contrib/devtools/git-subtree-check.sh

   1 #!/bin/sh
   2 # Copyright (c) 2015 The Bitcoin Core developers
   3 # Distributed under the MIT software license, see the accompanying
   4 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 DIR="$1"
   7 COMMIT="$2"
   8 if [ -z "$COMMIT" ]; then
   9     COMMIT=HEAD
  10 fi
  11
  12 # Taken from git-subtree (Copyright (C) 2009 Avery Pennarun <apenwarr@gmail.com>)
  13 find_latest_squash()
  14 {
  15         dir="$1"
  16         sq=
  17         main=
  18         sub=
  19         git log --grep="^git-subtree-dir: $dir/*\$" \
  20                 --pretty=format:'START %H%n%s%n%n%b%nEND%n' "$COMMIT" |
  21         while read a b _; do
  22                 case "$a" in
  23                         START) sq="$b" ;;
  24                         git-subtree-mainline:) main="$b" ;;
  25                         git-subtree-split:) sub="$b" ;;
  26                         END)
  27                                 if [ -n "$sub" ]; then
  28                                         if [ -n "$main" ]; then
  29                                                 # a rejoin commit?
  30                                                 # Pretend its sub was a squash.
  31                                                 sq="$sub"
  32                                         fi
  33                                         echo "$sq" "$sub"
  34                                         break
  35                                 fi
  36                                 sq=
  37                                 main=
  38                                 sub=
  39                                 ;;
  40                 esac
  41         done
  42 }
  43
  44 # find latest subtree update
  45 latest_squash="$(find_latest_squash "$DIR")"
  46 if [ -z "$latest_squash" ]; then
  47     echo "ERROR: $DIR is not a subtree" >&2
  48     exit 2
  49 fi
  50 set $latest_squash
  51 old=$1
  52 rev=$2
  53
  54 # get the tree in the current commit
  55 tree_actual=$(git ls-tree -d "$COMMIT" "$DIR" | head -n 1)
  56 if [ -z "$tree_actual" ]; then
  57     echo "FAIL: subtree directory $DIR not found in $COMMIT" >&2
  58     exit 1
  59 fi
  60 set $tree_actual
  61 tree_actual_type=$2
  62 tree_actual_tree=$3
  63 echo "$DIR in $COMMIT currently refers to $tree_actual_type $tree_actual_tree"
  64 if [ "d$tree_actual_type" != "dtree" ]; then
  65     echo "FAIL: subtree directory $DIR is not a tree in $COMMIT" >&2
  66     exit 1
  67 fi
  68
  69 # get the tree at the time of the last subtree update
  70 tree_commit=$(git show -s --format="%T" $old)
  71 echo "$DIR in $COMMIT was last updated in commit $old (tree $tree_commit)"
  72
  73 # ... and compare the actual tree with it
  74 if [ "$tree_actual_tree" != "$tree_commit" ]; then
  75     git diff $tree_commit $tree_actual_tree >&2
  76     echo "FAIL: subtree directory was touched without subtree merge" >&2
  77     exit 1
  78 fi
  79
  80 # get the tree in the subtree commit referred to
  81 if [ "d$(git cat-file -t $rev 2>/dev/null)" != dcommit ]; then
  82     echo "subtree commit $rev unavailable: cannot compare" >&2
  83     exit
  84 fi
  85 tree_subtree=$(git show -s --format="%T" $rev)
  86 echo "$DIR in $COMMIT was last updated to upstream commit $rev (tree $tree_subtree)"
  87
  88 # ... and compare the actual tree with it
  89 if [ "$tree_actual_tree" != "$tree_subtree" ]; then
  90     echo "FAIL: subtree update commit differs from upstream tree!" >&2
  91     exit 1
  92 fi
  93
  94 echo "GOOD"