Use prerequisite tags to skip tests that depend on symbolic links

Many tests depend on that symbolic links work.  This introduces a check
that sets the prerequisite tag SYMLINKS if the file system supports
symbolic links.  Since so many tests have to check for this prerequisite,
we do the check in test-lib.sh, so that we don't need to repeat the test
in many scripts.

To check for 'ln -s' failures, you can use a FAT partition on Linux:

$ mkdosfs -C git-on-fat 1000000
$ sudo mount -o loop,uid=j6t,gid=users,shortname=winnt git-on-fat /mnt

Clone git to /mnt and

$ GIT_SKIP_TESTS='t0001.1[34] t0010 t1301 t403[34] t4129.[47] t5701.7
          t7701.3 t9100 t9101.26 t9119 t9124.[67] t9200.10 t9600.6' \
        make test

(These additionally skipped tests depend on POSIX permissions that FAT on
Linux does not provide.)

Signed-off-by: Johannes Sixt <j6t@kdbg.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/t/t2001-checkout-cache-clash.sh b/t/t2001-checkout-cache-clash.sh
index ef007532b1..98aa73e823 100755
--- a/t/t2001-checkout-cache-clash.sh
+++ b/t/t2001-checkout-cache-clash.sh
@@ -59,10 +59,10 @@ test_expect_success \
     'git read-tree -m $tree1 && git checkout-index -f -a'
 test_debug 'show_files $tree1'
 
-ln -s path0 path1
-test_expect_success \
+test_expect_success SYMLINKS \
     'git update-index --add a symlink.' \
-    'git update-index --add path1'
+    'ln -s path0 path1 &&
+     git update-index --add path1'
 test_expect_success \
     'writing tree out with git write-tree' \
     'tree3=$(git write-tree)'