Am 06.02.2017 um 18:07 schrieb James Cowgill: > Source: systemd > Version: 232-15 > Severity: important > > Hi, > > While testing #852811 I discovered that systemd does not build within an > overlayfs schroot (which all my mips chroots are setup as). Specifically > the "test-copy" test fails with: > >> FAIL: test-copy >> =============== >> >> test_copy_file >> test_copy_file_fd >> test_copy_tree >> Assertion 'access(f, F_OK) == 0' failed at ../src/test/test-copy.c:136, >> function test_copy_tree(). Aborting. >> FAIL test-copy (exit status: 134) > > The assertion is caused by a file not being copied by copy_tree and that > is in turn caused by this line: > https://sources.debian.net/src/systemd/232-15/src/basic/copy.c/#L342 > > The above line does not copy files if the device of the file is not the > same as the device of the parent directory, however on an overlayfs > filesystem this is condition is always true for non-directories. > > From https://www.kernel.org/doc/Documentation/filesystems/overlayfs.txt: >> This approach is 'hybrid' because the objects that appear in the >> filesystem do not all appear to belong to that filesystem. In many >> cases an object accessed in the union will be indistinguishable >> from accessing the corresponding object from the original filesystem. >> This is most obvious from the 'st_dev' field returned by stat(2). >> >> While directories will report an st_dev from the overlay-filesystem, >> all non-directory objects will report an st_dev from the lower or >> upper filesystem that is providing the object. Similarly st_ino will >> only be unique when combined with st_dev, and both of these can change >> over the lifetime of a non-directory object. Many applications and >> tools ignore these values and will not be affected. > > Note that this behavior is different from say 'cp -Rx'. cp only checks > the value of st_dev if the file is a directory. This allows it to work > correctly with overlayfs. > http://sources.debian.net/src/coreutils/8.26-2/src/copy.c/?hl=2547#L2547 >
I think this is a bug in overlayfs. -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth?
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