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authorLinus Torvalds <torvalds@g5.osdl.org>2005-07-04 20:26:53 (GMT)
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-04 20:26:53 (GMT)
commitdef88e9afbf915ad76781aba7274398963b5e1a7 (patch)
treef522cf646eafdefe3f916ff58ecfc779dde69ada
parent013e7c7ff498aae82d799f80da37fbd395545456 (diff)
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Commit first cut at "git-fetch-pack"
It's meant to be used by "git fetch" for the local and ssh case. It doesn't actually do the fetching now, but it does discover the common commit point.
-rw-r--r--Makefile9
-rw-r--r--fetch-pack.c125
-rw-r--r--upload-pack.c86
3 files changed, 216 insertions, 4 deletions
diff --git a/Makefile b/Makefile
index e7a2644..a833a85 100644
--- a/Makefile
+++ b/Makefile
@@ -40,10 +40,10 @@ PROG= git-update-cache git-diff-files git-init-db git-write-tree \
git-unpack-file git-export git-diff-cache git-convert-cache \
git-http-pull git-ssh-push git-ssh-pull git-rev-list git-mktag \
git-diff-helper git-tar-tree git-local-pull git-write-blob \
- git-get-tar-commit-id git-apply git-stripspace \
- git-cvs2git git-diff-stages git-rev-parse git-patch-id \
- git-pack-objects git-unpack-objects git-verify-pack \
- git-receive-pack git-send-pack git-prune-packed
+ git-get-tar-commit-id git-apply git-stripspace git-cvs2git \
+ git-diff-stages git-rev-parse git-patch-id git-pack-objects \
+ git-unpack-objects git-verify-pack git-receive-pack git-send-pack \
+ git-prune-packed git-fetch-pack git-upload-pack
all: $(PROG)
@@ -139,6 +139,7 @@ git-verify-pack: verify-pack.c
git-receive-pack: receive-pack.c
git-send-pack: send-pack.c
git-prune-packed: prune-packed.c
+git-fetch-pack: fetch-pack.c
git-http-pull: LIBS += -lcurl
git-rev-list: LIBS += -lssl
diff --git a/fetch-pack.c b/fetch-pack.c
new file mode 100644
index 0000000..e9035a1
--- /dev/null
+++ b/fetch-pack.c
@@ -0,0 +1,125 @@
+#include "cache.h"
+#include "pkt-line.h"
+
+static const char fetch_pack_usage[] = "git-fetch-pack [host:]directory [heads]* < mycommitlist";
+static const char *exec = "git-upload-pack";
+
+static int get_ack(int fd, unsigned char *result_sha1)
+{
+ static char line[1000];
+ int len = packet_read_line(fd, line, sizeof(line));
+
+ if (!len)
+ die("git-fetch-pack: expected ACK/NAK, got EOF");
+ if (line[len-1] == '\n')
+ line[--len] = 0;
+ if (!strcmp(line, "NAK"))
+ return 0;
+ if (!strncmp(line, "ACK ", 3)) {
+ if (!get_sha1_hex(line+4, result_sha1))
+ return 1;
+ }
+ die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
+}
+
+static int find_common(int fd[2], unsigned char *result_sha1)
+{
+ static char line[1000];
+ int count = 0, flushes = 0;
+
+ while (fgets(line, sizeof(line), stdin) != NULL) {
+ unsigned char sha1[20];
+ if (get_sha1_hex(line, sha1))
+ die("git-fetch-pack: expected object name, got crud");
+ packet_write(fd[1], "have %s\n", sha1_to_hex(sha1));
+ if (!(31 & ++count)) {
+ packet_flush(fd[1]);
+ flushes++;
+
+ /*
+ * We keep one window "ahead" of the other side, and
+ * will wait for an ACK only on the next one
+ */
+ if (count == 32)
+ continue;
+ if (get_ack(fd[0], result_sha1))
+ return 0;
+ flushes--;
+ }
+ }
+ flushes++;
+ packet_flush(fd[1]);
+ while (flushes) {
+ flushes--;
+ if (get_ack(fd[0], result_sha1))
+ return 0;
+ }
+ return -1;
+}
+
+static int get_remote_heads(int fd, int nr_match, char **match)
+{
+ for (;;) {
+ static char line[1000];
+ unsigned char sha1[20];
+ char *refname;
+ int len;
+
+ len = packet_read_line(fd, line, sizeof(line));
+ if (!len)
+ break;
+ if (line[len-1] == '\n')
+ line[--len] = 0;
+ if (len < 42 || get_sha1_hex(line, sha1))
+ die("git-fetch-pack: protocol error - expected ref descriptor, got '%sä'", line);
+ refname = line+41;
+ if (nr_match && !path_match(refname, nr_match, match))
+ continue;
+ printf("%s %s\n", sha1_to_hex(sha1), refname);
+ }
+ return 0;
+}
+
+static int fetch_pack(int fd[2], int nr_match, char **match)
+{
+ unsigned char sha1[20];
+
+ get_remote_heads(fd[0], nr_match, match);
+ if (find_common(fd, sha1) < 0)
+ die("git-fetch-pack: no common commits");
+ printf("common commit: %s\n", sha1_to_hex(sha1));
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ int i, ret, nr_heads;
+ char *dest = NULL, **heads;
+ int fd[2];
+ pid_t pid;
+
+ nr_heads = 0;
+ heads = NULL;
+ for (i = 1; i < argc; i++) {
+ char *arg = argv[i];
+
+ if (*arg == '-') {
+ /* Arguments go here */
+ usage(fetch_pack_usage);
+ }
+ dest = arg;
+ heads = argv + i + 1;
+ nr_heads = argc - i - 1;
+ break;
+ }
+ if (!dest)
+ usage(fetch_pack_usage);
+ pid = git_connect(fd, dest, exec);
+ if (pid < 0)
+ return 1;
+ ret = fetch_pack(fd, nr_heads, heads);
+ close(fd[0]);
+ close(fd[1]);
+ finish_connect(pid);
+ return ret;
+}
diff --git a/upload-pack.c b/upload-pack.c
new file mode 100644
index 0000000..18b8e1a
--- /dev/null
+++ b/upload-pack.c
@@ -0,0 +1,86 @@
+#include "cache.h"
+#include "refs.h"
+#include "pkt-line.h"
+
+static const char upload_pack_usage[] = "git-upload-pack <dir>";
+
+static int got_sha1(char *hex, unsigned char *sha1)
+{
+ if (get_sha1_hex(hex, sha1))
+ die("git-upload-pack: expected SHA1 object, got '%s'", hex);
+ return has_sha1_file(sha1);
+}
+
+static int get_common_commits(void)
+{
+ static char line[1000];
+ unsigned char sha1[20];
+ int len;
+
+ for(;;) {
+ len = packet_read_line(0, line, sizeof(line));
+
+ if (!len) {
+ packet_write(1, "NAK\n");
+ continue;
+ }
+ if (line[len-1] == '\n')
+ line[--len] = 0;
+ if (!strncmp(line, "have ", 5)) {
+ if (got_sha1(line+5, sha1)) {
+ packet_write(1, "ACK %s\n", sha1_to_hex(sha1));
+ break;
+ }
+ continue;
+ }
+ if (!strcmp(line, "done")) {
+ packet_write(1, "NAK\n");
+ return -1;
+ }
+ die("git-upload-pack: expected SHA1 list, got '%s'", line);
+ }
+
+ for (;;) {
+ len = packet_read_line(0, line, sizeof(line));
+ if (!len)
+ break;
+ if (!strncmp(line, "have ", 5)) {
+ got_sha1(line+5, sha1);
+ continue;
+ }
+ if (!strcmp(line, "done"))
+ break;
+ die("git-upload-pack: expected SHA1 list, got '%s'", line);
+ }
+ return 0;
+}
+
+static int send_ref(const char *refname, const unsigned char *sha1)
+{
+ packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
+ return 0;
+}
+
+static int upload_pack(void)
+{
+ for_each_ref(send_ref);
+ packet_flush(1);
+ get_common_commits();
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ const char *dir;
+ if (argc != 2)
+ usage(upload_pack_usage);
+ dir = argv[1];
+ if (chdir(dir))
+ die("git-upload-pack unable to chdir to %s", dir);
+ chdir(".git");
+ if (access("objects", X_OK) || access("refs", X_OK))
+ die("git-upload-pack: %s doesn't seem to be a git archive", dir);
+ setenv("GIT_DIR", ".", 1);
+ upload_pack();
+ return 0;
+}