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authorLibravatar Samuel Bronson <naesten@gmail.com>2013-12-18 19:08:11 -0500
committerLibravatar Junio C Hamano <gitster@pobox.com>2013-12-18 16:29:05 -0800
commita21bae33d9e13c59217639b866355f1a02211a2c (patch)
tree2cf4ecbaa203057b608e3142ea12bc05bce7a7fb /t/t4013/diff.format-patch_--inline_--stdout_initial..side
parentt4056: add new tests for "git diff -O" (diff)
downloadtgif-a21bae33d9e13c59217639b866355f1a02211a2c.tar.xz
diff: let "git diff -O" read orderfile from any file and fail properly
The -O flag really shouldn't silently fail to do anything when given a path that it can't read from. However, it should be able to read from un-mmappable files, such as: * pipes/fifos * /dev/null: It's a character device (at least on Linux) * ANY empty file: Quoting Linux mmap(2), "SUSv3 specifies that mmap() should fail if length is 0. However, in kernels before 2.6.12, mmap() succeeded in this case: no mapping was created and the call returned addr. Since kernel 2.6.12, mmap() fails with the error EINVAL for this case." We especially want "-O/dev/null" to work, since we will be documenting it as the way to cancel "diff.orderfile" when we add that. (Note: "-O/dev/null" did have the right effect, since the existing error handling essentially worked out to "silently ignore the orderfile". But this was probably more coincidence than anything else.) So, lets toss all of that logic to get the file mmapped and just use strbuf_read_file() instead, which gives us decent error handling practically for free. Signed-off-by: Samuel Bronson <naesten@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 't/t4013/diff.format-patch_--inline_--stdout_initial..side')
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