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/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
#include <pwd.h>
#include <time.h>
#define BLOCKING (1ul << 14)
#define ORIG_OFFSET (40)
/*
* Leave space at the beginning to insert the tag
* once we know how big things are.
*
* FIXME! Share the code with "write-tree.c"
*/
static void init_buffer(char **bufp, unsigned int *sizep)
{
char *buf = malloc(BLOCKING);
memset(buf, 0, ORIG_OFFSET);
*sizep = ORIG_OFFSET;
*bufp = buf;
}
static void add_buffer(char **bufp, unsigned int *sizep, const char *fmt, ...)
{
char one_line[2048];
va_list args;
int len;
unsigned long alloc, size, newsize;
char *buf;
va_start(args, fmt);
len = vsnprintf(one_line, sizeof(one_line), fmt, args);
va_end(args);
size = *sizep;
newsize = size + len;
alloc = (size + 32767) & ~32767;
buf = *bufp;
if (newsize > alloc) {
alloc = (newsize + 32767) & ~32767;
buf = realloc(buf, alloc);
*bufp = buf;
}
*sizep = newsize;
memcpy(buf + size, one_line, len);
}
static int prepend_integer(char *buffer, unsigned val, int i)
{
buffer[--i] = '\0';
do {
buffer[--i] = '0' + (val % 10);
val /= 10;
} while (val);
return i;
}
static void finish_buffer(char *tag, char **bufp, unsigned int *sizep)
{
int taglen;
int offset;
char *buf = *bufp;
unsigned int size = *sizep;
offset = prepend_integer(buf, size - ORIG_OFFSET, ORIG_OFFSET);
taglen = strlen(tag);
offset -= taglen;
buf += offset;
size -= offset;
memcpy(buf, tag, taglen);
*bufp = buf;
*sizep = size;
}
static void remove_special(char *p)
{
char c;
char *dst = p;
for (;;) {
c = *p;
p++;
switch(c) {
case '\n': case '<': case '>':
continue;
}
*dst++ = c;
if (!c)
break;
}
}
/*
* Having more than two parents may be strange, but hey, there's
* no conceptual reason why the file format couldn't accept multi-way
* merges. It might be the "union" of several packages, for example.
*
* I don't really expect that to happen, but this is here to make
* it clear that _conceptually_ it's ok..
*/
#define MAXPARENT (16)
int main(int argc, char **argv)
{
int i, len;
int parents = 0;
unsigned char tree_sha1[20];
unsigned char parent_sha1[MAXPARENT][20];
unsigned char commit_sha1[20];
char *gecos, *realgecos;
char *email, realemail[1000];
char *date, *realdate;
char comment[1000];
struct passwd *pw;
time_t now;
char *buffer;
unsigned int size;
if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
usage("commit-tree <sha1> [-p <sha1>]* < changelog");
for (i = 2; i < argc; i += 2) {
char *a, *b;
a = argv[i]; b = argv[i+1];
if (!b || strcmp(a, "-p") || get_sha1_hex(b, parent_sha1[parents]))
usage("commit-tree <sha1> [-p <sha1>]* < changelog");
parents++;
}
if (!parents)
fprintf(stderr, "Committing initial tree %s\n", argv[1]);
pw = getpwuid(getuid());
if (!pw)
die("You don't exist. Go away!");
realgecos = pw->pw_gecos;
len = strlen(pw->pw_name);
memcpy(realemail, pw->pw_name, len);
realemail[len] = '@';
gethostname(realemail+len+1, sizeof(realemail)-len-1);
time(&now);
realdate = ctime(&now);
gecos = getenv("AUTHOR_NAME") ? : realgecos;
email = getenv("AUTHOR_EMAIL") ? : realemail;
date = getenv("AUTHOR_DATE") ? : realdate;
remove_special(gecos); remove_special(realgecos);
remove_special(email); remove_special(realemail);
remove_special(date); remove_special(realdate);
init_buffer(&buffer, &size);
add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
/*
* NOTE! This ordering means that the same exact tree merged with a
* different order of parents will be a _different_ changeset even
* if everything else stays the same.
*/
for (i = 0; i < parents; i++)
add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));
/* Person/date information */
add_buffer(&buffer, &size, "author %s <%s> %s\n", gecos, email, date);
add_buffer(&buffer, &size, "committer %s <%s> %s\n\n", realgecos, realemail, realdate);
/* And add the comment */
while (fgets(comment, sizeof(comment), stdin) != NULL)
add_buffer(&buffer, &size, "%s", comment);
finish_buffer("commit ", &buffer, &size);
write_sha1_file(buffer, size, commit_sha1);
printf("%s\n", sha1_to_hex(commit_sha1));
return 0;
}
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