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Use lutimes() if available to canonicalise the timestamp of symlinks

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Also use utimes() instead of utime() if lutimes() is not available.
This commit is contained in:
Eelco Dolstra 2012-07-23 16:52:25 -04:00
parent 1832ab71db
commit 6852289c46
2 changed files with 21 additions and 9 deletions
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5
configure.ac
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@ -115,6 +115,11 @@ AC_CHECK_HEADERS([sys/mount.h], [], [],
]) ])
# Check for lutimes, optionally used for changing the mtime of
# symlinks.
AC_CHECK_FUNCS([lutimes])
# Check for <locale>. # Check for <locale>.
AC_LANG_PUSH(C++) AC_LANG_PUSH(C++)
AC_CHECK_HEADERS([locale]) AC_CHECK_HEADERS([locale])

21
src/libstore/local-store.cc
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@ -12,6 +12,7 @@
#include <sys/types.h> #include <sys/types.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h> #include <unistd.h>
#include <utime.h> #include <utime.h>
#include <fcntl.h> #include <fcntl.h>
@ -458,14 +459,20 @@ void canonicalisePathMetaData(const Path & path, bool recurse)
throw SysError(format("changing mode of `%1%' to %2$o") % path % mode); throw SysError(format("changing mode of `%1%' to %2$o") % path % mode);
} }
if (st.st_mtime != mtimeStore) { }
struct utimbuf utimbuf;
utimbuf.actime = st.st_atime;
utimbuf.modtime = mtimeStore;
if (utime(path.c_str(), &utimbuf) == -1)
throw SysError(format("changing modification time of `%1%'") % path);
}
if (st.st_mtime != mtimeStore) {
struct timeval times[2];
times[0].tv_sec = st.st_atime;
times[0].tv_usec = 0;
times[1].tv_sec = mtimeStore;
times[1].tv_usec = 0;
#if HAVE_LUTIMES
if (lutimes(path.c_str(), times) == -1)
#else
if (!S_ISLNK(st.st_mode) && utimes(path.c_str(), times) == -1)
#endif
throw SysError(format("changing modification time of `%1%'") % path);
} }
if (recurse && S_ISDIR(st.st_mode)) { if (recurse && S_ISDIR(st.st_mode)) {