Move the run part of LoraxTemplateRunner into new TemplateRunner class
This will make it easier to add a new subclass that only handles installpkg for use with livemedia-creator and lorax-composer iso creation.
This commit is contained in:
Brian C. Lane
parent
a0ff34dcb1
commit
8eaad3bc5e
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@ -103,8 +103,83 @@ def rexists(pathname, root=""):
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return True
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return False
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class TemplateRunner(object):
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'''
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This class parses and executes Lorax templates. Sample usage:
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# install a bunch of packages
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runner = LoraxTemplateRunner(inroot=rundir, outroot=rundir, dbo=dnf_obj)
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runner.run("install-packages.ltmpl")
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NOTES:
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* Parsing procedure is roughly:
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1. Mako template expansion (on the whole file)
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2. For each line of the result,
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a. Whitespace splitting (using shlex.split())
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b. Brace expansion (using brace_expand())
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c. If the first token is the name of a function, call that function
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with the rest of the line as arguments
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* Parsing and execution are *separate* passes - so you can't use the result
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of a command in an %if statement (or any other control statements)!
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'''
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def __init__(self, fatalerrors=True, templatedir=None, defaults=None, builtins=None):
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self.fatalerrors = fatalerrors
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self.templatedir = templatedir or "/usr/share/lorax"
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self.templatefile = None
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self.builtins = builtins or {}
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self.defaults = defaults or {}
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def run(self, templatefile, **variables):
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for k,v in list(self.defaults.items()) + list(self.builtins.items()):
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variables.setdefault(k,v)
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logger.debug("executing %s with variables=%s", templatefile, variables)
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self.templatefile = templatefile
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t = LoraxTemplate(directories=[self.templatedir])
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commands = t.parse(templatefile, variables)
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self._run(commands)
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def _run(self, parsed_template):
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logger.info("running %s", self.templatefile)
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for (num, line) in enumerate(parsed_template,1):
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logger.debug("template line %i: %s", num, " ".join(line))
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skiperror = False
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(cmd, args) = (line[0], line[1:])
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# Following Makefile convention, if the command is prefixed with
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# a dash ('-'), we'll ignore any errors on that line.
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if cmd.startswith('-'):
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cmd = cmd[1:]
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skiperror = True
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try:
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# grab the method named in cmd and pass it the given arguments
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f = getattr(self, cmd, None)
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if cmd[0] == '_' or cmd == 'run' or not isinstance(f, collections.Callable):
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raise ValueError("unknown command %s" % cmd)
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f(*args)
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except Exception: # pylint: disable=broad-except
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if skiperror:
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logger.debug("ignoring error")
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continue
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logger.error("template command error in %s:", self.templatefile)
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logger.error(" %s", " ".join(line))
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# format the exception traceback
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exclines = traceback.format_exception(*sys.exc_info())
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# skip the bit about "ltmpl.py, in _run()" - we know that
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exclines.pop(1)
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# log the "ErrorType: this is what happened" line
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logger.error(" %s", exclines[-1].strip())
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# and log the entire traceback to the debug log
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for _line in ''.join(exclines).splitlines():
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logger.debug(" %s", _line)
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if self.fatalerrors:
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raise
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# TODO: operate inside an actual chroot for safety? Not that RPM bothers..
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class LoraxTemplateRunner(object):
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class LoraxTemplateRunner(TemplateRunner):
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'''
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This class parses and executes Lorax templates. Sample usage:
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@ -118,18 +193,6 @@ class LoraxTemplateRunner(object):
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NOTES:
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* Parsing procedure is roughly:
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1. Mako template expansion (on the whole file)
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2. For each line of the result,
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a. Whitespace splitting (using shlex.split())
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b. Brace expansion (using brace_expand())
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c. If the first token is the name of a function, call that function
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with the rest of the line as arguments
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* Parsing and execution are *separate* passes - so you can't use the result
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of a command in an %if statement (or any other control statements)!
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* Commands that run external programs (e.g. systemctl) currently use
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the *host*'s copy of that program, which may cause problems if there's a
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big enough difference between the host and the image you're modifying.
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@ -152,14 +215,11 @@ class LoraxTemplateRunner(object):
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self.inroot = inroot
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self.outroot = outroot
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self.dbo = dbo
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self.fatalerrors = fatalerrors
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self.templatedir = templatedir or "/usr/share/lorax"
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self.templatefile = None
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# some builtin methods
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self.builtins = DataHolder(exists=lambda p: rexists(p, root=inroot),
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glob=lambda g: list(rglob(g, root=inroot)))
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self.defaults = defaults or {}
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builtins = DataHolder(exists=lambda p: rexists(p, root=inroot),
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glob=lambda g: list(rglob(g, root=inroot)))
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self.results = DataHolder(treeinfo=dict()) # just treeinfo for now
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super(LoraxTemplateRunner, self).__init__(fatalerrors, templatedir, defaults, builtins)
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# TODO: set up custom logger with a filter to add line info
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def _out(self, path):
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@ -210,51 +270,6 @@ class LoraxTemplateRunner(object):
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for pkg in debug_pkgs:
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f.write("%s\n" % pkg)
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def run(self, templatefile, **variables):
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for k,v in list(self.defaults.items()) + list(self.builtins.items()):
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variables.setdefault(k,v)
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logger.debug("executing %s with variables=%s", templatefile, variables)
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self.templatefile = templatefile
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t = LoraxTemplate(directories=[self.templatedir])
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commands = t.parse(templatefile, variables)
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self._run(commands)
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def _run(self, parsed_template):
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logger.info("running %s", self.templatefile)
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for (num, line) in enumerate(parsed_template,1):
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logger.debug("template line %i: %s", num, " ".join(line))
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skiperror = False
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(cmd, args) = (line[0], line[1:])
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# Following Makefile convention, if the command is prefixed with
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# a dash ('-'), we'll ignore any errors on that line.
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if cmd.startswith('-'):
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cmd = cmd[1:]
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skiperror = True
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try:
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# grab the method named in cmd and pass it the given arguments
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f = getattr(self, cmd, None)
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if cmd[0] == '_' or cmd == 'run' or not isinstance(f, collections.Callable):
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raise ValueError("unknown command %s" % cmd)
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f(*args)
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except Exception: # pylint: disable=broad-except
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if skiperror:
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logger.debug("ignoring error")
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continue
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logger.error("template command error in %s:", self.templatefile)
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logger.error(" %s", " ".join(line))
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# format the exception traceback
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exclines = traceback.format_exception(*sys.exc_info())
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# skip the bit about "ltmpl.py, in _run()" - we know that
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exclines.pop(1)
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# log the "ErrorType: this is what happened" line
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logger.error(" %s", exclines[-1].strip())
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# and log the entire traceback to the debug log
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for _line in ''.join(exclines).splitlines():
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logger.debug(" %s", _line)
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if self.fatalerrors:
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raise
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def install(self, srcglob, dest):
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'''
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install SRC DEST
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@ -265,7 +280,7 @@ class LoraxTemplateRunner(object):
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If DEST doesn't exist, SRC will be copied to a file with that name,
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assuming the rest of the path exists.
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This is pretty much like how the 'cp' command works.
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Examples:
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install usr/share/myconfig/grub.conf /boot
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install /usr/share/myconfig/grub.conf.in /boot/grub.conf
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@ -321,7 +336,7 @@ class LoraxTemplateRunner(object):
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'''
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mkdir DIR [DIR ...]
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Create the named DIR(s). Will create leading directories as needed.
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Example:
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mkdir /images
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'''
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@ -335,7 +350,7 @@ class LoraxTemplateRunner(object):
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replace PATTERN REPLACEMENT FILEGLOB [FILEGLOB ...]
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Find-and-replace the given PATTERN (Python-style regex) with the given
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REPLACEMENT string for each of the files listed.
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Example:
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replace @VERSION@ ${product.version} /boot/grub.conf /boot/isolinux.cfg
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'''
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@ -353,9 +368,9 @@ class LoraxTemplateRunner(object):
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Append STRING (followed by a newline character) to FILE.
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Python character escape sequences ('\\n', '\\t', etc.) will be
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converted to the appropriate characters.
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Examples:
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append /etc/depmod.d/dd.conf "search updates built-in"
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append /etc/resolv.conf ""
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'''
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@ -368,7 +383,7 @@ class LoraxTemplateRunner(object):
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Add an item to the treeinfo data store.
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The given SECTION will have a new item added where
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KEY = ARG ARG ...
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Example:
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treeinfo images-${kernel.arch} boot.iso images/boot.iso
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'''
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@ -469,7 +484,7 @@ class LoraxTemplateRunner(object):
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'''
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log MESSAGE
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Emit the given log message. Be sure to put it in quotes!
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Example:
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log "Reticulating splines, please wait..."
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'''
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@ -588,7 +603,7 @@ class LoraxTemplateRunner(object):
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'''
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removepkg PKGGLOB [PKGGLOB...]
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Delete the named package(s).
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IMPLEMENTATION NOTES:
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RPM scriptlets (%preun/%postun) are *not* run.
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Files are deleted, but directories are left behind.
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@ -653,7 +668,7 @@ class LoraxTemplateRunner(object):
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(or packages) named.
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If '--allbut' is used, all the files from the given package(s) will
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be removed *except* the ones which match the file globs.
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Examples:
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removefrom usbutils /usr/bin/*
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removefrom xfsprogs --allbut /sbin/*
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@ -748,7 +763,7 @@ class LoraxTemplateRunner(object):
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'''
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createaddrsize INITRD_ADDRESS INITRD ADDRSIZE
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Create the initrd.addrsize file required in LPAR boot process.
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Examples:
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createaddrsize ${INITRD_ADDRESS} ${outroot}/${BOOTDIR}/initrd.img ${outroot}/${BOOTDIR}/initrd.addrsize
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'''
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@ -761,7 +776,7 @@ class LoraxTemplateRunner(object):
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'''
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systemctl [enable|disable|mask] UNIT [UNIT...]
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Enable, disable, or mask the given systemd units.
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Examples:
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systemctl disable lvm2-monitor.service
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systemctl mask fedora-storage-init.service fedora-configure.service
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