--] [<path>...]'
8OPTIONS_SPEC=
9. git-sh-setup
10require_work_tree
11command=
13branch=
14quiet=
15cached=
16#
18# print stuff on stdout unless -q was specified
19#
20say()
21{
22 if test -z "$quiet"
23 then
24 echo "$@"
25 fi
26}
27# NEEDSWORK: identical function exists in get_repo_base in clone.sh
29get_repo_base() {
30 (
31 cd "`/bin/pwd`" &&
32 cd "$1" || cd "$1.git" &&
33 {
34 cd .git
35 pwd
36 }
37 ) 2>/dev/null
38}
39# Resolve relative url by appending to parent's url
41resolve_relative_url ()
42{
43 branch="$(git symbolic-ref HEAD 2>/dev/null)"
44 remote="$(git config branch.${branch#refs/heads/}.remote)"
45 remote="${remote:-origin}"
46 remoteurl="$(git config remote.$remote.url)" ||
47 die "remote ($remote) does not have a url in .git/config"
48 url="$1"
49 while test -n "$url"
50 do
51 case "$url" in
52 ../*)
53 url="${url#../}"
54 remoteurl="${remoteurl%/*}"
55 ;;
56 ./*)
57 url="${url#./}"
58 ;;
59 *)
60 break;;
61 esac
62 done
63 echo "$remoteurl/$url"
64}
65#
67# Map submodule path to submodule name
68#
69# $1 = path
70#
71module_name()
72{
73 # Do we have "submodule.<something>.path = $1" defined in .gitmodules file?
74 re=$(printf '%s' "$1" | sed -e 's/[].[^$\\*]/\\&/g')
75 name=$( GIT_CONFIG=.gitmodules \
76 git config --get-regexp '^submodule\..*\.path$' |
77 sed -n -e 's|^submodule\.\(.*\)\.path '"$re"'$|\1|p' )
78 test -z "$name" &&
79 die "No submodule mapping found in .gitmodules for path '$path'"
80 echo "$name"
81}
82#
84# Clone a submodule
85#
86# Prior to calling, cmd_update checks that a possibly existing
87# path is not a git repository.
88# Likewise, cmd_add checks that path does not exist at all,
89# since it is the location of a new submodule.
90#
91module_clone()
92{
93 path=$1
94 url=$2
95 # If there already is a directory at the submodule path,
97 # expect it to be empty (since that is the default checkout
98 # action) and try to remove it.
99 # Note: if $path is a symlink to a directory the test will
100 # succeed but the rmdir will fail. We might want to fix this.
101 if test -d "$path"
102 then
103 rmdir "$path" 2>/dev/null ||
104 die "Directory '$path' exist, but is neither empty nor a git repository"
105 fi
106 test -e "$path" &&
108 die "A file already exist at path '$path'"
109 git-clone -n "$url" "$path" ||
111 die "Clone of '$url' into submodule path '$path' failed"
112}
113#
115# Add a new submodule to the working tree, .gitmodules and the index
116#
117# $@ = repo [path]
118#
119# optional branch is stored in global branch variable
120#
121cmd_add()
122{
123 # parse $args after "submodule ... add".
124 while test $# -ne 0
125 do
126 case "$1" in
127 -b | --branch)
128 case "$2" in '') usage ;; esac
129 branch=$2
130 shift
131 ;;
132 -q|--quiet)
133 quiet=1
134 ;;
135 --)
136 shift
137 break
138 ;;
139 -*)
140 usage
141 ;;
142 *)
143 break
144 ;;
145 esac
146 shift
147 done
148 repo=$1
150 path=$2
151 if test -z "$repo"; then
153 usage
154 fi
155 case "$repo" in
157 ./*|../*)
158 # dereference source url relative to parent's url
159 realrepo="$(resolve_relative_url $repo)" ;;
160 *)
161 # Turn the source into an absolute path if
162 # it is local
163 if base=$(get_repo_base "$repo"); then
164 repo="$base"
165 fi
166 realrepo=$repo
167 ;;
168 esac
169 # Guess path from repo if not specified or strip trailing slashes
171 if test -z "$path"; then
172 path=$(echo "$repo" | sed -e 's|/*$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
173 else
174 path=$(echo "$path" | sed -e 's|/*$||')
175 fi
176 test -e "$path" &&
178 die "'$path' already exists"
179 git ls-files --error-unmatch "$path" > /dev/null 2>&1 &&
181 die "'$path' already exists in the index"
182 module_clone "$path" "$realrepo" || exit
184 (unset GIT_DIR; cd "$path" && git checkout -q ${branch:+-b "$branch" "origin/$branch"}) ||
185 die "Unable to checkout submodule '$path'"
186 git add "$path" ||
187 die "Failed to add submodule '$path'"
188 GIT_CONFIG=.gitmodules git config submodule."$path".path "$path" &&
190 GIT_CONFIG=.gitmodules git config submodule."$path".url "$repo" &&
191 git add .gitmodules ||
192 die "Failed to register submodule '$path'"
193}
194#
196# Register submodules in .git/config
197#
198# $@ = requested paths (default to all)
199#
200cmd_init()
201{
202 # parse $args after "submodule ... init".
203 while test $# -ne 0
204 do
205 case "$1" in
206 -q|--quiet)
207 quiet=1
208 ;;
209 --)
210 shift
211 break
212 ;;
213 -*)
214 usage
215 ;;
216 *)
217 break
218 ;;
219 esac
220 shift
221 done
222 git ls-files --stage -- "$@" | grep -e '^160000 ' |
224 while read mode sha1 stage path
225 do
226 # Skip already registered paths
227 name=$(module_name "$path") || exit
228 url=$(git config submodule."$name".url)
229 test -z "$url" || continue
230 url=$(GIT_CONFIG=.gitmodules git config submodule."$name".url)
232 test -z "$url" &&
233 die "No url found for submodule path '$path' in .gitmodules"
234 # Possibly a url relative to parent
236 case "$url" in
237 ./*|../*)
238 url="$(resolve_relative_url "$url")"
239 ;;
240 esac
241 git config submodule."$name".url "$url" ||
243 die "Failed to register url for submodule path '$path'"
244 say "Submodule '$name' ($url) registered for path '$path'"
246 done
247}
248#
250# Update each submodule path to correct revision, using clone and checkout as needed
251#
252# $@ = requested paths (default to all)
253#
254cmd_update()
255{
256 # parse $args after "submodule ... update".
257 while test $# -ne 0
258 do
259 case "$1" in
260 -q|--quiet)
261 quiet=1
262 ;;
263 --)
264 shift
265 break
266 ;;
267 -*)
268 usage
269 ;;
270 *)
271 break
272 ;;
273 esac
274 shift
275 done
276 git ls-files --stage -- "$@" | grep -e '^160000 ' |
278 while read mode sha1 stage path
279 do
280 name=$(module_name "$path") || exit
281 url=$(git config submodule."$name".url)
282 if test -z "$url"
283 then
284 # Only mention uninitialized submodules when its
285 # path have been specified
286 test "$#" != "0" &&
287 say "Submodule path '$path' not initialized"
288 continue
289 fi
290 if ! test -d "$path"/.git
292 then
293 module_clone "$path" "$url" || exit
294 subsha1=
295 else
296 subsha1=$(unset GIT_DIR; cd "$path" &&
297 git rev-parse --verify HEAD) ||
298 die "Unable to find current revision in submodule path '$path'"
299 fi
300 if test "$subsha1" != "$sha1"
302 then
303 (unset GIT_DIR; cd "$path" && git-fetch &&
304 git-checkout -q "$sha1") ||
305 die "Unable to checkout '$sha1' in submodule path '$path'"
306 say "Submodule path '$path': checked out '$sha1'"
308 fi
309 done
310}
311set_name_rev () {
313 revname=$( (
314 unset GIT_DIR
315 cd "$1" && {
316 git describe "$2" 2>/dev/null ||
317 git describe --tags "$2" 2>/dev/null ||
318 git describe --contains --tags "$2"
319 }
320 ) )
321 test -z "$revname" || revname=" ($revname)"
322}
323#
325# List all submodules, prefixed with:
326# - submodule not initialized
327# + different revision checked out
328#
329# If --cached was specified the revision in the index will be printed
330# instead of the currently checked out revision.
331#
332# $@ = requested paths (default to all)
333#
334cmd_status()
335{
336 # parse $args after "submodule ... status".
337 while test $# -ne 0
338 do
339 case "$1" in
340 -q|--quiet)
341 quiet=1
342 ;;
343 --cached)
344 cached=1
345 ;;
346 --)
347 shift
348 break
349 ;;
350 -*)
351 usage
352 ;;
353 *)
354 break
355 ;;
356 esac
357 shift
358 done
359 git ls-files --stage -- "$@" | grep -e '^160000 ' |
361 while read mode sha1 stage path
362 do
363 name=$(module_name "$path") || exit
364 url=$(git config submodule."$name".url)
365 if test -z "$url" || ! test -d "$path"/.git
366 then
367 say "-$sha1 $path"
368 continue;
369 fi
370 set_name_rev "$path" "$sha1"
371 if git diff-files --quiet -- "$path"
372 then
373 say " $sha1 $path$revname"
374 else
375 if test -z "$cached"
376 then
377 sha1=$(unset GIT_DIR; cd "$path" && git rev-parse --verify HEAD)
378 set_name_rev "$path" "$sha1"
379 fi
380 say "+$sha1 $path$revname"
381 fi
382 done
383}
384# This loop parses the command line arguments to find the
386# subcommand name to dispatch. Parsing of the subcommand specific
387# options are primarily done by the subcommand implementations.
388# Subcommand specific options such as --branch and --cached are
389# parsed here as well, for backward compatibility.
390while test $# != 0 && test -z "$command"
392do
393 case "$1" in
394 add | init | update | status)
395 command=$1
396 ;;
397 -q|--quiet)
398 quiet=1
399 ;;
400 -b|--branch)
401 case "$2" in
402 '')
403 usage
404 ;;
405 esac
406 branch="$2"; shift
407 ;;
408 --cached)
409 cached=1
410 ;;
411 --)
412 break
413 ;;
414 -*)
415 usage
416 ;;
417 *)
418 break
419 ;;
420 esac
421 shift
422done
423# No command word defaults to "status"
425test -n "$command" || command=status
426# "-b branch" is accepted only by "add"
428if test -n "$branch" && test "$command" != add
429then
430 usage
431fi
432# "--cached" is accepted only by "status"
434if test -n "$cached" && test "$command" != status
435then
436 usage
437fi
438"cmd_$command" "$@"