mirror of
https://github.com/git/git.git
synced 2024-05-24 00:16:31 +02:00
Support RFC 2822 date parsing in fast-import.
Since some frontends may be working with source material where the dates are only readily available as RFC 2822 strings, it is more friendly if fast-import exposes Git's parse_date() function to handle the conversion. This way the frontend doesn't need to perform the parsing itself. The new --date-format option to fast-import can be used by a frontend to select which format it will supply date strings in. The default is the standard `raw` Git format, which fast-import has always supported. Format rfc2822 can be used to activate the parse_date() function instead. Because fast-import could also be useful for creating new, current commits, the format `now` is also supported to generate the current system timestamp. The implementation of `now` is a trivial call to datestamp(), but is actually a whole whopping 3 lines so that fast-import can verify the frontend really meant `now`. As part of this change I have added validation of the `raw` date format. Prior to this change fast-import would accept anything in a `committer` command, even if it was seriously malformed. Now fast-import requires the '> ' near the end of the string and verifies the timestamp is formatted properly. Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This commit is contained in:
Shawn O. Pearce
parent
ef94edb53c
commit
63e0c8b364
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@ -32,6 +32,12 @@ the frontend program in use.
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OPTIONS
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-------
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--date-format=<fmt>::
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Specify the type of dates the frontend will supply to
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gfi within `author`, `committer` and `tagger` commands.
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See ``Date Formats'' below for details about which formats
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are supported, and their syntax.
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--max-pack-size=<n>::
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Maximum size of each output packfile, expressed in MiB.
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The default is 4096 (4 GiB) as that is the maximum allowed
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@ -53,7 +59,6 @@ OPTIONS
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Frontends can use this file to validate imports after they
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have been completed.
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Performance
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-----------
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The design of gfi allows it to import large projects in a minimum
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@ -127,6 +132,78 @@ results, such as branch names or file names with leading or trailing
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spaces in their name, or early termination of gfi when it encounters
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unexpected input.
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Date Formats
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~~~~~~~~~~~~
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The following date formats are supported. A frontend should select
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the format it will use for this import by passing the format name
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in the `--date-format=<fmt>` command line option.
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`raw`::
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This is the Git native format and is `<time> SP <tz>`.
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It is also gfi's default format, if `--date-format` was
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not specified.
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+
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The time of the event is specified by `<time>` as the number of
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seconds since the UNIX epoch (midnight, Jan 1, 1970, UTC) and is
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written as an ASCII decimal integer.
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+
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The timezone is specified by `<tz>` as a positive or negative offset
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from UTC. For example EST (which is typically 5 hours behind GMT)
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would be expressed in `<tz>` by ``-0500'' while GMT is ``+0000''.
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+
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If the timezone is not available in the source material, use
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``+0000'', or the most common local timezone. For example many
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organizations have a CVS repository which has only ever been accessed
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by users who are located in the same location and timezone. In this
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case the user's timezone can be easily assumed.
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+
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Unlike the `rfc2822` format, this format is very strict. Any
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variation in formatting will cause gfi to reject the value.
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`rfc2822`::
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This is the standard email format as described by RFC 2822.
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+
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An example value is ``Tue Feb 6 11:22:18 2007 -0500''. The Git
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parser is accurate, but a little on the lenient side. Its the
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same parser used by gitlink:git-am[1] when applying patches
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received from email.
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+
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Some malformed strings may be accepted as valid dates. In some of
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these cases Git will still be able to obtain the correct date from
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the malformed string. There are also some types of malformed
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strings which Git will parse wrong, and yet consider valid.
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Seriously malformed strings will be rejected.
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+
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If the source material is formatted in RFC 2822 style dates,
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the frontend should let gfi handle the parsing and conversion
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(rather than attempting to do it itself) as the Git parser has
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been well tested in the wild.
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+
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Frontends should prefer the `raw` format if the source material
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is already in UNIX-epoch format, or is easily convertible to
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that format, as there is no ambiguity in parsing.
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`now`::
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Always use the current time and timezone. The literal
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`now` must always be supplied for `<when>`.
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+
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This is a toy format. The current time and timezone of this system
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is always copied into the identity string at the time it is being
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created by gfi. There is no way to specify a different time or
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timezone.
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+
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This particular format is supplied as its short to implement and
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may be useful to a process that wants to create a new commit
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right now, without needing to use a working directory or
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gitlink:git-update-index[1].
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+
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If separate `author` and `committer` commands are used in a `commit`
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the timestamps may not match, as the system clock will be polled
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twice (once for each command). The only way to ensure that both
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author and committer identity information has the same timestamp
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is to omit `author` (thus copying from `committer`) or to use a
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date format other than `now`.
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Commands
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~~~~~~~~
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gfi accepts several commands to update the current repository
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@ -168,8 +245,8 @@ change to the project.
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....
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'commit' SP <ref> LF
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mark?
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('author' SP <name> SP LT <email> GT SP <time> SP <tz> LF)?
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'committer' SP <name> SP LT <email> GT SP <time> SP <tz> LF
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('author' SP <name> SP LT <email> GT SP <when> LF)?
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'committer' SP <name> SP LT <email> GT SP <when> LF
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data
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('from' SP <committish> LF)?
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('merge' SP <committish> LF)?
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@ -222,12 +299,10 @@ the email address from the other fields in the line. Note that
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`<name>` is free-form and may contain any sequence of bytes, except
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`LT` and `LF`. It is typically UTF-8 encoded.
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The time of the change is specified by `<time>` as the number of
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seconds since the UNIX epoc (midnight, Jan 1, 1970, UTC) and is
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written as an ASCII decimal integer. The committer's
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timezone is specified by `<tz>` as a positive or negative offset
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from UTC. For example EST (which is typically 5 hours behind GMT)
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would be expressed in `<tz>` by ``-0500'' while GMT is ``+0000''.
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The time of the change is specified by `<when>` using the date format
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that was selected by the `--date-format=<fmt>` command line option.
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See ``Date Formats'' above for the set of supported formats, and
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their syntax.
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`from`
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^^^^^^
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@ -394,7 +469,7 @@ lightweight (non-annotated) tags see the `reset` command below.
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....
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'tag' SP <name> LF
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'from' SP <committish> LF
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'tagger' SP <name> SP LT <email> GT SP <time> SP <tz> LF
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'tagger' SP <name> SP LT <email> GT SP <when> LF
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data
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LF
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....
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107
fast-import.c
107
fast-import.c
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@ -17,8 +17,8 @@ Format of STDIN stream:
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new_commit ::= 'commit' sp ref_str lf
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mark?
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('author' sp name '<' email '>' ts tz lf)?
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'committer' sp name '<' email '>' ts tz lf
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('author' sp name '<' email '>' when lf)?
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'committer' sp name '<' email '>' when lf
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commit_msg
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('from' sp (ref_str | hexsha1 | sha1exp_str | idnum) lf)?
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('merge' sp (ref_str | hexsha1 | sha1exp_str | idnum) lf)*
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@ -34,7 +34,7 @@ Format of STDIN stream:
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new_tag ::= 'tag' sp tag_str lf
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'from' sp (ref_str | hexsha1 | sha1exp_str | idnum) lf
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'tagger' sp name '<' email '>' ts tz lf
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'tagger' sp name '<' email '>' when lf
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tag_msg;
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tag_msg ::= data;
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@ -88,6 +88,10 @@ Format of STDIN stream:
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bigint ::= # unsigned integer value, ascii base10 notation;
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binary_data ::= # file content, not interpreted;
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when ::= raw_when | rfc2822_when;
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raw_when ::= ts sp tz;
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rfc2822_when ::= # Valid RFC 2822 date and time;
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sp ::= # ASCII space character;
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lf ::= # ASCII newline (LF) character;
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@ -234,6 +238,12 @@ struct hash_list
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unsigned char sha1[20];
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};
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typedef enum {
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WHENSPEC_RAW = 1,
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WHENSPEC_RFC2822,
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WHENSPEC_NOW,
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} whenspec_type;
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/* Configured limits on output */
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static unsigned long max_depth = 10;
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static unsigned long max_packsize = (1LL << 32) - 1;
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@ -294,6 +304,7 @@ static struct tag *first_tag;
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static struct tag *last_tag;
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/* Input stream parsing */
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static whenspec_type whenspec = WHENSPEC_RAW;
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static struct strbuf command_buf;
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static uintmax_t next_mark;
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static struct dbuf new_data;
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@ -1396,6 +1407,64 @@ static void *cmd_data (size_t *size)
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return buffer;
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}
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static int validate_raw_date(const char *src, char *result, int maxlen)
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{
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const char *orig_src = src;
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char *endp, sign;
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strtoul(src, &endp, 10);
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if (endp == src || *endp != ' ')
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return -1;
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src = endp + 1;
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if (*src != '-' && *src != '+')
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return -1;
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sign = *src;
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strtoul(src + 1, &endp, 10);
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if (endp == src || *endp || (endp - orig_src) >= maxlen)
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return -1;
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strcpy(result, orig_src);
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return 0;
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}
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static char *parse_ident(const char *buf)
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{
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const char *gt;
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size_t name_len;
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char *ident;
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gt = strrchr(buf, '>');
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if (!gt)
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die("Missing > in ident string: %s", buf);
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gt++;
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if (*gt != ' ')
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die("Missing space after > in ident string: %s", buf);
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gt++;
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name_len = gt - buf;
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ident = xmalloc(name_len + 24);
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strncpy(ident, buf, name_len);
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switch (whenspec) {
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case WHENSPEC_RAW:
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if (validate_raw_date(gt, ident + name_len, 24) < 0)
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die("Invalid raw date \"%s\" in ident: %s", gt, buf);
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break;
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case WHENSPEC_RFC2822:
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if (parse_date(gt, ident + name_len, 24) < 0)
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die("Invalid rfc2822 date \"%s\" in ident: %s", gt, buf);
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break;
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case WHENSPEC_NOW:
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if (strcmp("now", gt))
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die("Date in ident must be 'now': %s", buf);
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datestamp(ident + name_len, 24);
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break;
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}
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return ident;
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}
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static void cmd_new_blob(void)
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{
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size_t l;
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@ -1655,11 +1724,11 @@ static void cmd_new_commit(void)
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read_next_command();
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cmd_mark();
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if (!strncmp("author ", command_buf.buf, 7)) {
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author = strdup(command_buf.buf);
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author = parse_ident(command_buf.buf + 7);
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read_next_command();
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}
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if (!strncmp("committer ", command_buf.buf, 10)) {
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committer = strdup(command_buf.buf);
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committer = parse_ident(command_buf.buf + 10);
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read_next_command();
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}
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if (!committer)
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@ -1692,7 +1761,7 @@ static void cmd_new_commit(void)
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store_tree(&b->branch_tree);
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hashcpy(b->branch_tree.versions[0].sha1,
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b->branch_tree.versions[1].sha1);
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size_dbuf(&new_data, 97 + msglen
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size_dbuf(&new_data, 114 + msglen
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+ merge_count * 49
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+ (author
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? strlen(author) + strlen(committer)
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@ -1708,11 +1777,9 @@ static void cmd_new_commit(void)
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free(merge_list);
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merge_list = next;
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}
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if (author)
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sp += sprintf(sp, "%s\n", author);
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else
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sp += sprintf(sp, "author %s\n", committer + 10);
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sp += sprintf(sp, "%s\n\n", committer);
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sp += sprintf(sp, "author %s\n", author ? author : committer);
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sp += sprintf(sp, "committer %s\n", committer);
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*sp++ = '\n';
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memcpy(sp, msg, msglen);
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sp += msglen;
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free(author);
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@ -1780,7 +1847,7 @@ static void cmd_new_tag(void)
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/* tagger ... */
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if (strncmp("tagger ", command_buf.buf, 7))
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die("Expected tagger command, got %s", command_buf.buf);
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tagger = strdup(command_buf.buf);
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tagger = parse_ident(command_buf.buf + 7);
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/* tag payload/message */
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read_next_command();
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@ -1792,7 +1859,8 @@ static void cmd_new_tag(void)
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sp += sprintf(sp, "object %s\n", sha1_to_hex(sha1));
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sp += sprintf(sp, "type %s\n", type_names[OBJ_COMMIT]);
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sp += sprintf(sp, "tag %s\n", t->name);
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sp += sprintf(sp, "%s\n\n", tagger);
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sp += sprintf(sp, "tagger %s\n", tagger);
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*sp++ = '\n';
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memcpy(sp, msg, msglen);
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sp += msglen;
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free(tagger);
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@ -1835,7 +1903,7 @@ static void cmd_checkpoint(void)
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}
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static const char fast_import_usage[] =
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"git-fast-import [--depth=n] [--active-branches=n] [--export-marks=marks.file] [--branch-log=log]";
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"git-fast-import [--date-format=f] [--max-pack-size=n] [--depth=n] [--active-branches=n] [--export-marks=marks.file]";
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int main(int argc, const char **argv)
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{
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@ -1849,6 +1917,17 @@ int main(int argc, const char **argv)
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if (*a != '-' || !strcmp(a, "--"))
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break;
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else if (!strncmp(a, "--date-format=", 14)) {
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const char *fmt = a + 14;
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if (!strcmp(fmt, "raw"))
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whenspec = WHENSPEC_RAW;
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else if (!strcmp(fmt, "rfc2822"))
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whenspec = WHENSPEC_RFC2822;
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else if (!strcmp(fmt, "now"))
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whenspec = WHENSPEC_NOW;
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else
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die("unknown --date-format argument %s", fmt);
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}
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else if (!strncmp(a, "--max-pack-size=", 16))
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max_packsize = strtoumax(a + 16, NULL, 0) * 1024 * 1024;
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else if (!strncmp(a, "--depth=", 8))
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@ -240,4 +240,40 @@ test_expect_success \
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'git-cat-file blob branch:newdir/exec.sh >actual &&
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diff -u expect actual'
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###
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### series E
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###
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cat >input <<INPUT_END
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commit refs/heads/branch
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author $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> Tue Feb 6 11:22:18 2007 -0500
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committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> Tue Feb 6 12:35:02 2007 -0500
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data <<COMMIT
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RFC 2822 type date
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COMMIT
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from refs/heads/branch^0
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INPUT_END
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test_expect_failure \
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'E: rfc2822 date, --date-format=raw' \
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'git-fast-import --date-format=raw <input'
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test_expect_success \
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'E: rfc2822 date, --date-format=rfc2822' \
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'git-fast-import --date-format=rfc2822 <input'
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test_expect_success \
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'E: verify pack' \
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'for p in .git/objects/pack/*.pack;do git-verify-pack $p||exit;done'
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cat >expect <<EOF
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author $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL> 1170778938 -0500
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committer $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL> 1170783302 -0500
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RFC 2822 type date
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EOF
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test_expect_success \
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'E: verify commit' \
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'git-cat-file commit branch | sed 1,2d >actual &&
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diff -u expect actual'
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test_done
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