4a62b61939
When a remote repository is deltified, we need to get the objects that a deltified object we want to obtain is based upon. The initial parts of each retrieved SHA1 file is inflated and inspected to see if it is deltified, and its base object is asked from the remote side when it is. Since this partial inflation and inspection has a small performance hit, it can optionally be skipped by giving -d flag to git-*-pull commands. This flag should be used only when the remote repository is known to have no deltified objects. Rsync transport does not have this problem since it fetches everything the remote side has. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/*
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* Copyright (C) 2005 Junio C Hamano
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*/
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#include "cache.h"
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#include "commit.h"
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#include "pull.h"
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static int use_link = 0;
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static int use_symlink = 0;
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static int use_filecopy = 1;
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static char *path;
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int fetch(unsigned char *sha1)
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{
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static int object_name_start = -1;
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static char filename[PATH_MAX];
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char *hex = sha1_to_hex(sha1);
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const char *dest_filename = sha1_file_name(sha1);
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if (object_name_start < 0) {
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strcpy(filename, path); /* e.g. git.git */
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strcat(filename, "/objects/");
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object_name_start = strlen(filename);
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}
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filename[object_name_start+0] = hex[0];
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filename[object_name_start+1] = hex[1];
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filename[object_name_start+2] = '/';
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strcpy(filename + object_name_start + 3, hex + 2);
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if (use_link) {
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if (!link(filename, dest_filename)) {
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pull_say("link %s\n", hex);
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return 0;
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}
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/* If we got ENOENT there is no point continuing. */
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if (errno == ENOENT) {
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fprintf(stderr, "does not exist %s\n", filename);
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return -1;
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}
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}
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if (use_symlink && !symlink(filename, dest_filename)) {
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pull_say("symlink %s\n", hex);
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return 0;
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}
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if (use_filecopy) {
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int ifd, ofd, status;
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struct stat st;
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void *map;
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ifd = open(filename, O_RDONLY);
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if (ifd < 0 || fstat(ifd, &st) < 0) {
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close(ifd);
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fprintf(stderr, "cannot open %s\n", filename);
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return -1;
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}
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map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, ifd, 0);
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close(ifd);
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if (-1 == (int)(long)map) {
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fprintf(stderr, "cannot mmap %s\n", filename);
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return -1;
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}
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ofd = open(dest_filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
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status = ((ofd < 0) ||
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(write(ofd, map, st.st_size) != st.st_size));
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munmap(map, st.st_size);
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close(ofd);
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if (status)
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fprintf(stderr, "cannot write %s\n", dest_filename);
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else
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pull_say("copy %s\n", hex);
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return status;
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}
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fprintf(stderr, "failed to copy %s with given copy methods.\n", hex);
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return -1;
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}
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static const char *local_pull_usage =
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"git-local-pull [-c] [-t] [-a] [-l] [-s] [-n] [-v] [-d] commit-id path";
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/*
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* By default we only use file copy.
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* If -l is specified, a hard link is attempted.
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* If -s is specified, then a symlink is attempted.
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* If -n is _not_ specified, then a regular file-to-file copy is done.
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*/
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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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int arg = 1;
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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] == 'd')
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get_delta = 0;
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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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}
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else if (argv[arg][1] == 'l')
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use_link = 1;
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else if (argv[arg][1] == 's')
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use_symlink = 1;
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else if (argv[arg][1] == 'n')
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use_filecopy = 0;
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else if (argv[arg][1] == 'v')
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get_verbosely = 1;
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else
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usage(local_pull_usage);
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arg++;
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}
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if (argc < arg + 2)
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usage(local_pull_usage);
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commit_id = argv[arg];
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path = argv[arg + 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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