commit - bbc740ac4905ed0d4ba6334f6225c8f8c9f3c394
commit + 3c23f6cdb61cc63d6fd9ecbcc015cd1347793eb1
blob - 3fd06efcdadb789fef14e683086013ed87d5bfd9
blob + f6291e8407d22bd8dea75ff94f8f7b88ebafcb78
--- include/got_error.h
+++ include/got_error.h
@@ -259,6 +259,14 @@ const struct got_error *got_ferror(FILE *, int);
  */
 struct got_object_id; /* forward declaration */
 const struct got_error *got_error_no_obj(struct got_object_id *);
+
+/*
+ * Obtain an error with code GOT_ERR_OBJ_CSUM 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.
+ */
+const struct got_error *got_error_checksum(struct got_object_id *);
 
 /*
  * Obtain an error with code GOT_ERR_NOT_REF and an error message which
blob - 95d7ae9cb011916744442c02343dafa9e4901bb1
blob + 041a41fbd209cbb7d7131b52327e59668eea4f41
--- lib/error.c
+++ lib/error.c
@@ -379,6 +379,24 @@ got_error_no_obj(struct got_object_id *id)
 		return got_error(GOT_ERR_NO_OBJ);
 
 	return got_error_msg(GOT_ERR_NO_OBJ, msg);
+}
+
+const struct got_error *
+got_error_checksum(struct got_object_id *id)
+{
+	char id_str[GOT_OBJECT_ID_HEX_MAXLEN];
+	char msg[sizeof("checksum failure for object ") + sizeof(id_str)];
+	int ret;
+
+	if (!got_object_id_hex(id, id_str, sizeof(id_str)))
+		return got_error(GOT_ERR_OBJ_CSUM);
+
+	ret = snprintf(msg, sizeof(msg), "checksum failure for object %s",
+	    id_str);
+	if (ret < 0 || (size_t)ret >= sizeof(msg))
+		return got_error(GOT_ERR_OBJ_CSUM);
+
+	return got_error_msg(GOT_ERR_OBJ_CSUM, msg);
 }
 
 const struct got_error *
blob - b17d5a9b339c525ac55deed48e604e2b049d96ca
blob + 52fd48d81fd6b40f63ea1b5b40edbb3c8e40b3a2
--- lib/object_parse.c
+++ lib/object_parse.c
@@ -343,11 +343,7 @@ got_object_read_raw(uint8_t **outbuf, off_t *size, siz
 
 	SHA1Final(sha1, &sha1_ctx);
 	if (memcmp(expected_id->sha1, sha1, SHA1_DIGEST_LENGTH) != 0) {
-		char buf[SHA1_DIGEST_STRING_LENGTH];
-		err = got_error_fmt(GOT_ERR_OBJ_CSUM,
-		    "checksum failure for object %s",
-		    got_sha1_digest_to_str(expected_id->sha1, buf,
-		    sizeof(buf)));
+		err = got_error_checksum(expected_id);
 		goto done;
 	}
 
@@ -766,11 +762,7 @@ got_object_read_commit(struct got_commit_object **comm
 
 	SHA1Final(id.sha1, &sha1_ctx);
 	if (got_object_id_cmp(expected_id, &id) != 0) {
-		char buf[SHA1_DIGEST_STRING_LENGTH];
-		err = got_error_fmt(GOT_ERR_OBJ_CSUM,
-		    "checksum failure for object %s",
-		    got_sha1_digest_to_str(expected_id->sha1, buf,
-		    sizeof(buf)));
+		err = got_error_checksum(expected_id);
 		goto done;
 	}
 
@@ -939,11 +931,7 @@ got_object_read_tree(struct got_parsed_tree_entry **en
 
 	SHA1Final(id.sha1, &sha1_ctx);
 	if (got_object_id_cmp(expected_id, &id) != 0) {
-		char buf[SHA1_DIGEST_STRING_LENGTH];
-		err = got_error_fmt(GOT_ERR_OBJ_CSUM,
-		    "checksum failure for object %s",
-		    got_sha1_digest_to_str(expected_id->sha1, buf,
-		    sizeof(buf)));
+		err = got_error_checksum(expected_id);
 		goto done;
 	}
 
@@ -1183,11 +1171,7 @@ got_object_read_tag(struct got_tag_object **tag, int f
 
 	SHA1Final(id.sha1, &sha1_ctx);
 	if (got_object_id_cmp(expected_id, &id) != 0) {
-		char buf[SHA1_DIGEST_STRING_LENGTH];
-		err = got_error_fmt(GOT_ERR_OBJ_CSUM,
-		    "checksum failure for object %s",
-		    got_sha1_digest_to_str(expected_id->sha1, buf,
-		    sizeof(buf)));
+		err = got_error_checksum(expected_id);
 		goto done;
 	}
 
blob - 0f7e7ecca20145a10ab4146b77499313ccdd89ed
blob + 839a953c4f820616b747cbd3fcca9350a558fc68
--- libexec/got-read-blob/got-read-blob.c
+++ libexec/got-read-blob/got-read-blob.c
@@ -38,7 +38,6 @@
 #include "got_lib_object.h"
 #include "got_lib_object_parse.h"
 #include "got_lib_privsep.h"
-#include "got_lib_sha1.h"
 
 static volatile sig_atomic_t sigint_received;
 
@@ -172,11 +171,7 @@ main(int argc, char *argv[])
 		}
 		SHA1Final(id.sha1, &sha1_ctx);
 		if (got_object_id_cmp(&expected_id, &id) != 0) {
-			char buf[SHA1_DIGEST_STRING_LENGTH];
-			err = got_error_fmt(GOT_ERR_OBJ_CSUM,
-			    "checksum failure for object %s",
-			    got_sha1_digest_to_str(expected_id.sha1, buf,
-			    sizeof(buf)));
+			err = got_error_checksum(&expected_id);
 			goto done;
 		}