Make sure git_connect() always give two file descriptors.
[git] / git-parse-remote.sh
1 #!/bin/sh
2
3 # git-ls-remote could be called from outside a git managed repository;
4 # this would fail in that case and would issue an error message.
5 GIT_DIR=$(git-rev-parse --git-dir 2>/dev/null) || :;
6
7 get_data_source () {
8         case "$1" in
9         */*)
10                 echo ''
11                 ;;
12         *)
13                 if test "$(git-repo-config --get "remote.$1.url")"
14                 then
15                         echo config
16                 elif test -f "$GIT_DIR/remotes/$1"
17                 then
18                         echo remotes
19                 elif test -f "$GIT_DIR/branches/$1"
20                 then
21                         echo branches
22                 else
23                         echo ''
24                 fi ;;
25         esac
26 }
27
28 get_remote_url () {
29         data_source=$(get_data_source "$1")
30         case "$data_source" in
31         '')
32                 echo "$1"
33                 ;;
34         config)
35                 git-repo-config --get "remote.$1.url"
36                 ;;
37         remotes)
38                 sed -ne '/^URL: */{
39                         s///p
40                         q
41                 }' "$GIT_DIR/remotes/$1"
42                 ;;
43         branches)
44                 sed -e 's/#.*//' "$GIT_DIR/branches/$1"
45                 ;;
46         *)
47                 die "internal error: get-remote-url $1" ;;
48         esac
49 }
50
51 get_default_remote () {
52         curr_branch=$(git-symbolic-ref -q HEAD | sed -e 's|^refs/heads/||')
53         origin=$(git-repo-config --get "branch.$curr_branch.remote")
54         echo ${origin:-origin}
55 }
56
57 get_remote_default_refs_for_push () {
58         data_source=$(get_data_source "$1")
59         case "$data_source" in
60         '' | branches)
61                 ;; # no default push mapping, just send matching refs.
62         config)
63                 git-repo-config --get-all "remote.$1.push" ;;
64         remotes)
65                 sed -ne '/^Push: */{
66                         s///p
67                 }' "$GIT_DIR/remotes/$1" ;;
68         *)
69                 die "internal error: get-remote-default-ref-for-push $1" ;;
70         esac
71 }
72
73 # Called from canon_refs_list_for_fetch -d "$remote", which
74 # is called from get_remote_default_refs_for_fetch to grok
75 # refspecs that are retrieved from the configuration, but not
76 # from get_remote_refs_for_fetch when it deals with refspecs
77 # supplied on the command line.  $ls_remote_result has the list
78 # of refs available at remote.
79 #
80 # The first token returned is either "explicit" or "glob"; this
81 # is to help prevent randomly "globbed" ref from being chosen as
82 # a merge candidate
83 expand_refs_wildcard () {
84         first_one=yes
85         for ref
86         do
87                 lref=${ref#'+'}
88                 # a non glob pattern is given back as-is.
89                 expr "z$lref" : 'zrefs/.*/\*:refs/.*/\*$' >/dev/null || {
90                         if test -n "$first_one"
91                         then
92                                 echo "explicit"
93                                 first_one=
94                         fi
95                         echo "$ref"
96                         continue
97                 }
98
99                 # glob
100                 if test -n "$first_one"
101                 then
102                         echo "glob"
103                         first_one=
104                 fi
105                 from=`expr "z$lref" : 'z\(refs/.*/\)\*:refs/.*/\*$'`
106                 to=`expr "z$lref" : 'zrefs/.*/\*:\(refs/.*/\)\*$'`
107                 local_force=
108                 test "z$lref" = "z$ref" || local_force='+'
109                 echo "$ls_remote_result" |
110                 sed -e '/\^{}$/d' |
111                 (
112                         IFS='   '
113                         while read sha1 name
114                         do
115                                 # ignore the ones that do not start with $from
116                                 mapped=${name#"$from"}
117                                 test "z$name" = "z$mapped" && continue
118                                 echo "${local_force}${name}:${to}${mapped}"
119                         done
120                 )
121         done
122 }
123
124 # Subroutine to canonicalize remote:local notation.
125 canon_refs_list_for_fetch () {
126         # If called from get_remote_default_refs_for_fetch
127         # leave the branches in branch.${curr_branch}.merge alone,
128         # or the first one otherwise; add prefix . to the rest
129         # to prevent the secondary branches to be merged by default.
130         merge_branches=
131         curr_branch=
132         if test "$1" = "-d"
133         then
134                 shift ; remote="$1" ; shift
135                 set $(expand_refs_wildcard "$@")
136                 is_explicit="$1"
137                 shift
138                 if test "$remote" = "$(get_default_remote)"
139                 then
140                         curr_branch=$(git-symbolic-ref -q HEAD | \
141                             sed -e 's|^refs/heads/||')
142                         merge_branches=$(git-repo-config \
143                             --get-all "branch.${curr_branch}.merge")
144                 fi
145                 if test -z "$merge_branches" && test $is_explicit != explicit
146                 then
147                         merge_branches=..this.will.never.match.any.ref..
148                 fi
149         fi
150         for ref
151         do
152                 force=
153                 case "$ref" in
154                 +*)
155                         ref=$(expr "z$ref" : 'z+\(.*\)')
156                         force=+
157                         ;;
158                 esac
159                 expr "z$ref" : 'z.*:' >/dev/null || ref="${ref}:"
160                 remote=$(expr "z$ref" : 'z\([^:]*\):')
161                 local=$(expr "z$ref" : 'z[^:]*:\(.*\)')
162                 dot_prefix=.
163                 if test -z "$merge_branches"
164                 then
165                         merge_branches=$remote
166                         dot_prefix=
167                 else
168                         for merge_branch in $merge_branches
169                         do
170                             if  test "$remote" = "$merge_branch" ||
171                                 test "$local" = "$merge_branch"
172                             then
173                                     dot_prefix=
174                                     break
175                             fi
176                         done
177                 fi
178                 case "$remote" in
179                 '') remote=HEAD ;;
180                 refs/heads/* | refs/tags/* | refs/remotes/*) ;;
181                 heads/* | tags/* | remotes/* ) remote="refs/$remote" ;;
182                 *) remote="refs/heads/$remote" ;;
183                 esac
184                 case "$local" in
185                 '') local= ;;
186                 refs/heads/* | refs/tags/* | refs/remotes/*) ;;
187                 heads/* | tags/* | remotes/* ) local="refs/$local" ;;
188                 *) local="refs/heads/$local" ;;
189                 esac
190
191                 if local_ref_name=$(expr "z$local" : 'zrefs/\(.*\)')
192                 then
193                    git-check-ref-format "$local_ref_name" ||
194                    die "* refusing to create funny ref '$local_ref_name' locally"
195                 fi
196                 echo "${dot_prefix}${force}${remote}:${local}"
197         done
198 }
199
200 # Returns list of src: (no store), or src:dst (store)
201 get_remote_default_refs_for_fetch () {
202         data_source=$(get_data_source "$1")
203         case "$data_source" in
204         '')
205                 echo "HEAD:" ;;
206         config)
207                 canon_refs_list_for_fetch -d "$1" \
208                         $(git-repo-config --get-all "remote.$1.fetch") ;;
209         branches)
210                 remote_branch=$(sed -ne '/#/s/.*#//p' "$GIT_DIR/branches/$1")
211                 case "$remote_branch" in '') remote_branch=master ;; esac
212                 echo "refs/heads/${remote_branch}:refs/heads/$1"
213                 ;;
214         remotes)
215                 canon_refs_list_for_fetch -d "$1" $(sed -ne '/^Pull: */{
216                                                 s///p
217                                         }' "$GIT_DIR/remotes/$1")
218                 ;;
219         *)
220                 die "internal error: get-remote-default-ref-for-push $1" ;;
221         esac
222 }
223
224 get_remote_refs_for_push () {
225         case "$#" in
226         0) die "internal error: get-remote-refs-for-push." ;;
227         1) get_remote_default_refs_for_push "$@" ;;
228         *) shift; echo "$@" ;;
229         esac
230 }
231
232 get_remote_refs_for_fetch () {
233         case "$#" in
234         0)
235             die "internal error: get-remote-refs-for-fetch." ;;
236         1)
237             get_remote_default_refs_for_fetch "$@" ;;
238         *)
239             shift
240             tag_just_seen=
241             for ref
242             do
243                 if test "$tag_just_seen"
244                 then
245                     echo "refs/tags/${ref}:refs/tags/${ref}"
246                     tag_just_seen=
247                     continue
248                 else
249                     case "$ref" in
250                     tag)
251                         tag_just_seen=yes
252                         continue
253                         ;;
254                     esac
255                 fi
256                 canon_refs_list_for_fetch "$ref"
257             done
258             ;;
259         esac
260 }
261
262 resolve_alternates () {
263         # original URL (xxx.git)
264         top_=`expr "z$1" : 'z\([^:]*:/*[^/]*\)/'`
265         while read path
266         do
267                 case "$path" in
268                 \#* | '')
269                         continue ;;
270                 /*)
271                         echo "$top_$path/" ;;
272                 ../*)
273                         # relative -- ugly but seems to work.
274                         echo "$1/objects/$path/" ;;
275                 *)
276                         # exit code may not be caught by the reader.
277                         echo "bad alternate: $path"
278                         exit 1 ;;
279                 esac
280         done
281 }