From f2d7881cf56b2d1448b9e09c46c076a14a05011d Mon Sep 17 00:00:00 2001

From: Jan Synacek <jsynacek@redhat.com>

Date: Tue, 11 Apr 2017 11:20:36 +0200

Subject: [PATCH] tmpfiles: add new 'e' action which cleans up a dir without

 creating it

I wanted to add a config line that would empty a directory

without creating it if doesn't exist. Existing actions don't allow

this.

v2: properly add 'e' to needs_glob() and takes_ownership()

(cherry picked from commit df8dee85da5fa41e95dd7f536e67fcc6940a6488)

Resolves: #1225739

---

 man/tmpfiles.d.xml      |  9 +++++++-

 src/tmpfiles/tmpfiles.c | 51 ++++++++++++-----------------------------

 2 files changed, 23 insertions(+), 37 deletions(-)

diff --git a/man/tmpfiles.d.xml b/man/tmpfiles.d.xml

index fc1fe13aca..fc9db622e5 100644

--- a/man/tmpfiles.d.xml

+++ b/man/tmpfiles.d.xml

@@ -161,6 +161,13 @@

           <listitem><para>Create or empty a directory.</para></listitem>

         </varlistentry>

+        <varlistentry>

+          <term><varname>e</varname></term>

+          <listitem><para>Clean directory contents based on the age argument.

+          Lines of this type accept shell-style globs in

+          place of normal path names.</para></listitem>

+        </varlistentry>

+

         <varlistentry>

           <term><varname>v</varname></term>

           <listitem><para>Create a subvolume if the path does not

@@ -467,7 +474,7 @@

       <para>The age field only applies to lines

       starting with <varname>d</varname>,

-      <varname>D</varname>, and

+      <varname>D</varname>, <varname>e</varname> and

       <varname>x</varname>. If omitted or set to

       <literal>-</literal>, no automatic clean-up is

       done.</para>

diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c

index bda89df5be..df7676b572 100644

--- a/src/tmpfiles/tmpfiles.c

+++ b/src/tmpfiles/tmpfiles.c

@@ -79,6 +79,7 @@ typedef enum ItemType {

         /* These ones take globs */

         WRITE_FILE = 'w',

+        EMPTY_DIRECTORY = 'e',

         SET_XATTR = 't',

         RECURSIVE_SET_XATTR = 'T',

         SET_ACL = 'a',

@@ -150,6 +151,7 @@ static bool needs_glob(ItemType t) {

                       IGNORE_PATH,

                       IGNORE_DIRECTORY_PATH,

                       REMOVE_PATH,

+                      EMPTY_DIRECTORY,

                       RECURSIVE_REMOVE_PATH,

                       ADJUST_MODE,

                       RELABEL_PATH,

@@ -165,6 +167,7 @@ static bool takes_ownership(ItemType t) {

                       CREATE_FILE,

                       TRUNCATE_FILE,

                       CREATE_DIRECTORY,

+                      EMPTY_DIRECTORY,

                       TRUNCATE_DIRECTORY,

                       CREATE_SUBVOLUME,

                       CREATE_FIFO,

@@ -1059,6 +1062,9 @@ static int create_item(Item *i) {

                 log_debug("%s directory \"%s\".", creation_mode_verb_to_string(creation), i->path);

+                /* fall through */

+

+        case EMPTY_DIRECTORY:

                 r = path_set_perms(i, i->path);

                 if (r < 0)

                         return r;

@@ -1285,43 +1291,19 @@ static int remove_item_instance(Item *i, const char *instance) {

 }

 static int remove_item(Item *i) {

-        int r = 0;

-

         assert(i);

         log_debug("Running remove action for entry %c %s", (char) i->type, i->path);

         switch (i->type) {

-

-        case CREATE_FILE:

-        case TRUNCATE_FILE:

-        case CREATE_DIRECTORY:

-        case CREATE_SUBVOLUME:

-        case CREATE_FIFO:

-        case CREATE_SYMLINK:

-        case CREATE_CHAR_DEVICE:

-        case CREATE_BLOCK_DEVICE:

-        case IGNORE_PATH:

-        case IGNORE_DIRECTORY_PATH:

-        case ADJUST_MODE:

-        case RELABEL_PATH:

-        case RECURSIVE_RELABEL_PATH:

-        case WRITE_FILE:

-        case COPY_FILES:

-        case SET_XATTR:

-        case RECURSIVE_SET_XATTR:

-        case SET_ACL:

-        case RECURSIVE_SET_ACL:

-                break;

-

         case REMOVE_PATH:

         case TRUNCATE_DIRECTORY:

         case RECURSIVE_REMOVE_PATH:

-                r = glob_item(i, remove_item_instance, false);

-                break;

-        }

+                return glob_item(i, remove_item_instance, false);

-        return r;

+        default:

+                return 0;

+        }

 }

 static int clean_item_instance(Item *i, const char* instance) {

@@ -1377,8 +1359,6 @@ static int clean_item_instance(Item *i, const char* instance) {

 }

 static int clean_item(Item *i) {

-        int r = 0;

-

         assert(i);

         log_debug("Running clean action for entry %c %s", (char) i->type, i->path);

@@ -1386,19 +1366,17 @@ static int clean_item(Item *i) {

         switch (i->type) {

         case CREATE_DIRECTORY:

         case CREATE_SUBVOLUME:

+        case EMPTY_DIRECTORY:

         case TRUNCATE_DIRECTORY:

         case IGNORE_PATH:

         case COPY_FILES:

                 clean_item_instance(i, i->path);

-                break;

+                return 0;

         case IGNORE_DIRECTORY_PATH:

-                r = glob_item(i, clean_item_instance, false);

-                break;

+                return glob_item(i, clean_item_instance, false);

         default:

-                break;

+                return 0;

         }

-

-        return r;

 }

 static int process_item_array(ItemArray *array);

@@ -1642,6 +1620,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {

         case TRUNCATE_FILE:

         case CREATE_DIRECTORY:

         case CREATE_SUBVOLUME:

+        case EMPTY_DIRECTORY:

         case TRUNCATE_DIRECTORY:

         case CREATE_FIFO:

         case IGNORE_PATH: