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On Sat, Dec 28, 2013 at 5:57 PM, Brian Dolbec <dolsen@g.o> wrote: |
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|
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> Cleans up all self.mounts, self.mountmap usage. |
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> Replace multiple path additions with one instance at the beginning of the |
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> function, reuse the result multiple times. |
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> Add some extra debug prints (to be converted to logging later) |
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> --- |
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> modules/generic_stage_target.py | 94 |
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> ++++++++++++++++++++++++++--------------- |
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> modules/stage1_target.py | 5 ++- |
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> 2 files changed, 63 insertions(+), 36 deletions(-) |
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> |
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> diff --git a/modules/generic_stage_target.py |
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> b/modules/generic_stage_target.py |
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> index ce28ab8..c8d31e1 100644 |
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> --- a/modules/generic_stage_target.py |
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> +++ b/modules/generic_stage_target.py |
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> @@ -4,6 +4,23 @@ from generic_target import * |
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> from stat import * |
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> import catalyst_lock |
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> |
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> +# temporary location. It will be moved to a |
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> +# new defaults file in a later comit |
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> +TARGET_MOUNTS_DEFAULTS = { |
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> + "proc": "/proc", |
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> + "dev": "/dev", |
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> + "devpts": "/dev/pts", |
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> + "portdir": "/usr/portage", |
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> + "distdir": "/usr/portage/distfiles", |
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> + "packagedir": "/usr/portage/packages", |
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> + "port_tmpdir": "/var/tmp/portage", |
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> + "kerncache": "/tmp/kerncache", |
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> + "ccache": "/var/tmp/ccache", |
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> + "icecream": "/usr/lib/icecc/bin", |
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> + "port_logdir": "/var/log/portage", |
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> + } |
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> + |
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> + |
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> class generic_stage_target(generic_target): |
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> """ |
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> This class does all of the chroot setup, copying of files, etc. It |
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> is |
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> @@ -173,6 +190,10 @@ class generic_stage_target(generic_target): |
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> |
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> file_locate(self.settings,["portage_confdir"],expand=0) |
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> |
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> """ Setup our mount points """ |
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> + # initialize our target mounts. |
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> + # later I plan to make these configurable so the |
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> + # defaults can be easily overridden if desired. |
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> + self.target_mounts = TARGET_MOUNTS_DEFAULTS.copy() |
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> if "SNAPCACHE" in self.settings: |
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> self.mounts=["proc", "dev", "portdir", "distdir", |
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> "port_tmpdir"] |
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> self.mountmap={"proc":"/proc", "dev":"/dev", |
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> "devpts":"/dev/pts", |
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> @@ -219,17 +240,18 @@ class generic_stage_target(generic_target): |
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> self.mounts.append("ccache") |
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> self.mountmap["ccache"] = ccdir |
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> """ for the chroot: """ |
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> - self.env["CCACHE_DIR"]="/var/tmp/ccache" |
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> + self.env["CCACHE_DIR"] = |
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> self.target_mounts["ccache"] |
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> |
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> if "ICECREAM" in self.settings: |
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> self.mounts.append("/var/cache/icecream") |
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> |
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> self.mountmap["/var/cache/icecream"]="/var/cache/icecream" |
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> - |
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> self.env["PATH"]="/usr/lib/icecc/bin:"+self.env["PATH"] |
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> + self.env["PATH"] = self.target_mounts["icecream"] |
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> + ":" + \ |
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> + self.env["PATH"] |
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> |
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if "port_logdir" in self.settings: |
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> - self.mounts.append("/var/log/portage") |
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> - |
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> self.mountmap["/var/log/portage"]=self.settings["port_logdir"] |
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> - self.env["PORT_LOGDIR"]="/var/log/portage" |
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> + self.mounts.append("port_logdir") |
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> + |
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> self.mountmap["port_logdir"]=self.settings["port_logdir"] |
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> + |
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> self.env["PORT_LOGDIR"]=self.target_mounts["port_logdir"] |
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> self.env["PORT_LOGDIR_CLEAN"]='find |
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> "${PORT_LOGDIR}" -type f ! -name "summary.log*" -mtime +30 -delete' |
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> |
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|
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I've avoided commenting on + in strings, as my understanding was that we |
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were not doing style fixups in these CLs. I would argue that in general, |
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any time you use string + string in python, you are doing it wrong (e.g. |
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your code is not 'pythonic') |
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|
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You can use |
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|
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"%s:%s" % (string1, string2) or ":".join(string1, string2) |
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|
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Either are fine, and are nominally better than string + string + string. |
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|
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|
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|
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> |
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> def override_cbuild(self): |
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> @@ -603,33 +625,34 @@ class generic_stage_target(generic_target): |
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> "kill-chroot-pids script |
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> failed.",env=self.env) |
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> |
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> def mount_safety_check(self): |
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> - mypath=self.settings["chroot_path"] |
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> - |
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> """ |
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> Check and verify that none of our paths in mypath are |
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> mounted. We don't |
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> want to clean up with things still mounted, and this |
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> allows us to check. |
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> Returns 1 on ok, 0 on "something is still mounted" case. |
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> """ |
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> |
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> - if not os.path.exists(mypath): |
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> + if not os.path.exists(self.settings["chroot_path"]): |
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> return |
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> |
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> + print "self.mounts =", self.mounts |
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> for x in self.mounts: |
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> - if not os.path.exists(mypath + self.mountmap[x]): |
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> + target = normpath(self.settings["chroot_path"] + |
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> self.target_mounts[x]) |
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> + print "mount_safety_check() x =", x, target |
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> + if not os.path.exists(target): |
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> continue |
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> |
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> - if ismount(mypath + self.mountmap[x]): |
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> + if ismount(target): |
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> """ Something is still mounted "" """ |
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> try: |
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> - print self.mountmap[x] + " is |
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> still mounted; performing auto-bind-umount...", |
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> + print target + " is still mounted; |
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> performing auto-bind-umount...", |
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> """ Try to umount stuff ourselves |
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> """ |
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> self.unbind() |
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> - if ismount(mypath + |
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> self.mountmap[x]): |
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> - raise CatalystError, |
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> "Auto-unbind failed for " + self.mountmap[x] |
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> + if ismount(target): |
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> + raise CatalystError, |
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> "Auto-unbind failed for " + target |
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> else: |
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> print "Auto-unbind |
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> successful..." |
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> except CatalystError: |
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> - raise CatalystError, "Unable to |
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> auto-unbind " + self.mountmap[x] |
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> + raise CatalystError, "Unable to |
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> auto-unbind " + target |
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> |
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> def unpack(self): |
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> unpack=True |
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> @@ -897,12 +920,14 @@ class generic_stage_target(generic_target): |
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> |
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> def bind(self): |
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> for x in self.mounts: |
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> - if not os.path.exists(self.settings["chroot_path"] |
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> + self.mountmap[x]): |
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> - |
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> os.makedirs(self.settings["chroot_path"]+x,0755) |
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> + #print "bind(); x =", x |
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> + target = normpath(self.settings["chroot_path"] + |
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> self.target_mounts[x]) |
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> + if not os.path.exists(target): |
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> + os.makedirs(target, 0755) |
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> |
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> if not os.path.exists(self.mountmap[x]): |
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> if not self.mountmap[x] == "tmpfs": |
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> - os.makedirs(self.mountmap[x],0755) |
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> + os.makedirs(self.mountmap[x], 0755) |
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> |
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> src=self.mountmap[x] |
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> #print "bind(); src =", src |
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> @@ -910,20 +935,22 @@ class generic_stage_target(generic_target): |
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> self.snapshot_lock_object.read_lock() |
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> if os.uname()[0] == "FreeBSD": |
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> if src == "/dev": |
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> - retval = os.system("mount -t devfs |
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> none " + |
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> - |
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> self.settings["chroot_path"] + src) |
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> + cmd = "mount -t devfs none " + |
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> target |
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> + retval=os.system(cmd) |
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> |
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|
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"because the code use to do it" aside, is there some compelling reason to |
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not use subprocess.Popen here? os.system is probably the worst syscall you |
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can use. It spawns a shell, it will select things like './mount' over |
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'/usr/bin/mount' because you failed to specify the full path to the binary, |
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its not clear what environment the shell is using. |
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|
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Even something like: |
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|
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import subprocess |
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retval = subprocess.call(cmd.split()) |
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|
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would likely avoid these problems unless you are relying on shell expansion |
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in cmd? |
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|
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|
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|
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|
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> else: |
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> - retval = os.system("mount_nullfs " |
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> + src + " " + |
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> - |
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> self.settings["chroot_path"] + src) |
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> + cmd = "mount_nullfs " + src + " " |
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> + target |
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> + retval=os.system(cmd) |
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> else: |
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> if src == "tmpfs": |
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> if "var_tmpfs_portage" in |
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> self.settings: |
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> - retval=os.system("mount -t |
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> tmpfs -o size="+\ |
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> - |
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> self.settings["var_tmpfs_portage"]+"G "+src+" "+\ |
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> - |
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> self.settings["chroot_path"]+x) |
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> + cmd = "mount -t tmpfs -o |
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> size=" + \ |
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> + |
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> self.settings["var_tmpfs_portage"] + "G " + \ |
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> + src + " " + target |
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> + retval=os.system(cmd) |
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> else: |
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> - retval = os.system("mount --bind " |
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> + src + " " + |
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> - |
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> self.settings["chroot_path"] + src) |
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> + cmd = "mount --bind " + src + " " |
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> + target |
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> + #print "bind(); cmd =", cmd |
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> + retval=os.system(cmd) |
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> if retval!=0: |
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> self.unbind() |
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> raise CatalystError,"Couldn't bind mount " |
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> + src |
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> @@ -935,26 +962,25 @@ class generic_stage_target(generic_target): |
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> myrevmounts.reverse() |
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> """ Unmount in reverse order for nested bind-mounts """ |
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> for x in myrevmounts: |
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> - if not os.path.exists(mypath + self.mountmap[x]): |
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> + target = normpath(mypath + self.target_mounts[x]) |
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> + if not os.path.exists(target): |
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> continue |
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> |
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> - if not ismount(mypath + self.mountmap[x]): |
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> + if not ismount(target): |
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> continue |
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> |
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> - retval=os.system("umount "+\ |
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> - os.path.join(mypath, |
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> self.mountmap[x].lstrip(os.path.sep))) |
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> + retval=os.system("umount " + target) |
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> |
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> if retval!=0: |
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> - warn("First attempt to unmount: " + mypath |
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> + |
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> - self.mountmap[x] +" failed.") |
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> + warn("First attempt to unmount: " + target |
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> + " failed.") |
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> warn("Killing any pids still running in |
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> the chroot") |
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> |
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> self.kill_chroot_pids() |
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> |
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> - retval2 = os.system("umount " + mypath + |
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> self.mountmap[x]) |
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> + retval2 = os.system("umount " + target) |
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> if retval2!=0: |
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> ouch=1 |
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> - warn("Couldn't umount bind mount: |
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> " + mypath + self.mountmap[x]) |
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> + warn("Couldn't umount bind mount: |
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> " + target) |
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> |
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> if "SNAPCACHE" in self.settings and x == |
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> "/usr/portage": |
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> try: |
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> diff --git a/modules/stage1_target.py b/modules/stage1_target.py |
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> index aa43926..1e0d874 100644 |
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> --- a/modules/stage1_target.py |
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> +++ b/modules/stage1_target.py |
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> @@ -88,8 +88,9 @@ class stage1_target(generic_stage_target): |
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> os.makedirs(self.settings["stage_path"]+"/proc") |
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> |
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> # alter the mount mappings to bind mount proc onto it |
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> - self.mounts.append("/tmp/stage1root/proc") |
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> - self.mountmap["/tmp/stage1root/proc"]="/proc" |
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> + self.mounts.append("stage1root/proc") |
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> + self.target_mounts["stage1root/proc"] = |
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> "/tmp/stage1root/proc" |
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> + self.mountmap["stage1root/proc"]="/proc" |
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> |
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> def register(foo): |
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> foo.update({"stage1":stage1_target}) |
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> -- |
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> 1.8.3.2 |
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> |
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> |
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> |