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 # Guess path from repo if not specified or strip trailing slashes
157 if test -z "$path"; then
158 path=$(echo "$repo" | sed -e 's|/*$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
159 else
160 path=$(echo "$path" | sed -e 's|/*$||')
161 fi
162 git ls-files --error-unmatch "$path" > /dev/null 2>&1 &&
164 die "'$path' already exists in the index"
165 # perhaps the path exists and is already a git repo, else clone it
167 if test -e "$path"
168 then
169 if test -d "$path/.git" &&
170 test "$(unset GIT_DIR; cd $path; git rev-parse --git-dir)" = ".git"
171 then
172 echo "Adding existing repo at '$path' to the index"
173 else
174 die "'$path' already exists and is not a valid git repo"
175 fi
176 else
177 case "$repo" in
178 ./*|../*)
179 # dereference source url relative to parent's url
180 realrepo="$(resolve_relative_url $repo)" ;;
181 *)
182 # Turn the source into an absolute path if
183 # it is local
184 if base=$(get_repo_base "$repo"); then
185 repo="$base"
186 fi
187 realrepo=$repo
188 ;;
189 esac
190 module_clone "$path" "$realrepo" || exit
192 (unset GIT_DIR; cd "$path" && git checkout -q ${branch:+-b "$branch" "origin/$branch"}) ||
193 die "Unable to checkout submodule '$path'"
194 fi
195 git add "$path" ||
197 die "Failed to add submodule '$path'"
198 GIT_CONFIG=.gitmodules git config submodule."$path".path "$path" &&
200 GIT_CONFIG=.gitmodules git config submodule."$path".url "$repo" &&
201 git add .gitmodules ||
202 die "Failed to register submodule '$path'"
203}
204#
206# Register submodules in .git/config
207#
208# $@ = requested paths (default to all)
209#
210cmd_init()
211{
212 # parse $args after "submodule ... init".
213 while test $# -ne 0
214 do
215 case "$1" in
216 -q|--quiet)
217 quiet=1
218 ;;
219 --)
220 shift
221 break
222 ;;
223 -*)
224 usage
225 ;;
226 *)
227 break
228 ;;
229 esac
230 shift
231 done
232 git ls-files --stage -- "$@" | grep '^160000 ' |
234 while read mode sha1 stage path
235 do
236 # Skip already registered paths
237 name=$(module_name "$path") || exit
238 url=$(git config submodule."$name".url)
239 test -z "$url" || continue
240 url=$(GIT_CONFIG=.gitmodules git config submodule."$name".url)
242 test -z "$url" &&
243 die "No url found for submodule path '$path' in .gitmodules"
244 # Possibly a url relative to parent
246 case "$url" in
247 ./*|../*)
248 url="$(resolve_relative_url "$url")"
249 ;;
250 esac
251 git config submodule."$name".url "$url" ||
253 die "Failed to register url for submodule path '$path'"
254 say "Submodule '$name' ($url) registered for path '$path'"
256 done
257}
258#
260# Update each submodule path to correct revision, using clone and checkout as needed
261#
262# $@ = requested paths (default to all)
263#
264cmd_update()
265{
266 # parse $args after "submodule ... update".
267 while test $# -ne 0
268 do
269 case "$1" in
270 -q|--quiet)
271 quiet=1
272 ;;
273 --)
274 shift
275 break
276 ;;
277 -*)
278 usage
279 ;;
280 *)
281 break
282 ;;
283 esac
284 shift
285 done
286 git ls-files --stage -- "$@" | grep '^160000 ' |
288 while read mode sha1 stage path
289 do
290 name=$(module_name "$path") || exit
291 url=$(git config submodule."$name".url)
292 if test -z "$url"
293 then
294 # Only mention uninitialized submodules when its
295 # path have been specified
296 test "$#" != "0" &&
297 say "Submodule path '$path' not initialized"
298 continue
299 fi
300 if ! test -d "$path"/.git
302 then
303 module_clone "$path" "$url" || exit
304 subsha1=
305 else
306 subsha1=$(unset GIT_DIR; cd "$path" &&
307 git rev-parse --verify HEAD) ||
308 die "Unable to find current revision in submodule path '$path'"
309 fi
310 if test "$subsha1" != "$sha1"
312 then
313 (unset GIT_DIR; cd "$path" && git-fetch &&
314 git-checkout -q "$sha1") ||
315 die "Unable to checkout '$sha1' in submodule path '$path'"
316 say "Submodule path '$path': checked out '$sha1'"
318 fi
319 done
320}
321set_name_rev () {
323 revname=$( (
324 unset GIT_DIR
325 cd "$1" && {
326 git describe "$2" 2>/dev/null ||
327 git describe --tags "$2" 2>/dev/null ||
328 git describe --contains --tags "$2"
329 }
330 ) )
331 test -z "$revname" || revname=" ($revname)"
332}
333#
335# List all submodules, prefixed with:
336# - submodule not initialized
337# + different revision checked out
338#
339# If --cached was specified the revision in the index will be printed
340# instead of the currently checked out revision.
341#
342# $@ = requested paths (default to all)
343#
344cmd_status()
345{
346 # parse $args after "submodule ... status".
347 while test $# -ne 0
348 do
349 case "$1" in
350 -q|--quiet)
351 quiet=1
352 ;;
353 --cached)
354 cached=1
355 ;;
356 --)
357 shift
358 break
359 ;;
360 -*)
361 usage
362 ;;
363 *)
364 break
365 ;;
366 esac
367 shift
368 done
369 git ls-files --stage -- "$@" | grep '^160000 ' |
371 while read mode sha1 stage path
372 do
373 name=$(module_name "$path") || exit
374 url=$(git config submodule."$name".url)
375 if test -z "$url" || ! test -d "$path"/.git
376 then
377 say "-$sha1 $path"
378 continue;
379 fi
380 set_name_rev "$path" "$sha1"
381 if git diff-files --quiet -- "$path"
382 then
383 say " $sha1 $path$revname"
384 else
385 if test -z "$cached"
386 then
387 sha1=$(unset GIT_DIR; cd "$path" && git rev-parse --verify HEAD)
388 set_name_rev "$path" "$sha1"
389 fi
390 say "+$sha1 $path$revname"
391 fi
392 done
393}
394# This loop parses the command line arguments to find the
396# subcommand name to dispatch. Parsing of the subcommand specific
397# options are primarily done by the subcommand implementations.
398# Subcommand specific options such as --branch and --cached are
399# parsed here as well, for backward compatibility.
400while test $# != 0 && test -z "$command"
402do
403 case "$1" in
404 add | init | update | status)
405 command=$1
406 ;;
407 -q|--quiet)
408 quiet=1
409 ;;
410 -b|--branch)
411 case "$2" in
412 '')
413 usage
414 ;;
415 esac
416 branch="$2"; shift
417 ;;
418 --cached)
419 cached=1
420 ;;
421 --)
422 break
423 ;;
424 -*)
425 usage
426 ;;
427 *)
428 break
429 ;;
430 esac
431 shift
432done
433# No command word defaults to "status"
435test -n "$command" || command=status
436# "-b branch" is accepted only by "add"
438if test -n "$branch" && test "$command" != add
439then
440 usage
441fi
442# "--cached" is accepted only by "status"
444if test -n "$cached" && test "$command" != status
445then
446 usage
447fi
448"cmd_$command" "$@"