edit_line and edit_xml attributes can now override immutable bit

The edit_line and edit_xml attributes of the files promise can now
override the immutable bit.

Ticket: ENT-10961, CFE-1840
Changelog: Commit
Signed-off-by: Lars Erik Wik <lars.erik.wik@northern.tech>

Author: larsewi

cf-agent/files_edit.c

@@ -127,7 +127,7 @@ void FinishEditContext(EvalContext *ctx, EditContext *ec, const Attributes *a, c
                 RecordNoChange(ctx, pp, a, "No edit changes to file '%s' need saving",
                                ec->filename);
             }
-            else if (SaveItemListAsFile(ec->file_start, ec->changes_filename, a, ec->new_line_mode))
+            else if (SaveItemListAsFile(ctx, ec->file_start, ec->changes_filename, a, ec->new_line_mode))
             {
                 RecordChange(ctx, pp, a, "Edited file '%s'", ec->filename);
                 *result = PromiseResultUpdate(*result, PROMISE_RESULT_CHANGE);
@@ -150,7 +150,7 @@ void FinishEditContext(EvalContext *ctx, EditContext *ec, const Attributes *a, c
                                    ec->filename);
                 }
             }
-            else if (SaveXmlDocAsFile(ec->xmldoc, ec->changes_filename, a, ec->new_line_mode))
+            else if (SaveXmlDocAsFile(ctx, ec->xmldoc, ec->changes_filename, a, ec->new_line_mode))
             {
                 RecordChange(ctx, pp, a, "Edited xml file '%s'", ec->filename);
                 *result = PromiseResultUpdate(*result, PROMISE_RESULT_CHANGE);
@@ -253,8 +253,8 @@ static bool SaveXmlCallback(const char *dest_filename, void *param,
 
 /*********************************************************************/
 
-bool SaveXmlDocAsFile(xmlDocPtr doc, const char *file, const Attributes *a, NewLineMode new_line_mode)
+bool SaveXmlDocAsFile(EvalContext *ctx, xmlDocPtr doc, const char *file, const Attributes *a, NewLineMode new_line_mode)
 {
-    return SaveAsFile(&SaveXmlCallback, doc, file, a, new_line_mode);
+    return SaveAsFile(ctx, &SaveXmlCallback, doc, file, a, new_line_mode);
 }
 #endif /* HAVE_LIBXML2 */

cf-agent/files_edit.h

@@ -61,7 +61,7 @@ void FinishEditContext(EvalContext *ctx, EditContext *ec,
 
 #ifdef HAVE_LIBXML2
 bool LoadFileAsXmlDoc(xmlDocPtr *doc, const char *file, EditDefaults ed, bool only_checks);
-bool SaveXmlDocAsFile(xmlDocPtr doc, const char *file,
+bool SaveXmlDocAsFile(EvalContext *ctx, xmlDocPtr doc, const char *file,
                       const Attributes *a, NewLineMode new_line_mode);
 #endif
 

cf-agent/verify_files.c

@@ -986,7 +986,7 @@ static PromiseResult RenderTemplateMustache(EvalContext *ctx,
                                   edcontext->filename, message);
                     result = PromiseResultUpdate(result, PROMISE_RESULT_FAIL);
                 }
-                else if (SaveAsFile(SaveBufferCallback, output_buffer,
+                else if (SaveAsFile(ctx, SaveBufferCallback, output_buffer,
                                     edcontext->changes_filename, attr,
                                     edcontext->new_line_mode))
                 {

libpromises/files_operators.c

@@ -47,6 +47,7 @@
 #include <files_repository.h>
 #include <files_lib.h>
 #include <buffer.h>
+#include <override_fsattrs.h>
 
 
 bool MoveObstruction(EvalContext *ctx, char *from, const Attributes *attr, const Promise *pp, PromiseResult *result)
@@ -149,7 +150,7 @@ bool MoveObstruction(EvalContext *ctx, char *from, const Attributes *attr, const
 
 /*********************************************************************/
 
-bool SaveAsFile(SaveCallbackFn callback, void *param, const char *file, const Attributes *a, NewLineMode new_line_mode)
+bool SaveAsFile(EvalContext *ctx, SaveCallbackFn callback, void *param, const char *file, const Attributes *a, NewLineMode new_line_mode)
 {
     assert(a != NULL);
     struct stat statbuf;
@@ -277,7 +278,8 @@ bool SaveAsFile(SaveCallbackFn callback, void *param, const char *file, const At
         unlink(backup);
     }
 
-    if (rename(new, BufferData(deref_file)) == -1)
+    const bool override_immutable = EvalContextOverrideImmutableGet(ctx);
+    if (!OverrideImmutableRename(new, BufferData(deref_file), override_immutable))
     {
         Log(LOG_LEVEL_ERR, "Can't rename '%s' to %s - so promised edits could not be moved into place. (rename: %s)",
             new, BufferData(pretty_file), GetErrorStr());
@@ -331,10 +333,10 @@ static bool SaveItemListCallback(const char *dest_filename, void *param, NewLine
 
 /*********************************************************************/
 
-bool SaveItemListAsFile(Item *liststart, const char *file, const Attributes *a, NewLineMode new_line_mode)
+bool SaveItemListAsFile(EvalContext *ctx, Item *liststart, const char *file, const Attributes *a, NewLineMode new_line_mode)
 {
     assert(a != NULL);
-    return SaveAsFile(&SaveItemListCallback, liststart, file, a, new_line_mode);
+    return SaveAsFile(ctx, &SaveItemListCallback, liststart, file, a, new_line_mode);
 }
 
 // Some complex logic here to enable warnings of diffs to be given

libpromises/files_operators.h

@@ -31,8 +31,8 @@
 bool MoveObstruction(EvalContext *ctx, char *from, const Attributes *attr, const Promise *pp, PromiseResult *result);
 
 typedef bool (*SaveCallbackFn)(const char *dest_filename, void *param, NewLineMode new_line_mode);
-bool SaveAsFile(SaveCallbackFn callback, void *param, const char *file, const Attributes *a, NewLineMode new_line_mode);
-bool SaveItemListAsFile(Item *liststart, const char *file, const Attributes *a, NewLineMode new_line_mode);
+bool SaveAsFile(EvalContext *ctx, SaveCallbackFn callback, void *param, const char *file, const Attributes *a, NewLineMode new_line_mode);
+bool SaveItemListAsFile(EvalContext *ctx, Item *liststart, const char *file, const Attributes *a, NewLineMode new_line_mode);
 
 bool CompareToFile(EvalContext *ctx, const Item *liststart, const char *file, const Attributes *a, const Promise *pp, PromiseResult *result);