Logging

How to log and debug a conan execution

You can use the CONAN_TRACE_FILE environment variable to log and debug several Conan command execution. Set the CONAN_TRACE_FILE environment variable pointing to a log file.

Example:

export CONAN_TRACE_FILE=/tmp/conan_trace.log # Or SET in windows
conan install zlib/1.2.8@lasote/stable

The /tmp/conan_trace.log file:

{"_action": "COMMAND", "name": "install", "parameters": {"all": false, "build": null, "env": null, "file": null, "generator": null, "manifests": null, "manifests_interactive": null, "no_imports": false, "options": null, "package": null, "profile": null, "reference": "zlib/1.2.8@lasote/stable", "remote": null, "scope": null, "settings": null, "update": false, "verify": null, "werror": false}, "time": 1485345289.250117}
{"_action": "REST_API_CALL", "duration": 1.8255090713500977, "headers": {"Authorization": "**********", "X-Client-Anonymous-Id": "**********", "X-Client-Id": "lasote2", "X-Conan-Client-Version": "0.19.0-dev"}, "method": "GET", "time": 1485345291.092218, "url": "https://server.conan.io/v1/conans/zlib/1.2.8/lasote/stable/download_urls"}
{"_action": "DOWNLOAD", "duration": 0.4136989116668701, "time": 1485345291.506399, "url": "https://conanio-production.s3.amazonaws.com/storage/zlib/1.2.8/lasote/stable/export/conanmanifest.txt"}
{"_action": "DOWNLOAD", "duration": 0.10367798805236816, "time": 1485345291.610335, "url": "https://conanio-production.s3.amazonaws.com/storage/zlib/1.2.8/lasote/stable/export/conanfile.py"}
{"_action": "DOWNLOAD", "duration": 0.059114933013916016, "time": 1485345291.669744, "url": "https://conanio-production.s3.amazonaws.com/storage/zlib/1.2.8/lasote/stable/export/conan_export.tgz"}
{"_action": "DOWNLOADED_RECIPE", "_id": "zlib/1.2.8@lasote/stable", "duration": 2.40762996673584, "files": {"conan_export.tgz": "/home/laso/.conan/data/zlib/1.2.8/lasote/stable/export/conan_export.tgz", "conanfile.py": "/home/laso/.conan/data/zlib/1.2.8/lasote/stable/export/conanfile.py", "conanmanifest.txt": "/home/laso/.conan/data/zlib/1.2.8/lasote/stable/export/conanmanifest.txt"}, "remote": "conan.io", "time": 1485345291.670017}
{"_action": "REST_API_CALL", "duration": 0.4844989776611328, "headers": {"Authorization": "**********", "X-Client-Anonymous-Id": "**********", "X-Client-Id": "lasote2", "X-Conan-Client-Version": "0.19.0-dev"}, "method": "GET", "time": 1485345292.160912, "url": "https://server.conan.io/v1/conans/zlib/1.2.8/lasote/stable/packages/c6d75a933080ca17eb7f076813e7fb21aaa740f2/download_urls"}
{"_action": "DOWNLOAD", "duration": 0.06388187408447266, "time": 1485345292.225308, "url": "https://conanio-production.s3.amazonaws.com/storage/zlib/1.2.8/lasote/stable/package/c6d75a933080ca17eb7f076813e7fb21aaa740f2/conaninfo.txt?Signature=c1KAOqvxtCUnnQOeYizZ9bgcwwY%3D&Expires=1485352492&AWSAccessKeyId=AKIAJXMWDMVCDMAZQK5Q"}
{"_action": "REST_API_CALL", "duration": 0.8182470798492432, "headers": {"Authorization": "**********", "X-Client-Anonymous-Id": "**********", "X-Client-Id": "lasote2", "X-Conan-Client-Version": "0.19.0-dev"}, "method": "GET", "time": 1485345293.044904, "url": "https://server.conan.io/v1/conans/zlib/1.2.8/lasote/stable/packages/c6d75a933080ca17eb7f076813e7fb21aaa740f2/download_urls"}
{"_action": "DOWNLOAD", "duration": 0.07849907875061035, "time": 1485345293.123831, "url": "https://conanio-production.s3.amazonaws.com/storage/zlib/1.2.8/lasote/stable/package/c6d75a933080ca17eb7f076813e7fb21aaa740f2/conanmanifest.txt"}
{"_action": "DOWNLOAD", "duration": 0.06638002395629883, "time": 1485345293.190465, "url": "https://conanio-production.s3.amazonaws.com/storage/zlib/1.2.8/lasote/stable/package/c6d75a933080ca17eb7f076813e7fb21aaa740f2/conaninfo.txt"}
{"_action": "DOWNLOAD", "duration": 0.3634459972381592, "time": 1485345293.554206, "url": "https://conanio-production.s3.amazonaws.com/storage/zlib/1.2.8/lasote/stable/package/c6d75a933080ca17eb7f076813e7fb21aaa740f2/conan_package.tgz"}
{"_action": "DOWNLOADED_PACKAGE", "_id": "zlib/1.2.8@lasote/stable:c6d75a933080ca17eb7f076813e7fb21aaa740f2", "duration": 1.3279249668121338, "files": {"conan_package.tgz": "/home/laso/.conan/data/zlib/1.2.8/lasote/stable/package/c6d75a933080ca17eb7f076813e7fb21aaa740f2/conan_package.tgz", "conaninfo.txt": "/home/laso/.conan/data/zlib/1.2.8/lasote/stable/package/c6d75a933080ca17eb7f076813e7fb21aaa740f2/conaninfo.txt", "conanmanifest.txt": "/home/laso/.conan/data/zlib/1.2.8/lasote/stable/package/c6d75a933080ca17eb7f076813e7fb21aaa740f2/conanmanifest.txt"}, "remote": "conan.io", "time": 1485345293.554466}

In the traces we can see:

A command install execution.
A REST API call to get some download_urls.
Three files downloaded (corresponding to the previously retrieved urls).
DOWNLOADED_RECIPE tells us that the recipe retrieving is finished. We can see that the whole retrieve process took 2.4 seconds.
Conan client has computed the SHA for the needed binary package and will now retrieve it. So it will request and download the package package_id file to perform some checks like outdated binaries.
Another REST API call to get some more download_urls, for the package files and download them.
Finally we get a DOWNLOADED_PACKAGE telling us that the package has been downloaded. The download took 1.3 seconds.

If we execute conan install again:

export CONAN_TRACE_FILE=/tmp/conan_trace.log # Or SET in windows
conan install zlib/1.2.8@lasote/stable

The /tmp/conan_trace.log file only three lines will be appended:

{"_action": "COMMAND", "name": "install", "parameters": {"all": false, "build": null, "env": null, "file": null, "generator": null, "manifests": null, "manifests_interactive": null, "no_imports": false, "options": null, "package": null, "profile": null, "reference": "zlib/1.2.8@lasote/stable", "remote": null, "scope": null, "settings": null, "update": false, "verify": null, "werror": false}, "time": 1485346039.817543}
{"_action": "GOT_RECIPE_FROM_LOCAL_CACHE", "_id": "zlib/1.2.8@lasote/stable", "time": 1485346039.824949}
{"_action": "GOT_PACKAGE_FROM_LOCAL_CACHE", "_id": "zlib/1.2.8@lasote/stable:c6d75a933080ca17eb7f076813e7fb21aaa740f2", "time": 1485346039.827915}

A command install execution.
A GOT_RECIPE_FROM_LOCAL_CACHE because it’s already stored in local cache.
A GOT_PACKAGE_FROM_LOCAL_CACHE because the package is cached too.

How to log the build process

You can log your command executions self.run in a file named conan_run.log using the environment variable CONAN_LOG_RUN_TO_FILE.

You can also use the variable CONAN_PRINT_RUN_COMMANDS to log extra information about the commands being executed.

Package the log files

The conan_run.log file will be created in your build folder so you can package it the same way you package a library file:

def package(self):
    self.copy(pattern="conan_run.log", dst="", keep_path=False)