git diffs: Support symlinks

* src/patch.c (main): Support git symlink diffs.
* tests/symlinks: Add git symlink diff test cases.

1 files changed, 103 insertions, 1 deletions

diff --git a/tests/symlinks b/tests/symlinks
index 3472791..6665028 100644
--- a/tests/symlinks
+++ b/tests/symlinks
@@ -73,4 +73,106 @@ File l is not a regular file -- can't patch
 Status: 1
 EOF
 
-# FIXME: Add tests for backup / reject file clashes with symlinks
+# --------------------------------------------------------------
+
+cat > create-symlink.diff <<EOF
+diff --git a/symlink b/symlink
+new file mode 120000
+index 0000000..12a8d8a
+--- /dev/null
++++ b/symlink
+@@ -0,0 +1 @@
++target1
+\ No newline at end of file
+EOF
+
+check 'patch -p1 < create-symlink.diff || echo "Status: $?"' <<EOF
+patching symbolic link symlink
+EOF
+
+check 'echo a > target1 && cat symlink' <<EOF
+a
+EOF
+check 'echo b > target1 && cat symlink' <<EOF
+b
+EOF
+rm -f target1
+
+cat > modify-symlink.diff <<EOF
+diff --git a/symlink b/symlink
+index 12a8d8a..3b7781e 120000
+--- a/symlink
++++ b/symlink
+@@ -1 +1 @@
+-target1
+\ No newline at end of file
++target2
+\ No newline at end of file
+EOF
+
+check 'patch -p1 < modify-symlink.diff || echo "Status: $?"' <<EOF
+patching symbolic link symlink
+EOF
+
+check 'echo a > target2 && cat symlink' <<EOF
+a
+EOF
+check 'echo b > target2 && cat symlink' <<EOF
+b
+EOF
+rm -f target2
+
+cat > delete-symlink.diff <<EOF
+diff --git a/symlink b/symlink
+deleted file mode 120000
+index 3b7781e..0000000
+--- a/symlink
++++ /dev/null
+@@ -1 +0,0 @@
+-target2
+\ No newline at end of file
+EOF
+
+check 'patch -p1 < delete-symlink.diff || echo "Status: $?"' <<EOF
+patching symbolic link symlink
+EOF
+
+ncheck 'test ! -e symlink'
+
+# --------------------------------------------------------------
+
+# The backup file of a new symlink is an empty regular file.
+
+check 'patch -p1 --backup < create-symlink.diff || echo "Status: $?"' <<EOF
+patching symbolic link symlink
+EOF
+
+ncheck 'test ! \( -L symlink.orig -o -s symlink.orig \)'
+
+# The backup file of a modified symlink is the old symlink.
+
+check 'patch -p1 --backup < modify-symlink.diff || echo "Status: $?"' <<EOF
+patching symbolic link symlink
+EOF
+
+check 'echo a > symlink.orig && cat target1' <<EOF
+a
+EOF
+check 'echo b > symlink.orig && cat target1' <<EOF
+b
+EOF
+rm -f target1
+
+# The backup file of a deleted symlink is the old symlink.
+
+check 'patch -p1 --backup < delete-symlink.diff || echo "Status: $?"' <<EOF
+patching symbolic link symlink
+EOF
+
+check 'echo a > symlink.orig && cat target2' <<EOF
+a
+EOF
+check 'echo b > symlink.orig && cat target2' <<EOF
+b
+EOF
+rm -f target2