preinst is in git 1:1.7.9.5-1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
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set -e
# Snippet based on dpkg-maintscript-helper from dpkg 1.15.8.
# Postinst explains why.
rm_conffile () {
CONFFILE=$1; shift
test "$1" = install || test "$1" = upgrade || return 0
dpkg --compare-versions "$2" lt-nl '1:1.7.4.1-2~' || return 0
test -e "$CONFFILE" || return 0
md5sum=$(md5sum $CONFFILE | sed -e 's/ .*//')
old_md5sum=$(
dpkg-query -W -f='${Conffiles}' git |
sed -n -e "\' $CONFFILE ' { s/ obsolete\$//; s/.* //; p }"
)
if test "$md5sum" != "$old_md5sum"; then
echo "$CONFFILE has been modified by you."
echo "Saving as $CONFFILE.dpkg-bak ..."
mv -f "$CONFFILE" "$CONFFILE.dpkg-backup"
else
echo "Moving $CONFFILE out of the way..."
mv -f "$CONFFILE" "$CONFFILE.dpkg-remove"
fi
}
# Now /etc/emacs/site-start.d/50git-core.el belongs to the
# git-el package. If we are upgrading from a pre- 1.7.4.1-2~
# version then git-el is at most unpacked (so its version
# is 50git-core.el.dpkg-new if present), and we can remove
# an unchanged 50git-core.el file without danger.
#
rm_conffile /etc/emacs/site-start.d/50git-core.el "$1" "$2"
# Git versions before 1.7.7-2 kept about 100 hard links to
# /usr/lib/git-core/git at /usr/lib/git-core/git-* to avoid
# wasting time resolving a symlink when old scripts call "git
# foo" as git-foo. Btrfs doesn't like to have more than 130 or
# so links to a single inode in a given directory. dpkg versions
# 1.16.1 and later temporarily double the number of hard links to
# an inode when upgrading a package.
#
# Replace the hard links with symlinks _before_ upgrading to
# avoid trouble.
#
# For added fun, coreutils mv will not replace a file by a
# symlink to the same inode (bug #654666). We give
# /usr/lib/git-core/git its own inode to work around that.
if test "$1" = upgrade &&
dpkg --compare-versions "$2" lt-nl '1:1.7.7-2'; then
refinode=$(stat -c%i /usr/lib/git-core/git-add)
rm -f /usr/lib/git-core/git.tmp
cp -p /usr/lib/git-core/git /usr/lib/git-core/git.tmp
mv -f /usr/lib/git-core/git.tmp /usr/lib/git-core/git
for f in /usr/lib/git-core/*; do
test "$f" != /usr/lib/git-core/git &&
test "$f" != /usr/lib/git-core/git-add || continue
rm -f "$f.tmp"
inode=$(stat -c%i "$f")
test "$inode" = "$refinode" || continue
ln -s git "$f.tmp"
mv -f "$f.tmp" "$f"
done
fi
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