fetch-pack: redact packfile urls in traces

Changes since v6:

* Use specific hash sizes instead of hexsz
* Remove unnecessary env vars in tests
* Added comment on bit toggle

Changes since v5:

* Use hexsz instead of hardcoded hash sizes

Changes since v4:

* Use "uri" instead of "url"
* Look specifically for a line with packfile-uri format (instead of for a URL in general)
* Limit the redacting to the packfile-uri section in do_fetch_pack_v2
* Use "%.*s" instead of duplicating parts of the string to print

Changes since v3:

* Enable redacting URLs for all sections
* Redact only URL path (it was until the end of line)
* Redact URL in die() with more friendly message
* Update doc to mention that packfile URIs are also redacted.

Changes since v2:

* Redact only the path of the URL
* Test are now strict, validating the exact line expected in the log

Changes since v1:

* Removed non-POSIX flags in tests
* More accurate regex for the non-encrypted packfile line
* Dropped documentation change
* Dropped redacting the die message in http-fetch

Ivan Frade (2):
fetch-pack: redact packfile urls in traces
http-fetch: redact url on die() message

 Documentation/git.txt  |  5 +++--
 fetch-pack.c           |  5 +++++
 http-fetch.c           | 14 ++++++++++--
 pkt-line.c             | 40 ++++++++++++++++++++++++++++++++-
 pkt-line.h             |  1 +
 t/t5702-protocol-v2.sh | 51 ++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 111 insertions(+), 5 deletions(-)

base-commit: 88d915a634b449147855041d44875322de2b286d
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1052%2Fifradeo%2Fredact-packfile-uri-v7
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1052/ifradeo/redact-packfile-uri-v7
Pull-Request: https://github.com/gitgitgadget/git/pull/1052

Range-diff vs v6:

1: a6098f98946 ! 1: bbfdc346ede fetch-pack: redact packfile urls in traces

     @@ fetch-pack.c: static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
      +				reader.options |= PACKET_READ_REDACT_URI_PATH;
       			if (process_section_header(&reader, "packfile-uris", 1))
       				receive_packfile_uris(&reader, &packfile_uris);
     ++			/* We don't expect more URIs. Reset to avoid expensive URI check. */
      +			reader.options &= ~PACKET_READ_REDACT_URI_PATH;
      +
       			process_section_header(&reader, "packfile", 0);
     @@ pkt-line.c: int packet_length(const char lenbuf_hex[4])
      +	buffer += 1;
      +
      +	len = strspn(buffer, "0123456789abcdefABCDEF");
     -+	if (len != (int)the_hash_algo->hexsz || buffer[len] != ' ')
     ++	/* size of SHA1 and SHA256 hash */
     ++	if (!(len == 40 || len == 64) || buffer[len] != ' ')
      +		return NULL; /* required "<hash>SP" not seen */
      +
      +	path = strstr(buffer + len + 1, URI_MARK);
     @@ t/t5702-protocol-v2.sh: test_expect_success 'packfile-uri with transfer.fsckobje
      +		"uploadpack.blobpackfileuri" \
      +		"$(cat objh) $(cat packh) $HTTPD_URL/dumb/mypack-$(cat packh).pack" &&
      +
     -+	GIT_TRACE=1 GIT_TRACE_PACKET="$(pwd)/log" GIT_TEST_SIDEBAND_ALL=1 \
     ++	GIT_TRACE_PACKET="$(pwd)/log" \
      +	git -c protocol.version=2 \
      +		-c fetch.uriprotocols=http,https \
      +		clone "$HTTPD_URL/smart/http_parent" http_child &&
     @@ t/t5702-protocol-v2.sh: test_expect_success 'packfile-uri with transfer.fsckobje
      +		"uploadpack.blobpackfileuri" \
      +		"$(cat objh) $(cat packh) $HTTPD_URL/dumb/mypack-$(cat packh).pack" &&
      +
     -+	GIT_TRACE=1 GIT_TRACE_PACKET="$(pwd)/log" GIT_TEST_SIDEBAND_ALL=1 \
     ++	GIT_TRACE_PACKET="$(pwd)/log" \
      +	GIT_TRACE_REDACT=0 \
      +	git -c protocol.version=2 \
      +		-c fetch.uriprotocols=http,https \

2: 38859ae7b7d = 2: 3b210735bc8 http-fetch: redact url on die() message

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