tg-export.sh

   1 #!/bin/sh
   2 # TopGit - A different patch queue manager
   3 # (c) Petr Baudis <pasky@suse.cz>  2008
   4 # GPLv2
   5
   6 name=
   7 branches=
   8 output=
   9 driver=collapse
  10 flatten=false
  11 numbered=false
  12
  13
  14 ## Parse options
  15
  16 while [ -n "$1" ]; do
  17         arg="$1"; shift
  18         case "$arg" in
  19         -b)
  20                 branches="$1"; shift;;
  21         --flatten)
  22                 flatten=true;;
  23         --numbered)
  24                 flatten=true;
  25                 numbered=true;;
  26         --quilt)
  27                 driver=quilt;;
  28         --collapse)
  29                 driver=collapse;;
  30         --linearize)
  31                 driver=linearize;;
  32         -*)
  33                 echo "Usage: tg [...] export ([--collapse] NEWBRANCH | [-b BRANCH1,BRANCH2...] --quilt DIRECTORY | --linearize NEWBRANCH)" >&2
  34                 exit 1;;
  35         *)
  36                 [ -z "$output" ] || die "output already specified ($output)"
  37                 output="$arg";;
  38         esac
  39 done
  40
  41
  42
  43 [ -z "$branches" -o "$driver" = "quilt" ] ||
  44         die "-b works only with the quilt driver"
  45
  46 [ "$driver" = "quilt" ] || ! "$numbered" ||
  47         die "--numbered works only with the quilt driver";
  48
  49 [ "$driver" = "quilt" ] || ! "$flatten" ||
  50         die "--flatten works only with the quilt driver"
  51
  52 if [ -z "$branches" ]; then
  53         # this check is only needed when no branches have been passed
  54         name="$(git symbolic-ref HEAD | sed 's#^refs/heads/##')"
  55         base_rev="$(git rev-parse --short --verify "refs/top-bases/$name" 2>/dev/null)" ||
  56                 die "not on a TopGit-controlled branch"
  57 fi
  58
  59
  60 playground="$(mktemp -d -t tg-export.XXXXXX)"
  61 trap 'rm -rf "$playground"' EXIT
  62
  63
  64 ## Collapse driver
  65
  66 # pretty_tree NAME
  67 # Output tree ID of a cleaned-up tree without tg's artifacts.
  68 pretty_tree()
  69 {
  70         git ls-tree --full-tree "$1" \
  71         | awk -F '      ' '$2 !~ /^.top/' \
  72         | git mktree
  73 }
  74
  75 create_tg_commit()
  76 {
  77         name="$1"
  78         tree="$2"
  79         parent="$3"
  80
  81         # Get commit message and authorship information
  82         git cat-file blob "$name:.topmsg" | git mailinfo "$playground/^msg" /dev/null > "$playground/^info"
  83
  84         GIT_AUTHOR_NAME="$(sed -n '/^Author/ s/Author: //p' "$playground/^info")"
  85         GIT_AUTHOR_EMAIL="$(sed -n '/^Email/ s/Email: //p' "$playground/^info")"
  86         GIT_AUTHOR_DATE="$(sed -n '/^Date/ s/Date: //p' "$playground/^info")"
  87         SUBJECT="$(sed -n '/^Subject/ s/Subject: //p' "$playground/^info")"
  88
  89         test -n "$GIT_AUTHOR_NAME" && export GIT_AUTHOR_NAME
  90         test -n "$GIT_AUTHOR_EMAIL" && export GIT_AUTHOR_EMAIL
  91         test -n "$GIT_AUTHOR_DATE" && export GIT_AUTHOR_DATE
  92
  93         (printf '%s\n\n' "$SUBJECT"; cat "$playground/^msg") |
  94         git stripspace |
  95         git commit-tree "$tree" -p "$parent"
  96 }
  97
  98 # collapsed_commit NAME
  99 # Produce a collapsed commit of branch NAME.
 100 collapsed_commit()
 101 {
 102         name="$1"
 103
 104         rm -f "$playground/^pre" "$playground/^post"
 105         >"$playground/^body"
 106
 107         # Determine parent
 108         parent="$(cut -f 1 "$playground/$name^parents")"
 109         if [ "$(cat "$playground/$name^parents" | wc -l)" -gt 1 ]; then
 110                 # Produce a merge commit first
 111                 parent="$({
 112                         echo "TopGit-driven merge of branches:"
 113                         echo
 114                         cut -f 2 "$playground/$name^parents"
 115                 } | git commit-tree "$(pretty_tree "refs/top-bases/$name")" \
 116                         $(for p in $parent; do echo -p $p; done))"
 117         fi
 118
 119         if branch_empty "$name"; then
 120                 echo "$parent";
 121         else
 122                 create_tg_commit "$name" "$(pretty_tree $name)" "$parent"
 123         fi;
 124
 125         echo "$name" >>"$playground/^ticker"
 126 }
 127
 128 # collapse
 129 # This will collapse a single branch, using information about
 130 # previously collapsed branches stored in $playground.
 131 collapse()
 132 {
 133         if [ -s "$playground/$_dep" ]; then
 134                 # We've already seen this dep
 135                 commit="$(cat "$playground/$_dep")"
 136
 137         elif [ -z "$_dep_is_tgish" ]; then
 138                 # This dep is not for rewrite
 139                 commit="$(git rev-parse --verify "$_dep")"
 140
 141         else
 142                 # First time hitting this dep; the common case
 143                 echo "Collapsing $_dep"
 144                 commit="$(collapsed_commit "$_dep")"
 145                 mkdir -p "$playground/$(dirname "$_dep")"
 146                 echo "$commit" >"$playground/$_dep"
 147         fi
 148
 149         # Propagate our work through the dependency chain
 150         mkdir -p "$playground/$(dirname "$_name")"
 151         echo "$commit   $_dep" >>"$playground/$_name^parents"
 152 }
 153
 154
 155 ## Quilt driver
 156
 157 quilt()
 158 {
 159         if [ -z "$_dep_is_tgish" ]; then
 160                 # This dep is not for rewrite
 161                 return
 162         fi
 163
 164         if "$flatten"; then
 165                 bn="$(echo "$_dep.diff" | sed -e 's#_#__#g' -e 's#/#_#g')";
 166                 dn="";
 167         else
 168                 bn="$(basename "$_dep.diff")";
 169                 dn="$(dirname "$_dep.diff")/";
 170                 if [ "x$dn" = "x./" ]; then
 171                         dn="";
 172                 fi;
 173         fi;
 174
 175         if [ -e "$playground/$_dep" ]; then
 176                 # We've already seen this dep
 177                 return
 178         fi
 179
 180         mkdir -p "$playground/$(dirname "$_dep")";
 181         touch "$playground/$_dep";
 182
 183         if branch_empty "$_dep"; then
 184                 echo "Skip empty patch $_dep";
 185         else
 186                 if "$numbered"; then
 187                         number="$(echo $(($(cat "$playground/^number" 2>/dev/null) + 1)))";
 188                         bn="$(printf "%04u-$bn" $number)";
 189                         echo "$number" >"$playground/^number";
 190                 fi;
 191
 192                 echo "Exporting $_dep"
 193                 mkdir -p "$output/$dn";
 194                 $tg patch "$_dep" >"$output/$dn$bn"
 195                 echo "$dn$bn -p1" >>"$output/series"
 196         fi
 197 }
 198
 199 linearize()
 200 {
 201         if test ! -f "$playground/^BASE"; then
 202                 head="$(git rev-parse --verify "$_dep")"
 203                 echo "$head" > "$playground/^BASE"
 204                 git checkout -q "$head"
 205                 return;
 206         fi;
 207
 208         head=$(git rev-parse --verify HEAD)
 209
 210         if [ -z "$_dep_is_tgish" ]; then
 211                 # merge in $_dep unless already included
 212                 rev="$(git rev-parse --verify "$_dep")";
 213                 common="$(git merge-base --all HEAD "$_dep")";
 214                 if test "$rev" = "$common"; then
 215                         # already included, just skip
 216                         :;
 217                 else
 218                         retmerge=0;
 219
 220                         git merge -s recursive "$_dep" || retmerge="$?";
 221                         if test "x$retmerge" != "x0"; then
 222                                 echo fix up the merge, commit and then exit;
 223                                 #todo error handling
 224                                 sh -i </dev/tty;
 225                         fi;
 226                 fi;
 227         else
 228                 retmerge=0;
 229
 230                 git merge-recursive "$(pretty_tree "refs/top-bases/$_dep")" -- HEAD "$(pretty_tree "refs/heads/$_dep")" || retmerge="$?";
 231
 232                 if test "x$retmerge" != "x0"; then
 233                         git rerere;
 234                         echo "fix up the merge and update the index.  Don't commit!"
 235                         #todo error handling
 236                         sh -i </dev/tty;
 237                 fi
 238
 239                 result_tree=$(git write-tree)
 240                 # testing branch_empty might not always give the right answer.
 241                 # It can happen that the patch is non-empty but still after
 242                 # linearizing there is no change.  So compare the trees.
 243                 if test "x$result_tree" = "x$(git rev-parse $head^{tree})"; then
 244                         echo "skip empty commit $_dep";
 245                 else
 246                         newcommit=$(create_tg_commit "$_dep" "$result_tree" HEAD)
 247                         git update-ref HEAD $newcommit $head
 248                         echo "exported commit $_dep";
 249                 fi
 250         fi
 251 }
 252
 253 ## Machinery
 254
 255 if [ "$driver" = "collapse" ] || [ "$driver" = "linearize" ]; then
 256         [ -n "$output" ] ||
 257                 die "no target branch specified"
 258         ! ref_exists "$output"  ||
 259                 die "target branch '$output' already exists; first run: git branch -D $output"
 260
 261 elif [ "$driver" = "quilt" ]; then
 262         [ -n "$output" ] ||
 263                 die "no target directory specified"
 264         [ ! -e "$output" ] ||
 265                 die "target directory already exists: $output"
 266
 267         mkdir -p "$output"
 268 fi
 269
 270
 271 driver()
 272 {
 273         case $_dep in refs/remotes/*) return;; esac
 274         branch_needs_update >/dev/null
 275         [ "$_ret" -eq 0 ] ||
 276                 die "cancelling export of $_dep (-> $_name): branch not up-to-date"
 277
 278         $driver
 279 }
 280
 281 # Call driver on all the branches - this will happen
 282 # in topological order.
 283 if [ -z "$branches" ]; then
 284         recurse_deps driver "$name"
 285         (_ret=0; _dep="$name"; _name=""; _dep_is_tgish=1; driver)
 286 else
 287         echo "$branches" | tr ',' '\n' | while read _dep; do
 288                 _dep_is_tgish=1
 289                 $driver
 290         done
 291         name="$(echo "$branches" | sed 's/.*,//')"
 292 fi
 293
 294
 295 if [ "$driver" = "collapse" ]; then
 296         git update-ref "refs/heads/$output" "$(cat "$playground/$name")" ""
 297
 298         depcount="$(cat "$playground/^ticker" | wc -l)"
 299         echo "Exported topic branch $name (total $depcount topics) to branch $output"
 300
 301 elif [ "$driver" = "quilt" ]; then
 302         depcount="$(cat "$output/series" | wc -l)"
 303         echo "Exported topic branch $name (total $depcount topics) to directory $output"
 304
 305 elif [ "$driver" = "linearize" ]; then
 306         git checkout -q -b $output
 307
 308         echo $name
 309         if test $(git rev-parse "$(pretty_tree $name)^{tree}") != $(git rev-parse "HEAD^{tree}"); then
 310                 echo "Warning: Exported result doesn't match";
 311                 echo "tg-head=$(git rev-parse "$name"), exported=$(git rev-parse "HEAD")";
 312                 #git diff $head HEAD;
 313         fi;
 314
 315 fi
 316
 317 # vim:noet