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 "$1" in
   9         */*)
  10                 # Not so fast.  This could be the partial URL shorthand...
  11                 token=$(expr "z$1" : 'z\([^/]*\)/')
  12                 remainder=$(expr "z$1" : 'z[^/]*/\(.*\)')
  13                 if test "$(git-repo-config --get "remote.$token.url")"
  14                 then
  15                         echo config-partial
  16                 elif test -f "$GIT_DIR/branches/$token"
  17                 then
  18                         echo branches-partial
  19                 else
  20                         echo ''
  21                 fi
  22                 ;;
  23         *)
  24                 if test "$(git-repo-config --get "remote.$1.url")"
  25                 then
  26                         echo config
  27                 elif test -f "$GIT_DIR/remotes/$1"
  28                 then
  29                         echo remotes
  30                 elif test -f "$GIT_DIR/branches/$1"
  31                 then
  32                         echo branches
  33                 else
  34                         echo ''
  35                 fi ;;
  36         esac
  37 }
  38
  39 get_remote_url () {
  40         data_source=$(get_data_source "$1")
  41         case "$data_source" in
  42         '')
  43                 echo "$1" ;;
  44         config-partial)
  45                 token=$(expr "z$1" : 'z\([^/]*\)/')
  46                 remainder=$(expr "z$1" : 'z[^/]*/\(.*\)')
  47                 url=$(git-repo-config --get "remote.$token.url")
  48                 echo "$url/$remainder"
  49                 ;;
  50         config)
  51                 git-repo-config --get "remote.$1.url"
  52                 ;;
  53         remotes)
  54                 sed -ne '/^URL: */{
  55                         s///p
  56                         q
  57                 }' "$GIT_DIR/remotes/$1" ;;
  58         branches)
  59                 sed -e 's/#.*//' "$GIT_DIR/branches/$1" ;;
  60         branches-partial)
  61                 token=$(expr "z$1" : 'z\([^/]*\)/')
  62                 remainder=$(expr "z$1" : 'z[^/]*/\(.*\)')
  63                 url=$(sed -e 's/#.*//' "$GIT_DIR/branches/$token")
  64                 echo "$url/$remainder"
  65                 ;;
  66         *)
  67                 die "internal error: get-remote-url $1" ;;
  68         esac
  69 }
  70
  71 get_default_remote () {
  72         curr_branch=$(git-symbolic-ref HEAD | sed -e 's|^refs/heads/||')
  73         origin=$(git-repo-config --get "branch.$curr_branch.remote")
  74         echo ${origin:-origin}
  75 }
  76
  77 get_remote_default_refs_for_push () {
  78         data_source=$(get_data_source "$1")
  79         case "$data_source" in
  80         '' | config-partial | branches | branches-partial)
  81                 ;; # no default push mapping, just send matching refs.
  82         config)
  83                 git-repo-config --get-all "remote.$1.push" ;;
  84         remotes)
  85                 sed -ne '/^Push: */{
  86                         s///p
  87                 }' "$GIT_DIR/remotes/$1" ;;
  88         *)
  89                 die "internal error: get-remote-default-ref-for-push $1" ;;
  90         esac
  91 }
  92
  93 # Called from canon_refs_list_for_fetch -d "$remote", which
  94 # is called from get_remote_default_refs_for_fetch to grok
  95 # refspecs that are retrieved from the configuration, but not
  96 # from get_remote_refs_for_fetch when it deals with refspecs
  97 # supplied on the command line.  $ls_remote_result has the list
  98 # of refs available at remote.
  99 expand_refs_wildcard () {
 100         for ref
 101         do
 102                 lref=${ref#'+'}
 103                 # a non glob pattern is given back as-is.
 104                 expr "z$lref" : 'zrefs/.*/\*:refs/.*/\*$' >/dev/null || {
 105                         echo "$ref"
 106                         continue
 107                 }
 108
 109                 from=`expr "z$lref" : 'z\(refs/.*/\)\*:refs/.*/\*$'`
 110                 to=`expr "z$lref" : 'zrefs/.*/\*:\(refs/.*/\)\*$'`
 111                 local_force=
 112                 test "z$lref" = "z$ref" || local_force='+'
 113                 echo "$ls_remote_result" |
 114                 sed -e '/\^{}$/d' |
 115                 (
 116                         IFS='   '
 117                         while read sha1 name
 118                         do
 119                                 # ignore the ones that do not start with $from
 120                                 mapped=${name#"$from"}
 121                                 test "z$name" = "z$mapped" && continue
 122                                 echo "${local_force}${name}:${to}${mapped}"
 123                         done
 124                 )
 125         done
 126 }
 127
 128 # Subroutine to canonicalize remote:local notation.
 129 canon_refs_list_for_fetch () {
 130         # If called from get_remote_default_refs_for_fetch
 131         # leave the branches in branch.${curr_branch}.merge alone,
 132         # or the first one otherwise; add prefix . to the rest
 133         # to prevent the secondary branches to be merged by default.
 134         merge_branches=
 135         curr_branch=
 136         if test "$1" = "-d"
 137         then
 138                 shift ; remote="$1" ; shift
 139                 set x $(expand_refs_wildcard "$@")
 140                 shift
 141                 if test "$remote" = "$(get_default_remote)"
 142                 then
 143                         curr_branch=$(git-symbolic-ref HEAD | \
 144                             sed -e 's|^refs/heads/||')
 145                         merge_branches=$(git-repo-config \
 146                             --get-all "branch.${curr_branch}.merge")
 147                 fi
 148                 # If we are fetching only one branch, then first branch
 149                 # is the only thing that makes sense to merge anyway,
 150                 # so there is no point refusing that traditional rule.
 151                 if test $# != 1 && test "z$merge_branches" = z
 152                 then
 153                         merge_branches=..this..would..never..match..
 154                 fi
 155         fi
 156         for ref
 157         do
 158                 force=
 159                 case "$ref" in
 160                 +*)
 161                         ref=$(expr "z$ref" : 'z+\(.*\)')
 162                         force=+
 163                         ;;
 164                 esac
 165                 expr "z$ref" : 'z.*:' >/dev/null || ref="${ref}:"
 166                 remote=$(expr "z$ref" : 'z\([^:]*\):')
 167                 local=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 168                 dot_prefix=.
 169                 if test -z "$merge_branches"
 170                 then
 171                         merge_branches=$remote
 172                         dot_prefix=
 173                 else
 174                         for merge_branch in $merge_branches
 175                         do
 176                             [ "$remote" = "$merge_branch" ] &&
 177                             dot_prefix= && break
 178                         done
 179                 fi
 180                 case "$remote" in
 181                 '') remote=HEAD ;;
 182                 refs/heads/* | refs/tags/* | refs/remotes/*) ;;
 183                 heads/* | tags/* | remotes/* ) remote="refs/$remote" ;;
 184                 *) remote="refs/heads/$remote" ;;
 185                 esac
 186                 case "$local" in
 187                 '') local= ;;
 188                 refs/heads/* | refs/tags/* | refs/remotes/*) ;;
 189                 heads/* | tags/* | remotes/* ) local="refs/$local" ;;
 190                 *) local="refs/heads/$local" ;;
 191                 esac
 192
 193                 if local_ref_name=$(expr "z$local" : 'zrefs/\(.*\)')
 194                 then
 195                    git-check-ref-format "$local_ref_name" ||
 196                    die "* refusing to create funny ref '$local_ref_name' locally"
 197                 fi
 198                 echo "${dot_prefix}${force}${remote}:${local}"
 199         done
 200 }
 201
 202 # Returns list of src: (no store), or src:dst (store)
 203 get_remote_default_refs_for_fetch () {
 204         data_source=$(get_data_source "$1")
 205         case "$data_source" in
 206         '' | config-partial | branches-partial)
 207                 echo "HEAD:" ;;
 208         config)
 209                 canon_refs_list_for_fetch -d "$1" \
 210                         $(git-repo-config --get-all "remote.$1.fetch") ;;
 211         branches)
 212                 remote_branch=$(sed -ne '/#/s/.*#//p' "$GIT_DIR/branches/$1")
 213                 case "$remote_branch" in '') remote_branch=master ;; esac
 214                 echo "refs/heads/${remote_branch}:refs/heads/$1"
 215                 ;;
 216         remotes)
 217                 canon_refs_list_for_fetch -d "$1" $(sed -ne '/^Pull: */{
 218                                                 s///p
 219                                         }' "$GIT_DIR/remotes/$1")
 220                 ;;
 221         *)
 222                 die "internal error: get-remote-default-ref-for-push $1" ;;
 223         esac
 224 }
 225
 226 get_remote_refs_for_push () {
 227         case "$#" in
 228         0) die "internal error: get-remote-refs-for-push." ;;
 229         1) get_remote_default_refs_for_push "$@" ;;
 230         *) shift; echo "$@" ;;
 231         esac
 232 }
 233
 234 get_remote_refs_for_fetch () {
 235         case "$#" in
 236         0)
 237             die "internal error: get-remote-refs-for-fetch." ;;
 238         1)
 239             get_remote_default_refs_for_fetch "$@" ;;
 240         *)
 241             shift
 242             tag_just_seen=
 243             for ref
 244             do
 245                 if test "$tag_just_seen"
 246                 then
 247                     echo "refs/tags/${ref}:refs/tags/${ref}"
 248                     tag_just_seen=
 249                     continue
 250                 else
 251                     case "$ref" in
 252                     tag)
 253                         tag_just_seen=yes
 254                         continue
 255                         ;;
 256                     esac
 257                 fi
 258                 canon_refs_list_for_fetch "$ref"
 259             done
 260             ;;
 261         esac
 262 }
 263
 264 resolve_alternates () {
 265         # original URL (xxx.git)
 266         top_=`expr "z$1" : 'z\([^:]*:/*[^/]*\)/'`
 267         while read path
 268         do
 269                 case "$path" in
 270                 \#* | '')
 271                         continue ;;
 272                 /*)
 273                         echo "$top_$path/" ;;
 274                 ../*)
 275                         # relative -- ugly but seems to work.
 276                         echo "$1/objects/$path/" ;;
 277                 *)
 278                         # exit code may not be caught by the reader.
 279                         echo "bad alternate: $path"
 280                         exit 1 ;;
 281                 esac
 282         done
 283 }