From bf8b1e04ffa3bb6c64bb8ae50ec825b128ef957d Mon Sep 17 00:00:00 2001 From: Jeff King Date: Sat, 4 Mar 2023 05:26:14 -0500 Subject: [PATCH] bundle: let "-" mean stdin for reading operations For writing, "bundle create -" indicates that the bundle should be written to stdout. But there's no matching handling of "-" for reading operations. This is inconsistent, and a little inflexible (though one can always use "/dev/stdin" on systems that support it). However, it's easy to change. Once upon a time, the bundle-reading code required a seekable descriptor, but that was fixed long ago in e9ee84cf28b (bundle: allowing to read from an unseekable fd, 2011-10-13). So we just need to handle "-" explicitly when opening the file. We _could_ do this by handling "-" in read_bundle_header(), which the reading functions all call already. But that is probably a bad idea. It's also used by low-level code like the transport functions, and we may want to be more careful there. We do not know that stdin is even available to us, and certainly we would not want to get confused by a configured URL that happens to point to "-". So instead, let's add a helper to builtin/bundle.c. Since both the bundle code and some of the callers refer to the bundle by name for error messages, let's use the string "" to make the output a bit nicer to read. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- builtin/bundle.c | 26 ++++++++++++++++++++++---- t/t6020-bundle-misc.sh | 15 +++++++++++++++ 2 files changed, 37 insertions(+), 4 deletions(-) diff --git a/builtin/bundle.c b/builtin/bundle.c index acceef6200..02dab1cfa0 100644 --- a/builtin/bundle.c +++ b/builtin/bundle.c @@ -107,6 +107,23 @@ static int cmd_bundle_create(int argc, const char **argv, const char *prefix) { return ret; } +/* + * Similar to read_bundle_header(), but handle "-" as stdin. + */ +static int open_bundle(const char *path, struct bundle_header *header, + const char **name) +{ + if (!strcmp(path, "-")) { + if (name) + *name = ""; + return read_bundle_header_fd(0, header, ""); + } + + if (name) + *name = path; + return read_bundle_header(path, header); +} + static int cmd_bundle_verify(int argc, const char **argv, const char *prefix) { struct bundle_header header = BUNDLE_HEADER_INIT; int bundle_fd = -1; @@ -118,12 +135,13 @@ static int cmd_bundle_verify(int argc, const char **argv, const char *prefix) { OPT_END() }; char *bundle_file; + const char *name; argc = parse_options_cmd_bundle(argc, argv, prefix, builtin_bundle_verify_usage, options, &bundle_file); /* bundle internals use argv[1] as further parameters */ - if ((bundle_fd = read_bundle_header(bundle_file, &header)) < 0) { + if ((bundle_fd = open_bundle(bundle_file, &header, &name)) < 0) { ret = 1; goto cleanup; } @@ -134,7 +152,7 @@ static int cmd_bundle_verify(int argc, const char **argv, const char *prefix) { goto cleanup; } - fprintf(stderr, _("%s is okay\n"), bundle_file); + fprintf(stderr, _("%s is okay\n"), name); ret = 0; cleanup: free(bundle_file); @@ -155,7 +173,7 @@ static int cmd_bundle_list_heads(int argc, const char **argv, const char *prefix builtin_bundle_list_heads_usage, options, &bundle_file); /* bundle internals use argv[1] as further parameters */ - if ((bundle_fd = read_bundle_header(bundle_file, &header)) < 0) { + if ((bundle_fd = open_bundle(bundle_file, &header, NULL)) < 0) { ret = 1; goto cleanup; } @@ -185,7 +203,7 @@ static int cmd_bundle_unbundle(int argc, const char **argv, const char *prefix) builtin_bundle_unbundle_usage, options, &bundle_file); /* bundle internals use argv[1] as further parameters */ - if ((bundle_fd = read_bundle_header(bundle_file, &header)) < 0) { + if ((bundle_fd = open_bundle(bundle_file, &header, NULL)) < 0) { ret = 1; goto cleanup; } diff --git a/t/t6020-bundle-misc.sh b/t/t6020-bundle-misc.sh index 3a1cf30b1d..063e8ce6b4 100755 --- a/t/t6020-bundle-misc.sh +++ b/t/t6020-bundle-misc.sh @@ -566,4 +566,19 @@ test_expect_success 'cloning from filtered bundle has useful error' ' grep "cannot clone from filtered bundle" err ' +test_expect_success 'read bundle over stdin' ' + git bundle create some.bundle HEAD && + + git bundle verify - err && + grep " is okay" err && + + git bundle list-heads some.bundle >expect && + git bundle list-heads - actual && + test_cmp expect actual && + + git bundle unbundle some.bundle >expect && + git bundle unbundle - actual && + test_cmp expect actual +' + test_done -- 2.39.5