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-rw-r--r--connected.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/connected.c b/connected.c
new file mode 100644
index 0000000000..1e89c1cd1d
--- /dev/null
+++ b/connected.c
@@ -0,0 +1,62 @@
+#include "cache.h"
+#include "run-command.h"
+#include "sigchain.h"
+#include "connected.h"
+
+/*
+ * If we feed all the commits we want to verify to this command
+ *
+ * $ git rev-list --objects --stdin --not --all
+ *
+ * and if it does not error out, that means everything reachable from
+ * these commits locally exists and is connected to our existing refs.
+ * Note that this does _not_ validate the individual objects.
+ *
+ * Returns 0 if everything is connected, non-zero otherwise.
+ */
+int check_everything_connected(sha1_iterate_fn fn, int quiet, void *cb_data)
+{
+ struct child_process rev_list;
+ const char *argv[] = {"rev-list", "--objects",
+ "--stdin", "--not", "--all", NULL, NULL};
+ char commit[41];
+ unsigned char sha1[20];
+ int err = 0;
+
+ if (fn(cb_data, sha1))
+ return err;
+
+ if (quiet)
+ argv[5] = "--quiet";
+
+ memset(&rev_list, 0, sizeof(rev_list));
+ rev_list.argv = argv;
+ rev_list.git_cmd = 1;
+ rev_list.in = -1;
+ rev_list.no_stdout = 1;
+ rev_list.no_stderr = quiet;
+ if (start_command(&rev_list))
+ return error(_("Could not run 'git rev-list'"));
+
+ sigchain_push(SIGPIPE, SIG_IGN);
+
+ commit[40] = '\n';
+ do {
+ memcpy(commit, sha1_to_hex(sha1), 40);
+ if (write_in_full(rev_list.in, commit, 41) < 0) {
+ if (errno != EPIPE && errno != EINVAL)
+ error(_("failed write to rev-list: %s"),
+ strerror(errno));
+ err = -1;
+ break;
+ }
+ } while (!fn(cb_data, sha1));
+
+ if (close(rev_list.in)) {
+ error(_("failed to close rev-list's stdin: %s"), strerror(errno));
+ err = -1;
+ }
+
+ sigchain_pop(SIGPIPE);
+ return finish_command(&rev_list) || err;
+}