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979d5a7cae
Since we dropped fs::symlink_exists, we no longer have a need for the fs namespace. Having less abstractions makes it easier to lookup the functions in reference documentations.
69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
#include <cerrno>
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#include <climits>
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#include <cstdio>
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#include <cstdlib>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include "nix/util/file-system.hh"
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#include "util-unix-config-private.hh"
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namespace nix {
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Descriptor openDirectory(const std::filesystem::path & path)
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{
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return open(path.c_str(), O_RDONLY | O_DIRECTORY);
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}
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void setWriteTime(
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const std::filesystem::path & path, time_t accessedTime, time_t modificationTime, std::optional<bool> optIsSymlink)
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{
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// Would be nice to use std::filesystem unconditionally, but
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// doesn't support access time just modification time.
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//
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// System clock vs File clock issues also make that annoying.
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#if HAVE_UTIMENSAT && HAVE_DECL_AT_SYMLINK_NOFOLLOW
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struct timespec times[2] = {
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{
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.tv_sec = accessedTime,
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.tv_nsec = 0,
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},
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{
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.tv_sec = modificationTime,
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.tv_nsec = 0,
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},
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};
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if (utimensat(AT_FDCWD, path.c_str(), times, AT_SYMLINK_NOFOLLOW) == -1)
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throw SysError("changing modification time of %s (using `utimensat`)", path);
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#else
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struct timeval times[2] = {
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{
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.tv_sec = accessedTime,
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.tv_usec = 0,
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},
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{
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.tv_sec = modificationTime,
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.tv_usec = 0,
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},
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};
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# if HAVE_LUTIMES
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if (lutimes(path.c_str(), times) == -1)
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throw SysError("changing modification time of %s", path);
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# else
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bool isSymlink = optIsSymlink ? *optIsSymlink : std::filesystem::is_symlink(path);
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if (!isSymlink) {
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if (utimes(path.c_str(), times) == -1)
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throw SysError("changing modification time of %s (not a symlink)", path);
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} else {
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throw Error("Cannot change modification time of symlink %s", path);
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}
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# endif
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#endif
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}
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}
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