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acf9de4c94
Change the validation logic in "mktag" to use fsck's fsck_tag()
instead of its own custom parser. Curiously the logic for both dates
back to the same commit[1]. Let's unify them so we're not maintaining
two sets functions to verify that a tag is OK.
The behavior of fsck_tag() and the old "mktag" code being removed here
is different in few aspects.
I think it makes sense to remove some of those checks, namely:
A. fsck only cares that the timezone matches [-+][0-9]{4}. The mktag
code disallowed values larger than 1400.
Yes there's currently no timezone with a greater offset[2], but
since we allow any number of non-offical timezones (e.g. +1234)
passing this through seems fine. Git also won't break in the
future if e.g. French Polynesia decides it needs to outdo the Line
Islands when it comes to timezone extravagance.
B. fsck allows missing author names such as "tagger <email>", mktag
wouldn't, but would allow e.g. "tagger [2 spaces] <email>" (but
not "tagger [1 space] <email>"). Now we allow all of these.
C. Like B, but "mktag" disallowed spaces in the <email> part, fsck
allows it.
In some ways fsck_tag() is stricter than "mktag" was, namely:
D. fsck disallows zero-padded dates, but mktag didn't care. So
e.g. the timestamp "0000000000 +0000" produces an error now. A
test in "t1006-cat-file.sh" relied on this, it's been changed to
use "hash-object" (without fsck) instead.
There was one check I deemed worth keeping by porting it over to
fsck_tag():
E. "mktag" did not allow any custom headers, and by extension (as an
empty commit is allowed) also forbade an extra stray trailing
newline after the headers it knew about.
Add a new check in the "ignore" category to fsck and use it. This
somewhat abuses the facility added in efaba7cc77 (fsck:
optionally ignore specific fsck issues completely, 2015-06-22).
This is somewhat of hack, but probably the least invasive change
we can make here. The fsck command will shuffle these categories
around, e.g. under --strict the "info" becomes a "warn" and "warn"
becomes "error". Existing users of fsck's (and others,
e.g. index-pack) --strict option rely on this.
So we need to put something into a category that'll be ignored by
all existing users of the API. Pretending that
fsck.extraHeaderEntry=error ("ignore" by default) was set serves
to do this for us.
1. ec4465adb3 (Add "tag" objects that can be used to sign other
objects., 2005-04-25)
2. https://en.wikipedia.org/wiki/List_of_UTC_time_offsets
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
#include "builtin.h"
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#include "tag.h"
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#include "replace-object.h"
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#include "object-store.h"
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#include "fsck.h"
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static int mktag_fsck_error_func(struct fsck_options *o,
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const struct object_id *oid,
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enum object_type object_type,
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int msg_type, const char *message)
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{
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switch (msg_type) {
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case FSCK_WARN:
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case FSCK_ERROR:
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/*
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* We treat both warnings and errors as errors, things
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* like missing "tagger" lines are "only" warnings
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* under fsck, we've always considered them an error.
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*/
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fprintf_ln(stderr, "error: tag input does not pass fsck: %s", message);
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return 1;
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default:
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BUG("%d (FSCK_IGNORE?) should never trigger this callback",
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msg_type);
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}
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}
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static int verify_object_in_tag(struct object_id *tagged_oid, int *tagged_type)
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{
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int ret;
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enum object_type type;
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unsigned long size;
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void *buffer;
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const struct object_id *repl;
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buffer = read_object_file(tagged_oid, &type, &size);
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if (!buffer)
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die("could not read tagged object '%s'",
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oid_to_hex(tagged_oid));
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if (type != *tagged_type)
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die("object '%s' tagged as '%s', but is a '%s' type",
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oid_to_hex(tagged_oid),
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type_name(*tagged_type), type_name(type));
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repl = lookup_replace_object(the_repository, tagged_oid);
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ret = check_object_signature(the_repository, repl,
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buffer, size, type_name(*tagged_type));
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free(buffer);
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return ret;
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}
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int cmd_mktag(int argc, const char **argv, const char *prefix)
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{
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struct strbuf buf = STRBUF_INIT;
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struct fsck_options fsck_options = FSCK_OPTIONS_STRICT;
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struct object_id tagged_oid;
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int tagged_type;
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struct object_id result;
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if (argc != 1)
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usage("git mktag");
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if (strbuf_read(&buf, 0, 0) < 0)
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die_errno("could not read from stdin");
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fsck_options.error_func = mktag_fsck_error_func;
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fsck_set_msg_type(&fsck_options, "extraheaderentry", "warn");
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if (fsck_tag_standalone(NULL, buf.buf, buf.len, &fsck_options,
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&tagged_oid, &tagged_type))
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die("tag on stdin did not pass our strict fsck check");
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if (verify_object_in_tag(&tagged_oid, &tagged_type))
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die("tag on stdin did not refer to a valid object");
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if (write_object_file(buf.buf, buf.len, tag_type, &result) < 0)
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die("unable to write tag file");
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strbuf_release(&buf);
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puts(oid_to_hex(&result));
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return 0;
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}
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