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 "$deps" ]; then
  34         head="$(git symbolic-ref HEAD)"
  35         bname="${head#refs/top-bases/}"
  36         if [ "$bname" != "$head" -a -s "$git_dir/top-deps" -a -s "$git_dir/top-merge" ]; then
  37                 # We are on a base branch now; resume merge!
  38                 deps="$(cat "$git_dir/top-deps")"
  39                 merge="$(cat "$git_dir/top-merge")"
  40                 name="$bname"
  41                 restarted=1
  42                 info "Resuming $name setup..."
  43         else
  44                 # The common case
  45                 [ -z "$name" ] && die "no branch name given"
  46                 deps="${head#refs/heads/}"
  47                 [ "$deps" != "$head" ] || die "refusing to auto-depend on non-head ref ($head)"
  48                 info "Automatically marking dependency on $deps"
  49         fi
  50 fi
  51
  52 [ -n "$merge" -o -n "$restarted" ] || merge="$deps "
  53
  54 for d in $deps; do
  55         git rev-parse --verify "$d" >/dev/null 2>&1 ||
  56                 die "unknown branch dependency '$d'"
  57 done
  58 ! git rev-parse --verify "$name" >/dev/null 2>&1 ||
  59         die "branch '$name' already exists"
  60
  61 # Clean up any stale stuff
  62 rm -f "$git_dir/top-deps" "$git_dir/top-merge"
  63
  64
  65 ## Create base
  66
  67 if [ -n "$merge" ]; then
  68         # Unshift the first item from the to-merge list
  69         branch="${merge%% *}"
  70         merge="${merge#* }"
  71         info "Creating $name base from $branch..."
  72         switch_to_base "$name" "$branch"
  73 fi
  74
  75
  76 ## Merge other dependencies into the base
  77
  78 while [ -n "$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 \`git reset --hard\`"
  87                 info "but please remember you are on the base branch now;"
  88                 info "you will want to switch to a different branch."
  89                 echo "$deps" >"$git_dir/top-deps"
  90                 echo "$merge" >"$git_dir/top-merge"
  91                 exit 2
  92         fi
  93 done
  94
  95
  96 ## Set up the topic branch
  97
  98 git checkout -b "$name"
  99
 100 echo "$deps" | sed 's/ /\n/g' >"$root_dir/.topdeps"
 101 git add "$root_dir/.topdeps"
 102
 103 author="$(git var GIT_AUTHOR_IDENT)"
 104 author_addr="${author%> *}>"
 105 {
 106         echo "From: $author_addr"
 107         ! header="$(git config topgit.to)" || echo "To: $header"
 108         ! header="$(git config topgit.cc)" || echo "Cc: $header"
 109         ! header="$(git config topgit.bcc)" || echo "Bcc: $header"
 110         ! subject_prefix="$(git config topgit.subjectprefix)" || subject_prefix="$subject_prefix "
 111         echo "Subject: [${subject_prefix}PATCH] $name"
 112         echo
 113         cat <<EOT
 114 <patch description>
 115
 116 Signed-off-by: $author_addr
 117 EOT
 118 } >"$root_dir/.topmsg"
 119 git add "$root_dir/.topmsg"
 120
 121
 122
 123 info "Topic branch $name set up. Please fill .topmsg now and make initial commit."
 124 info "To abort: git rm -f .top* && git checkout ${deps%% *} && tg delete $name"