commit - 80d5f1347d70550d49d95b6420ca27877d1221e8
commit + 91a3d81fcf77040d5c432c86b5d4aebbec565468
blob - 1a82e737da3bdb1b65c894d3ba816343eb9e0910
blob + 5e8cb64e0e52fb1095b802f3386f56fdd3227a08
--- include/got_error.h
+++ include/got_error.h
@@ -123,6 +123,14 @@ static const struct got_error {
 const struct got_error *got_error(int);
 
 /*
+ * Get an error object from the above list, for a given error code.
+ * Use the specified error message instead of the default one.
+ * Caution: If the message buffer lives in dynamically allocated memory,
+ * then this memory likely won't be freed.
+ */
+const struct got_error *got_error_msg(int, const char *);
+
+/*
  * Get a statically allocated error object with code GOT_ERR_ERRNO
  * and an error message obtained from strerror(3).
  */
@@ -141,3 +149,12 @@ const struct got_error *got_error_set_errno(int);
  * with the error code provided in the second argument.
  */
 const struct got_error *got_ferror(FILE *, int);
+
+/*
+ * Obtain an error with code GOT_ERR_NO_OBJ and an error message which
+ * contains the specified object ID. The message buffer is statically
+ * allocated; future invocations of this function will overwrite the
+ * message set during earlier invocations.
+ */
+struct got_object_id; /* forward declaration */
+const struct got_error *got_error_no_obj(struct got_object_id *);
blob - f663cec7fee07256ea7b0f7355b62ceef29f6843
blob + e91da57c2b2b62b9a115c7686001cfa45a0344da
--- lib/commit_graph.c
+++ lib/commit_graph.c
@@ -639,7 +639,7 @@ got_commit_graph_iter_start(struct got_commit_graph *g
 
 	start_node = got_object_idset_get(graph->node_ids, id);
 	if (start_node == NULL)
-		return got_error(GOT_ERR_NO_OBJ);
+		return got_error_no_obj(id);
 
 	err = got_object_open_as_commit(&commit, repo, &start_node->id);
 	if (err)
blob - b12d036c856b9a3528f9e4e08295d75ed88c1186
blob + 7063a0bd26715e78fcf1b95024be382510b2749a
--- lib/error.c
+++ lib/error.c
@@ -14,13 +14,23 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include <sys/queue.h>
+
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sha1.h>
+#include <zlib.h>
 
 #include "got_error.h"
+#include "got_object.h"
 
+#include "got_lib_delta.h"
+#include "got_lib_inflate.h"
+#include "got_lib_object.h"
+#include "got_lib_sha1.h"
+
 #ifndef nitems
 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
 #endif
@@ -39,6 +49,23 @@ got_error(int code)
 }
 
 const struct got_error *
+got_error_msg(int code, const char *msg)
+{
+	static struct got_error err;
+	int i;
+
+	for (i = 0; i < nitems(got_errors); i++) {
+		if (code == got_errors[i].code) {
+			err.code = code;
+			err.msg = msg;
+			return (const struct got_error *)&err;
+		}
+	}
+
+	abort();
+}
+
+const struct got_error *
 got_error_from_errno()
 {
 	static struct got_error err;
@@ -62,3 +89,21 @@ got_ferror(FILE *f, int code)
 		return got_error_from_errno();
 	return got_error(code);
 }
+
+const struct got_error *
+got_error_no_obj(struct got_object_id *id)
+{
+	static char msg[sizeof("object   not found") +
+	    SHA1_DIGEST_STRING_LENGTH];
+	char id_str[SHA1_DIGEST_STRING_LENGTH];
+	int ret;
+
+	if (!got_sha1_digest_to_str(id->sha1, id_str, sizeof(id_str)))
+		return got_error(GOT_ERR_NO_OBJ);
+
+	ret = snprintf(msg, sizeof(msg), "object %s not found", id_str);
+	if (ret == -1 || ret >= sizeof(msg))
+		return got_error(GOT_ERR_NO_OBJ);
+
+	return got_error_msg(GOT_ERR_NO_OBJ, msg);
+}
blob - abcc58ce90a553a46ea4f2b1e67cd05d0477a72a
blob + 97f5a2e4929107697eee79b4a1b2ab8d14c253a5
--- lib/object.c
+++ lib/object.c
@@ -232,7 +232,7 @@ got_object_open(struct got_object **obj, struct got_re
 	fd = open(path, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
 	if (fd == -1) {
 		if (errno == ENOENT)
-			err = got_error(GOT_ERR_NO_OBJ);
+			err = got_error_no_obj(id);
 		else
 			err = got_error_from_errno();
 		goto done;
blob - 42722b721ec198281ab15c50078ff54bffd89521
blob + 3becb1ca45ed5e33df2ffa0843361e63961071ad
--- lib/repository.c
+++ lib/repository.c
@@ -673,7 +673,7 @@ got_repo_search_packidx(struct got_packidx **packidx, 
 			goto done;
 	}
 
-	err = got_error(GOT_ERR_NO_OBJ);
+	err = got_error_no_obj(id);
 done:
 	free(path_packdir);
 	if (packdir && closedir(packdir) != 0 && err == 0)
blob - f6163877e11c2f1998a5e85e51d34ce5b8b71069
blob + 6ac1f2f67f65445533f26f7c05bfc15857d311ec
--- regress/delta/Makefile
+++ regress/delta/Makefile
@@ -1,7 +1,7 @@
 .PATH:${.CURDIR}/../../lib
 
 PROG = delta_test
-SRCS = delta.c error.c opentemp.c path.c inflate.c delta_test.c
+SRCS = delta.c error.c opentemp.c path.c inflate.c sha1.c delta_test.c
 
 CPPFLAGS = -I${.CURDIR}/../../include -I${.CURDIR}/../../lib
 LDADD = -lz