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         found_mergeref=
 136         curr_branch=
 137         if test "$1" = "-d"
 138         then
 139                 shift ; remote="$1" ; shift
 140                 if test "$remote" = "$(get_default_remote)"
 141                 then
 142                         curr_branch=$(git-symbolic-ref HEAD | \
 143                             sed -e 's|^refs/heads/||')
 144                         merge_branches=$(git-repo-config \
 145                             --get-all "branch.${curr_branch}.merge") ||
 146                         merge_branches=.this.would.never.match.any.ref.
 147                 fi
 148                 set x $(expand_refs_wildcard "$@")
 149                 shift
 150         fi
 151         for ref
 152         do
 153                 force=
 154                 case "$ref" in
 155                 +*)
 156                         ref=$(expr "z$ref" : 'z+\(.*\)')
 157                         force=+
 158                         ;;
 159                 esac
 160                 expr "z$ref" : 'z.*:' >/dev/null || ref="${ref}:"
 161                 remote=$(expr "z$ref" : 'z\([^:]*\):')
 162                 local=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 163                 dot_prefix=.
 164                 if test -z "$merge_branches"
 165                 then
 166                         merge_branches=$remote
 167                         dot_prefix=
 168                 else
 169                         for merge_branch in $merge_branches
 170                         do
 171                             [ "$remote" = "$merge_branch" ] &&
 172                             dot_prefix= && break
 173                         done
 174                 fi
 175                 if test -z $dot_prefix
 176                 then
 177                         found_mergeref=true
 178                 fi
 179                 case "$remote" in
 180                 '') remote=HEAD ;;
 181                 refs/heads/* | refs/tags/* | refs/remotes/*) ;;
 182                 heads/* | tags/* | remotes/* ) remote="refs/$remote" ;;
 183                 *) remote="refs/heads/$remote" ;;
 184                 esac
 185                 case "$local" in
 186                 '') local= ;;
 187                 refs/heads/* | refs/tags/* | refs/remotes/*) ;;
 188                 heads/* | tags/* | remotes/* ) local="refs/$local" ;;
 189                 *) local="refs/heads/$local" ;;
 190                 esac
 191
 192                 if local_ref_name=$(expr "z$local" : 'zrefs/\(.*\)')
 193                 then
 194                    git-check-ref-format "$local_ref_name" ||
 195                    die "* refusing to create funny ref '$local_ref_name' locally"
 196                 fi
 197                 echo "${dot_prefix}${force}${remote}:${local}"
 198         done
 199         if test -z "$found_mergeref" -a "$curr_branch"
 200         then
 201                 echo >&2 "Warning: No merge candidate found because value of config option
 202          \"branch.${curr_branch}.merge\" does not match any remote branch fetched."
 203         fi
 204 }
 205
 206 # Returns list of src: (no store), or src:dst (store)
 207 get_remote_default_refs_for_fetch () {
 208         data_source=$(get_data_source "$1")
 209         case "$data_source" in
 210         '' | config-partial | branches-partial)
 211                 echo "HEAD:" ;;
 212         config)
 213                 canon_refs_list_for_fetch -d "$1" \
 214                         $(git-repo-config --get-all "remote.$1.fetch") ;;
 215         branches)
 216                 remote_branch=$(sed -ne '/#/s/.*#//p' "$GIT_DIR/branches/$1")
 217                 case "$remote_branch" in '') remote_branch=master ;; esac
 218                 echo "refs/heads/${remote_branch}:refs/heads/$1"
 219                 ;;
 220         remotes)
 221                 canon_refs_list_for_fetch -d "$1" $(sed -ne '/^Pull: */{
 222                                                 s///p
 223                                         }' "$GIT_DIR/remotes/$1")
 224                 ;;
 225         *)
 226                 die "internal error: get-remote-default-ref-for-push $1" ;;
 227         esac
 228 }
 229
 230 get_remote_refs_for_push () {
 231         case "$#" in
 232         0) die "internal error: get-remote-refs-for-push." ;;
 233         1) get_remote_default_refs_for_push "$@" ;;
 234         *) shift; echo "$@" ;;
 235         esac
 236 }
 237
 238 get_remote_refs_for_fetch () {
 239         case "$#" in
 240         0)
 241             die "internal error: get-remote-refs-for-fetch." ;;
 242         1)
 243             get_remote_default_refs_for_fetch "$@" ;;
 244         *)
 245             shift
 246             tag_just_seen=
 247             for ref
 248             do
 249                 if test "$tag_just_seen"
 250                 then
 251                     echo "refs/tags/${ref}:refs/tags/${ref}"
 252                     tag_just_seen=
 253                     continue
 254                 else
 255                     case "$ref" in
 256                     tag)
 257                         tag_just_seen=yes
 258                         continue
 259                         ;;
 260                     esac
 261                 fi
 262                 canon_refs_list_for_fetch "$ref"
 263             done
 264             ;;
 265         esac
 266 }
 267
 268 resolve_alternates () {
 269         # original URL (xxx.git)
 270         top_=`expr "z$1" : 'z\([^:]*:/*[^/]*\)/'`
 271         while read path
 272         do
 273                 case "$path" in
 274                 \#* | '')
 275                         continue ;;
 276                 /*)
 277                         echo "$top_$path/" ;;
 278                 ../*)
 279                         # relative -- ugly but seems to work.
 280                         echo "$1/objects/$path/" ;;
 281                 *)
 282                         # exit code may not be caught by the reader.
 283                         echo "bad alternate: $path"
 284                         exit 1 ;;
 285                 esac
 286         done
 287 }