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1.10.2
doc/python/examples.rst
282 строки
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Tomas Mlcoch
Add RPMMD analogy for YUM contants (eg. LRO_RPMMDBLIST, LR_RPMMDREPO, etc.) (Issue #51)
10 апр 2015, 16:08
10 апр 2015, 16:08
cae73c3
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.. _examples: Examples ======== Librepo usage examples. [More examples (including C examples)](https://github.com/Tojaj/librepo/tree/master/examples) Simple download of metadata --------------------------- :: """ Example: Simple download whole repository This example uses more "pythonic" way of usage. Instead of use setopt() method it uses class properties. Use case: We have a metalink url of a repository and we want do download complete repository metadata. """ import librepo # Metalink URL METALINK_URL = "https://mirrors.fedoraproject.org/metalink?repo=fedora-18&arch=x86_64" # Destination directory (note: This directory must exists!) DESTDIR = "downloaded_metadata" if __name__ == "__main__": h = librepo.Handle() r = librepo.Result() # Repository with repodata in the rpm-md format h.repotype = librepo.LR_YUMREPO # Set metalink url h.mirrorlist = METALINK_URL # Destination directory for metadata h.destdir = DESTDIR try: h.perform(r) except librepo.LibrepoException as e: # rc - Return code (integer value) # msg - Detailed error message (string) # general_msg - Error message based on rc (string) rc, msg, general_msg = e print "Error: %s" % msg Metadata localisation --------------------- :: """ Example: Localize metadata files of a local repository Use case: We have a local repositository in the rpm-md format and want to paths to all its metadata files. Repomd content is just a bonus. """ import sys import librepo import pprint METADATA_PATH = "downloaded_metadata" if __name__ == "__main__": h = librepo.Handle() r = librepo.Result() # Repository with repodata in the rpm-md format h.setopt(librepo.LRO_REPOTYPE, librepo.LR_YUMREPO) # Path to metadata h.setopt(librepo.LRO_URLS, [METADATA_PATH]) # Do not duplicate (copy) metadata, just localise them h.setopt(librepo.LRO_LOCAL, True) try: h.perform(r) except librepo.LibrepoException as e: rc, msg, general_msg = e print "Error: %s" % msg sys.exit(1) print "Repomd content:" pprint.pprint(r.getinfo(librepo.LRR_YUM_REPOMD)) print "\nPaths to metadata files:" for data_type, path in r.getinfo(librepo.LRR_YUM_REPO).iteritems(): print "%15s: %s" % (data_type, path) sys.exit(0) Checksum verification --------------------- .. note:: Checksum verification is enabled by default. So command ``h.setopt(librepo.LRO_CHECKSUM, True)`` is unnecessary, but for illustration it is better to write the command anyway. :: """ Example: Verify checksum of local metadata Use case: We have some incomplete metadata localy. They are incomplete because they doesn't contain all files specified in repomd.xml. They contains only primary.xml and filelists.xml. We want to check checksum of this metadata. """ import sys import librepo METADATA_PATH = "downloaded_metadata" if __name__ == "__main__": h = librepo.Handle() r = librepo.Result() # Repository with repodata in the rpm-md format h.setopt(librepo.LRO_REPOTYPE, librepo.LR_YUMREPO) # Path to the metadata h.setopt(librepo.LRO_URLS, [METADATA_PATH]) # Do not duplicate (copy) the metadata h.setopt(librepo.LRO_LOCAL, True) # Check checksum of metadata h.setopt(librepo.LRO_CHECKSUM, True) # Ignore missing metadata files h.setopt(librepo.LRO_IGNOREMISSING, True) try: h.perform(r) except librepo.LibrepoException as e: rc, msg, general_msg = e if rc == librepo.LRE_BADCHECKSUM: print "Corrupted metadata! (%s)" % msg else: print "Other error: %s" % msg sys.exit(1) print "Metadata are fine!" More complex download --------------------- :: """ librepo - example of usage """ import os import sys import shutil from pprint import pprint import librepo DESTDIR = "downloaded_metadata" PROGRESSBAR_LEN = 50 def callback(data, total_to_download, downloaded): """Progress callback""" if total_to_download <= 0: return completed = int(downloaded / (total_to_download / PROGRESSBAR_LEN)) print "[%s%s] %8s/%8s (%s)\r" % ('#'*completed, '-'*(PROGRESSBAR_LEN-completed), int(downloaded), int(total_to_download), data), sys.stdout.flush() if __name__ == "__main__": # Prepare destination directory if os.path.exists(DESTDIR): if not os.path.isdir(DESTDIR): raise IOError("%s is not a directory" % DESTDIR) shutil.rmtree(DESTDIR) os.mkdir(DESTDIR) h = librepo.Handle() # Handle represents a download configuration r = librepo.Result() # Result represents an existing/downloaded repository # --- Mandatory arguments ------------------------------------------- # URL of repository or URL of metalink/mirrorlist h.setopt(librepo.LRO_URLS, ["http://ftp.linux.ncsu.edu/pub/fedora/linux/releases/17/Everything/i386/os/"]) #h.setopt(librepo.LRO_MIRRORLIST, "https://mirrors.fedoraproject.org/metalink?repo=fedora-source-17&arch=i386") # Note: LRO_URLS and LRO_MIRRORLIST could be set and used simultaneously # and if download from LRO_URLS failed, then mirrorlist is used # Type of repository h.setopt(librepo.LRO_REPOTYPE, librepo.LR_YUMREPO) # --- Optional arguments -------------------------------------------- # Make download interruptible h.setopt(librepo.LRO_INTERRUPTIBLE, True) # Destination directory for metadata h.setopt(librepo.LRO_DESTDIR, DESTDIR) # Check checksum of all files (if checksum is available in repomd.xml) h.setopt(librepo.LRO_CHECKSUM, True) # Callback to display progress of downloading h.setopt(librepo.LRO_PROGRESSCB, callback) # Set user data for the callback h.setopt(librepo.LRO_PROGRESSDATA, {'test': 'dict', 'foo': 'bar'}) # Download only filelists.xml, prestodelta.xml # Note: repomd.xml is downloaded implicitly! # Note: If LRO_YUMDLIST is None -> all files are downloaded h.setopt(librepo.LRO_YUMDLIST, ["filelists", "prestodelta"]) h.perform(r) # Get and show results pprint (r.getinfo(librepo.LRR_YUM_REPO)) pprint (r.getinfo(librepo.LRR_YUM_REPOMD)) # Whoops... I forget to download primary.xml.. Lets fix it! # Set LRO_UPDATE - only update existing Result h.setopt(librepo.LRO_UPDATE, True) h.setopt(librepo.LRO_YUMDLIST, ["primary"]) h.perform(r) # List of mirrors # (In this case no mirrorlist is used -> list will contain only one url) # Example of access info via attr insted of .getinfo() method pprint (h.mirrors) # Get and show final results pprint (r.getinfo(librepo.LRR_YUM_REPO)) pprint (r.getinfo(librepo.LRR_YUM_REPOMD)) How to get urls in a local mirrorlist ------------------------------------- :: import os import sys import librepo import pprint DESTDIR = "downloaded_metadata" if __name__ == "__main__": h = librepo.Handle() r = librepo.Result() # Correct repotype is important. Without repotype # metalink parser doesn't know suffix which should # be stripped off from the mirrors urls. h.setopt(librepo.LRO_REPOTYPE, librepo.LR_YUMREPO) # Set local mirrorlist file as mirrorlist if os.path.isfile(os.path.join(DESTDIR, "mirrorlist")): h.mirrorlist = os.path.join(DESTDIR, "mirrorlist") elif os.path.isfile(os.path.join(DESTDIR, "metalink.xml")): h.mirrorlist = os.path.join(DESTDIR, "metalink.xml") else: print "No mirrorlist of downloaded repodata available" sys.exit(0) # Download only the mirrorlist during perform() call. h.setopt(librepo.LRO_FETCHMIRRORS, True) h.perform(r) print "Urls in mirrorlist:" print h.mirrors print "Metalink file content:" pprint.pprint(h.metalink)