debian/git.preinst

   1 #!/bin/sh
   2 set -e
   3
   4 # /var/cache/git/ -> /var/lib/git/ transition
   5 if test "$1" = upgrade &&
   6    dpkg --compare-versions "$2" lt-nl '1:1.8.4~rc0-1'; then
   7         mkdir -m 755 -p /var/lib/git
   8         (
   9                 cd /var/lib/git
  10                 for target in ../../cache/git/*; do
  11                         if ! test -L "$target" && ! test -e "$target"; then
  12                                 continue
  13                         fi
  14
  15                         link=${target#../../cache/git/}
  16                         if ! test -L "$link" && ! test -e "$link"; then
  17                                 ln -s "$target" "$link"
  18                         fi
  19                 done
  20         )
  21 fi
  22
  23 # A previous version of the /var/lib/git/ transition code
  24 # left behind a symlink '/var/lib/git/*' -> '../../cache/git/*'.
  25 if test "$1" = upgrade &&
  26    dpkg --compare-versions "$2" eq '1:1.8.4~rc0-1' &&
  27    test -L '/var/lib/git/*'; then
  28         target=$(readlink '/var/lib/git/*')
  29         if test "$target" = '../../cache/git/*'; then
  30                 rm -f '/var/lib/git/*'
  31         fi
  32 fi
  33
  34 # Snippet based on dpkg-maintscript-helper from dpkg 1.15.8.
  35 # Postinst explains why.
  36 rm_conffile () {
  37         CONFFILE=$1; shift
  38         test "$1" = install || test "$1" = upgrade || return 0
  39         dpkg --compare-versions "$2" lt-nl "$3" || return 0
  40         test -e "$CONFFILE" || return 0
  41
  42         md5sum=$(md5sum $CONFFILE | sed -e 's/ .*//')
  43         old_md5sum=$(
  44                 dpkg-query -W -f='${Conffiles}' git |
  45                 sed -n -e "\' $CONFFILE ' { s/ obsolete\$//; s/.* //; p }"
  46         )
  47         if test "$md5sum" != "$old_md5sum"; then
  48                 echo "$CONFFILE has been modified by you."
  49                 echo "Saving as $CONFFILE.dpkg-bak ..."
  50                 mv -f "$CONFFILE" "$CONFFILE.dpkg-backup"
  51         else
  52                 echo "Moving $CONFFILE out of the way..."
  53                 mv -f "$CONFFILE" "$CONFFILE.dpkg-remove"
  54         fi
  55 }
  56
  57 rm_conffile /etc/bash_completion.d/git "$1" "$2" '1:1.8.0-1~'
  58
  59 # Now /etc/emacs/site-start.d/50git-core.el belongs to the
  60 # git-el package.  If we are upgrading from a pre- 1.7.4.1-2~
  61 # version then git-el is at most unpacked (so its version
  62 # is 50git-core.el.dpkg-new if present), and we can remove
  63 # an unchanged 50git-core.el file without danger.
  64 #
  65 rm_conffile /etc/emacs/site-start.d/50git-core.el "$1" "$2" '1:1.7.4.1-2~'
  66
  67 # Git versions before 1.7.7-2 kept about 100 hard links to
  68 # /usr/lib/git-core/git at /usr/lib/git-core/git-* to avoid
  69 # wasting time resolving a symlink when old scripts call "git
  70 # foo" as git-foo.  Btrfs doesn't like to have more than 130 or
  71 # so links to a single inode in a given directory.  dpkg versions
  72 # 1.16.1 and later temporarily double the number of hard links to
  73 # an inode when upgrading a package.
  74 #
  75 # Replace the hard links with symlinks _before_ upgrading to
  76 # avoid trouble.
  77 #
  78 # For added fun, coreutils mv will not replace a file by a
  79 # symlink to the same inode (bug #654666).  We give
  80 # /usr/lib/git-core/git its own inode to work around that.
  81
  82 if test "$1" = upgrade &&
  83    dpkg --compare-versions "$2" lt-nl '1:1.7.7-2'; then
  84         refinode=$(stat -c%i /usr/lib/git-core/git-add)
  85
  86         rm -f /usr/lib/git-core/git.tmp
  87         cp -p /usr/lib/git-core/git /usr/lib/git-core/git.tmp
  88         mv -f /usr/lib/git-core/git.tmp /usr/lib/git-core/git
  89         for f in /usr/lib/git-core/*; do
  90                 test "$f" != /usr/lib/git-core/git &&
  91                 test "$f" != /usr/lib/git-core/git-add || continue
  92                 rm -f "$f.tmp"
  93                 inode=$(stat -c%i "$f")
  94                 test "$inode" = "$refinode" || continue
  95                 ln -s git "$f.tmp"
  96                 mv -f "$f.tmp" "$f"
  97         done
  98 fi