1 files changed, 67 insertions, 0 deletions
diff --git a/debian/git.preinst b/debian/git.preinst
new file mode 100644
index 0000000..6b8090c
--- /dev/null
+++ b/debian/git.preinst
@@ -0,0 +1,67 @@
+#!/bin/sh
+set -e
+
+#DEBHELPER#
+
+# /var/cache/git/ -> /var/lib/git/ transition
+if test "$1" = upgrade &&
+   dpkg --compare-versions "$2" lt-nl '1:1.8.4~rc0-1'; then
+	mkdir -m 755 -p /var/lib/git
+	(
+		cd /var/lib/git
+		for target in ../../cache/git/*; do
+			if ! test -L "$target" && ! test -e "$target"; then
+				continue
+			fi
+
+			link=${target#../../cache/git/}
+			if ! test -L "$link" && ! test -e "$link"; then
+				ln -s "$target" "$link"
+			fi
+		done
+	)
+fi
+
+# A previous version of the /var/lib/git/ transition code
+# left behind a symlink '/var/lib/git/*' -> '../../cache/git/*'.
+if test "$1" = upgrade &&
+   dpkg --compare-versions "$2" eq '1:1.8.4~rc0-1' &&
+   test -L '/var/lib/git/*'; then
+	target=$(readlink '/var/lib/git/*')
+	if test "$target" = '../../cache/git/*'; then
+		rm -f '/var/lib/git/*'
+	fi
+fi
+
+# 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