diff options
| -rw-r--r-- | http-push.c | 219 |
1 files changed, 218 insertions, 1 deletions
diff --git a/http-push.c b/http-push.c index 42b0d59..e44310f 100644 --- a/http-push.c +++ b/http-push.c @@ -7,6 +7,7 @@ #include "http.h" #include "refs.h" #include "revision.h" +#include "exec_cmd.h" #include <expat.h> @@ -32,6 +33,7 @@ enum XML_Status { #define DAV_PROPFIND "PROPFIND" #define DAV_PUT "PUT" #define DAV_UNLOCK "UNLOCK" +#define DAV_DELETE "DELETE" /* DAV lock flags */ #define DAV_PROP_LOCKWR (1u << 0) @@ -64,6 +66,9 @@ enum XML_Status { #define FETCHING (1u << 7) #define PUSHING (1u << 8) +/* We allow "recursive" symbolic refs. Only within reason, though */ +#define MAXDEPTH 5 + static int pushing = 0; static int aborted = 0; static char remote_dir_exists[256]; @@ -2103,6 +2108,197 @@ static int remote_exists(const char *path) return -1; } +static void fetch_symref(char *path, char **symref, unsigned char *sha1) +{ + char *url; + struct buffer buffer; + struct active_request_slot *slot; + struct slot_results results; + + url = xmalloc(strlen(remote->url) + strlen(path) + 1); + sprintf(url, "%s%s", remote->url, path); + + buffer.size = 4096; + buffer.posn = 0; + buffer.buffer = xmalloc(buffer.size); + + slot = get_active_slot(); + slot->results = &results; + curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer); + curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer); + curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL); + curl_easy_setopt(slot->curl, CURLOPT_URL, url); + if (start_active_slot(slot)) { + run_active_slot(slot); + if (results.curl_result != CURLE_OK) { + die("Couldn't get %s for remote symref\n%s", + url, curl_errorstr); + } + } else { + die("Unable to start remote symref request"); + } + free(url); + + if (*symref != NULL) + free(*symref); + *symref = NULL; + memset(sha1, 0, 20); + + if (buffer.posn == 0) + return; + + /* If it's a symref, set the refname; otherwise try for a sha1 */ + if (!strncmp((char *)buffer.buffer, "ref: ", 5)) { + *symref = xcalloc(buffer.posn - 5, 1); + strncpy(*symref, (char *)buffer.buffer + 5, buffer.posn - 6); + } else { + get_sha1_hex(buffer.buffer, sha1); + } + + free(buffer.buffer); +} + +static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1) +{ + int pipe_fd[2]; + pid_t merge_base_pid; + char line[PATH_MAX + 20]; + unsigned char merge_sha1[20]; + int verified = 0; + + if (pipe(pipe_fd) < 0) + die("Verify merge base: pipe failed"); + + merge_base_pid = fork(); + if (!merge_base_pid) { + static const char *args[] = { + "merge-base", + "-a", + NULL, + NULL, + NULL + }; + args[2] = strdup(sha1_to_hex(head_sha1)); + args[3] = sha1_to_hex(branch_sha1); + + dup2(pipe_fd[1], 1); + close(pipe_fd[0]); + close(pipe_fd[1]); + execv_git_cmd(args); + die("merge-base setup failed"); + } + if (merge_base_pid < 0) + die("merge-base fork failed"); + + dup2(pipe_fd[0], 0); + close(pipe_fd[0]); + close(pipe_fd[1]); + while (fgets(line, sizeof(line), stdin) != NULL) { + if (get_sha1_hex(line, merge_sha1)) + die("expected sha1, got garbage:\n %s", line); + if (!memcmp(branch_sha1, merge_sha1, 20)) { + verified = 1; + break; + } + } + + return verified; +} + +static int delete_remote_branch(char *pattern, int force) +{ + struct ref *refs = remote_refs; + struct ref *remote_ref = NULL; + unsigned char head_sha1[20]; + char *symref = NULL; + int match; + int patlen = strlen(pattern); + int i; + struct active_request_slot *slot; + struct slot_results results; + char *url; + + /* Find the remote branch(es) matching the specified branch name */ + for (match = 0; refs; refs = refs->next) { + char *name = refs->name; + int namelen = strlen(name); + if (namelen < patlen || + memcmp(name + namelen - patlen, pattern, patlen)) + continue; + if (namelen != patlen && name[namelen - patlen - 1] != '/') + continue; + match++; + remote_ref = refs; + } + if (match == 0) + return error("No remote branch matches %s", pattern); + if (match != 1) + return error("More than one remote branch matches %s", + pattern); + + /* + * Remote HEAD must be a symref (not exactly foolproof; a remote + * symlink to a symref will look like a symref) + */ + fetch_symref("HEAD", &symref, head_sha1); + if (!symref) + return error("Remote HEAD is not a symref"); + + /* Remote branch must not be the remote HEAD */ + for (i=0; symref && i<MAXDEPTH; i++) { + if (!strcmp(remote_ref->name, symref)) + return error("Remote branch %s is the current HEAD", + remote_ref->name); + fetch_symref(symref, &symref, head_sha1); + } + + /* Run extra sanity checks if delete is not forced */ + if (!force) { + /* Remote HEAD must resolve to a known object */ + if (symref) + return error("Remote HEAD symrefs too deep"); + if (is_zero_sha1(head_sha1)) + return error("Unable to resolve remote HEAD"); + if (!has_sha1_file(head_sha1)) + return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1)); + + /* Remote branch must resolve to a known object */ + if (is_zero_sha1(remote_ref->old_sha1)) + return error("Unable to resolve remote branch %s", + remote_ref->name); + if (!has_sha1_file(remote_ref->old_sha1)) + return error("Remote branch %s resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", remote_ref->name, sha1_to_hex(remote_ref->old_sha1)); + + /* Remote branch must be an ancestor of remote HEAD */ + if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) { + return error("The branch '%s' is not a strict subset of your current HEAD.\nIf you are sure you want to delete it, run:\n\t'git http-push -D %s %s'", remote_ref->name, remote->url, pattern); + } + } + + /* Send delete request */ + fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name); + url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1); + sprintf(url, "%s%s", remote->url, remote_ref->name); + slot = get_active_slot(); + slot->results = &results; + curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); + curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null); + curl_easy_setopt(slot->curl, CURLOPT_URL, url); + curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE); + if (start_active_slot(slot)) { + run_active_slot(slot); + free(url); + if (results.curl_result != CURLE_OK) + return error("DELETE request failed (%d/%ld)\n", + results.curl_result, results.http_code); + } else { + free(url); + return error("Unable to start DELETE request"); + } + + return 0; +} + int main(int argc, char **argv) { struct transfer_request *request; @@ -2112,6 +2308,8 @@ int main(int argc, char **argv) struct remote_lock *ref_lock = NULL; struct remote_lock *info_ref_lock = NULL; struct rev_info revs; + int delete_branch = 0; + int force_delete = 0; int objects_to_send; int rc = 0; int i; @@ -2138,7 +2336,15 @@ int main(int argc, char **argv) push_verbosely = 1; continue; } - usage(http_push_usage); + if (!strcmp(arg, "-d")) { + delete_branch = 1; + continue; + } + if (!strcmp(arg, "-D")) { + delete_branch = 1; + force_delete = 1; + continue; + } } if (!remote->url) { remote->url = arg; @@ -2158,6 +2364,9 @@ int main(int argc, char **argv) if (!remote->url) usage(http_push_usage); + if (delete_branch && nr_refspec != 1) + die("You must specify only one branch name when deleting a remote branch"); + memset(remote_dir_exists, -1, 256); http_init(); @@ -2193,6 +2402,14 @@ int main(int argc, char **argv) fprintf(stderr, "Fetching remote heads...\n"); get_dav_remote_heads(); + /* Remove a remote branch if -d or -D was specified */ + if (delete_branch) { + if (delete_remote_branch(refspec[0], force_delete) == -1) + fprintf(stderr, "Unable to delete remote branch %s\n", + refspec[0]); + goto cleanup; + } + /* match them up */ if (!remote_tail) remote_tail = &remote_refs; |