in the finally-block, we wait for the filter process to die. but it only dies
voluntarily if all data was processed by the filter and it terminates due to EOF.
otoh, if borg has thrown an early exception, e.g. "archive already exists",
we need to kill the filter process to bring it to an early end. in that
case, we also do not need to check the filter rc, because we know we killed it.
looks like with a .tar file created by the tar tool,
tarinfo.mtime is a float [s]. So, after converting to
nanoseconds, we need to cast to int because that's what
Item.mtime wants.
also added a safe_ns() there to clip values to the safe range.
this was used to compare compatibility of our vendored
blake2b code (which we do not have any more) against the
python stdlib blake2b code (which we always use now anyway).
These instances of implicit switch case fallthrough appear to be
intentional. Add comments that the compiler understands to suppress
the false positive warning.
#6338 introduces regression when building with LibreSSL (3.5.0).
```
cc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -O2 -pipe -g -fPIC -O2 -pipe -g -O2 -pipe -g -O2 -pipe -fPIC -Isrc/borg/crypto -I/usr/local/include/python3.9 -c src/borg/crypto/low_level.c -o /tmp/ports/pobj/borgbackup-1.2.1/borg-eec359cf228caf00d9c72bde07bf939872e9d3fa/temp.openbsd-7.1-amd64-3.9/src/borg/crypto/low_level.o
src/borg/crypto/low_level.c:12439:48: error: use of undeclared identifier 'EVP_chacha20_poly1305'; did you mean 'EVP_aead_chacha20_poly1305'?
__pyx_v_self->__pyx_base.__pyx_base.cipher = EVP_chacha20_poly1305;
^~~~~~~~~~~~~~~~~~~~~
EVP_aead_chacha20_poly1305
/usr/include/openssl/evp.h:1161:17: note: 'EVP_aead_chacha20_poly1305' declared here
const EVP_AEAD *EVP_aead_chacha20_poly1305(void);
^
1 error generated.
```
Unfortunately `EVP_aead_chacha20_poly1305`, offered by LibreSSL, is not
a drop in replacement for `EVP_chacha20_poly1305`. More info on the
first can be found at https://man.openbsd.org/EVP_AEAD_CTX_init.3.
The key argument being sent to hashindex_get and hashindex_set by
multiple functions is a different signedness from what the functions
expect. This resolves the issue by changing the key type in the
unpack_user struct to unsigned char.
The value argument of hashindex_set is causing harmless pointer type
mismatches. This resolves the issue by changing the type to void*
which silences these types of warnings.
This resolves a compiler warning from the generated code that
resulted from a comparison of two local variables of different
signedness. The issue is resolved by changing the type of both
to int since this seems like the safest choice available.
All these are unsupported since long.
Newer versions of LibreSSL have gained chacha20-poly1305 support,
but still lack aes256-ocb support.
Also they have the HMAC_CTX_new/free api now.
docs: openssl >= 1.1.1 is required now
anything older is out of support anyway.
