mirror of
https://github.com/git/git.git
synced 2024-12-12 11:24:02 +08:00
f7cc77d78b
This was brought on by a bad tree of Thomas Gleixner, where some bogus commit objects weren't warned about properly Signed-off-by: Linus Torvalds <torvalds@osdl.org>
463 lines
10 KiB
C
463 lines
10 KiB
C
#include <ctype.h>
|
|
#include "tag.h"
|
|
#include "commit.h"
|
|
#include "cache.h"
|
|
|
|
struct sort_node
|
|
{
|
|
/*
|
|
* the number of children of the associated commit
|
|
* that also occur in the list being sorted.
|
|
*/
|
|
unsigned int indegree;
|
|
|
|
/*
|
|
* reference to original list item that we will re-use
|
|
* on output.
|
|
*/
|
|
struct commit_list * list_item;
|
|
|
|
};
|
|
|
|
const char *commit_type = "commit";
|
|
|
|
enum cmit_fmt get_commit_format(const char *arg)
|
|
{
|
|
if (!*arg)
|
|
return CMIT_FMT_DEFAULT;
|
|
if (!strcmp(arg, "=raw"))
|
|
return CMIT_FMT_RAW;
|
|
if (!strcmp(arg, "=medium"))
|
|
return CMIT_FMT_MEDIUM;
|
|
if (!strcmp(arg, "=short"))
|
|
return CMIT_FMT_SHORT;
|
|
if (!strcmp(arg, "=full"))
|
|
return CMIT_FMT_FULL;
|
|
die("invalid --pretty format");
|
|
}
|
|
|
|
static struct commit *check_commit(struct object *obj, const unsigned char *sha1)
|
|
{
|
|
if (obj->type != commit_type) {
|
|
error("Object %s is a %s, not a commit",
|
|
sha1_to_hex(sha1), obj->type);
|
|
return NULL;
|
|
}
|
|
return (struct commit *) obj;
|
|
}
|
|
|
|
struct commit *lookup_commit_reference(const unsigned char *sha1)
|
|
{
|
|
struct object *obj = parse_object(sha1);
|
|
|
|
if (!obj)
|
|
return NULL;
|
|
while (obj->type == tag_type)
|
|
obj = parse_object(((struct tag *)obj)->tagged->sha1);
|
|
|
|
return check_commit(obj, sha1);
|
|
}
|
|
|
|
struct commit *lookup_commit(const unsigned char *sha1)
|
|
{
|
|
struct object *obj = lookup_object(sha1);
|
|
if (!obj) {
|
|
struct commit *ret = xmalloc(sizeof(struct commit));
|
|
memset(ret, 0, sizeof(struct commit));
|
|
created_object(sha1, &ret->object);
|
|
ret->object.type = commit_type;
|
|
return ret;
|
|
}
|
|
if (!obj->type)
|
|
obj->type = commit_type;
|
|
return check_commit(obj, sha1);
|
|
}
|
|
|
|
static unsigned long parse_commit_date(const char *buf)
|
|
{
|
|
unsigned long date;
|
|
|
|
if (memcmp(buf, "author", 6))
|
|
return 0;
|
|
while (*buf++ != '\n')
|
|
/* nada */;
|
|
if (memcmp(buf, "committer", 9))
|
|
return 0;
|
|
while (*buf++ != '>')
|
|
/* nada */;
|
|
date = strtoul(buf, NULL, 10);
|
|
if (date == ULONG_MAX)
|
|
date = 0;
|
|
return date;
|
|
}
|
|
|
|
int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
|
|
{
|
|
char *bufptr = buffer;
|
|
unsigned char parent[20];
|
|
struct commit_list **pptr;
|
|
|
|
if (item->object.parsed)
|
|
return 0;
|
|
item->object.parsed = 1;
|
|
if (memcmp(bufptr, "tree ", 5))
|
|
return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
|
|
if (get_sha1_hex(bufptr + 5, parent) < 0)
|
|
return error("bad tree pointer in commit %s\n", sha1_to_hex(item->object.sha1));
|
|
item->tree = lookup_tree(parent);
|
|
if (item->tree)
|
|
add_ref(&item->object, &item->tree->object);
|
|
bufptr += 46; /* "tree " + "hex sha1" + "\n" */
|
|
pptr = &item->parents;
|
|
while (!memcmp(bufptr, "parent ", 7)) {
|
|
struct commit *new_parent;
|
|
|
|
if (get_sha1_hex(bufptr + 7, parent) || bufptr[47] != '\n')
|
|
return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
|
|
new_parent = lookup_commit(parent);
|
|
if (new_parent) {
|
|
pptr = &commit_list_insert(new_parent, pptr)->next;
|
|
add_ref(&item->object, &new_parent->object);
|
|
}
|
|
bufptr += 48;
|
|
}
|
|
item->date = parse_commit_date(bufptr);
|
|
return 0;
|
|
}
|
|
|
|
int parse_commit(struct commit *item)
|
|
{
|
|
char type[20];
|
|
void *buffer;
|
|
unsigned long size;
|
|
int ret;
|
|
|
|
if (item->object.parsed)
|
|
return 0;
|
|
buffer = read_sha1_file(item->object.sha1, type, &size);
|
|
if (!buffer)
|
|
return error("Could not read %s",
|
|
sha1_to_hex(item->object.sha1));
|
|
if (strcmp(type, commit_type)) {
|
|
free(buffer);
|
|
return error("Object %s not a commit",
|
|
sha1_to_hex(item->object.sha1));
|
|
}
|
|
ret = parse_commit_buffer(item, buffer, size);
|
|
if (!ret) {
|
|
item->buffer = buffer;
|
|
return 0;
|
|
}
|
|
free(buffer);
|
|
return ret;
|
|
}
|
|
|
|
struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
|
|
{
|
|
struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
|
|
new_list->item = item;
|
|
new_list->next = *list_p;
|
|
*list_p = new_list;
|
|
return new_list;
|
|
}
|
|
|
|
void free_commit_list(struct commit_list *list)
|
|
{
|
|
while (list) {
|
|
struct commit_list *temp = list;
|
|
list = temp->next;
|
|
free(temp);
|
|
}
|
|
}
|
|
|
|
struct commit_list * insert_by_date(struct commit *item, struct commit_list **list)
|
|
{
|
|
struct commit_list **pp = list;
|
|
struct commit_list *p;
|
|
while ((p = *pp) != NULL) {
|
|
if (p->item->date < item->date) {
|
|
break;
|
|
}
|
|
pp = &p->next;
|
|
}
|
|
return commit_list_insert(item, pp);
|
|
}
|
|
|
|
|
|
void sort_by_date(struct commit_list **list)
|
|
{
|
|
struct commit_list *ret = NULL;
|
|
while (*list) {
|
|
insert_by_date((*list)->item, &ret);
|
|
*list = (*list)->next;
|
|
}
|
|
*list = ret;
|
|
}
|
|
|
|
struct commit *pop_most_recent_commit(struct commit_list **list,
|
|
unsigned int mark)
|
|
{
|
|
struct commit *ret = (*list)->item;
|
|
struct commit_list *parents = ret->parents;
|
|
struct commit_list *old = *list;
|
|
|
|
*list = (*list)->next;
|
|
free(old);
|
|
|
|
while (parents) {
|
|
struct commit *commit = parents->item;
|
|
parse_commit(commit);
|
|
if (!(commit->object.flags & mark)) {
|
|
commit->object.flags |= mark;
|
|
insert_by_date(commit, list);
|
|
}
|
|
parents = parents->next;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Generic support for pretty-printing the header
|
|
*/
|
|
static int get_one_line(const char *msg, unsigned long len)
|
|
{
|
|
int ret = 0;
|
|
|
|
while (len--) {
|
|
char c = *msg++;
|
|
ret++;
|
|
if (c == '\n')
|
|
break;
|
|
if (!c)
|
|
return 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, const char *line)
|
|
{
|
|
char *date;
|
|
unsigned int namelen;
|
|
unsigned long time;
|
|
int tz, ret;
|
|
|
|
date = strchr(line, '>');
|
|
if (!date)
|
|
return 0;
|
|
namelen = ++date - line;
|
|
time = strtoul(date, &date, 10);
|
|
tz = strtol(date, NULL, 10);
|
|
|
|
ret = sprintf(buf, "%s: %.*s\n", what, namelen, line);
|
|
if (fmt == CMIT_FMT_MEDIUM)
|
|
ret += sprintf(buf + ret, "Date: %s\n", show_date(time, tz));
|
|
return ret;
|
|
}
|
|
|
|
static int is_empty_line(const char *line, int len)
|
|
{
|
|
while (len && isspace(line[len-1]))
|
|
len--;
|
|
return !len;
|
|
}
|
|
|
|
static int add_parent_info(enum cmit_fmt fmt, char *buf, const char *line, int parents)
|
|
{
|
|
int offset = 0;
|
|
switch (parents) {
|
|
case 1:
|
|
break;
|
|
case 2:
|
|
/* Go back to the previous line: 40 characters of previous parent, and one '\n' */
|
|
offset = sprintf(buf, "Merge: %.40s\n", line-41);
|
|
/* Fallthrough */
|
|
default:
|
|
/* Replace the previous '\n' with a space */
|
|
buf[offset-1] = ' ';
|
|
offset += sprintf(buf + offset, "%.40s\n", line+7);
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
unsigned long pretty_print_commit(enum cmit_fmt fmt, const char *msg, unsigned long len, char *buf, unsigned long space)
|
|
{
|
|
int hdr = 1, body = 0;
|
|
unsigned long offset = 0;
|
|
int parents = 0;
|
|
|
|
for (;;) {
|
|
const char *line = msg;
|
|
int linelen = get_one_line(msg, len);
|
|
|
|
if (!linelen)
|
|
break;
|
|
|
|
/*
|
|
* We want some slop for indentation and a possible
|
|
* final "...". Thus the "+ 20".
|
|
*/
|
|
if (offset + linelen + 20 > space) {
|
|
memcpy(buf + offset, " ...\n", 8);
|
|
offset += 8;
|
|
break;
|
|
}
|
|
|
|
msg += linelen;
|
|
len -= linelen;
|
|
if (hdr) {
|
|
if (linelen == 1) {
|
|
hdr = 0;
|
|
buf[offset++] = '\n';
|
|
continue;
|
|
}
|
|
if (fmt == CMIT_FMT_RAW) {
|
|
memcpy(buf + offset, line, linelen);
|
|
offset += linelen;
|
|
continue;
|
|
}
|
|
if (!memcmp(line, "parent ", 7)) {
|
|
if (linelen != 48)
|
|
die("bad parent line in commit");
|
|
offset += add_parent_info(fmt, buf + offset, line, ++parents);
|
|
}
|
|
if (!memcmp(line, "author ", 7))
|
|
offset += add_user_info("Author", fmt, buf + offset, line + 7);
|
|
if (fmt == CMIT_FMT_FULL) {
|
|
if (!memcmp(line, "committer ", 10))
|
|
offset += add_user_info("Commit", fmt, buf + offset, line + 10);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (is_empty_line(line, linelen)) {
|
|
if (!body)
|
|
continue;
|
|
if (fmt == CMIT_FMT_SHORT)
|
|
break;
|
|
} else {
|
|
body = 1;
|
|
}
|
|
memset(buf + offset, ' ', 4);
|
|
memcpy(buf + offset + 4, line, linelen);
|
|
offset += linelen + 4;
|
|
}
|
|
/* Make sure there is an EOLN */
|
|
if (buf[offset - 1] != '\n')
|
|
buf[offset++] = '\n';
|
|
buf[offset] = '\0';
|
|
return offset;
|
|
}
|
|
|
|
struct commit *pop_commit(struct commit_list **stack)
|
|
{
|
|
struct commit_list *top = *stack;
|
|
struct commit *item = top ? top->item : NULL;
|
|
|
|
if (top) {
|
|
*stack = top->next;
|
|
free(top);
|
|
}
|
|
return item;
|
|
}
|
|
|
|
int count_parents(struct commit * commit)
|
|
{
|
|
int count = 0;
|
|
struct commit_list * parents = commit->parents;
|
|
for (count=0;parents; parents=parents->next,count++)
|
|
;
|
|
return count;
|
|
}
|
|
|
|
/*
|
|
* Performs an in-place topological sort on the list supplied.
|
|
*/
|
|
void sort_in_topological_order(struct commit_list ** list)
|
|
{
|
|
struct commit_list * next = *list;
|
|
struct commit_list * work = NULL;
|
|
struct commit_list ** pptr = list;
|
|
struct sort_node * nodes;
|
|
struct sort_node * next_nodes;
|
|
int count = 0;
|
|
|
|
/* determine the size of the list */
|
|
while (next) {
|
|
next = next->next;
|
|
count++;
|
|
}
|
|
/* allocate an array to help sort the list */
|
|
nodes = xcalloc(count, sizeof(*nodes));
|
|
/* link the list to the array */
|
|
next_nodes = nodes;
|
|
next=*list;
|
|
while (next) {
|
|
next_nodes->list_item = next;
|
|
next->item->object.util = next_nodes;
|
|
next_nodes++;
|
|
next = next->next;
|
|
}
|
|
/* update the indegree */
|
|
next=*list;
|
|
while (next) {
|
|
struct commit_list * parents = next->item->parents;
|
|
while (parents) {
|
|
struct commit * parent=parents->item;
|
|
struct sort_node * pn = (struct sort_node *)parent->object.util;
|
|
|
|
if (pn)
|
|
pn->indegree++;
|
|
parents=parents->next;
|
|
}
|
|
next=next->next;
|
|
}
|
|
/*
|
|
* find the tips
|
|
*
|
|
* tips are nodes not reachable from any other node in the list
|
|
*
|
|
* the tips serve as a starting set for the work queue.
|
|
*/
|
|
next=*list;
|
|
while (next) {
|
|
struct sort_node * node = (struct sort_node *)next->item->object.util;
|
|
|
|
if (node->indegree == 0) {
|
|
commit_list_insert(next->item, &work);
|
|
}
|
|
next=next->next;
|
|
}
|
|
/* process the list in topological order */
|
|
while (work) {
|
|
struct commit * work_item = pop_commit(&work);
|
|
struct sort_node * work_node = (struct sort_node *)work_item->object.util;
|
|
struct commit_list * parents = work_item->parents;
|
|
|
|
while (parents) {
|
|
struct commit * parent=parents->item;
|
|
struct sort_node * pn = (struct sort_node *)parent->object.util;
|
|
|
|
if (pn) {
|
|
/*
|
|
* parents are only enqueued for emission
|
|
* when all their children have been emitted thereby
|
|
* guaranteeing topological order.
|
|
*/
|
|
pn->indegree--;
|
|
if (!pn->indegree)
|
|
commit_list_insert(parent, &work);
|
|
}
|
|
parents=parents->next;
|
|
}
|
|
/*
|
|
* work_item is a commit all of whose children
|
|
* have already been emitted. we can emit it now.
|
|
*/
|
|
*pptr = work_node->list_item;
|
|
pptr = &(*pptr)->next;
|
|
*pptr = NULL;
|
|
work_item->object.util = NULL;
|
|
}
|
|
free(nodes);
|
|
}
|