git-clone.sh: properly configure remote even if remote's head is dangling
[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 OPTIONS_SPEC="\
12 git-clone [options] [--] <repo> [<dir>]
13 --
14 n,no-checkout        don't create a checkout
15 bare                 create a bare repository
16 naked                create a bare repository
17 l,local              to clone from a local repository
18 no-hardlinks         don't use local hardlinks, always copy
19 s,shared             setup as a shared repository
20 template=            path to the template directory
21 q,quiet              be quiet
22 reference=           reference repository
23 o,origin=            use <name> instead of 'origin' to track upstream
24 u,upload-pack=       path to git-upload-pack on the remote
25 depth=               create a shallow clone of that depth
26
27 use-separate-remote  compatibility, do not use
28 no-separate-remote   compatibility, do not use"
29
30 die() {
31         echo >&2 "$@"
32         exit 1
33 }
34
35 usage() {
36         exec "$0" -h
37 }
38
39 eval "$(echo "$OPTIONS_SPEC" | git rev-parse --parseopt -- "$@" || echo exit $?)"
40
41 get_repo_base() {
42         (
43                 cd "`/bin/pwd`" &&
44                 cd "$1" || cd "$1.git" &&
45                 {
46                         cd .git
47                         pwd
48                 }
49         ) 2>/dev/null
50 }
51
52 if [ -n "$GIT_SSL_NO_VERIFY" -o \
53         "`git config --bool http.sslVerify`" = false ]; then
54     curl_extra_args="-k"
55 fi
56
57 http_fetch () {
58         # $1 = Remote, $2 = Local
59         curl -nsfL $curl_extra_args "$1" >"$2"
60         curl_exit_status=$?
61         case $curl_exit_status in
62         126|127) exit ;;
63         *)       return $curl_exit_status ;;
64         esac
65 }
66
67 clone_dumb_http () {
68         # $1 - remote, $2 - local
69         cd "$2" &&
70         clone_tmp="$GIT_DIR/clone-tmp" &&
71         mkdir -p "$clone_tmp" || exit 1
72         if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
73                 "`git config --bool http.noEPSV`" = true ]; then
74                 curl_extra_args="${curl_extra_args} --disable-epsv"
75         fi
76         http_fetch "$1/info/refs" "$clone_tmp/refs" ||
77                 die "Cannot get remote repository information.
78 Perhaps git-update-server-info needs to be run there?"
79         test "z$quiet" = z && v=-v || v=
80         while read sha1 refname
81         do
82                 name=`expr "z$refname" : 'zrefs/\(.*\)'` &&
83                 case "$name" in
84                 *^*)    continue;;
85                 esac
86                 case "$bare,$name" in
87                 yes,* | ,heads/* | ,tags/*) ;;
88                 *)      continue ;;
89                 esac
90                 if test -n "$use_separate_remote" &&
91                    branch_name=`expr "z$name" : 'zheads/\(.*\)'`
92                 then
93                         tname="remotes/$origin/$branch_name"
94                 else
95                         tname=$name
96                 fi
97                 git-http-fetch $v -a -w "$tname" "$sha1" "$1" || exit 1
98         done <"$clone_tmp/refs"
99         rm -fr "$clone_tmp"
100         http_fetch "$1/HEAD" "$GIT_DIR/REMOTE_HEAD" ||
101         rm -f "$GIT_DIR/REMOTE_HEAD"
102         if test -f "$GIT_DIR/REMOTE_HEAD"; then
103                 head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
104                 case "$head_sha1" in
105                 'ref: refs/'*)
106                         ;;
107                 *)
108                         git-http-fetch $v -a "$head_sha1" "$1" ||
109                         rm -f "$GIT_DIR/REMOTE_HEAD"
110                         ;;
111                 esac
112         fi
113 }
114
115 quiet=
116 local=no
117 use_local_hardlink=yes
118 local_shared=no
119 unset template
120 no_checkout=
121 upload_pack=
122 bare=
123 reference=
124 origin=
125 origin_override=
126 use_separate_remote=t
127 depth=
128 no_progress=
129 local_explicitly_asked_for=
130 test -t 1 || no_progress=--no-progress
131
132 while test $# != 0
133 do
134         case "$1" in
135         -n|--no-checkout)
136                 no_checkout=yes ;;
137         --naked|--bare)
138                 bare=yes ;;
139         -l|--local)
140                 local_explicitly_asked_for=yes
141                 use_local_hardlink=yes
142                 ;;
143         --no-hardlinks)
144                 use_local_hardlink=no ;;
145         -s|--shared)
146                 local_shared=yes ;;
147         --template)
148                 shift; template="--template=$1" ;;
149         -q|--quiet)
150                 quiet=-q ;;
151         --use-separate-remote|--no-separate-remote)
152                 die "clones are always made with separate-remote layout" ;;
153         --reference)
154                 shift; reference="$1" ;;
155         -o|--origin)
156                 shift;
157                 case "$1" in
158                 '')
159                     usage ;;
160                 */*)
161                     die "'$1' is not suitable for an origin name"
162                 esac
163                 git check-ref-format "heads/$1" ||
164                     die "'$1' is not suitable for a branch name"
165                 test -z "$origin_override" ||
166                     die "Do not give more than one --origin options."
167                 origin_override=yes
168                 origin="$1"
169                 ;;
170         -u|--upload-pack)
171                 shift
172                 upload_pack="--upload-pack=$1" ;;
173         --depth)
174                 shift
175                 depth="--depth=$1" ;;
176         --)
177                 shift
178                 break ;;
179         *)
180                 usage ;;
181         esac
182         shift
183 done
184
185 repo="$1"
186 test -n "$repo" ||
187     die 'you must specify a repository to clone.'
188
189 # --bare implies --no-checkout and --no-separate-remote
190 if test yes = "$bare"
191 then
192         if test yes = "$origin_override"
193         then
194                 die '--bare and --origin $origin options are incompatible.'
195         fi
196         no_checkout=yes
197         use_separate_remote=
198 fi
199
200 if test -z "$origin"
201 then
202         origin=origin
203 fi
204
205 # Turn the source into an absolute path if
206 # it is local
207 if base=$(get_repo_base "$repo"); then
208         repo="$base"
209         if test -z "$depth"
210         then
211                 local=yes
212         fi
213 fi
214
215 dir="$2"
216 # Try using "humanish" part of source repo if user didn't specify one
217 [ -z "$dir" ] && dir=$(echo "$repo" | sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
218 [ -e "$dir" ] && die "destination directory '$dir' already exists."
219 [ yes = "$bare" ] && unset GIT_WORK_TREE
220 [ -n "$GIT_WORK_TREE" ] && [ -e "$GIT_WORK_TREE" ] &&
221 die "working tree '$GIT_WORK_TREE' already exists."
222 D=
223 W=
224 cleanup() {
225         err=$?
226         test -z "$D" && rm -rf "$dir"
227         test -z "$W" && test -n "$GIT_WORK_TREE" && rm -rf "$GIT_WORK_TREE"
228         cd ..
229         test -n "$D" && rm -rf "$D"
230         test -n "$W" && rm -rf "$W"
231         exit $err
232 }
233 trap cleanup 0
234 mkdir -p "$dir" && D=$(cd "$dir" && pwd) || usage
235 test -n "$GIT_WORK_TREE" && mkdir -p "$GIT_WORK_TREE" &&
236 W=$(cd "$GIT_WORK_TREE" && pwd) && GIT_WORK_TREE="$W" && export GIT_WORK_TREE
237 if test yes = "$bare" || test -n "$GIT_WORK_TREE"; then
238         GIT_DIR="$D"
239 else
240         GIT_DIR="$D/.git"
241 fi &&
242 export GIT_DIR &&
243 GIT_CONFIG="$GIT_DIR/config" git-init $quiet ${template+"$template"} || usage
244
245 if test -n "$bare"
246 then
247         GIT_CONFIG="$GIT_DIR/config" git config core.bare true
248 fi
249
250 if test -n "$reference"
251 then
252         ref_git=
253         if test -d "$reference"
254         then
255                 if test -d "$reference/.git/objects"
256                 then
257                         ref_git="$reference/.git"
258                 elif test -d "$reference/objects"
259                 then
260                         ref_git="$reference"
261                 fi
262         fi
263         if test -n "$ref_git"
264         then
265                 ref_git=$(cd "$ref_git" && pwd)
266                 echo "$ref_git/objects" >"$GIT_DIR/objects/info/alternates"
267                 (
268                         GIT_DIR="$ref_git" git for-each-ref \
269                                 --format='%(objectname) %(*objectname)'
270                 ) |
271                 while read a b
272                 do
273                         test -z "$a" ||
274                         git update-ref "refs/reference-tmp/$a" "$a"
275                         test -z "$b" ||
276                         git update-ref "refs/reference-tmp/$b" "$b"
277                 done
278         else
279                 die "reference repository '$reference' is not a local directory."
280         fi
281 fi
282
283 rm -f "$GIT_DIR/CLONE_HEAD"
284
285 # We do local magic only when the user tells us to.
286 case "$local" in
287 yes)
288         ( cd "$repo/objects" ) ||
289                 die "cannot chdir to local '$repo/objects'."
290
291         if test "$local_shared" = yes
292         then
293                 mkdir -p "$GIT_DIR/objects/info"
294                 echo "$repo/objects" >>"$GIT_DIR/objects/info/alternates"
295         else
296                 l= &&
297                 if test "$use_local_hardlink" = yes
298                 then
299                         # See if we can hardlink and drop "l" if not.
300                         sample_file=$(cd "$repo" && \
301                                       find objects -type f -print | sed -e 1q)
302                         # objects directory should not be empty because
303                         # we are cloning!
304                         test -f "$repo/$sample_file" ||
305                                 die "fatal: cannot clone empty repository"
306                         if ln "$repo/$sample_file" "$GIT_DIR/objects/sample" 2>/dev/null
307                         then
308                                 rm -f "$GIT_DIR/objects/sample"
309                                 l=l
310                         elif test -n "$local_explicitly_asked_for"
311                         then
312                                 echo >&2 "Warning: -l asked but cannot hardlink to $repo"
313                         fi
314                 fi &&
315                 cd "$repo" &&
316                 find objects -depth -print | cpio -pumd$l "$GIT_DIR/" || exit 1
317         fi
318         git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD" || exit 1
319         ;;
320 *)
321         case "$repo" in
322         rsync://*)
323                 case "$depth" in
324                 "") ;;
325                 *) die "shallow over rsync not supported" ;;
326                 esac
327                 rsync $quiet -av --ignore-existing  \
328                         --exclude info "$repo/objects/" "$GIT_DIR/objects/" ||
329                 exit
330                 # Look at objects/info/alternates for rsync -- http will
331                 # support it natively and git native ones will do it on the
332                 # remote end.  Not having that file is not a crime.
333                 rsync -q "$repo/objects/info/alternates" \
334                         "$GIT_DIR/TMP_ALT" 2>/dev/null ||
335                         rm -f "$GIT_DIR/TMP_ALT"
336                 if test -f "$GIT_DIR/TMP_ALT"
337                 then
338                     ( cd "$D" &&
339                       . git-parse-remote &&
340                       resolve_alternates "$repo" <"$GIT_DIR/TMP_ALT" ) |
341                     while read alt
342                     do
343                         case "$alt" in 'bad alternate: '*) die "$alt";; esac
344                         case "$quiet" in
345                         '')     echo >&2 "Getting alternate: $alt" ;;
346                         esac
347                         rsync $quiet -av --ignore-existing  \
348                             --exclude info "$alt" "$GIT_DIR/objects" || exit
349                     done
350                     rm -f "$GIT_DIR/TMP_ALT"
351                 fi
352                 git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD" || exit 1
353                 ;;
354         https://*|http://*|ftp://*)
355                 case "$depth" in
356                 "") ;;
357                 *) die "shallow over http or ftp not supported" ;;
358                 esac
359                 if test -z "@@NO_CURL@@"
360                 then
361                         clone_dumb_http "$repo" "$D"
362                 else
363                         die "http transport not supported, rebuild Git with curl support"
364                 fi
365                 ;;
366         *)
367                 case "$upload_pack" in
368                 '') git-fetch-pack --all -k $quiet $depth $no_progress "$repo";;
369                 *) git-fetch-pack --all -k $quiet "$upload_pack" $depth $no_progress "$repo" ;;
370                 esac >"$GIT_DIR/CLONE_HEAD" ||
371                         die "fetch-pack from '$repo' failed."
372                 ;;
373         esac
374         ;;
375 esac
376 test -d "$GIT_DIR/refs/reference-tmp" && rm -fr "$GIT_DIR/refs/reference-tmp"
377
378 if test -f "$GIT_DIR/CLONE_HEAD"
379 then
380         # Read git-fetch-pack -k output and store the remote branches.
381         if [ -n "$use_separate_remote" ]
382         then
383                 branch_top="remotes/$origin"
384         else
385                 branch_top="heads"
386         fi
387         tag_top="tags"
388         while read sha1 name
389         do
390                 case "$name" in
391                 *'^{}')
392                         continue ;;
393                 HEAD)
394                         destname="REMOTE_HEAD" ;;
395                 refs/heads/*)
396                         destname="refs/$branch_top/${name#refs/heads/}" ;;
397                 refs/tags/*)
398                         destname="refs/$tag_top/${name#refs/tags/}" ;;
399                 *)
400                         continue ;;
401                 esac
402                 git update-ref -m "clone: from $repo" "$destname" "$sha1" ""
403         done < "$GIT_DIR/CLONE_HEAD"
404 fi
405
406 if test -n "$W"; then
407         cd "$W" || exit
408 else
409         cd "$D" || exit
410 fi
411
412 if test -z "$bare"
413 then
414         # a non-bare repository is always in separate-remote layout
415         remote_top="refs/remotes/$origin"
416         head_sha1=
417         test ! -r "$GIT_DIR/REMOTE_HEAD" || head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
418         case "$head_sha1" in
419         'ref: refs/'*)
420                 # Uh-oh, the remote told us (http transport done against
421                 # new style repository with a symref HEAD).
422                 # Ideally we should skip the guesswork but for now
423                 # opt for minimum change.
424                 head_sha1=`expr "z$head_sha1" : 'zref: refs/heads/\(.*\)'`
425                 head_sha1=`cat "$GIT_DIR/$remote_top/$head_sha1"`
426                 ;;
427         esac
428
429         # The name under $remote_top the remote HEAD seems to point at.
430         head_points_at=$(
431                 (
432                         test -f "$GIT_DIR/$remote_top/master" && echo "master"
433                         cd "$GIT_DIR/$remote_top" &&
434                         find . -type f -print | sed -e 's/^\.\///'
435                 ) | (
436                 done=f
437                 while read name
438                 do
439                         test t = $done && continue
440                         branch_tip=`cat "$GIT_DIR/$remote_top/$name"`
441                         if test "$head_sha1" = "$branch_tip"
442                         then
443                                 echo "$name"
444                                 done=t
445                         fi
446                 done
447                 )
448         )
449
450         # Upstream URL
451         git config remote."$origin".url "$repo" &&
452
453         # Set up the mappings to track the remote branches.
454         git config remote."$origin".fetch \
455                 "+refs/heads/*:$remote_top/*" '^$' &&
456
457         # Write out remote.$origin config, and update our "$head_points_at".
458         case "$head_points_at" in
459         ?*)
460                 # Local default branch
461                 git symbolic-ref HEAD "refs/heads/$head_points_at" &&
462
463                 # Tracking branch for the primary branch at the remote.
464                 git update-ref HEAD "$head_sha1" &&
465
466                 rm -f "refs/remotes/$origin/HEAD"
467                 git symbolic-ref "refs/remotes/$origin/HEAD" \
468                         "refs/remotes/$origin/$head_points_at" &&
469
470                 git config branch."$head_points_at".remote "$origin" &&
471                 git config branch."$head_points_at".merge "refs/heads/$head_points_at"
472                 ;;
473         '')
474                 if test -z "$head_sha1"
475                 then
476                         # Source had nonexistent ref in HEAD
477                         echo >&2 "Warning: Remote HEAD refers to nonexistent ref, unable to checkout."
478                         no_checkout=t
479                 else
480                         # Source had detached HEAD pointing nowhere
481                         git update-ref --no-deref HEAD "$head_sha1" &&
482                         rm -f "refs/remotes/$origin/HEAD"
483                 fi
484                 ;;
485         esac
486
487         case "$no_checkout" in
488         '')
489                 test "z$quiet" = z -a "z$no_progress" = z && v=-v || v=
490                 git read-tree -m -u $v HEAD HEAD
491         esac
492 fi
493 rm -f "$GIT_DIR/CLONE_HEAD" "$GIT_DIR/REMOTE_HEAD"
494
495 trap - 0