зеркало из https://github.com/microsoft/git.git
397 строки
8.4 KiB
C
397 строки
8.4 KiB
C
#include "cache.h"
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#include "pkt-line.h"
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#include "quote.h"
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#include <sys/wait.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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/*
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* Read all the refs from the other end
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*/
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struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match)
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{
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*list = NULL;
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for (;;) {
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struct ref *ref;
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unsigned char old_sha1[20];
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static char buffer[1000];
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char *name;
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int len;
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len = packet_read_line(in, buffer, sizeof(buffer));
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if (!len)
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break;
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if (buffer[len-1] == '\n')
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buffer[--len] = 0;
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if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
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die("protocol error: expected sha/ref, got '%s'", buffer);
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name = buffer + 41;
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if (nr_match && !path_match(name, nr_match, match))
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continue;
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ref = xcalloc(1, sizeof(*ref) + len - 40);
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memcpy(ref->old_sha1, old_sha1, 20);
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memcpy(ref->name, buffer + 41, len - 40);
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*list = ref;
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list = &ref->next;
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}
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return list;
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}
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int get_ack(int fd, unsigned char *result_sha1)
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{
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static char line[1000];
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int len = packet_read_line(fd, line, sizeof(line));
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if (!len)
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die("git-fetch-pack: expected ACK/NAK, got EOF");
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if (line[len-1] == '\n')
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line[--len] = 0;
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if (!strcmp(line, "NAK"))
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return 0;
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if (!strncmp(line, "ACK ", 3)) {
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if (!get_sha1_hex(line+4, result_sha1))
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return 1;
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}
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die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
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}
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int path_match(const char *path, int nr, char **match)
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{
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int i;
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int pathlen = strlen(path);
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for (i = 0; i < nr; i++) {
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char *s = match[i];
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int len = strlen(s);
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if (!len || len > pathlen)
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continue;
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if (memcmp(path + pathlen - len, s, len))
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continue;
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if (pathlen > len && path[pathlen - len - 1] != '/')
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continue;
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*s = 0;
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return 1;
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}
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return 0;
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}
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struct refspec {
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char *src;
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char *dst;
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};
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static struct refspec *parse_ref_spec(int nr_refspec, char **refspec)
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{
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int i;
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struct refspec *rs = xmalloc(sizeof(*rs) * (nr_refspec + 1));
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for (i = 0; i < nr_refspec; i++) {
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char *sp, *dp, *ep;
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sp = refspec[i];
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ep = strchr(sp, ':');
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if (ep) {
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dp = ep + 1;
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*ep = 0;
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}
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else
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dp = sp;
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rs[i].src = sp;
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rs[i].dst = dp;
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}
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rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
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return rs;
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}
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static int count_refspec_match(const char *pattern,
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struct ref *refs,
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struct ref **matched_ref)
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{
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int match;
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int patlen = strlen(pattern);
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for (match = 0; refs; refs = refs->next) {
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char *name = refs->name;
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int namelen = strlen(name);
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if (namelen < patlen ||
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memcmp(name + namelen - patlen, pattern, patlen))
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continue;
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if (namelen != patlen && name[namelen - patlen - 1] != '/')
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continue;
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match++;
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*matched_ref = refs;
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}
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return match;
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}
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static void link_dst_tail(struct ref *ref, struct ref ***tail)
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{
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**tail = ref;
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*tail = &ref->next;
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**tail = NULL;
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}
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static int match_explicit_refs(struct ref *src, struct ref *dst,
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struct ref ***dst_tail, struct refspec *rs)
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{
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int i, errs;
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for (i = errs = 0; rs[i].src; i++) {
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struct ref *matched_src, *matched_dst;
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matched_src = matched_dst = NULL;
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switch (count_refspec_match(rs[i].src, src, &matched_src)) {
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case 1:
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break;
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case 0:
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errs = 1;
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error("src refspec %s does not match any.");
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break;
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default:
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errs = 1;
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error("src refspec %s matches more than one.",
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rs[i].src);
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break;
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}
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switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
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case 1:
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break;
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case 0:
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if (!memcmp(rs[i].dst, "refs/", 5)) {
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int len = strlen(rs[i].dst) + 1;
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matched_dst = xcalloc(1, sizeof(*dst) + len);
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memcpy(matched_dst->name, rs[i].dst, len);
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link_dst_tail(matched_dst, dst_tail);
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}
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else if (!strcmp(rs[i].src, rs[i].dst) &&
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matched_src) {
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/* pushing "master:master" when
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* remote does not have master yet.
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*/
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int len = strlen(matched_src->name);
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matched_dst = xcalloc(1, sizeof(*dst) + len);
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memcpy(matched_dst->name, matched_src->name,
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len);
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link_dst_tail(matched_dst, dst_tail);
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}
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else {
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errs = 1;
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error("dst refspec %s does not match any "
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"existing ref on the remote and does "
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"not start with refs/.", rs[i].dst);
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}
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break;
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default:
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errs = 1;
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error("dst refspec %s matches more than one.",
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rs[i].dst);
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break;
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}
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if (errs)
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continue;
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if (matched_src->peer_ref) {
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errs = 1;
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error("src ref %s is sent to more than one dst.",
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matched_src->name);
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}
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else
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matched_src->peer_ref = matched_dst;
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if (matched_dst->peer_ref) {
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errs = 1;
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error("dst ref %s receives from more than one src.",
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matched_dst->name);
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}
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else
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matched_dst->peer_ref = matched_src;
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}
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return -errs;
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}
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static struct ref *find_ref_by_name(struct ref *list, const char *name)
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{
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for ( ; list; list = list->next)
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if (!strcmp(list->name, name))
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return list;
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return NULL;
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}
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int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
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int nr_refspec, char **refspec, int all)
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{
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struct refspec *rs = parse_ref_spec(nr_refspec, refspec);
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if (nr_refspec)
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return match_explicit_refs(src, dst, dst_tail, rs);
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/* pick the remainder */
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for ( ; src; src = src->next) {
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struct ref *dst_peer;
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if (src->peer_ref)
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continue;
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dst_peer = find_ref_by_name(dst, src->name);
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if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all))
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continue;
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if (!dst_peer) {
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/* Create a new one and link it */
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int len = strlen(src->name) + 1;
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dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
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memcpy(dst_peer->name, src->name, len);
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memcpy(dst_peer->new_sha1, src->new_sha1, 20);
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link_dst_tail(dst_peer, dst_tail);
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}
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dst_peer->peer_ref = src;
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}
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return 0;
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}
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enum protocol {
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PROTO_LOCAL = 1,
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PROTO_SSH,
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PROTO_GIT,
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};
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static enum protocol get_protocol(const char *name)
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{
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if (!strcmp(name, "ssh"))
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return PROTO_SSH;
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if (!strcmp(name, "git"))
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return PROTO_GIT;
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die("I don't handle protocol '%s'", name);
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}
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#define STR_(s) # s
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#define STR(s) STR_(s)
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static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
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{
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int sockfd = -1;
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char *colon, *end;
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char *port = STR(DEFAULT_GIT_PORT);
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struct addrinfo hints, *ai0, *ai;
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int gai;
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if (host[0] == '[') {
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end = strchr(host + 1, ']');
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if (end) {
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*end = 0;
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end++;
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host++;
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} else
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end = host;
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} else
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end = host;
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colon = strchr(end, ':');
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if (colon) {
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*colon = 0;
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port = colon + 1;
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}
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memset(&hints, 0, sizeof(hints));
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_protocol = IPPROTO_TCP;
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gai = getaddrinfo(host, port, &hints, &ai);
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if (gai)
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die("Unable to look up %s (%s)", host, gai_strerror(gai));
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for (ai0 = ai; ai; ai = ai->ai_next) {
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sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
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if (sockfd < 0)
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continue;
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if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
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close(sockfd);
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sockfd = -1;
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continue;
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}
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break;
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}
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freeaddrinfo(ai0);
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if (sockfd < 0)
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die("unable to connect a socket (%s)", strerror(errno));
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fd[0] = sockfd;
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fd[1] = sockfd;
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packet_write(sockfd, "%s %s\n", prog, path);
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return 0;
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}
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/*
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* Yeah, yeah, fixme. Need to pass in the heads etc.
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*/
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int git_connect(int fd[2], char *url, const char *prog)
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{
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char command[1024];
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char *host, *path;
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char *colon;
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int pipefd[2][2];
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pid_t pid;
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enum protocol protocol;
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host = NULL;
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path = url;
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colon = strchr(url, ':');
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protocol = PROTO_LOCAL;
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if (colon) {
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*colon = 0;
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host = url;
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path = colon+1;
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protocol = PROTO_SSH;
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if (!memcmp(path, "//", 2)) {
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char *slash = strchr(path + 2, '/');
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if (slash) {
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int nr = slash - path - 2;
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memmove(path, path+2, nr);
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path[nr] = 0;
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protocol = get_protocol(url);
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host = path;
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path = slash;
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}
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}
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}
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if (protocol == PROTO_GIT)
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return git_tcp_connect(fd, prog, host, path);
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if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
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die("unable to create pipe pair for communication");
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pid = fork();
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if (!pid) {
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snprintf(command, sizeof(command), "%s %s", prog,
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sq_quote(path));
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dup2(pipefd[1][0], 0);
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dup2(pipefd[0][1], 1);
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close(pipefd[0][0]);
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close(pipefd[0][1]);
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close(pipefd[1][0]);
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close(pipefd[1][1]);
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if (protocol == PROTO_SSH)
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execlp("ssh", "ssh", host, command, NULL);
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else
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execlp("sh", "sh", "-c", command, NULL);
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die("exec failed");
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}
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fd[0] = pipefd[0][0];
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fd[1] = pipefd[1][1];
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close(pipefd[0][1]);
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close(pipefd[1][0]);
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return pid;
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}
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int finish_connect(pid_t pid)
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{
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int ret;
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for (;;) {
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ret = waitpid(pid, NULL, 0);
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if (!ret)
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break;
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if (errno != EINTR)
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break;
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}
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return ret;
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}
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