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add link_cow feature

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When enabled if a regular file is opened which has a link count > 1 it will
copy the file to a temporary file and rename over the original. Effectively
breaking the link. This behavior is similar to cow-shell and other LD_PRELOAD
based "CoW" solutions.
This commit is contained in:
Antonio SJ Musumeci 2018-10-02 14:22:37 -04:00
parent 19a7d43b31
commit 93f7d7d927
18 changed files with 424 additions and 127 deletions
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2
src/getxattr.cpp
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@ -210,6 +210,8 @@ _getxattr_controlfile(const Config &config,
_getxattr_controlfile_bool(config.ignorepponrename,attrvalue);
else if(attr[2] == "security_capability")
_getxattr_controlfile_bool(config.security_capability,attrvalue);
else if(attr[2] == "link_cow")
_getxattr_controlfile_bool(config.link_cow,attrvalue);
else if(attr[2] == "policies")
_getxattr_controlfile_policies(config,attrvalue);
else if(attr[2] == "version")