Merge branch 'jc/sha1'
[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 [--template=<template_directory>] [--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_DIR/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, $tag_top);
95                 next;
96         }
97 }
98 close FH;
99 '
100
101 quiet=
102 local=no
103 use_local=no
104 local_shared=no
105 unset template
106 no_checkout=
107 upload_pack=
108 bare=
109 reference=
110 origin=
111 origin_override=
112 use_separate_remote=
113 while
114         case "$#,$1" in
115         0,*) break ;;
116         *,-n|*,--no|*,--no-|*,--no-c|*,--no-ch|*,--no-che|*,--no-chec|\
117         *,--no-check|*,--no-checko|*,--no-checkou|*,--no-checkout)
118           no_checkout=yes ;;
119         *,--na|*,--nak|*,--nake|*,--naked|\
120         *,-b|*,--b|*,--ba|*,--bar|*,--bare) bare=yes ;;
121         *,-l|*,--l|*,--lo|*,--loc|*,--loca|*,--local) use_local=yes ;;
122         *,-s|*,--s|*,--sh|*,--sha|*,--shar|*,--share|*,--shared) 
123           local_shared=yes; use_local=yes ;;
124         1,--template) usage ;;
125         *,--template)
126                 shift; template="--template=$1" ;;
127         *,--template=*)
128           template="$1" ;;
129         *,-q|*,--quiet) quiet=-q ;;
130         *,--use-separate-remote)
131                 use_separate_remote=t ;;
132         1,--reference) usage ;;
133         *,--reference)
134                 shift; reference="$1" ;;
135         *,--reference=*)
136                 reference=`expr "z$1" : 'z--reference=\(.*\)'` ;;
137         *,-o|*,--or|*,--ori|*,--orig|*,--origi|*,--origin)
138                 case "$2" in
139                 '')
140                     usage ;;
141                 */*)
142                     echo >&2 "'$2' is not suitable for an origin name"
143                     exit 1
144                 esac
145                 git-check-ref-format "heads/$2" || {
146                     echo >&2 "'$2' is not suitable for a branch name"
147                     exit 1
148                 }
149                 test -z "$origin_override" || {
150                     echo >&2 "Do not give more than one --origin options."
151                     exit 1
152                 }
153                 origin_override=yes
154                 origin="$2"; shift
155                 ;;
156         1,-u|1,--upload-pack) usage ;;
157         *,-u|*,--upload-pack)
158                 shift
159                 upload_pack="--exec=$1" ;;
160         *,-*) usage ;;
161         *) break ;;
162         esac
163 do
164         shift
165 done
166
167 repo="$1"
168 if test -z "$repo"
169 then
170     echo >&2 'you must specify a repository to clone.'
171     exit 1
172 fi
173
174 # --bare implies --no-checkout
175 if test yes = "$bare"
176 then
177         if test yes = "$origin_override"
178         then
179                 echo >&2 '--bare and --origin $origin options are incompatible.'
180                 exit 1
181         fi
182         if test t = "$use_separate_remote"
183         then
184                 echo >&2 '--bare and --use-separate-remote options are incompatible.'
185                 exit 1
186         fi
187         no_checkout=yes
188 fi
189
190 if test -z "$origin"
191 then
192         origin=origin
193 fi
194
195 # Turn the source into an absolute path if
196 # it is local
197 if base=$(get_repo_base "$repo"); then
198         repo="$base"
199         local=yes
200 fi
201
202 dir="$2"
203 # Try using "humanish" part of source repo if user didn't specify one
204 [ -z "$dir" ] && dir=$(echo "$repo" | sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
205 [ -e "$dir" ] && echo "$dir already exists." && usage
206 mkdir -p "$dir" &&
207 D=$(cd "$dir" && pwd) &&
208 trap 'err=$?; cd ..; rm -r "$D"; exit $err' 0
209 case "$bare" in
210 yes)
211         GIT_DIR="$D" ;;
212 *)
213         GIT_DIR="$D/.git" ;;
214 esac && export GIT_DIR && git-init-db ${template+"$template"} || usage
215
216 if test -n "$reference"
217 then
218         if test -d "$reference"
219         then
220                 if test -d "$reference/.git/objects"
221                 then
222                         reference="$reference/.git"
223                 fi
224                 reference=$(cd "$reference" && pwd)
225                 echo "$reference/objects" >"$GIT_DIR/objects/info/alternates"
226                 (cd "$reference" && tar cf - refs) |
227                 (cd "$GIT_DIR/refs" &&
228                  mkdir reference-tmp &&
229                  cd reference-tmp &&
230                  tar xf -)
231         else
232                 echo >&2 "$reference: not a local directory." && usage
233         fi
234 fi
235
236 rm -f "$GIT_DIR/CLONE_HEAD"
237
238 # We do local magic only when the user tells us to.
239 case "$local,$use_local" in
240 yes,yes)
241         ( cd "$repo/objects" ) || {
242                 echo >&2 "-l flag seen but $repo is not local."
243                 exit 1
244         }
245
246         case "$local_shared" in
247         no)
248             # See if we can hardlink and drop "l" if not.
249             sample_file=$(cd "$repo" && \
250                           find objects -type f -print | sed -e 1q)
251
252             # objects directory should not be empty since we are cloning!
253             test -f "$repo/$sample_file" || exit
254
255             l=
256             if ln "$repo/$sample_file" "$GIT_DIR/objects/sample" 2>/dev/null
257             then
258                     l=l
259             fi &&
260             rm -f "$GIT_DIR/objects/sample" &&
261             cd "$repo" &&
262             find objects -depth -print | cpio -pumd$l "$GIT_DIR/" || exit 1
263             ;;
264         yes)
265             mkdir -p "$GIT_DIR/objects/info"
266             echo "$repo/objects" >> "$GIT_DIR/objects/info/alternates"
267             ;;
268         esac
269         git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
270         ;;
271 *)
272         case "$repo" in
273         rsync://*)
274                 rsync $quiet -av --ignore-existing  \
275                         --exclude info "$repo/objects/" "$GIT_DIR/objects/" ||
276                 exit
277                 # Look at objects/info/alternates for rsync -- http will
278                 # support it natively and git native ones will do it on the
279                 # remote end.  Not having that file is not a crime.
280                 rsync -q "$repo/objects/info/alternates" \
281                         "$GIT_DIR/TMP_ALT" 2>/dev/null ||
282                         rm -f "$GIT_DIR/TMP_ALT"
283                 if test -f "$GIT_DIR/TMP_ALT"
284                 then
285                     ( cd "$D" &&
286                       . git-parse-remote &&
287                       resolve_alternates "$repo" <"$GIT_DIR/TMP_ALT" ) |
288                     while read alt
289                     do
290                         case "$alt" in 'bad alternate: '*) die "$alt";; esac
291                         case "$quiet" in
292                         '')     echo >&2 "Getting alternate: $alt" ;;
293                         esac
294                         rsync $quiet -av --ignore-existing  \
295                             --exclude info "$alt" "$GIT_DIR/objects" || exit
296                     done
297                     rm -f "$GIT_DIR/TMP_ALT"
298                 fi
299                 git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
300                 ;;
301         http://*)
302                 if test -z "@@NO_CURL@@"
303                 then
304                         clone_dumb_http "$repo" "$D"
305                 else
306                         echo >&2 "http transport not supported, rebuild Git with curl support"
307                         exit 1
308                 fi
309                 ;;
310         *)
311                 cd "$D" && case "$upload_pack" in
312                 '') git-fetch-pack --all -k $quiet "$repo" ;;
313                 *) git-fetch-pack --all -k $quiet "$upload_pack" "$repo" ;;
314                 esac >"$GIT_DIR/CLONE_HEAD" || {
315                         echo >&2 "fetch-pack from '$repo' failed."
316                         exit 1
317                 }
318                 ;;
319         esac
320         ;;
321 esac
322 test -d "$GIT_DIR/refs/reference-tmp" && rm -fr "$GIT_DIR/refs/reference-tmp"
323
324 if test -f "$GIT_DIR/CLONE_HEAD"
325 then
326         # Read git-fetch-pack -k output and store the remote branches.
327         perl -e "$copy_refs" "$GIT_DIR" "$use_separate_remote" "$origin"
328 fi
329
330 cd "$D" || exit
331
332 if test -z "$bare" && test -f "$GIT_DIR/REMOTE_HEAD"
333 then
334         # Figure out which remote branch HEAD points at.
335         case "$use_separate_remote" in
336         '')     remote_top=refs/heads ;;
337         *)      remote_top="refs/remotes/$origin" ;;
338         esac
339
340         head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
341         case "$head_sha1" in
342         'ref: refs/'*)
343                 # Uh-oh, the remote told us (http transport done against
344                 # new style repository with a symref HEAD).
345                 # Ideally we should skip the guesswork but for now
346                 # opt for minimum change.
347                 head_sha1=`expr "z$head_sha1" : 'zref: refs/heads/\(.*\)'`
348                 head_sha1=`cat "$GIT_DIR/$remote_top/$head_sha1"`
349                 ;;
350         esac
351
352         # The name under $remote_top the remote HEAD seems to point at.
353         head_points_at=$(
354                 (
355                         echo "master"
356                         cd "$GIT_DIR/$remote_top" &&
357                         find . -type f -print | sed -e 's/^\.\///'
358                 ) | (
359                 done=f
360                 while read name
361                 do
362                         test t = $done && continue
363                         branch_tip=`cat "$GIT_DIR/$remote_top/$name"`
364                         if test "$head_sha1" = "$branch_tip"
365                         then
366                                 echo "$name"
367                                 done=t
368                         fi
369                 done
370                 )
371         )
372
373         # Write out remotes/$origin file, and update our "$head_points_at".
374         case "$head_points_at" in
375         ?*)
376                 mkdir -p "$GIT_DIR/remotes" &&
377                 git-symbolic-ref HEAD "refs/heads/$head_points_at" &&
378                 case "$use_separate_remote" in
379                 t)      origin_track="$remote_top/$head_points_at"
380                         git-update-ref HEAD "$head_sha1" ;;
381                 *)      origin_track="$remote_top/$origin"
382                         git-update-ref "refs/heads/$origin" "$head_sha1" ;;
383                 esac &&
384                 echo >"$GIT_DIR/remotes/$origin" \
385                 "URL: $repo
386 Pull: refs/heads/$head_points_at:$origin_track" &&
387                 (cd "$GIT_DIR/$remote_top" && find . -type f -print) |
388                 while read dotslref
389                 do
390                         name=`expr "$dotslref" : './\(.*\)'`
391                         if test "z$head_points_at" = "z$name"
392                         then
393                                 continue
394                         fi
395                         if test "$use_separate_remote" = '' &&
396                            test "z$origin" = "z$name"
397                         then
398                                 continue
399                         fi
400                         echo "Pull: refs/heads/${name}:$remote_top/${name}"
401                 done >>"$GIT_DIR/remotes/$origin" &&
402                 case "$use_separate_remote" in
403                 t)
404                         rm -f "refs/remotes/$origin/HEAD"
405                         git-symbolic-ref "refs/remotes/$origin/HEAD" \
406                                 "refs/remotes/$origin/$head_points_at"
407                 esac
408         esac
409
410         case "$no_checkout" in
411         '')
412                 git-read-tree -m -u -v HEAD HEAD
413         esac
414 fi
415 rm -f "$GIT_DIR/CLONE_HEAD" "$GIT_DIR/REMOTE_HEAD"
416
417 trap - 0
418