Shell utilities: Guard against expr' magic tokens.
[git/git.git] / git-clone.sh
1 #!/bin/sh
2 #
3 # Copyright (c) 2005, Linus Torvalds
4 # Copyright (c) 2005, Junio C Hamano
5 #
6 # Clone a repository into a different directory that does not yet exist.
7
8 # See git-sh-setup why.
9 unset CDPATH
10
11 usage() {
12 echo >&2 "Usage: $0 [--use-separate-remote] [--reference <reference-repo>] [--bare] [-l [-s]] [-q] [-u <upload-pack>] [--origin <name>] [-n] <repo> [<dir>]"
13 exit 1
14 }
15
16 get_repo_base() {
17 (cd "$1" && (cd .git ; pwd)) 2> /dev/null
18 }
19
20 if [ -n "$GIT_SSL_NO_VERIFY" ]; then
21 curl_extra_args="-k"
22 fi
23
24 http_fetch () {
25 # $1 = Remote, $2 = Local
26 curl -nsfL $curl_extra_args "$1" >"$2"
27 }
28
29 clone_dumb_http () {
30 # $1 - remote, $2 - local
31 cd "$2" &&
32 clone_tmp='.git/clone-tmp' &&
33 mkdir -p "$clone_tmp" || exit 1
34 http_fetch "$1/info/refs" "$clone_tmp/refs" || {
35 echo >&2 "Cannot get remote repository information.
36 Perhaps git-update-server-info needs to be run there?"
37 exit 1;
38 }
39 while read sha1 refname
40 do
41 name=`expr "z$refname" : 'zrefs/\(.*\)'` &&
42 case "$name" in
43 *^*) continue;;
44 esac
45 if test -n "$use_separate_remote" &&
46 branch_name=`expr "z$name" : 'zheads/\(.*\)'`
47 then
48 tname="remotes/$origin/$branch_name"
49 else
50 tname=$name
51 fi
52 git-http-fetch -v -a -w "$tname" "$name" "$1/" || exit 1
53 done <"$clone_tmp/refs"
54 rm -fr "$clone_tmp"
55 http_fetch "$1/HEAD" "$GIT_DIR/REMOTE_HEAD" ||
56 rm -f "$GIT_DIR/REMOTE_HEAD"
57 }
58
59 # Read git-fetch-pack -k output and store the remote branches.
60 copy_refs='
61 use File::Path qw(mkpath);
62 use File::Basename qw(dirname);
63 my $git_dir = $ARGV[0];
64 my $use_separate_remote = $ARGV[1];
65 my $origin = $ARGV[2];
66
67 my $branch_top = ($use_separate_remote ? "remotes/$origin" : "heads");
68 my $tag_top = "tags";
69
70 sub store {
71 my ($sha1, $name, $top) = @_;
72 $name = "$git_dir/refs/$top/$name";
73 mkpath(dirname($name));
74 open O, ">", "$name";
75 print O "$sha1\n";
76 close O;
77 }
78
79 open FH, "<", "$git_dir/CLONE_HEAD";
80 while (<FH>) {
81 my ($sha1, $name) = /^([0-9a-f]{40})\s(.*)$/;
82 next if ($name =~ /\^\173/);
83 if ($name eq "HEAD") {
84 open O, ">", "$git_dir/REMOTE_HEAD";
85 print O "$sha1\n";
86 close O;
87 next;
88 }
89 if ($name =~ s/^refs\/heads\///) {
90 store($sha1, $name, $branch_top);
91 next;
92 }
93 if ($name =~ s/^refs\/tags\///) {
94 store($sha1, $name, $tag_top);
95 next;
96 }
97 }
98 close FH;
99 '
100
101 quiet=
102 local=no
103 use_local=no
104 local_shared=no
105 no_checkout=
106 upload_pack=
107 bare=
108 reference=
109 origin=
110 origin_override=
111 use_separate_remote=
112 while
113 case "$#,$1" in
114 0,*) break ;;
115 *,-n|*,--no|*,--no-|*,--no-c|*,--no-ch|*,--no-che|*,--no-chec|\
116 *,--no-check|*,--no-checko|*,--no-checkou|*,--no-checkout)
117 no_checkout=yes ;;
118 *,--na|*,--nak|*,--nake|*,--naked|\
119 *,-b|*,--b|*,--ba|*,--bar|*,--bare) bare=yes ;;
120 *,-l|*,--l|*,--lo|*,--loc|*,--loca|*,--local) use_local=yes ;;
121 *,-s|*,--s|*,--sh|*,--sha|*,--shar|*,--share|*,--shared)
122 local_shared=yes; use_local=yes ;;
123 *,-q|*,--quiet) quiet=-q ;;
124 *,--use-separate-remote)
125 use_separate_remote=t ;;
126 1,--reference) usage ;;
127 *,--reference)
128 shift; reference="$1" ;;
129 *,--reference=*)
130 reference=`expr "$1" : '--reference=\(.*\)'` ;;
131 *,-o|*,--or|*,--ori|*,--orig|*,--origi|*,--origin)
132 case "$2" in
133 '')
134 usage ;;
135 */*)
136 echo >&2 "'$2' is not suitable for an origin name"
137 exit 1
138 esac
139 git-check-ref-format "heads/$2" || {
140 echo >&2 "'$2' is not suitable for a branch name"
141 exit 1
142 }
143 test -z "$origin_override" || {
144 echo >&2 "Do not give more than one --origin options."
145 exit 1
146 }
147 origin_override=yes
148 origin="$2"; shift
149 ;;
150 1,-u|1,--upload-pack) usage ;;
151 *,-u|*,--upload-pack)
152 shift
153 upload_pack="--exec=$1" ;;
154 *,-*) usage ;;
155 *) break ;;
156 esac
157 do
158 shift
159 done
160
161 repo="$1"
162 if test -z "$repo"
163 then
164 echo >&2 'you must specify a repository to clone.'
165 exit 1
166 fi
167
168 # --bare implies --no-checkout
169 if test yes = "$bare"
170 then
171 if test yes = "$origin_override"
172 then
173 echo >&2 '--bare and --origin $origin options are incompatible.'
174 exit 1
175 fi
176 if test t = "$use_separate_remote"
177 then
178 echo >&2 '--bare and --use-separate-remote options are incompatible.'
179 exit 1
180 fi
181 no_checkout=yes
182 fi
183
184 if test -z "$origin"
185 then
186 origin=origin
187 fi
188
189 # Turn the source into an absolute path if
190 # it is local
191 if base=$(get_repo_base "$repo"); then
192 repo="$base"
193 local=yes
194 fi
195
196 dir="$2"
197 # Try using "humanish" part of source repo if user didn't specify one
198 [ -z "$dir" ] && dir=$(echo "$repo" | sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
199 [ -e "$dir" ] && echo "$dir already exists." && usage
200 mkdir -p "$dir" &&
201 D=$(cd "$dir" && pwd) &&
202 trap 'err=$?; cd ..; rm -r "$D"; exit $err' exit
203 case "$bare" in
204 yes) GIT_DIR="$D" ;;
205 *) GIT_DIR="$D/.git" ;;
206 esac && export GIT_DIR && git-init-db || usage
207 case "$bare" in
208 yes)
209 GIT_DIR="$D" ;;
210 *)
211 GIT_DIR="$D/.git" ;;
212 esac
213
214 if test -n "$reference"
215 then
216 if test -d "$reference"
217 then
218 if test -d "$reference/.git/objects"
219 then
220 reference="$reference/.git"
221 fi
222 reference=$(cd "$reference" && pwd)
223 echo "$reference/objects" >"$GIT_DIR/objects/info/alternates"
224 (cd "$reference" && tar cf - refs) |
225 (cd "$GIT_DIR/refs" &&
226 mkdir reference-tmp &&
227 cd reference-tmp &&
228 tar xf -)
229 else
230 echo >&2 "$reference: not a local directory." && usage
231 fi
232 fi
233
234 rm -f "$GIT_DIR/CLONE_HEAD"
235
236 # We do local magic only when the user tells us to.
237 case "$local,$use_local" in
238 yes,yes)
239 ( cd "$repo/objects" ) || {
240 echo >&2 "-l flag seen but $repo is not local."
241 exit 1
242 }
243
244 case "$local_shared" in
245 no)
246 # See if we can hardlink and drop "l" if not.
247 sample_file=$(cd "$repo" && \
248 find objects -type f -print | sed -e 1q)
249
250 # objects directory should not be empty since we are cloning!
251 test -f "$repo/$sample_file" || exit
252
253 l=
254 if ln "$repo/$sample_file" "$GIT_DIR/objects/sample" 2>/dev/null
255 then
256 l=l
257 fi &&
258 rm -f "$GIT_DIR/objects/sample" &&
259 cd "$repo" &&
260 find objects -depth -print | cpio -pumd$l "$GIT_DIR/" || exit 1
261 ;;
262 yes)
263 mkdir -p "$GIT_DIR/objects/info"
264 {
265 test -f "$repo/objects/info/alternates" &&
266 cat "$repo/objects/info/alternates";
267 echo "$repo/objects"
268 } >"$GIT_DIR/objects/info/alternates"
269 ;;
270 esac
271 git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
272 ;;
273 *)
274 case "$repo" in
275 rsync://*)
276 rsync $quiet -av --ignore-existing \
277 --exclude info "$repo/objects/" "$GIT_DIR/objects/" ||
278 exit
279 # Look at objects/info/alternates for rsync -- http will
280 # support it natively and git native ones will do it on the
281 # remote end. Not having that file is not a crime.
282 rsync -q "$repo/objects/info/alternates" \
283 "$GIT_DIR/TMP_ALT" 2>/dev/null ||
284 rm -f "$GIT_DIR/TMP_ALT"
285 if test -f "$GIT_DIR/TMP_ALT"
286 then
287 ( cd "$D" &&
288 . git-parse-remote &&
289 resolve_alternates "$repo" <"$GIT_DIR/TMP_ALT" ) |
290 while read alt
291 do
292 case "$alt" in 'bad alternate: '*) die "$alt";; esac
293 case "$quiet" in
294 '') echo >&2 "Getting alternate: $alt" ;;
295 esac
296 rsync $quiet -av --ignore-existing \
297 --exclude info "$alt" "$GIT_DIR/objects" || exit
298 done
299 rm -f "$GIT_DIR/TMP_ALT"
300 fi
301 git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
302 ;;
303 http://*)
304 if test -z "@@NO_CURL@@"
305 then
306 clone_dumb_http "$repo" "$D"
307 else
308 echo >&2 "http transport not supported, rebuild Git with curl support"
309 exit 1
310 fi
311 ;;
312 *)
313 cd "$D" && case "$upload_pack" in
314 '') git-fetch-pack --all -k $quiet "$repo" ;;
315 *) git-fetch-pack --all -k $quiet "$upload_pack" "$repo" ;;
316 esac >"$GIT_DIR/CLONE_HEAD" || {
317 echo >&2 "fetch-pack from '$repo' failed."
318 exit 1
319 }
320 ;;
321 esac
322 ;;
323 esac
324 test -d "$GIT_DIR/refs/reference-tmp" && rm -fr "$GIT_DIR/refs/reference-tmp"
325
326 if test -f "$GIT_DIR/CLONE_HEAD"
327 then
328 # Read git-fetch-pack -k output and store the remote branches.
329 perl -e "$copy_refs" "$GIT_DIR" "$use_separate_remote" "$origin"
330 fi
331
332 cd "$D" || exit
333
334 if test -z "$bare" && test -f "$GIT_DIR/REMOTE_HEAD"
335 then
336 # Figure out which remote branch HEAD points at.
337 case "$use_separate_remote" in
338 '') remote_top=refs/heads ;;
339 *) remote_top="refs/remotes/$origin" ;;
340 esac
341
342 head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
343 case "$head_sha1" in
344 'ref: refs/'*)
345 # Uh-oh, the remote told us (http transport done against
346 # new style repository with a symref HEAD).
347 # Ideally we should skip the guesswork but for now
348 # opt for minimum change.
349 head_sha1=`expr "z$head_sha1" : 'zref: refs/heads/\(.*\)'`
350 head_sha1=`cat "$GIT_DIR/$remote_top/$head_sha1"`
351 ;;
352 esac
353
354 # The name under $remote_top the remote HEAD seems to point at.
355 head_points_at=$(
356 (
357 echo "master"
358 cd "$GIT_DIR/$remote_top" &&
359 find . -type f -print | sed -e 's/^\.\///'
360 ) | (
361 done=f
362 while read name
363 do
364 test t = $done && continue
365 branch_tip=`cat "$GIT_DIR/$remote_top/$name"`
366 if test "$head_sha1" = "$branch_tip"
367 then
368 echo "$name"
369 done=t
370 fi
371 done
372 )
373 )
374
375 # Write out remotes/$origin file, and update our "$head_points_at".
376 case "$head_points_at" in
377 ?*)
378 mkdir -p "$GIT_DIR/remotes" &&
379 git-symbolic-ref HEAD "refs/heads/$head_points_at" &&
380 case "$use_separate_remote" in
381 t) origin_track="$remote_top/$head_points_at"
382 git-update-ref HEAD "$head_sha1" ;;
383 *) origin_track="$remote_top/$origin"
384 git-update-ref "refs/heads/$origin" "$head_sha1" ;;
385 esac &&
386 echo >"$GIT_DIR/remotes/$origin" \
387 "URL: $repo
388 Pull: refs/heads/$head_points_at:$origin_track" &&
389 (cd "$GIT_DIR/$remote_top" && find . -type f -print) |
390 while read dotslref
391 do
392 name=`expr "$dotslref" : './\(.*\)'` &&
393 test "$use_separate_remote" = '' && {
394 test "$head_points_at" = "$name" ||
395 test "$origin" = "$name"
396 } ||
397 echo "Pull: refs/heads/${name}:$remote_top/${name}"
398 done >>"$GIT_DIR/remotes/$origin" &&
399 case "$use_separate_remote" in
400 t)
401 rm -f "refs/remotes/$origin/HEAD"
402 git-symbolic-ref "refs/remotes/$origin/HEAD" \
403 "refs/remotes/$origin/$head_points_at"
404 esac
405 esac
406
407 case "$no_checkout" in
408 '')
409 git-read-tree -m -u -v HEAD HEAD
410 esac
411 fi
412 rm -f "$GIT_DIR/CLONE_HEAD" "$GIT_DIR/REMOTE_HEAD"
413
414 trap - exit
415