git-submodule.sh

   1 #!/bin/sh
   2 #
   3 # git-submodules.sh: add, init, update or list git submodules
   4 #
   5 # Copyright (c) 2007 Lars Hjemli
   6
   7 USAGE='[--quiet] [--cached] [add <repo> [-b branch]|status|init|update] [--] [<path>...]'
   8 . git-sh-setup
   9 require_work_tree
  10
  11 add=
  12 branch=
  13 init=
  14 update=
  15 status=
  16 quiet=
  17 cached=
  18
  19 #
  20 # print stuff on stdout unless -q was specified
  21 #
  22 say()
  23 {
  24         if test -z "$quiet"
  25         then
  26                 echo "$@"
  27         fi
  28 }
  29
  30 # NEEDSWORK: identical function exists in get_repo_base in clone.sh
  31 get_repo_base() {
  32         (
  33                 cd "`/bin/pwd`" &&
  34                 cd "$1" || cd "$1.git" &&
  35                 {
  36                         cd .git
  37                         pwd
  38                 }
  39         ) 2>/dev/null
  40 }
  41
  42 # Resolve relative url by appending to parent's url
  43 resolve_relative_url ()
  44 {
  45         branch="$(git symbolic-ref HEAD 2>/dev/null)"
  46         remote="$(git config branch.${branch#refs/heads/}.remote)"
  47         remote="${remote:-origin}"
  48         remoteurl="$(git config remote.$remote.url)" ||
  49                 die "remote ($remote) does not have a url in .git/config"
  50         url="$1"
  51         while test -n "$url"
  52         do
  53                 case "$url" in
  54                 ../*)
  55                         url="${url#../}"
  56                         remoteurl="${remoteurl%/*}"
  57                         ;;
  58                 ./*)
  59                         url="${url#./}"
  60                         ;;
  61                 *)
  62                         break;;
  63                 esac
  64         done
  65         echo "$remoteurl/$url"
  66 }
  67
  68 #
  69 # Map submodule path to submodule name
  70 #
  71 # $1 = path
  72 #
  73 module_name()
  74 {
  75         # Do we have "submodule.<something>.path = $1" defined in .gitmodules file?
  76         re=$(printf '%s' "$1" | sed -e 's/\([^a-zA-Z0-9_]\)/\\\1/g')
  77         name=$( GIT_CONFIG=.gitmodules \
  78                 git config --get-regexp '^submodule\..*\.path$' |
  79                 sed -n -e 's|^submodule\.\(.*\)\.path '"$re"'$|\1|p' )
  80        test -z "$name" &&
  81        die "No submodule mapping found in .gitmodules for path '$path'"
  82        echo "$name"
  83 }
  84
  85 #
  86 # Clone a submodule
  87 #
  88 # Prior to calling, modules_update checks that a possibly existing
  89 # path is not a git repository.
  90 # Likewise, module_add checks that path does not exist at all,
  91 # since it is the location of a new submodule.
  92 #
  93 module_clone()
  94 {
  95         path=$1
  96         url=$2
  97
  98         # If there already is a directory at the submodule path,
  99         # expect it to be empty (since that is the default checkout
 100         # action) and try to remove it.
 101         # Note: if $path is a symlink to a directory the test will
 102         # succeed but the rmdir will fail. We might want to fix this.
 103         if test -d "$path"
 104         then
 105                 rmdir "$path" 2>/dev/null ||
 106                 die "Directory '$path' exist, but is neither empty nor a git repository"
 107         fi
 108
 109         test -e "$path" &&
 110         die "A file already exist at path '$path'"
 111
 112         git-clone -n "$url" "$path" ||
 113         die "Clone of '$url' into submodule path '$path' failed"
 114 }
 115
 116 #
 117 # Add a new submodule to the working tree, .gitmodules and the index
 118 #
 119 # $@ = repo [path]
 120 #
 121 # optional branch is stored in global branch variable
 122 #
 123 module_add()
 124 {
 125         repo=$1
 126         path=$2
 127
 128         if test -z "$repo"; then
 129                 usage
 130         fi
 131
 132         case "$repo" in
 133         ./*|../*)
 134                 # dereference source url relative to parent's url
 135                 realrepo="$(resolve_relative_url $repo)" ;;
 136         *)
 137                 # Turn the source into an absolute path if
 138                 # it is local
 139                 if base=$(get_repo_base "$repo"); then
 140                         repo="$base"
 141                 fi
 142                 realrepo=$repo
 143                 ;;
 144         esac
 145
 146         # Guess path from repo if not specified or strip trailing slashes
 147         if test -z "$path"; then
 148                 path=$(echo "$repo" | sed -e 's|/*$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
 149         else
 150                 path=$(echo "$path" | sed -e 's|/*$||')
 151         fi
 152
 153         test -e "$path" &&
 154         die "'$path' already exists"
 155
 156         git ls-files --error-unmatch "$path" > /dev/null 2>&1 &&
 157         die "'$path' already exists in the index"
 158
 159         module_clone "$path" "$realrepo" || exit
 160         (unset GIT_DIR && cd "$path" && git checkout -q ${branch:+-b "$branch" "origin/$branch"}) ||
 161         die "Unable to checkout submodule '$path'"
 162         git add "$path" ||
 163         die "Failed to add submodule '$path'"
 164
 165         GIT_CONFIG=.gitmodules git config submodule."$path".path "$path" &&
 166         GIT_CONFIG=.gitmodules git config submodule."$path".url "$repo" &&
 167         git add .gitmodules ||
 168         die "Failed to register submodule '$path'"
 169 }
 170
 171 #
 172 # Register submodules in .git/config
 173 #
 174 # $@ = requested paths (default to all)
 175 #
 176 modules_init()
 177 {
 178         git ls-files --stage -- "$@" | grep -e '^160000 ' |
 179         while read mode sha1 stage path
 180         do
 181                 # Skip already registered paths
 182                 name=$(module_name "$path") || exit
 183                 url=$(git config submodule."$name".url)
 184                 test -z "$url" || continue
 185
 186                 url=$(GIT_CONFIG=.gitmodules git config submodule."$name".url)
 187                 test -z "$url" &&
 188                 die "No url found for submodule path '$path' in .gitmodules"
 189
 190                 # Possibly a url relative to parent
 191                 case "$url" in
 192                 ./*|../*)
 193                         url="$(resolve_relative_url "$url")"
 194                         ;;
 195                 esac
 196
 197                 git config submodule."$name".url "$url" ||
 198                 die "Failed to register url for submodule path '$path'"
 199
 200                 say "Submodule '$name' ($url) registered for path '$path'"
 201         done
 202 }
 203
 204 #
 205 # Update each submodule path to correct revision, using clone and checkout as needed
 206 #
 207 # $@ = requested paths (default to all)
 208 #
 209 modules_update()
 210 {
 211         git ls-files --stage -- "$@" | grep -e '^160000 ' |
 212         while read mode sha1 stage path
 213         do
 214                 name=$(module_name "$path") || exit
 215                 url=$(git config submodule."$name".url)
 216                 if test -z "$url"
 217                 then
 218                         # Only mention uninitialized submodules when its
 219                         # path have been specified
 220                         test "$#" != "0" &&
 221                         say "Submodule path '$path' not initialized"
 222                         continue
 223                 fi
 224
 225                 if ! test -d "$path"/.git
 226                 then
 227                         module_clone "$path" "$url" || exit
 228                         subsha1=
 229                 else
 230                         subsha1=$(unset GIT_DIR && cd "$path" &&
 231                                 git rev-parse --verify HEAD) ||
 232                         die "Unable to find current revision in submodule path '$path'"
 233                 fi
 234
 235                 if test "$subsha1" != "$sha1"
 236                 then
 237                         (unset GIT_DIR && cd "$path" && git-fetch &&
 238                                 git-checkout -q "$sha1") ||
 239                         die "Unable to checkout '$sha1' in submodule path '$path'"
 240
 241                         say "Submodule path '$path': checked out '$sha1'"
 242                 fi
 243         done
 244 }
 245
 246 set_name_rev () {
 247         revname=$( (
 248                 unset GIT_DIR &&
 249                 cd "$1" && {
 250                         git describe "$2" 2>/dev/null ||
 251                         git describe --tags "$2" 2>/dev/null ||
 252                         git describe --contains --tags "$2"
 253                 }
 254         ) )
 255         test -z "$revname" || revname=" ($revname)"
 256 }
 257
 258 #
 259 # List all submodules, prefixed with:
 260 #  - submodule not initialized
 261 #  + different revision checked out
 262 #
 263 # If --cached was specified the revision in the index will be printed
 264 # instead of the currently checked out revision.
 265 #
 266 # $@ = requested paths (default to all)
 267 #
 268 modules_list()
 269 {
 270         git ls-files --stage -- "$@" | grep -e '^160000 ' |
 271         while read mode sha1 stage path
 272         do
 273                 name=$(module_name "$path") || exit
 274                 url=$(git config submodule."$name".url)
 275                 if test -z "url" || ! test -d "$path"/.git
 276                 then
 277                         say "-$sha1 $path"
 278                         continue;
 279                 fi
 280                 set_name_rev "$path" "$sha1"
 281                 if git diff-files --quiet -- "$path"
 282                 then
 283                         say " $sha1 $path$revname"
 284                 else
 285                         if test -z "$cached"
 286                         then
 287                                 sha1=$(unset GIT_DIR && cd "$path" && git rev-parse --verify HEAD)
 288                                 set_name_rev "$path" "$sha1"
 289                         fi
 290                         say "+$sha1 $path$revname"
 291                 fi
 292         done
 293 }
 294
 295 while test $# != 0
 296 do
 297         case "$1" in
 298         add)
 299                 add=1
 300                 ;;
 301         init)
 302                 init=1
 303                 ;;
 304         update)
 305                 update=1
 306                 ;;
 307         status)
 308                 status=1
 309                 ;;
 310         -q|--quiet)
 311                 quiet=1
 312                 ;;
 313         -b|--branch)
 314                 case "$2" in
 315                 '')
 316                         usage
 317                         ;;
 318                 esac
 319                 branch="$2"; shift
 320                 ;;
 321         --cached)
 322                 cached=1
 323                 ;;
 324         --)
 325                 break
 326                 ;;
 327         -*)
 328                 usage
 329                 ;;
 330         *)
 331                 break
 332                 ;;
 333         esac
 334         shift
 335 done
 336
 337 case "$add,$branch" in
 338 1,*)
 339         ;;
 340 ,)
 341         ;;
 342 ,*)
 343         usage
 344         ;;
 345 esac
 346
 347 case "$add,$init,$update,$status,$cached" in
 348 1,,,,)
 349         module_add "$@"
 350         ;;
 351 ,1,,,)
 352         modules_init "$@"
 353         ;;
 354 ,,1,,)
 355         modules_update "$@"
 356         ;;
 357 ,,,*,*)
 358         modules_list "$@"
 359         ;;
 360 *)
 361         usage
 362         ;;
 363 esac