commit 27793341b019f82d415b7a38f106a5424a3d2ecb
from: Stefan Sperling <stsp@stsp.name>
date: Sat Jan 12 17:58:04 2019 UTC

introduce special error code for a corrupt file index

commit - 8da9e5f4a4b7b369d617fdceb6e9b715f8d6d121
commit + 27793341b019f82d415b7a38f106a5424a3d2ecb
blob - 34bd324b68b53131fb06adc2a13b17f6a601bc78
blob + 798180a9e9eb5eb4fab5229324c634c309f2baca
--- include/got_error.h
+++ include/got_error.h
@@ -69,6 +69,7 @@
 #define GOT_ERR_FILEIDX_CSUM	53
 #define GOT_ERR_PATH_PREFIX	54
 #define GOT_ERR_ANCESTRY	55
+#define GOT_ERR_FILEIDX_BAD	56
 
 static const struct got_error {
 	int code;
@@ -128,6 +129,7 @@ static const struct got_error {
 				"different path prefix" },
 	{ GOT_ERR_ANCESTRY,	"specified commit does not share ancestry with "
 				"the current branch" },
+	{ GOT_ERR_FILEIDX_BAD,	"file index is corrupt" },
 };
 
 /*
blob - dd1d1db9598a09e3df467644273c623ca483d674
blob + b3b7b356254d4d7892f5ebfce76f811fbccf2813
--- lib/fileindex.c
+++ lib/fileindex.c
@@ -329,7 +329,7 @@ read_fileindex_val64(uint64_t *val, SHA1_CTX *ctx, FIL
 
 	n = fread(val, 1, sizeof(*val), infile);
 	if (n != sizeof(*val))
-		return got_ferror(infile, GOT_ERR_IO);
+		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
 	SHA1Update(ctx, (uint8_t *)val, sizeof(*val));
 	*val = be64toh(*val);
 	return NULL;
@@ -342,7 +342,7 @@ read_fileindex_val32(uint32_t *val, SHA1_CTX *ctx, FIL
 
 	n = fread(val, 1, sizeof(*val), infile);
 	if (n != sizeof(*val))
-		return got_ferror(infile, GOT_ERR_IO);
+		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
 	SHA1Update(ctx, (uint8_t *)val, sizeof(*val));
 	*val = be32toh(*val);
 	return NULL;
@@ -355,7 +355,7 @@ read_fileindex_val16(uint16_t *val, SHA1_CTX *ctx, FIL
 
 	n = fread(val, 1, sizeof(*val), infile);
 	if (n != sizeof(*val))
-		return got_ferror(infile, GOT_ERR_IO);
+		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
 	SHA1Update(ctx, (uint8_t *)val, sizeof(*val));
 	*val = be16toh(*val);
 	return NULL;
@@ -375,7 +375,7 @@ read_fileindex_path(char **path, SHA1_CTX *ctx, FILE *
 	do {
 		n = fread(buf, 1, sizeof(buf), infile);
 		if (n != sizeof(buf))
-			return got_ferror(infile, GOT_ERR_IO);
+			return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
 		if (len + sizeof(buf) > totlen) {
 			char *p = reallocarray(*path, totlen + sizeof(buf), 1);
 			if (p == NULL) {
@@ -440,14 +440,14 @@ read_fileindex_entry(struct got_fileindex_entry **entr
 
 	n = fread(entry->blob_sha1, 1, SHA1_DIGEST_LENGTH, infile);
 	if (n != SHA1_DIGEST_LENGTH) {
-		err = got_ferror(infile, GOT_ERR_IO);
+		err = got_ferror(infile, GOT_ERR_FILEIDX_BAD);
 		goto done;
 	}
 	SHA1Update(ctx, entry->blob_sha1, SHA1_DIGEST_LENGTH);
 
 	n = fread(entry->commit_sha1, 1, SHA1_DIGEST_LENGTH, infile);
 	if (n != SHA1_DIGEST_LENGTH) {
-		err = got_ferror(infile, GOT_ERR_IO);
+		err = got_ferror(infile, GOT_ERR_FILEIDX_BAD);
 		goto done;
 	}
 	SHA1Update(ctx, entry->commit_sha1, SHA1_DIGEST_LENGTH);
@@ -486,7 +486,7 @@ got_fileindex_read(struct got_fileindex *fileindex, FI
 	if (n != len) {
 		if (n == 0) /* EOF */
 			return NULL;
-		return got_ferror(infile, GOT_ERR_IO);
+		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
 	}
 
 	SHA1Update(&ctx, buf, len);
@@ -512,7 +512,7 @@ got_fileindex_read(struct got_fileindex *fileindex, FI
 
 	n = fread(sha1_expected, 1, sizeof(sha1_expected), infile);
 	if (n != sizeof(sha1_expected))
-		return got_ferror(infile, GOT_ERR_IO);
+		return got_ferror(infile, GOT_ERR_FILEIDX_BAD);
 	SHA1Final(sha1, &ctx);
 	if (memcmp(sha1, sha1_expected, SHA1_DIGEST_LENGTH) != 0)
 		return got_error(GOT_ERR_FILEIDX_CSUM);