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CHAPTER 17 FTP
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f.login() f.cwd('/pub/academic/astronomy/') entries = [] f.dir(entries.append) print "%d entries:" % len(entries) for entry in entries: print entry f.quit() Notice that the filenames are in a convenient format for automated processing a bare list of filenames but that is no extra information. Contrast the bare list of file names we saw earlier with the output from Listing 17 8, which uses dir(): $ python dir.py 13 entries: -rw-r--r-1 ( ) -rw-r--r-1 root -rw-r--r-1 ( ) drwxr-xr-x 2 ( ) drwxr-xr-x 2 ( ) -rw-r--r-1 ( ) -rw-r--r-1 ( ) -rw-r--r-1 ( ) -rw-r--r-1 ( ) drwxr-xr-x 2 ( ) -rw-r--r-1 ( ) -rw-r--r-1 ( ) -rw-r--r-1 ( )
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The dir() method takes a function that it calls for each line, delivering the directory listing in pieces just like retrlines() delivers the contents of particular files. Here, we simply supply the append() method of our plain old Python entries list.
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Detecting Directories and Recursive Download
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If you cannot guarantee what information an FTP server might choose to return from its dir() command, how are you going to tell directories from normal files an essential step to downloading entire trees of files from the server The answer, shown in Listing 17 9, is to simply try a cwd() into every name that nlst() returns and, if you succeed, conclude that the entity is a directory! This sample program does not do any actual downloading; instead, to keep things simple (and not flood your disk with sample data), it simply prints out the directories it visits to the screen. Listing 17 9. Trying to Recurse into Directories #!/usr/bin/env python # Recursive downloader - 17 - recursedl.py import os, sys from ftplib import FTP, error_perm def walk_dir(f, dirpath): original_dir = f.pwd()
CHAPTER 17 FTP
try: f.cwd(dirpath) except error_perm: return # ignore non-directories and ones we cannot enter print dirpath names = f.nlst() for name in names: walk_dir(f, dirpath + '/' + name) f.cwd(original_dir) # return to cwd of our caller
f = FTP('ftp.kernel.org') f.login() walk_dir(f, '/pub/linux/kernel/Historic/old-versions') f.quit() This sample program will run a bit slow there are, it turns out, quite a few files in the old-versions directory on the Linux Kernel Archive but within a few dozen seconds, you should see the resulting directory tree displayed on the screen: $ python recursedl.py /pub/linux/kernel/Historic/old-versions /pub/linux/kernel/Historic/old-versions/impure /pub/linux/kernel/Historic/old-versions/old /pub/linux/kernel/Historic/old-versions/old/corrupt /pub/linux/kernel/Historic/old-versions/tytso By adding a few print statements, you could supplement this list of directories by displaying every one of the files that the recursive process is (slowly) discovering. And by adding another few lines of code, you could be downloading the files themselves to corresponding directories that you create locally. But the only really essential logic for a recursive download is already operating in Listing 17 9: the only foolproof way to know if an entry is a directory that you are allowed to enter is to try running cwd() against it.
Creating Directories, Deleting Things
Finally, FTP supports file deletion, and supports both the creation and deletion of directories. These more obscure calls are all described in the ftplib documentation: delete(filename) will delete a file from the server. mkd(dirname) attempts to create a new directory. rmd(dirname) will delete a directory; note that most systems require the directory to be empty first. rename(oldname, newname) works, essentially, like the Unix command mv: if both names are in the same directory, the file is essentially re-named; but if the destination specifies a name in a different directory, then the file is actually moved.
Note that these commands, like all other FTP operations, are performed more or less as though you were really logged on to the remote server command line as the same username with which you logged into FTP and the chances of your having permission to manipulate files on a given server are lower than being able to download files, or even to create new files in an upload directory. Still, it is because of
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