debian/git.preinst

   1 #!/bin/sh
   2 set -e
   3
   4 #DEBHELPER#
   5
   6 # /var/cache/git/ -> /var/lib/git/ transition
   7 if test "$1" = upgrade &&
   8    dpkg --compare-versions "$2" lt-nl '1:1.8.4~rc0-1'; then
   9         mkdir -m 755 -p /var/lib/git
  10         (
  11                 cd /var/lib/git
  12                 for target in ../../cache/git/*; do
  13                         if ! test -L "$target" && ! test -e "$target"; then
  14                                 continue
  15                         fi
  16
  17                         link=${target#../../cache/git/}
  18                         if ! test -L "$link" && ! test -e "$link"; then
  19                                 ln -s "$target" "$link"
  20                         fi
  21                 done
  22         )
  23 fi
  24
  25 # A previous version of the /var/lib/git/ transition code
  26 # left behind a symlink '/var/lib/git/*' -> '../../cache/git/*'.
  27 if test "$1" = upgrade &&
  28    dpkg --compare-versions "$2" eq '1:1.8.4~rc0-1' &&
  29    test -L '/var/lib/git/*'; then
  30         target=$(readlink '/var/lib/git/*')
  31         if test "$target" = '../../cache/git/*'; then
  32                 rm -f '/var/lib/git/*'
  33         fi
  34 fi
  35
  36 # Git versions before 1.7.7-2 kept about 100 hard links to
  37 # /usr/lib/git-core/git at /usr/lib/git-core/git-* to avoid
  38 # wasting time resolving a symlink when old scripts call "git
  39 # foo" as git-foo.  Btrfs doesn't like to have more than 130 or
  40 # so links to a single inode in a given directory.  dpkg versions
  41 # 1.16.1 and later temporarily double the number of hard links to
  42 # an inode when upgrading a package.
  43 #
  44 # Replace the hard links with symlinks _before_ upgrading to
  45 # avoid trouble.
  46 #
  47 # For added fun, coreutils mv will not replace a file by a
  48 # symlink to the same inode (bug #654666).  We give
  49 # /usr/lib/git-core/git its own inode to work around that.
  50
  51 if test "$1" = upgrade &&
  52    dpkg --compare-versions "$2" lt-nl '1:1.7.7-2'; then
  53         refinode=$(stat -c%i /usr/lib/git-core/git-add)
  54
  55         rm -f /usr/lib/git-core/git.tmp
  56         cp -p /usr/lib/git-core/git /usr/lib/git-core/git.tmp
  57         mv -f /usr/lib/git-core/git.tmp /usr/lib/git-core/git
  58         for f in /usr/lib/git-core/*; do
  59                 test "$f" != /usr/lib/git-core/git &&
  60                 test "$f" != /usr/lib/git-core/git-add || continue
  61                 rm -f "$f.tmp"
  62                 inode=$(stat -c%i "$f")
  63                 test "$inode" = "$refinode" || continue
  64                 ln -s git "$f.tmp"
  65                 mv -f "$f.tmp" "$f"
  66         done
  67 fi