tg-create.sh

   1 #!/bin/sh
   2 # TopGit - A different patch queue manager
   3 # (c) Petr Baudis <pasky@suse.cz>  2008
   4 # GPLv2
   5
   6 deps= # List of dependent branches
   7 restarted= # Set to 1 if we are picking up in the middle of base setup
   8 merge= # List of branches to be merged; subset of $deps
   9 name=
  10
  11
  12 ## Parse options
  13
  14 while [ -n "$1" ]; do
  15         arg="$1"; shift
  16         case "$arg" in
  17         -*)
  18                 echo "Usage: tg create NAME [DEPS...]" >&2
  19                 exit 1;;
  20         *)
  21                 if [ -z "$name" ]; then
  22                         name="$arg"
  23                 else
  24                         deps="$deps $arg"
  25                 fi;;
  26         esac
  27 done
  28
  29
  30 ## Auto-guess dependencies
  31
  32 deps="${deps# }"
  33 if [ -z "$deps" ]; then
  34         if [ -z "$name" -a -s "$git_dir/top-name" -a -s "$git_dir/top-deps" -a -s "$git_dir/top-merge" ]; then
  35                 # We are setting up the base branch now; resume merge!
  36                 name="$(cat "$git_dir/top-name")"
  37                 deps="$(cat "$git_dir/top-deps")"
  38                 merge="$(cat "$git_dir/top-merge")"
  39                 restarted=1
  40                 info "Resuming $name setup..."
  41         else
  42                 # The common case
  43                 [ -z "$name" ] && die "no branch name given"
  44                 head="$(git symbolic-ref HEAD)"
  45                 deps="${head#refs/heads/}"
  46                 [ "$deps" != "$head" ] || die "refusing to auto-depend on non-head ref ($head)"
  47                 info "Automatically marking dependency on $deps"
  48         fi
  49 fi
  50
  51 [ -n "$merge" -o -n "$restarted" ] || merge="$deps "
  52
  53 for d in $deps; do
  54         ref_exists "$d"  ||
  55                 die "unknown branch dependency '$d'"
  56 done
  57 ! ref_exists "$name"  ||
  58         die "branch '$name' already exists"
  59
  60 # Clean up any stale stuff
  61 rm -f "$git_dir/top-name" "$git_dir/top-deps" "$git_dir/top-merge"
  62
  63
  64 ## Create base
  65
  66 if [ -n "$merge" ]; then
  67         # Unshift the first item from the to-merge list
  68         branch="${merge%% *}"
  69         merge="${merge#* }"
  70         info "Creating $name base from $branch..."
  71         # We create a detached head so that we can abort this operation
  72         git checkout -q "$(git rev-parse "$branch")"
  73 fi
  74
  75
  76 ## Merge other dependencies into the base
  77
  78 while [ -n "$merge" ]; do
  79         # Unshift the first item from the to-merge list
  80         branch="${merge%% *}"
  81         merge="${merge#* }"
  82         info "Merging $name base with $branch..."
  83
  84         if ! git merge "$branch"; then
  85                 info "Please commit merge resolution and call: tg create"
  86                 info "It is also safe to abort this operation using:"
  87                 info "git reset --hard some_branch"
  88                 info "(You are on a detached HEAD now.)"
  89                 echo "$name" >"$git_dir/top-name"
  90                 echo "$deps" >"$git_dir/top-deps"
  91                 echo "$merge" >"$git_dir/top-merge"
  92                 exit 2
  93         fi
  94 done
  95
  96
  97 ## Set up the topic branch
  98
  99 git update-ref "refs/top-bases/$name" "HEAD" ""
 100 git checkout -b "$name"
 101
 102 echo "$deps" | sed 's/ /\n/g' >"$root_dir/.topdeps"
 103 git add -f "$root_dir/.topdeps"
 104
 105 author="$(git var GIT_AUTHOR_IDENT)"
 106 author_addr="${author%> *}>"
 107 {
 108         echo "From: $author_addr"
 109         ! header="$(git config topgit.to)" || echo "To: $header"
 110         ! header="$(git config topgit.cc)" || echo "Cc: $header"
 111         ! header="$(git config topgit.bcc)" || echo "Bcc: $header"
 112         ! subject_prefix="$(git config topgit.subjectprefix)" || subject_prefix="$subject_prefix "
 113         echo "Subject: [${subject_prefix}PATCH] $name"
 114         echo
 115         cat <<EOT
 116 <patch description>
 117
 118 Signed-off-by: $author_addr
 119 EOT
 120 } >"$root_dir/.topmsg"
 121 git add -f "$root_dir/.topmsg"
 122
 123
 124
 125 info "Topic branch $name set up. Please fill .topmsg now and make initial commit."
 126 info "To abort: git rm -f .top* && git checkout ${deps%% *} && tg delete $name"