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