diff options
Diffstat (limited to 'pull.c')
| -rw-r--r-- | pull.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/pull.c b/pull.c new file mode 100644 index 0000000000..ed3078e3b2 --- /dev/null +++ b/pull.c @@ -0,0 +1,178 @@ +#include "pull.h" + +#include "cache.h" +#include "commit.h" +#include "tree.h" +#include "tag.h" +#include "blob.h" +#include "refs.h" + +const char *write_ref = NULL; + +const unsigned char *current_ref = NULL; + +int get_tree = 0; +int get_history = 0; +int get_all = 0; +int get_verbosely = 0; +static unsigned char current_commit_sha1[20]; + +static const char commitS[] = "commit"; +static const char treeS[] = "tree"; +static const char blobS[] = "blob"; + +void pull_say(const char *fmt, const char *hex) { + if (get_verbosely) + fprintf(stderr, fmt, hex); +} + +static void report_missing(const char *what, const unsigned char *missing) +{ + char missing_hex[41]; + + strcpy(missing_hex, sha1_to_hex(missing));; + fprintf(stderr, + "Cannot obtain needed %s %s\nwhile processing commit %s.\n", + what, missing_hex, sha1_to_hex(current_commit_sha1)); +} + +static int make_sure_we_have_it(const char *what, unsigned char *sha1) +{ + int status = 0; + + if (!has_sha1_file(sha1)) { + status = fetch(sha1); + if (status && what) + report_missing(what, sha1); + } + return status; +} + +static int process_unknown(unsigned char *sha1); + +static int process_tree(unsigned char *sha1) +{ + struct tree *tree = lookup_tree(sha1); + struct tree_entry_list *entries; + + if (parse_tree(tree)) + return -1; + + for (entries = tree->entries; entries; entries = entries->next) { + const char *what = entries->directory ? treeS : blobS; + if (make_sure_we_have_it(what, entries->item.tree->object.sha1)) + return -1; + if (entries->directory) { + if (process_tree(entries->item.tree->object.sha1)) + return -1; + } + } + return 0; +} + +static int process_commit(unsigned char *sha1) +{ + struct commit *obj = lookup_commit(sha1); + + if (make_sure_we_have_it(commitS, sha1)) + return -1; + + if (parse_commit(obj)) + return -1; + + if (get_tree) { + if (make_sure_we_have_it(treeS, obj->tree->object.sha1)) + return -1; + if (process_tree(obj->tree->object.sha1)) + return -1; + if (!get_all) + get_tree = 0; + } + if (get_history) { + struct commit_list *parents = obj->parents; + for (; parents; parents = parents->next) { + if (has_sha1_file(parents->item->object.sha1)) + continue; + if (make_sure_we_have_it(NULL, + parents->item->object.sha1)) { + /* The server might not have it, and + * we don't mind. + */ + continue; + } + if (process_commit(parents->item->object.sha1)) + return -1; + memcpy(current_commit_sha1, sha1, 20); + } + } + return 0; +} + +static int process_tag(unsigned char *sha1) +{ + struct tag *obj = lookup_tag(sha1); + + if (parse_tag(obj)) + return -1; + return process_unknown(obj->tagged->sha1); +} + +static int process_unknown(unsigned char *sha1) +{ + struct object *obj; + if (make_sure_we_have_it("object", sha1)) + return -1; + obj = parse_object(sha1); + if (!obj) + return error("Unable to parse object %s", sha1_to_hex(sha1)); + if (obj->type == commit_type) + return process_commit(sha1); + if (obj->type == tree_type) + return process_tree(sha1); + if (obj->type == blob_type) + return 0; + if (obj->type == tag_type) + return process_tag(sha1); + return error("Unable to determine requirement of type %s for %s", + obj->type, sha1_to_hex(sha1)); +} + +static int interpret_target(char *target, unsigned char *sha1) +{ + if (!get_sha1_hex(target, sha1)) + return 0; + if (!check_ref_format(target)) { + if (!fetch_ref(target, sha1)) { + return 0; + } + } + return -1; +} + + +int pull(char *target) +{ + unsigned char sha1[20]; + int fd = -1; + + if (write_ref && current_ref) { + fd = lock_ref_sha1(write_ref, current_ref); + if (fd < 0) + return -1; + } + + if (interpret_target(target, sha1)) + return error("Could not interpret %s as something to pull", + target); + if (process_unknown(sha1)) + return -1; + + if (write_ref) { + if (current_ref) { + write_ref_sha1(write_ref, fd, sha1); + } else { + write_ref_sha1_unlocked(write_ref, sha1); + } + } + return 0; +} |