Fails to patch a broken symlink when using --backup and multiple filesystems

[Loïc Minier]

Binary package hint: patch

Hi

When patching a symlink to a non-existent directory and using --backup, patch renames some files from TMPDIR (/tmp by default) into the current directory. This fails if it's not on the same filesystem.

Here's a test case:
mkdir test; cd test
ln -sf foo/foo bar
patch -p0 --backup <<EOF
diff bar bar
--- /dev/null
+++ bar
@@ -0,0 +1 @@
+coin
EOF

This fails with:
patching file bar
patch: **** Can't create file bar : No such file or directory

/!\ This only fails if your current directory is in a different filesystem than /tmp.

This works around the bug: mkdir ./tmp; TMPDIR=./tmp

Cheers,