mirror of
https://github.com/git/git
synced 2024-10-30 04:01:21 +00:00
a9486b02ec
This doesn't make the code uglier or harder to read, yet it makes the code more portable. This also simplifies checking for other potential incompatibilities. "gcc -std=c89 -pedantic" can flag many incompatible constructs as warnings, but C99 comments will cause it to emit an error. Signed-off-by: Pavel Roskin <proski@gnu.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
174 lines
3.6 KiB
C
174 lines
3.6 KiB
C
#ifndef COUNTERPART_ENV_NAME
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#define COUNTERPART_ENV_NAME "GIT_SSH_UPLOAD"
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#endif
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#ifndef COUNTERPART_PROGRAM_NAME
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#define COUNTERPART_PROGRAM_NAME "git-ssh-upload"
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#endif
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#ifndef MY_PROGRAM_NAME
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#define MY_PROGRAM_NAME "git-ssh-fetch"
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#endif
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#include "cache.h"
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#include "commit.h"
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#include "rsh.h"
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#include "fetch.h"
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#include "refs.h"
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static int fd_in;
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static int fd_out;
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static unsigned char remote_version = 0;
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static unsigned char local_version = 1;
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static ssize_t force_write(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 = write(fd, (char *) buffer + ret, length - ret);
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if (size < 0) {
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return size;
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}
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if (size == 0) {
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return ret;
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}
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ret += size;
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}
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return ret;
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}
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static int prefetches = 0;
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static struct object_list *in_transit = NULL;
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static struct object_list **end_of_transit = &in_transit;
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void prefetch(unsigned char *sha1)
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{
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char type = 'o';
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struct object_list *node;
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if (prefetches > 100) {
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fetch(in_transit->item->sha1);
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}
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node = xmalloc(sizeof(struct object_list));
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node->next = NULL;
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node->item = lookup_unknown_object(sha1);
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*end_of_transit = node;
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end_of_transit = &node->next;
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force_write(fd_out, &type, 1);
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force_write(fd_out, sha1, 20);
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prefetches++;
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}
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static char conn_buf[4096];
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static size_t conn_buf_posn = 0;
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int fetch(unsigned char *sha1)
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{
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int ret;
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signed char remote;
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struct object_list *temp;
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if (memcmp(sha1, in_transit->item->sha1, 20)) {
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/* we must have already fetched it to clean the queue */
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return has_sha1_file(sha1) ? 0 : -1;
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}
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prefetches--;
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temp = in_transit;
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in_transit = in_transit->next;
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if (!in_transit)
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end_of_transit = &in_transit;
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free(temp);
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if (conn_buf_posn) {
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remote = conn_buf[0];
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memmove(conn_buf, conn_buf + 1, --conn_buf_posn);
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} else {
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if (read(fd_in, &remote, 1) < 1)
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return -1;
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}
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/* fprintf(stderr, "Got %d\n", remote); */
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if (remote < 0)
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return remote;
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ret = write_sha1_from_fd(sha1, fd_in, conn_buf, 4096, &conn_buf_posn);
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if (!ret)
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pull_say("got %s\n", sha1_to_hex(sha1));
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return ret;
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}
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static int get_version(void)
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{
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char type = 'v';
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write(fd_out, &type, 1);
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write(fd_out, &local_version, 1);
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if (read(fd_in, &remote_version, 1) < 1) {
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return error("Couldn't read version from remote end");
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}
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return 0;
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}
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int fetch_ref(char *ref, unsigned char *sha1)
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{
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signed char remote;
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char type = 'r';
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write(fd_out, &type, 1);
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write(fd_out, ref, strlen(ref) + 1);
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read(fd_in, &remote, 1);
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if (remote < 0)
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return remote;
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read(fd_in, sha1, 20);
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return 0;
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}
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static const char ssh_fetch_usage[] =
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MY_PROGRAM_NAME
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" [-c] [-t] [-a] [-v] [-d] [--recover] [-w ref] commit-id url";
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int main(int argc, char **argv)
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{
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char *commit_id;
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char *url;
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int arg = 1;
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const char *prog;
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prog = getenv("GIT_SSH_PUSH");
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if (!prog) prog = "git-ssh-upload";
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setup_git_directory();
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git_config(git_default_config);
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while (arg < argc && argv[arg][0] == '-') {
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if (argv[arg][1] == 't') {
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get_tree = 1;
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} else if (argv[arg][1] == 'c') {
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get_history = 1;
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} else if (argv[arg][1] == 'a') {
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get_all = 1;
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get_tree = 1;
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get_history = 1;
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} else if (argv[arg][1] == 'v') {
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get_verbosely = 1;
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} else if (argv[arg][1] == 'w') {
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write_ref = argv[arg + 1];
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arg++;
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} else if (!strcmp(argv[arg], "--recover")) {
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get_recover = 1;
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}
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arg++;
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}
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if (argc < arg + 2) {
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usage(ssh_fetch_usage);
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return 1;
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}
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commit_id = argv[arg];
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url = argv[arg + 1];
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write_ref_log_details = url;
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if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
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return 1;
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if (get_version())
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return 1;
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if (pull(commit_id))
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return 1;
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return 0;
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}
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