From 680955702990c1d4bfb3c6feed6ae9c6cb5c3c07 Mon Sep 17 00:00:00 2001 From: Christian Couder Date: Fri, 23 Jan 2009 10:06:53 +0100 Subject: replace_object: add mechanism to replace objects found in "refs/replace/" The code implementing this mechanism has been copied more-or-less from the commit graft code. This mechanism is used in "read_sha1_file". sha1 passed to this function that match a ref name in "refs/replace/" are replaced by the sha1 that has been read in the ref. We "die" if the replacement recursion depth is too high or if we can't read the replacement object. Signed-off-by: Christian Couder Signed-off-by: Junio C Hamano --- replace_object.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) create mode 100644 replace_object.c (limited to 'replace_object.c') diff --git a/replace_object.c b/replace_object.c new file mode 100644 index 0000000000..b23e1cd52a --- /dev/null +++ b/replace_object.c @@ -0,0 +1,111 @@ +#include "cache.h" +#include "sha1-lookup.h" +#include "refs.h" + +static struct replace_object { + unsigned char sha1[2][20]; +} **replace_object; + +static int replace_object_alloc, replace_object_nr; + +static const unsigned char *replace_sha1_access(size_t index, void *table) +{ + struct replace_object **replace = table; + return replace[index]->sha1[0]; +} + +static int replace_object_pos(const unsigned char *sha1) +{ + return sha1_pos(sha1, replace_object, replace_object_nr, + replace_sha1_access); +} + +static int register_replace_object(struct replace_object *replace, + int ignore_dups) +{ + int pos = replace_object_pos(replace->sha1[0]); + + if (0 <= pos) { + if (ignore_dups) + free(replace); + else { + free(replace_object[pos]); + replace_object[pos] = replace; + } + return 1; + } + pos = -pos - 1; + if (replace_object_alloc <= ++replace_object_nr) { + replace_object_alloc = alloc_nr(replace_object_alloc); + replace_object = xrealloc(replace_object, + sizeof(*replace_object) * + replace_object_alloc); + } + if (pos < replace_object_nr) + memmove(replace_object + pos + 1, + replace_object + pos, + (replace_object_nr - pos - 1) * + sizeof(*replace_object)); + replace_object[pos] = replace; + return 0; +} + +static int register_replace_ref(const char *refname, + const unsigned char *sha1, + int flag, void *cb_data) +{ + /* Get sha1 from refname */ + const char *slash = strrchr(refname, '/'); + const char *hash = slash ? slash + 1 : refname; + struct replace_object *repl_obj = xmalloc(sizeof(*repl_obj)); + + if (strlen(hash) != 40 || get_sha1_hex(hash, repl_obj->sha1[0])) { + free(repl_obj); + warning("bad replace ref name: %s", refname); + return 0; + } + + /* Copy sha1 from the read ref */ + hashcpy(repl_obj->sha1[1], sha1); + + /* Register new object */ + if (register_replace_object(repl_obj, 1)) + die("duplicate replace ref: %s", refname); + + return 0; +} + +static void prepare_replace_object(void) +{ + static int replace_object_prepared; + + if (replace_object_prepared) + return; + + for_each_replace_ref(register_replace_ref, NULL); + replace_object_prepared = 1; +} + +/* We allow "recursive" replacement. Only within reason, though */ +#define MAXREPLACEDEPTH 5 + +const unsigned char *lookup_replace_object(const unsigned char *sha1) +{ + int pos, depth = MAXREPLACEDEPTH; + const unsigned char *cur = sha1; + + prepare_replace_object(); + + /* Try to recursively replace the object */ + do { + if (--depth < 0) + die("replace depth too high for object %s", + sha1_to_hex(sha1)); + + pos = replace_object_pos(cur); + if (0 <= pos) + cur = replace_object[pos]->sha1[1]; + } while (0 <= pos); + + return cur; +} -- cgit v1.2.1 From dae556bdb1e2ad6fb5eafe82e975bde01029fca9 Mon Sep 17 00:00:00 2001 From: Christian Couder Date: Fri, 23 Jan 2009 10:07:46 +0100 Subject: environment: add global variable to disable replacement This new "read_replace_refs" global variable is set to 1 by default, so that replace refs are used by default. But reachability traversal and packing commands ("cmd_fsck", "cmd_prune", "cmd_pack_objects", "upload_pack", "cmd_unpack_objects") set it to 0, as they must work with the original DAG. Signed-off-by: Christian Couder Signed-off-by: Junio C Hamano --- replace_object.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'replace_object.c') diff --git a/replace_object.c b/replace_object.c index b23e1cd52a..eb59604fd3 100644 --- a/replace_object.c +++ b/replace_object.c @@ -94,6 +94,9 @@ const unsigned char *lookup_replace_object(const unsigned char *sha1) int pos, depth = MAXREPLACEDEPTH; const unsigned char *cur = sha1; + if (!read_replace_refs) + return sha1; + prepare_replace_object(); /* Try to recursively replace the object */ -- cgit v1.2.1 From c2e86addb86689306b992065328ec52aa2479658 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Tue, 22 Mar 2011 00:51:05 -0700 Subject: Fix sparse warnings Fix warnings from 'make check'. - These files don't include 'builtin.h' causing sparse to complain that cmd_* isn't declared: builtin/clone.c:364, builtin/fetch-pack.c:797, builtin/fmt-merge-msg.c:34, builtin/hash-object.c:78, builtin/merge-index.c:69, builtin/merge-recursive.c:22 builtin/merge-tree.c:341, builtin/mktag.c:156, builtin/notes.c:426 builtin/notes.c:822, builtin/pack-redundant.c:596, builtin/pack-refs.c:10, builtin/patch-id.c:60, builtin/patch-id.c:149, builtin/remote.c:1512, builtin/remote-ext.c:240, builtin/remote-fd.c:53, builtin/reset.c:236, builtin/send-pack.c:384, builtin/unpack-file.c:25, builtin/var.c:75 - These files have symbols which should be marked static since they're only file scope: submodule.c:12, diff.c:631, replace_object.c:92, submodule.c:13, submodule.c:14, trace.c:78, transport.c:195, transport-helper.c:79, unpack-trees.c:19, url.c:3, url.c:18, url.c:104, url.c:117, url.c:123, url.c:129, url.c:136, thread-utils.c:21, thread-utils.c:48 - These files redeclare symbols to be different types: builtin/index-pack.c:210, parse-options.c:564, parse-options.c:571, usage.c:49, usage.c:58, usage.c:63, usage.c:72 - These files use a literal integer 0 when they really should use a NULL pointer: daemon.c:663, fast-import.c:2942, imap-send.c:1072, notes-merge.c:362 While we're in the area, clean up some unused #includes in builtin files (mostly exec_cmd.h). Signed-off-by: Stephen Boyd Signed-off-by: Junio C Hamano --- replace_object.c | 1 + 1 file changed, 1 insertion(+) (limited to 'replace_object.c') diff --git a/replace_object.c b/replace_object.c index eb59604fd3..7c6c7544ad 100644 --- a/replace_object.c +++ b/replace_object.c @@ -1,6 +1,7 @@ #include "cache.h" #include "sha1-lookup.h" #include "refs.h" +#include "commit.h" static struct replace_object { unsigned char sha1[2][20]; -- cgit v1.2.1