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run-tests: mechanism to report exceptions during test execution...
run-tests: mechanism to report exceptions during test execution Sometimes when running tests you introduce a ton of exceptions. The most extreme example of this is running Mercurial with Python 3, which currently spews thousands of exceptions when running the test harness. This commit adds an opt-in feature to run-tests.py to aggregate exceptions encountered by `hg` when running tests. When --exceptions is used, the test harness enables the "logexceptions" extension in the test environment. This extension wraps the Mercurial function to handle exceptions and writes information about the exception to a random filename in a directory defined by the test harness via an environment variable. At the end of the test harness, these files are parsed, aggregated, and a list of all unique Mercurial frames triggering exceptions is printed in order of frequency. This feature is intended to aid Python 3 development. I've only really tested it on Python 3. There is no shortage of improvements that could be made. e.g. we could write a separate file containing the exception report - maybe even an HTML report. We also don't capture which tests demonstrate the exceptions, so there's no turnkey way to test whether a code change made an exception disappear. Perfect is the enemy of good. I think the current patch is useful enough to land. Whoever uses it can send patches to imprve its usefulness. Differential Revision: https://phab.mercurial-scm.org/D1477
Gregory Szorc - - Load All Authors

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Generate a private key (priv.pem):
$ openssl genrsa -out priv.pem 2048
Generate 2 self-signed certificates from this key (pub.pem, pub-other.pem):
$ openssl req -new -x509 -key priv.pem -nodes -sha256 -days 9000 \
-out pub.pem -batch -subj '/CN=localhost/emailAddress=hg@localhost/'
$ openssl req -new -x509 -key priv.pem -nodes -sha256 -days 9000 \
-out pub-other.pem -batch -subj '/CN=localhost/emailAddress=hg@localhost/'
Now generate an expired certificate by turning back the system time:
$ faketime 2016-01-01T00:00:00Z \
openssl req -new -x509 -key priv.pem -nodes -sha256 -days 1 \
-out pub-expired.pem -batch -subj '/CN=localhost/emailAddress=hg@localhost/'
Generate a certificate not yet active by advancing the system time:
$ faketime 2030-01-1T00:00:00Z \
openssl req -new -x509 -key priv.pem -nodes -sha256 -days 1 \
-out pub-not-yet.pem -batch -subj '/CN=localhost/emailAddress=hg@localhost/'
Generate a passphrase protected client certificate private key:
$ openssl genrsa -aes256 -passout pass:1234 -out client-key.pem 2048
Create a copy of the private key without a passphrase:
$ openssl rsa -in client-key.pem -passin pass:1234 -out client-key-decrypted.pem
Create a CSR and sign the key using the server keypair:
$ printf '.\n.\n.\n.\n.\n.\nhg-client@localhost\n.\n.\n' | \
openssl req -new -key client-key.pem -passin pass:1234 -out client-csr.pem
$ openssl x509 -req -days 9000 -in client-csr.pem -CA pub.pem -CAkey priv.pem \
-set_serial 01 -out client-cert.pem
When replacing the certificates, references to certificate fingerprints will
need to be updated in test files.
Fingerprints for certs can be obtained by running:
$ openssl x509 -in pub.pem -noout -sha1 -fingerprint
$ openssl x509 -in pub.pem -noout -sha256 -fingerprint