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78 lines
1.8 KiB
78 lines
1.8 KiB
/*
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ISC License
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Copyright (c) 2018, Antonio SJ Musumeci <trapexit@spawn.link>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "fs_cow.hpp"
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#include "errno.hpp"
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#include "fs_lstat.hpp"
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#include "fs_copyfile.hpp"
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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bool
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fs::cow::is_eligible(const int flags_)
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{
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int accmode;
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accmode = (flags_ & O_ACCMODE);
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return ((accmode == O_RDWR) ||
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(accmode == O_WRONLY));
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}
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bool
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fs::cow::is_eligible(const struct stat &st_)
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{
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return ((S_ISREG(st_.st_mode)) && (st_.st_nlink > 1));
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}
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bool
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fs::cow::is_eligible(const int flags_,
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const struct stat &st_)
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{
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return (is_eligible(flags_) && is_eligible(st_));
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}
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bool
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fs::cow::is_eligible(const char *fullpath_,
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const int flags_)
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{
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int rv;
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struct stat st;
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if(!fs::cow::is_eligible(flags_))
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return false;
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rv = fs::lstat(fullpath_,&st);
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if(rv < 0)
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return false;
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return fs::cow::is_eligible(st);
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}
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int
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fs::cow::break_link(const char *src_filepath_)
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{
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return fs::copyfile(src_filepath_,
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src_filepath_,
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{ .cleanup_failure = true });
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}
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