rev-parse: tighten constness properly.
[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 "$2" &&
32         clone_tmp='.git/clone-tmp' &&
33         mkdir -p "$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 "$1" : '--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) GIT_DIR="$D" ;;
211 *) GIT_DIR="$D/.git" ;;
212 esac && export GIT_DIR && git-init-db ${template+"$template"} || usage
213 case "$bare" in
214 yes)
215         GIT_DIR="$D" ;;
216 *)
217         GIT_DIR="$D/.git" ;;
218 esac
219
220 if test -n "$reference"
221 then
222         if test -d "$reference"
223         then
224                 if test -d "$reference/.git/objects"
225                 then
226                         reference="$reference/.git"
227                 fi
228                 reference=$(cd "$reference" && pwd)
229                 echo "$reference/objects" >"$GIT_DIR/objects/info/alternates"
230                 (cd "$reference" && tar cf - refs) |
231                 (cd "$GIT_DIR/refs" &&
232                  mkdir reference-tmp &&
233                  cd reference-tmp &&
234                  tar xf -)
235         else
236                 echo >&2 "$reference: not a local directory." && usage
237         fi
238 fi
239
240 rm -f "$GIT_DIR/CLONE_HEAD"
241
242 # We do local magic only when the user tells us to.
243 case "$local,$use_local" in
244 yes,yes)
245         ( cd "$repo/objects" ) || {
246                 echo >&2 "-l flag seen but $repo is not local."
247                 exit 1
248         }
249
250         case "$local_shared" in
251         no)
252             # See if we can hardlink and drop "l" if not.
253             sample_file=$(cd "$repo" && \
254                           find objects -type f -print | sed -e 1q)
255
256             # objects directory should not be empty since we are cloning!
257             test -f "$repo/$sample_file" || exit
258
259             l=
260             if ln "$repo/$sample_file" "$GIT_DIR/objects/sample" 2>/dev/null
261             then
262                     l=l
263             fi &&
264             rm -f "$GIT_DIR/objects/sample" &&
265             cd "$repo" &&
266             find objects -depth -print | cpio -pumd$l "$GIT_DIR/" || exit 1
267             ;;
268         yes)
269             mkdir -p "$GIT_DIR/objects/info"
270             echo "$repo/objects" >> "$GIT_DIR/objects/info/alternates"
271             ;;
272         esac
273         git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
274         ;;
275 *)
276         case "$repo" in
277         rsync://*)
278                 rsync $quiet -av --ignore-existing  \
279                         --exclude info "$repo/objects/" "$GIT_DIR/objects/" ||
280                 exit
281                 # Look at objects/info/alternates for rsync -- http will
282                 # support it natively and git native ones will do it on the
283                 # remote end.  Not having that file is not a crime.
284                 rsync -q "$repo/objects/info/alternates" \
285                         "$GIT_DIR/TMP_ALT" 2>/dev/null ||
286                         rm -f "$GIT_DIR/TMP_ALT"
287                 if test -f "$GIT_DIR/TMP_ALT"
288                 then
289                     ( cd "$D" &&
290                       . git-parse-remote &&
291                       resolve_alternates "$repo" <"$GIT_DIR/TMP_ALT" ) |
292                     while read alt
293                     do
294                         case "$alt" in 'bad alternate: '*) die "$alt";; esac
295                         case "$quiet" in
296                         '')     echo >&2 "Getting alternate: $alt" ;;
297                         esac
298                         rsync $quiet -av --ignore-existing  \
299                             --exclude info "$alt" "$GIT_DIR/objects" || exit
300                     done
301                     rm -f "$GIT_DIR/TMP_ALT"
302                 fi
303                 git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
304                 ;;
305         http://*)
306                 if test -z "@@NO_CURL@@"
307                 then
308                         clone_dumb_http "$repo" "$D"
309                 else
310                         echo >&2 "http transport not supported, rebuild Git with curl support"
311                         exit 1
312                 fi
313                 ;;
314         *)
315                 cd "$D" && case "$upload_pack" in
316                 '') git-fetch-pack --all -k $quiet "$repo" ;;
317                 *) git-fetch-pack --all -k $quiet "$upload_pack" "$repo" ;;
318                 esac >"$GIT_DIR/CLONE_HEAD" || {
319                         echo >&2 "fetch-pack from '$repo' failed."
320                         exit 1
321                 }
322                 ;;
323         esac
324         ;;
325 esac
326 test -d "$GIT_DIR/refs/reference-tmp" && rm -fr "$GIT_DIR/refs/reference-tmp"
327
328 if test -f "$GIT_DIR/CLONE_HEAD"
329 then
330         # Read git-fetch-pack -k output and store the remote branches.
331         perl -e "$copy_refs" "$GIT_DIR" "$use_separate_remote" "$origin"
332 fi
333
334 cd "$D" || exit
335
336 if test -z "$bare" && test -f "$GIT_DIR/REMOTE_HEAD"
337 then
338         # Figure out which remote branch HEAD points at.
339         case "$use_separate_remote" in
340         '')     remote_top=refs/heads ;;
341         *)      remote_top="refs/remotes/$origin" ;;
342         esac
343
344         head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
345         case "$head_sha1" in
346         'ref: refs/'*)
347                 # Uh-oh, the remote told us (http transport done against
348                 # new style repository with a symref HEAD).
349                 # Ideally we should skip the guesswork but for now
350                 # opt for minimum change.
351                 head_sha1=`expr "z$head_sha1" : 'zref: refs/heads/\(.*\)'`
352                 head_sha1=`cat "$GIT_DIR/$remote_top/$head_sha1"`
353                 ;;
354         esac
355
356         # The name under $remote_top the remote HEAD seems to point at.
357         head_points_at=$(
358                 (
359                         echo "master"
360                         cd "$GIT_DIR/$remote_top" &&
361                         find . -type f -print | sed -e 's/^\.\///'
362                 ) | (
363                 done=f
364                 while read name
365                 do
366                         test t = $done && continue
367                         branch_tip=`cat "$GIT_DIR/$remote_top/$name"`
368                         if test "$head_sha1" = "$branch_tip"
369                         then
370                                 echo "$name"
371                                 done=t
372                         fi
373                 done
374                 )
375         )
376
377         # Write out remotes/$origin file, and update our "$head_points_at".
378         case "$head_points_at" in
379         ?*)
380                 mkdir -p "$GIT_DIR/remotes" &&
381                 git-symbolic-ref HEAD "refs/heads/$head_points_at" &&
382                 case "$use_separate_remote" in
383                 t)      origin_track="$remote_top/$head_points_at"
384                         git-update-ref HEAD "$head_sha1" ;;
385                 *)      origin_track="$remote_top/$origin"
386                         git-update-ref "refs/heads/$origin" "$head_sha1" ;;
387                 esac &&
388                 echo >"$GIT_DIR/remotes/$origin" \
389                 "URL: $repo
390 Pull: refs/heads/$head_points_at:$origin_track" &&
391                 (cd "$GIT_DIR/$remote_top" && find . -type f -print) |
392                 while read dotslref
393                 do
394                         name=`expr "$dotslref" : './\(.*\)'` &&
395                         test "$use_separate_remote" = '' && {
396                                 test "$head_points_at" = "$name" ||
397                                 test "$origin" = "$name"
398                         } ||
399                         echo "Pull: refs/heads/${name}:$remote_top/${name}"
400                 done >>"$GIT_DIR/remotes/$origin" &&
401                 case "$use_separate_remote" in
402                 t)
403                         rm -f "refs/remotes/$origin/HEAD"
404                         git-symbolic-ref "refs/remotes/$origin/HEAD" \
405                                 "refs/remotes/$origin/$head_points_at"
406                 esac
407         esac
408
409         case "$no_checkout" in
410         '')
411                 git-read-tree -m -u -v HEAD HEAD
412         esac
413 fi
414 rm -f "$GIT_DIR/CLONE_HEAD" "$GIT_DIR/REMOTE_HEAD"
415
416 trap - 0
417