Merge branch 'bw/diff-metainfo-color'
[gitweb.git] / builtin / receive-pack.c
index 0559fcc871894548050e99c8c258561a0dcad5c9..bb34757d27f32fff8cb15a8f99d8295b5e38cb9e 100644 (file)
@@ -9,6 +9,7 @@
 #include "object.h"
 #include "remote.h"
 #include "transport.h"
+#include "string-list.h"
 
 static const char receive_pack_usage[] = "git receive-pack <git-dir>";
 
@@ -129,13 +130,12 @@ static void write_head_info(void)
 struct command {
        struct command *next;
        const char *error_string;
+       unsigned int skip_update;
        unsigned char old_sha1[20];
        unsigned char new_sha1[20];
        char ref_name[FLEX_ARRAY]; /* more */
 };
 
-static struct command *commands;
-
 static const char pre_receive_hook[] = "hooks/pre-receive";
 static const char post_receive_hook[] = "hooks/post-receive";
 
@@ -188,7 +188,7 @@ static int copy_to_sideband(int in, int out, void *arg)
        return 0;
 }
 
-static int run_receive_hook(const char *hook_name)
+static int run_receive_hook(struct command *commands, const char *hook_name)
 {
        static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
        struct command *cmd;
@@ -447,15 +447,15 @@ static const char *update(struct command *cmd)
 
 static char update_post_hook[] = "hooks/post-update";
 
-static void run_update_post_hook(struct command *cmd)
+static void run_update_post_hook(struct command *commands)
 {
-       struct command *cmd_p;
+       struct command *cmd;
        int argc;
        const char **argv;
        struct child_process proc;
 
-       for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
-               if (cmd_p->error_string)
+       for (argc = 0, cmd = commands; cmd; cmd = cmd->next) {
+               if (cmd->error_string)
                        continue;
                argc++;
        }
@@ -464,12 +464,12 @@ static void run_update_post_hook(struct command *cmd)
        argv = xmalloc(sizeof(*argv) * (2 + argc));
        argv[0] = update_post_hook;
 
-       for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
+       for (argc = 1, cmd = commands; cmd; cmd = cmd->next) {
                char *p;
-               if (cmd_p->error_string)
+               if (cmd->error_string)
                        continue;
-               p = xmalloc(strlen(cmd_p->ref_name) + 1);
-               strcpy(p, cmd_p->ref_name);
+               p = xmalloc(strlen(cmd->ref_name) + 1);
+               strcpy(p, cmd->ref_name);
                argv[argc] = p;
                argc++;
        }
@@ -488,37 +488,92 @@ static void run_update_post_hook(struct command *cmd)
        }
 }
 
-static void execute_commands(const char *unpacker_error)
+static void check_aliased_update(struct command *cmd, struct string_list *list)
+{
+       struct string_list_item *item;
+       struct command *dst_cmd;
+       unsigned char sha1[20];
+       char cmd_oldh[41], cmd_newh[41], dst_oldh[41], dst_newh[41];
+       int flag;
+
+       const char *dst_name = resolve_ref(cmd->ref_name, sha1, 0, &flag);
+
+       if (!(flag & REF_ISSYMREF))
+               return;
+
+       if ((item = string_list_lookup(dst_name, list)) == NULL)
+               return;
+
+       cmd->skip_update = 1;
+
+       dst_cmd = (struct command *) item->util;
+
+       if (!hashcmp(cmd->old_sha1, dst_cmd->old_sha1) &&
+           !hashcmp(cmd->new_sha1, dst_cmd->new_sha1))
+               return;
+
+       dst_cmd->skip_update = 1;
+
+       strcpy(cmd_oldh, find_unique_abbrev(cmd->old_sha1, DEFAULT_ABBREV));
+       strcat(cmd_newh, find_unique_abbrev(cmd->new_sha1, DEFAULT_ABBREV));
+       strcpy(dst_oldh, find_unique_abbrev(dst_cmd->old_sha1, DEFAULT_ABBREV));
+       strcat(dst_newh, find_unique_abbrev(dst_cmd->new_sha1, DEFAULT_ABBREV));
+       rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
+                " its target '%s' (%s..%s)",
+                cmd->ref_name, cmd_oldh, cmd_newh,
+                dst_cmd->ref_name, dst_oldh, dst_newh);
+
+       cmd->error_string = dst_cmd->error_string =
+               "inconsistent aliased update";
+}
+
+static void check_aliased_updates(struct command *commands)
+{
+       struct command *cmd;
+       struct string_list ref_list = { NULL, 0, 0, 0 };
+
+       for (cmd = commands; cmd; cmd = cmd->next) {
+               struct string_list_item *item =
+                       string_list_append(cmd->ref_name, &ref_list);
+               item->util = (void *)cmd;
+       }
+       sort_string_list(&ref_list);
+
+       for (cmd = commands; cmd; cmd = cmd->next)
+               check_aliased_update(cmd, &ref_list);
+
+       string_list_clear(&ref_list, 0);
+}
+
+static void execute_commands(struct command *commands, const char *unpacker_error)
 {
-       struct command *cmd = commands;
+       struct command *cmd;
        unsigned char sha1[20];
 
        if (unpacker_error) {
-               while (cmd) {
+               for (cmd = commands; cmd; cmd = cmd->next)
                        cmd->error_string = "n/a (unpacker error)";
-                       cmd = cmd->next;
-               }
                return;
        }
 
-       if (run_receive_hook(pre_receive_hook)) {
-               while (cmd) {
+       if (run_receive_hook(commands, pre_receive_hook)) {
+               for (cmd = commands; cmd; cmd = cmd->next)
                        cmd->error_string = "pre-receive hook declined";
-                       cmd = cmd->next;
-               }
                return;
        }
 
+       check_aliased_updates(commands);
+
        head_name = resolve_ref("HEAD", sha1, 0, NULL);
 
-       while (cmd) {
-               cmd->error_string = update(cmd);
-               cmd = cmd->next;
-       }
+       for (cmd = commands; cmd; cmd = cmd->next)
+               if (!cmd->skip_update)
+                       cmd->error_string = update(cmd);
 }
 
-static void read_head_info(void)
+static struct command *read_head_info(void)
 {
+       struct command *commands = NULL;
        struct command **p = &commands;
        for (;;) {
                static char line[1000];
@@ -548,15 +603,14 @@ static void read_head_info(void)
                        if (strstr(refname + reflen + 1, "side-band-64k"))
                                use_sideband = LARGE_PACKET_MAX;
                }
-               cmd = xmalloc(sizeof(struct command) + len - 80);
+               cmd = xcalloc(1, sizeof(struct command) + len - 80);
                hashcpy(cmd->old_sha1, old_sha1);
                hashcpy(cmd->new_sha1, new_sha1);
                memcpy(cmd->ref_name, line + 82, len - 81);
-               cmd->error_string = NULL;
-               cmd->next = NULL;
                *p = cmd;
                p = &cmd->next;
        }
+       return commands;
 }
 
 static const char *parse_pack_header(struct pack_header *hdr)
@@ -643,7 +697,7 @@ static const char *unpack(void)
        }
 }
 
-static void report(const char *unpack_status)
+static void report(struct command *commands, const char *unpack_status)
 {
        struct command *cmd;
        struct strbuf buf = STRBUF_INIT;
@@ -667,12 +721,12 @@ static void report(const char *unpack_status)
        strbuf_release(&buf);
 }
 
-static int delete_only(struct command *cmd)
+static int delete_only(struct command *commands)
 {
-       while (cmd) {
+       struct command *cmd;
+       for (cmd = commands; cmd; cmd = cmd->next) {
                if (!is_null_sha1(cmd->new_sha1))
                        return 0;
-               cmd = cmd->next;
        }
        return 1;
 }
@@ -722,6 +776,7 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
        int stateless_rpc = 0;
        int i;
        char *dir = NULL;
+       struct command *commands;
 
        argv++;
        for (i = 1; i < argc; i++) {
@@ -772,18 +827,17 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
        if (advertise_refs)
                return 0;
 
-       read_head_info();
-       if (commands) {
+       if ((commands = read_head_info()) != NULL) {
                const char *unpack_status = NULL;
 
                if (!delete_only(commands))
                        unpack_status = unpack();
-               execute_commands(unpack_status);
+               execute_commands(commands, unpack_status);
                if (pack_lockfile)
                        unlink_or_warn(pack_lockfile);
                if (report_status)
-                       report(unpack_status);
-               run_receive_hook(post_receive_hook);
+                       report(commands, unpack_status);
+               run_receive_hook(commands, post_receive_hook);
                run_update_post_hook(commands);
                if (auto_gc) {
                        const char *argv_gc_auto[] = {