From eabd84bce1139a5c48089c97cd74bb919a8df331 Mon Sep 17 00:00:00 2001
From: Albert Puig <albert.puig@cern.ch>
Date: Fri, 25 May 2018 22:04:04 +0200
Subject: Add ignore-missing option to link

---
 README.md                           |  1 +
 dotbot/plugins/link.py              | 18 ++++++++++++------
 test/tests/link-ignore-missing.bash | 23 +++++++++++++++++++++++
 3 files changed, 36 insertions(+), 6 deletions(-)
 create mode 100644 test/tests/link-ignore-missing.bash

diff --git a/README.md b/README.md
index cff7a3b..00094aa 100644
--- a/README.md
+++ b/README.md
@@ -178,6 +178,7 @@ Available extended configuration parameters:
 | `relative` | Use a relative path to the source when creating the symlink (default:false, absolute links) |
 | `glob` | Treat a `*` character as a wildcard, and perform link operations on all of those matches (default:false) |
 | `if` | Execute this in your `$SHELL` and only link if it is successful. |
+| `ignore-missing` | Do not fail if the source is missing and create the link anyway (default:false) |
 
 #### Example
 
diff --git a/dotbot/plugins/link.py b/dotbot/plugins/link.py
index 0b47ac6..bf3db3e 100644
--- a/dotbot/plugins/link.py
+++ b/dotbot/plugins/link.py
@@ -31,6 +31,7 @@ class Link(dotbot.Plugin):
             create = defaults.get('create', False)
             use_glob = defaults.get('glob', False)
             test = defaults.get('if', None)
+            ignore_missing = defaults.get('ignore-missing', False)
             if isinstance(source, dict):
                 # extended config
                 test = source.get('if', test)
@@ -39,6 +40,7 @@ class Link(dotbot.Plugin):
                 relink = source.get('relink', relink)
                 create = source.get('create', create)
                 use_glob = source.get('glob', use_glob)
+                ignore_missing = source.get('ignore-missing', ignore_missing)
                 path = self._default_source(destination, source.get('path'))
             else:
                 path = self._default_source(destination, source)
@@ -67,7 +69,7 @@ class Link(dotbot.Plugin):
                         success &= self._create(destination)
                     if force or relink:
                         success &= self._delete(path, destination, relative, force)
-                    success &= self._link(path, destination, relative)
+                    success &= self._link(path, destination, relative, ignore_missing)
                 else:
                     self._log.lowinfo("Globs from '" + path + "': " + str(glob_results))
                     glob_base = path[:glob_star_loc]
@@ -78,18 +80,22 @@ class Link(dotbot.Plugin):
                             success &= self._create(glob_link_destination)
                         if force or relink:
                             success &= self._delete(glob_full_item, glob_link_destination, relative, force)
-                        success &= self._link(glob_full_item, glob_link_destination, relative)
+                        success &= self._link(glob_full_item, glob_link_destination, relative, ignore_missing)
             else:
                 if create:
                     success &= self._create(destination)
-                if not self._exists(os.path.join(self._context.base_directory(), path)):
+                if not ignore_missing and not self._exists(os.path.join(self._context.base_directory(), path)):
+                    # we seemingly check this twice (here and in _link) because
+                    # if the file doesn't exist and force is True, we don't
+                    # want to remove the original (this is tested by
+                    # link-force-leaves-when-nonexistent.bash)
                     success = False
                     self._log.warning('Nonexistent source %s -> %s' %
                         (destination, path))
                     continue
                 if force or relink:
                     success &= self._delete(path, destination, relative, force)
-                success &= self._link(path, destination, relative)
+                success &= self._link(path, destination, relative, ignore_missing)
         if success:
             self._log.info('All links have been set up')
         else:
@@ -189,7 +195,7 @@ class Link(dotbot.Plugin):
         destination_dir = os.path.dirname(destination)
         return os.path.relpath(source, destination_dir)
 
-    def _link(self, source, link_name, relative):
+    def _link(self, source, link_name, relative, ignore_missing):
         '''
         Links link_name to source.
 
@@ -209,7 +215,7 @@ class Link(dotbot.Plugin):
         # we need to use absolute_source below because our cwd is the dotfiles
         # directory, and if source is relative, it will be relative to the
         # destination directory
-        elif not self._exists(link_name) and self._exists(absolute_source):
+        elif not self._exists(link_name) and (ignore_missing or self._exists(absolute_source)):
             try:
                 os.symlink(source, destination)
             except OSError:
diff --git a/test/tests/link-ignore-missing.bash b/test/tests/link-ignore-missing.bash
new file mode 100644
index 0000000..4978279
--- /dev/null
+++ b/test/tests/link-ignore-missing.bash
@@ -0,0 +1,23 @@
+test_description='link is created even if source is missing'
+. '../test-lib.bash'
+
+test_expect_failure 'run' '
+run_dotbot <<EOF
+- link:
+    ~/missing_link:
+        path: missing
+EOF
+'
+
+test_expect_success 'run 2' '
+run_dotbot <<EOF
+- link:
+    ~/missing_link:
+        path: missing
+        ignore-missing: true
+EOF
+'
+
+test_expect_success 'test' '
+test -L ~/missing_link
+'
-- 
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