rev-parse: --show-cdup
[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 [-l [-s]] [-q] [-u <upload-pack>] [-o <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         http_fetch "$1/objects/info/packs" "$clone_tmp/packs" || {
36                 echo >&2 "Cannot get remote repository information.
37 Perhaps git-update-server-info needs to be run there?"
38                 exit 1;
39         }
40         while read type name
41         do
42                 case "$type" in
43                 P) ;;
44                 *) continue ;;
45                 esac &&
46
47                 idx=`expr "$name" : '\(.*\)\.pack'`.idx
48                 http_fetch "$1/objects/pack/$name" ".git/objects/pack/$name" &&
49                 http_fetch "$1/objects/pack/$idx" ".git/objects/pack/$idx" &&
50                 git-verify-pack ".git/objects/pack/$idx" || exit 1
51         done <"$clone_tmp/packs"
52
53         while read sha1 refname
54         do
55                 name=`expr "$refname" : 'refs/\(.*\)'` &&
56                 case "$name" in
57                 *^*)    ;;
58                 *)
59                         git-http-fetch -v -a -w "$name" "$name" "$1/" || exit 1
60                 esac
61         done <"$clone_tmp/refs"
62         rm -fr "$clone_tmp"
63 }
64
65 quiet=
66 use_local=no
67 local_shared=no
68 no_checkout=
69 upload_pack=
70 origin=origin
71 while
72         case "$#,$1" in
73         0,*) break ;;
74         *,-n) no_checkout=yes ;;
75         *,-l|*,--l|*,--lo|*,--loc|*,--loca|*,--local) use_local=yes ;;
76         *,-s|*,--s|*,--sh|*,--sha|*,--shar|*,--share|*,--shared) 
77           local_shared=yes; use_local=yes ;;
78         *,-q|*,--quiet) quiet=-q ;;
79         1,-o) usage;;
80         *,-o)
81                 git-check-ref-format "$2" || {
82                     echo >&2 "'$2' is not suitable for a branch name"
83                     exit 1
84                 }
85                 origin="$2"; shift
86                 ;;
87         1,-u|1,--upload-pack) usage ;;
88         *,-u|*,--upload-pack)
89                 shift
90                 upload_pack="--exec=$1" ;;
91         *,-*) usage ;;
92         *) break ;;
93         esac
94 do
95         shift
96 done
97
98 # Turn the source into an absolute path if
99 # it is local
100 repo="$1"
101 local=no
102 if base=$(get_repo_base "$repo"); then
103         repo="$base"
104         local=yes
105 fi
106
107 dir="$2"
108 # Try using "humanish" part of source repo if user didn't specify one
109 [ -z "$dir" ] && dir=$(echo "$repo" | sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*/||g')
110 [ -e "$dir" ] && echo "$dir already exists." && usage
111 mkdir -p "$dir" &&
112 D=$(
113         (cd "$dir" && git-init-db && pwd)
114 ) &&
115 test -d "$D" || usage
116
117 # We do local magic only when the user tells us to.
118 case "$local,$use_local" in
119 yes,yes)
120         ( cd "$repo/objects" ) || {
121                 echo >&2 "-l flag seen but $repo is not local."
122                 exit 1
123         }
124
125         case "$local_shared" in
126         no)
127             # See if we can hardlink and drop "l" if not.
128             sample_file=$(cd "$repo" && \
129                           find objects -type f -print | sed -e 1q)
130
131             # objects directory should not be empty since we are cloning!
132             test -f "$repo/$sample_file" || exit
133
134             l=
135             if ln "$repo/$sample_file" "$D/.git/objects/sample" 2>/dev/null
136             then
137                     l=l
138             fi &&
139             rm -f "$D/.git/objects/sample" &&
140             cd "$repo" &&
141             find objects -depth -print | cpio -puamd$l "$D/.git/" || exit 1
142             ;;
143         yes)
144             mkdir -p "$D/.git/objects/info"
145             {
146                 test -f "$repo/objects/info/alternates" &&
147                 cat "$repo/objects/info/alternates";
148                 echo "$repo/objects"
149             } >"$D/.git/objects/info/alternates"
150             ;;
151         esac
152
153         # Make a duplicate of refs and HEAD pointer
154         HEAD=
155         if test -f "$repo/HEAD"
156         then
157                 HEAD=HEAD
158         fi
159         (cd "$repo" && tar cf - refs $HEAD) |
160         (cd "$D/.git" && tar xf -) || exit 1
161         ;;
162 *)
163         case "$repo" in
164         rsync://*)
165                 rsync $quiet -av --ignore-existing  \
166                         --exclude info "$repo/objects/" "$D/.git/objects/" &&
167                 rsync $quiet -av --ignore-existing  \
168                         --exclude info "$repo/refs/" "$D/.git/refs/" || exit
169
170                 # Look at objects/info/alternates for rsync -- http will
171                 # support it natively and git native ones will do it on the
172                 # remote end.  Not having that file is not a crime.
173                 rsync -q "$repo/objects/info/alternates" \
174                         "$D/.git/TMP_ALT" 2>/dev/null ||
175                         rm -f "$D/.git/TMP_ALT"
176                 if test -f "$D/.git/TMP_ALT"
177                 then
178                     ( cd "$D" &&
179                       . git-parse-remote &&
180                       resolve_alternates "$repo" <"./.git/TMP_ALT" ) |
181                     while read alt
182                     do
183                         case "$alt" in 'bad alternate: '*) die "$alt";; esac
184                         case "$quiet" in
185                         '')     echo >&2 "Getting alternate: $alt" ;;
186                         esac
187                         rsync $quiet -av --ignore-existing  \
188                             --exclude info "$alt" "$D/.git/objects" || exit
189                     done
190                     rm -f "$D/.git/TMP_ALT"
191                 fi
192                 ;;
193         http://*)
194                 clone_dumb_http "$repo" "$D"
195                 ;;
196         *)
197                 cd "$D" && case "$upload_pack" in
198                 '') git-clone-pack $quiet "$repo" ;;
199                 *) git-clone-pack $quiet "$upload_pack" "$repo" ;;
200                 esac || {
201                         echo >&2 "clone-pack from '$repo' failed."
202                         exit 1
203                 }
204                 ;;
205         esac
206         ;;
207 esac
208
209 cd "$D" || exit
210
211 if test -f ".git/HEAD"
212 then
213         head_points_at=`git-symbolic-ref HEAD`
214         case "$head_points_at" in
215         refs/heads/*)
216                 head_points_at=`expr "$head_points_at" : 'refs/heads/\(.*\)'`
217                 mkdir -p .git/remotes &&
218                 echo >.git/remotes/origin \
219                 "URL: $repo
220 Pull: $head_points_at:$origin" &&
221                 git-update-ref "refs/heads/$origin" $(git-rev-parse HEAD) &&
222                 find .git/refs/heads -type f -print |
223                 while read ref
224                 do
225                         head=`expr "$ref" : '.git/refs/heads/\(.*\)'` &&
226                         test "$head_points_at" = "$head" ||
227                         test "$origin" = "$head" ||
228                         echo "Pull: ${head}:${head}"
229                 done >>.git/remotes/origin
230         esac
231
232         case "$no_checkout" in
233         '')
234                 git checkout
235         esac
236 fi