forked from josch/mmdebstrap
tarfilter: add --type-exclude option
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21366f76b7
commit
199e577757
1 changed files with 56 additions and 6 deletions
62
tarfilter
62
tarfilter
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@ -43,6 +43,29 @@ class PaxFilterAction(argparse.Action):
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setattr(namespace, "paxfilter", items)
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class TypeFilterAction(argparse.Action):
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def __call__(self, parser, namespace, values, option_string=None):
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items = getattr(namespace, "typefilter", [])
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match values:
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case "REGTYPE" | "0":
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items.append(tarfile.REGTYPE)
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case "LNKTYPE" | "1":
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items.append(tarfile.LNKTYPE)
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case "SYMTYPE" | "2":
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items.append(tarfile.SYMTYPE)
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case "CHRTYPE" | "3":
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items.append(tarfile.CHRTYPE)
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case "BLKTYPE" | "4":
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items.append(tarfile.BLKTYPE)
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case "DIRTYPE" | "5":
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items.append(tarfile.DIRTYPE)
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case "FIFOTYPE" | "6":
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items.append(tarfile.FIFOTYPE)
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case _:
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raise ValueError("invalid type: %s" % values)
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setattr(namespace, "typefilter", items)
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class TransformAction(argparse.Action):
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def __call__(self, parser, namespace, values, option_string=None):
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items = getattr(namespace, "trans", [])
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@ -89,10 +112,11 @@ dpkg(1) for information on how these two options work in detail. To reuse the
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exact same semantics as used by dpkg, paths must be given as /path and not as
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./path even though they might be stored as such in the tarball.
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Secondly, filter out unwanted pax extended headers. This is useful in cases
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where a tool only accepts certain xattr prefixes. For example tar2sqfs only
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supports SCHILY.xattr.user.*, SCHILY.xattr.trusted.* and
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SCHILY.xattr.security.* but not SCHILY.xattr.system.posix_acl_default.*.
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Secondly, filter out unwanted pax extended headers using --pax-exclude and
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--pax-include. This is useful in cases where a tool only accepts certain xattr
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prefixes. For example tar2sqfs only supports SCHILY.xattr.user.*,
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SCHILY.xattr.trusted.* and SCHILY.xattr.security.* but not
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SCHILY.xattr.system.posix_acl_default.*.
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Both types of options use Unix shell-style wildcards:
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@ -101,10 +125,16 @@ Both types of options use Unix shell-style wildcards:
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[seq] matches any character in seq
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[!seq] matches any character not in seq
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Thirdly, transform the path of tar members using a sed expression just as with
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Thirdly, filter out files matching a specific tar archive member type using
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--type-exclude. Valid type names are REGTYPE (regular file), LNKTYPE
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(hardlink), SYMTYPE (symlink), CHRTYPE (character special), BLKTYPE (block
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special), DIRTYPE (directory), FIFOTYPE (fifo) or their tar format flag value
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(0-6, respectively).
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Fourthly, transform the path of tar members using a sed expression just as with
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GNU tar --transform.
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Fourthly, strip leading directory components off of tar members. Just as with
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Fifthly, strip leading directory components off of tar members. Just as with
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GNU tar --strip-components, tar members that have less or equal components in
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their path are not passed through.
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@ -140,6 +170,15 @@ Lastly, shift user id and group id of each entry by the value given by the
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help="Re-include a pax header after a previous exclusion. "
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"This option can be specified multiple times.",
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)
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parser.add_argument(
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"--type-exclude",
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metavar="type",
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action=TypeFilterAction,
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help="Exclude certain member types by their type. Choose types either "
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"by their name (REGTYPE, LNKTYPE, SYMTYPE, CHRTYPE, BLKTYPE, DIRTYPE, "
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"FIFOTYPE) or by their tar format flag values (0-6, respectively). "
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"This option can be specified multiple times.",
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)
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parser.add_argument(
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"--transform",
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"--xform",
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@ -164,6 +203,7 @@ Lastly, shift user id and group id of each entry by the value given by the
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if (
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not hasattr(args, "pathfilter")
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and not hasattr(args, "paxfilter")
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and not hasattr(args, "typefilter")
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and not hasattr(args, "strip_components")
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):
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from shutil import copyfileobj
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@ -207,6 +247,14 @@ Lastly, shift user id and group id of each entry by the value given by the
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skip = True
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return skip
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def type_filter_should_skip(member):
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if not hasattr(args, "typefilter"):
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return False
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for t in args.typefilter:
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if member.type == t:
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return True
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return False
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# starting with Python 3.8, the default format became PAX_FORMAT but we
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# are still explicit here in case of future changes.
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with tarfile.open(fileobj=sys.stdin.buffer, mode="r|*") as in_tar, tarfile.open(
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@ -215,6 +263,8 @@ Lastly, shift user id and group id of each entry by the value given by the
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for member in in_tar:
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if path_filter_should_skip(member):
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continue
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if type_filter_should_skip(member):
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continue
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if args.strip_components:
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comps = member.name.split("/")
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# just as with GNU tar, archive members with less or equal
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