mirror of
https://github.com/git/git.git
synced 2024-05-28 18:36:46 +02:00
Converted fast-import to a text based protocol.
Frontend clients can now send a text stream to fast-import rather than a binary stream. This should facilitate developing frontend software as the data stream is easier to view, manipulate and debug my hand and Mark-I eyeball. Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This commit is contained in:
Shawn O. Pearce
parent
7111feede9
commit
c44cdc7eef
470
fast-import.c
470
fast-import.c
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@ -4,57 +4,93 @@ Format of STDIN stream:
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stream ::= cmd*;
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cmd ::= new_blob
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| new_commit
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| new_branch
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| new_commit
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| new_tag
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;
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new_blob ::= 'blob' blob_data;
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new_blob ::= 'blob' lf
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mark?
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file_content;
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file_content ::= data;
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new_commit ::= 'comt' ref_name author_committer_msg
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new_branch ::= 'branch' sp ref_str lf
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('from' sp (ref_str | hexsha1 | sha1exp_str | idnum) lf)?
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lf;
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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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commit_msg
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file_change*
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'0';
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lf;
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commit_msg ::= data;
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new_branch ::= 'brch' dst_ref_name src_ref_name;
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dst_ref_name ::= ref_name;
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src_ref_name ::= ref_name | sha1_exp;
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new_tag ::= 'tagg' ref_name tag_name tagger_msg;
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file_change ::= 'M' path_name hexsha1
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| 'D' path_name
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file_change ::= 'M' sp mode sp (hexsha1 | idnum) sp path_str lf
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| 'D' sp path_str lf
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;
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mode ::= '644' | '755';
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author_committer_msg ::= len32
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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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lf
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binary_data;
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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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tag_msg;
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tag_msg ::= data;
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tagger_msg ::= len32
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'tagger' sp name '<' email '>' ts tz lf
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lf
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binary_data;
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# note: the first idnum in a stream should be 1 and subsequent
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# idnums should not have gaps between values as this will cause
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# the stream parser to reserve space for the gapped values. An
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# idnum can be updated in the future to a new object by issuing
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# a new mark directive with the old idnum.
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#
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mark ::= 'mark' sp idnum lf;
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blob_data ::= len32 binary_data; # max len is 2^32-1
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path_name ::= len32 path; # max len is PATH_MAX-1
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ref_name ::= len32 ref; # max len is PATH_MAX-1
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tag_name ::= len32 tag; # max len is PATH_MAX-1
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sha1_exp ::= len32 sha1exp; # max len is PATH_MAX-1
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# note: declen indicates the length of binary_data in bytes.
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# declen does not include the lf preceeding or trailing the
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# binary data.
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#
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data ::= 'data' sp declen lf
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binary_data
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lf;
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len32 ::= # unsigned 32 bit value, native format;
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# note: quoted strings are C-style quoting supporting \c for
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# common escapes of 'c' (e..g \n, \t, \\, \") or \nnn where nnn
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# is the signed byte value in octal. Note that the only
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# characters which must actually be escaped to protect the
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# stream formatting is: \, " and LF. Otherwise these values
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# are UTF8.
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#
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ref_str ::= ref | '"' quoted(ref) '"' ;
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sha1exp_str ::= sha1exp | '"' quoted(sha1exp) '"' ;
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tag_str ::= tag | '"' quoted(tag) '"' ;
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path_str ::= path | '"' quoted(path) '"' ;
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declen ::= # unsigned 32 bit value, ascii base10 notation;
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binary_data ::= # file content, not interpreted;
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sp ::= # ASCII space character;
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lf ::= # ASCII newline (LF) character;
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path ::= # GIT style file path, e.g. "a/b/c";
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ref ::= # GIT ref name, e.g. "refs/heads/MOZ_GECKO_EXPERIMENT";
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tag ::= # GIT tag name, e.g. "FIREFOX_1_5";
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# note: a colon (':') must precede the numerical value assigned to
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# an idnum. This is to distinguish it from a ref or tag name as
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# GIT does not permit ':' in ref or tag strings.
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#
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idnum ::= ':' declen;
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path ::= # GIT style file path, e.g. "a/b/c";
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ref ::= # GIT ref name, e.g. "refs/heads/MOZ_GECKO_EXPERIMENT";
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tag ::= # GIT tag name, e.g. "FIREFOX_1_5";
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sha1exp ::= # Any valid GIT SHA1 expression;
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hexsha1 ::= # SHA1 in hexadecimal format;
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name ::= # valid GIT author/committer name;
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# note: name and email are UTF8 strings, however name must not
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# contain '<' or lf and email must not contain any of the
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# following: '<', '>', lf.
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#
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name ::= # valid GIT author/committer name;
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email ::= # valid GIT author/committer email;
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ts ::= # time since the epoch in seconds, ascii decimal;
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tz ::= # GIT style timezone;
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ts ::= # time since the epoch in seconds, ascii base10 notation;
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tz ::= # GIT style timezone;
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*/
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#include "builtin.h"
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@ -66,6 +102,8 @@ Format of STDIN stream:
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#include "pack.h"
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#include "refs.h"
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#include "csum-file.h"
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#include "strbuf.h"
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#include "quote.h"
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struct object_entry
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{
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@ -153,7 +191,7 @@ static size_t mem_pool_alloc = 2*1024*1024 - sizeof(struct mem_pool);
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static size_t total_allocd;
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static struct mem_pool *mem_pool;
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/* atom management */
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/* Atom management */
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static unsigned int atom_table_sz = 4451;
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static unsigned int atom_cnt;
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static struct atom_str **atom_table;
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@ -184,6 +222,10 @@ static unsigned int branch_table_sz = 1039;
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static struct branch **branch_table;
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static struct branch *active_branches;
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/* Input stream parsing */
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static struct strbuf command_buf;
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static unsigned long command_mark;
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static void alloc_objects(int cnt)
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{
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@ -330,6 +372,8 @@ static struct branch* new_branch(const char *name)
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if (b)
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die("Invalid attempt to create duplicate branch: %s", name);
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if (check_ref_format(name))
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die("Branch name doesn't conform to GIT standards: %s", name);
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b = pool_calloc(1, sizeof(struct branch));
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b->name = pool_strdup(name);
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@ -433,22 +477,6 @@ static void yread(int fd, void *buffer, size_t length)
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}
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}
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static int optional_read(int fd, void *buffer, size_t length)
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{
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ssize_t ret = 0;
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while (ret < length) {
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ssize_t size = xread(fd, (char *) buffer + ret, length - ret);
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if (!size && !ret)
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return 1;
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if (!size)
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die("Read from descriptor %i: end of stream", fd);
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if (size < 0)
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die("Read from descriptor %i: %s", fd, strerror(errno));
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ret += size;
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}
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return 0;
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}
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static void ywrite(int fd, void *buffer, size_t length)
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{
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ssize_t ret = 0;
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@ -462,24 +490,9 @@ static void ywrite(int fd, void *buffer, size_t length)
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}
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}
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static const char* read_path()
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{
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static char sn[PATH_MAX];
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unsigned long slen;
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yread(0, &slen, 4);
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if (!slen)
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die("Expected string command parameter, didn't find one");
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if (slen > (PATH_MAX - 1))
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die("Can't handle excessive string length %lu", slen);
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yread(0, sn, slen);
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sn[slen] = 0;
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return sn;
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}
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static unsigned long encode_header(
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static size_t encode_header(
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enum object_type type,
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unsigned long size,
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size_t size,
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unsigned char *hdr)
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{
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int n = 1;
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@ -503,7 +516,7 @@ static unsigned long encode_header(
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static int store_object(
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enum object_type type,
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void *dat,
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unsigned long datlen,
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size_t datlen,
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struct last_object *last,
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unsigned char *sha1out)
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{
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@ -896,15 +909,57 @@ static void dump_branches()
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}
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}
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static void read_next_command()
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{
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read_line(&command_buf, stdin, '\n');
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}
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static void cmd_mark()
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{
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if (!strncmp("mark :", command_buf.buf, 6)) {
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command_mark = strtoul(command_buf.buf + 6, NULL, 10);
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read_next_command();
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}
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else
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command_mark = 0;
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}
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static void* cmd_data (size_t *size)
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{
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size_t n = 0;
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void *buffer;
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size_t length;
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if (strncmp("data ", command_buf.buf, 5))
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die("Expected 'data n' command, found: %s", command_buf.buf);
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length = strtoul(command_buf.buf + 5, NULL, 10);
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buffer = xmalloc(length);
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while (n < length) {
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size_t s = fread((char*)buffer + n, 1, length - n, stdin);
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if (!s && feof(stdin))
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die("EOF in data (%lu bytes remaining)", length - n);
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n += s;
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}
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if (fgetc(stdin) != '\n')
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die("An lf did not trail the binary data as expected.");
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*size = length;
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return buffer;
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}
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static void cmd_new_blob()
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{
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unsigned long datlen;
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unsigned char sha1[20];
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size_t datlen;
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void *dat;
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unsigned char sha1[20];
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read_next_command();
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cmd_mark();
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dat = cmd_data(&datlen);
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yread(0, &datlen, 4);
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dat = xmalloc(datlen);
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yread(0, dat, datlen);
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if (store_object(OBJ_BLOB, dat, datlen, &last_blob, sha1))
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free(dat);
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}
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@ -949,122 +1004,231 @@ static void load_branch(struct branch *b)
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static void file_change_m(struct branch *b)
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{
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const char *path = read_path();
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const char *p = command_buf.buf + 2;
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char *p_uq;
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const char *endp;
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struct object_entry *oe;
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char hexsha1[41];
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unsigned char sha1[20];
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unsigned int mode;
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char type[20];
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yread(0, hexsha1, 40);
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hexsha1[40] = 0;
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p = get_mode(p, &mode);
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if (!p)
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die("Corrupt mode: %s", command_buf.buf);
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switch (mode) {
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case S_IFREG | 0644:
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case S_IFREG | 0755:
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case 0644:
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case 0755:
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/* ok */
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break;
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default:
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die("Corrupt mode: %s", command_buf.buf);
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}
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if (get_sha1_hex(p, sha1))
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die("Invalid SHA1: %s", command_buf.buf);
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p += 40;
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if (*p++ != ' ')
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die("Missing space after SHA1: %s", command_buf.buf);
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p_uq = unquote_c_style(p, &endp);
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if (p_uq) {
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if (*endp)
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die("Garbage after path in: %s", command_buf.buf);
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p = p_uq;
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}
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if (get_sha1_hex(hexsha1, sha1))
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die("Invalid sha1 %s for %s", hexsha1, path);
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oe = find_object(sha1);
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if (oe) {
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if (oe->type != OBJ_BLOB)
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die("%s is a %s not a blob (for %s)", hexsha1, type_names[oe->type], path);
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die("Not a blob (actually a %s): %s",
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command_buf.buf, type_names[oe->type]);
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} else {
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if (sha1_object_info(sha1, type, NULL))
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die("No blob %s for %s", hexsha1, path);
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die("Blob not found: %s", command_buf.buf);
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if (strcmp(blob_type, type))
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die("%s is a %s not a blob (for %s)", hexsha1, type, path);
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die("Not a blob (actually a %s): %s",
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command_buf.buf, type);
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}
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tree_content_set(&b->branch_tree, path, sha1, S_IFREG | 0644);
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tree_content_set(&b->branch_tree, p, sha1, S_IFREG | mode);
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if (p_uq)
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free(p_uq);
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}
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static void file_change_d(struct branch *b)
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{
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tree_content_remove(&b->branch_tree, read_path());
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const char *p = command_buf.buf + 2;
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char *p_uq;
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const char *endp;
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p_uq = unquote_c_style(p, &endp);
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if (p_uq) {
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if (*endp)
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die("Garbage after path in: %s", command_buf.buf);
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p = p_uq;
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}
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tree_content_remove(&b->branch_tree, p);
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if (p_uq)
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free(p_uq);
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}
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static void cmd_new_commit()
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{
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static const unsigned int max_hdr_len = 94;
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const char *name = read_path();
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struct branch *b = lookup_branch(name);
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unsigned int acmsglen;
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char *body, *c;
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struct branch *b;
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void *msg;
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size_t msglen;
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char *str_uq;
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const char *endp;
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char *sp;
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char *author = NULL;
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char *committer = NULL;
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char *body;
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/* Obtain the branch name from the rest of our command */
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sp = strchr(command_buf.buf, ' ') + 1;
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str_uq = unquote_c_style(sp, &endp);
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if (str_uq) {
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if (*endp)
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die("Garbage after ref in: %s", command_buf.buf);
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sp = str_uq;
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}
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b = lookup_branch(sp);
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if (!b)
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die("Branch not declared: %s", name);
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die("Branch not declared: %s", sp);
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if (str_uq)
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free(str_uq);
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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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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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read_next_command();
|
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}
|
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if (!committer)
|
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die("Expected committer but didn't get one");
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msg = cmd_data(&msglen);
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|
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/* ensure the branch is active/loaded */
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||||
if (!b->branch_tree.tree) {
|
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unload_one_branch();
|
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load_branch(b);
|
||||
}
|
||||
|
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/* author_committer_msg */
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yread(0, &acmsglen, 4);
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||||
body = xmalloc(acmsglen + max_hdr_len);
|
||||
c = body + max_hdr_len;
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yread(0, c, acmsglen);
|
||||
|
||||
/* oddly enough this is all that fsck-objects cares about */
|
||||
if (memcmp(c, "author ", 7))
|
||||
die("Invalid commit format on branch %s", name);
|
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|
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/* file_change* */
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for (;;) {
|
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unsigned char cmd;
|
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yread(0, &cmd, 1);
|
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if (cmd == '0')
|
||||
read_next_command();
|
||||
if (1 == command_buf.len)
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break;
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else if (cmd == 'M')
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else if (!strncmp("M ", command_buf.buf, 2))
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file_change_m(b);
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else if (cmd == 'D')
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else if (!strncmp("D ", command_buf.buf, 2))
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file_change_d(b);
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||||
else
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die("Unsupported file_change: %c", cmd);
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die("Unsupported file_change: %s", command_buf.buf);
|
||||
}
|
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|
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if (memcmp(b->sha1, null_sha1, 20)) {
|
||||
sprintf(c - 48, "parent %s", sha1_to_hex(b->sha1));
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||||
*(c - 1) = '\n';
|
||||
c -= 48;
|
||||
}
|
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/* build the tree and the commit */
|
||||
store_tree(&b->branch_tree);
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||||
sprintf(c - 46, "tree %s", sha1_to_hex(b->branch_tree.sha1));
|
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*(c - 1) = '\n';
|
||||
c -= 46;
|
||||
body = xmalloc(97 + msglen
|
||||
+ (author
|
||||
? strlen(author) + strlen(committer)
|
||||
: 2 * strlen(committer)));
|
||||
sp = body;
|
||||
sp += sprintf(sp, "tree %s\n", sha1_to_hex(b->branch_tree.sha1));
|
||||
if (memcmp(b->sha1, null_sha1, 20))
|
||||
sp += sprintf(sp, "parent %s\n", sha1_to_hex(b->sha1));
|
||||
if (author)
|
||||
sp += sprintf(sp, "%s\n", author);
|
||||
else
|
||||
sp += sprintf(sp, "author %s\n", committer + 10);
|
||||
sp += sprintf(sp, "%s\n\n", committer);
|
||||
memcpy(sp, msg, msglen);
|
||||
sp += msglen;
|
||||
if (author)
|
||||
free(author);
|
||||
free(committer);
|
||||
free(msg);
|
||||
|
||||
store_object(OBJ_COMMIT,
|
||||
c, (body + max_hdr_len + acmsglen) - c,
|
||||
NULL, b->sha1);
|
||||
store_object(OBJ_COMMIT, body, sp - body, NULL, b->sha1);
|
||||
free(body);
|
||||
b->last_commit = object_count_by_type[OBJ_COMMIT];
|
||||
}
|
||||
|
||||
static void cmd_new_branch()
|
||||
{
|
||||
struct branch *b = new_branch(read_path());
|
||||
const char *base = read_path();
|
||||
struct branch *s = lookup_branch(base);
|
||||
struct branch *b;
|
||||
char *str_uq;
|
||||
const char *endp;
|
||||
char *sp;
|
||||
|
||||
if (!strcmp(b->name, base))
|
||||
die("Can't create a branch from itself: %s", base);
|
||||
else if (s) {
|
||||
memcpy(b->sha1, s->sha1, 20);
|
||||
memcpy(b->branch_tree.sha1, s->branch_tree.sha1, 20);
|
||||
/* Obtain the new branch name from the rest of our command */
|
||||
sp = strchr(command_buf.buf, ' ') + 1;
|
||||
str_uq = unquote_c_style(sp, &endp);
|
||||
if (str_uq) {
|
||||
if (*endp)
|
||||
die("Garbage after ref in: %s", command_buf.buf);
|
||||
sp = str_uq;
|
||||
}
|
||||
else if (!get_sha1(base, b->sha1)) {
|
||||
if (!memcmp(b->sha1, null_sha1, 20))
|
||||
memcpy(b->branch_tree.sha1, null_sha1, 20);
|
||||
else {
|
||||
unsigned long size;
|
||||
char *buf;
|
||||
b = new_branch(sp);
|
||||
if (str_uq)
|
||||
free(str_uq);
|
||||
read_next_command();
|
||||
|
||||
buf = read_object_with_reference(b->sha1,
|
||||
type_names[OBJ_COMMIT], &size, b->sha1);
|
||||
if (!buf || size < 46)
|
||||
die("Not a valid commit: %s", base);
|
||||
if (memcmp("tree ", buf, 5)
|
||||
|| get_sha1_hex(buf + 5, b->branch_tree.sha1))
|
||||
die("The commit %s is corrupt", sha1_to_hex(b->sha1));
|
||||
free(buf);
|
||||
/* from ... */
|
||||
if (!strncmp("from ", command_buf.buf, 5)) {
|
||||
const char *from;
|
||||
struct branch *s;
|
||||
|
||||
from = strchr(command_buf.buf, ' ') + 1;
|
||||
str_uq = unquote_c_style(from, &endp);
|
||||
if (str_uq) {
|
||||
if (*endp)
|
||||
die("Garbage after string in: %s", command_buf.buf);
|
||||
from = str_uq;
|
||||
}
|
||||
} else
|
||||
die("Not a SHA1 or branch: %s", base);
|
||||
|
||||
s = lookup_branch(from);
|
||||
if (b == s)
|
||||
die("Can't create a branch from itself: %s", b->name);
|
||||
else if (s) {
|
||||
memcpy(b->sha1, s->sha1, 20);
|
||||
memcpy(b->branch_tree.sha1, s->branch_tree.sha1, 20);
|
||||
} else if (!get_sha1(from, b->sha1)) {
|
||||
if (!memcmp(b->sha1, null_sha1, 20))
|
||||
memcpy(b->branch_tree.sha1, null_sha1, 20);
|
||||
else {
|
||||
unsigned long size;
|
||||
char *buf;
|
||||
|
||||
buf = read_object_with_reference(b->sha1,
|
||||
type_names[OBJ_COMMIT], &size, b->sha1);
|
||||
if (!buf || size < 46)
|
||||
die("Not a valid commit: %s", from);
|
||||
if (memcmp("tree ", buf, 5)
|
||||
|| get_sha1_hex(buf + 5, b->branch_tree.sha1))
|
||||
die("The commit %s is corrupt", sha1_to_hex(b->sha1));
|
||||
free(buf);
|
||||
}
|
||||
} else
|
||||
die("Invalid ref name or SHA1 expression: %s", from);
|
||||
|
||||
if (str_uq)
|
||||
free(str_uq);
|
||||
read_next_command();
|
||||
} else {
|
||||
memcpy(b->sha1, null_sha1, 20);
|
||||
memcpy(b->branch_tree.sha1, null_sha1, 20);
|
||||
}
|
||||
|
||||
if (command_buf.eof || command_buf.len > 1)
|
||||
die("An lf did not terminate the branch command as expected.");
|
||||
}
|
||||
|
||||
int main(int argc, const char **argv)
|
||||
|
|
@ -1087,26 +1251,28 @@ int main(int argc, const char **argv)
|
|||
if (pack_fd < 0)
|
||||
die("Can't create %s: %s", pack_name, strerror(errno));
|
||||
|
||||
init_pack_header();
|
||||
alloc_objects(est_obj_cnt);
|
||||
strbuf_init(&command_buf);
|
||||
|
||||
atom_table = xcalloc(atom_table_sz, sizeof(struct atom_str*));
|
||||
branch_table = xcalloc(branch_table_sz, sizeof(struct branch*));
|
||||
avail_tree_table = xcalloc(avail_tree_table_sz, sizeof(struct avail_tree_content*));
|
||||
|
||||
init_pack_header();
|
||||
for (;;) {
|
||||
unsigned long cmd;
|
||||
if (optional_read(0, &cmd, 4))
|
||||
read_next_command();
|
||||
if (command_buf.eof)
|
||||
break;
|
||||
|
||||
switch (ntohl(cmd)) {
|
||||
case 'blob': cmd_new_blob(); break;
|
||||
case 'comt': cmd_new_commit(); break;
|
||||
case 'brch': cmd_new_branch(); break;
|
||||
default:
|
||||
die("Invalid command %lu", cmd);
|
||||
}
|
||||
else if (!strcmp("blob", command_buf.buf))
|
||||
cmd_new_blob();
|
||||
else if (!strncmp("branch ", command_buf.buf, 7))
|
||||
cmd_new_branch();
|
||||
else if (!strncmp("commit ", command_buf.buf, 7))
|
||||
cmd_new_commit();
|
||||
else
|
||||
die("Unsupported command: %s", command_buf.buf);
|
||||
}
|
||||
|
||||
fixup_header_footer();
|
||||
close(pack_fd);
|
||||
write_index(idx_name);
|
||||
|
|
|
|||
Loading…
Reference in New Issue