When walking objects, git-rev-list(1) prints each object entry on a
separate line. Some options, such as `--objects`, may print additional
information about tree and blob object on the same line in the form:
$ git rev-list --objects <rev>
<tree/blob oid> SP [<path>] LF
Note that in this form the SP is appended regardless of whether the tree
or blob object has path information available. Paths containing a
newline are also truncated at the newline.
Introduce the `-z` option for git-rev-list(1) which reformats the output
to use NUL-delimiters between objects and associated info in the
following form:
$ git rev-list -z --objects <rev>
<oid> NUL [path=<path> NUL]
In this form, the start of each record is signaled by an OID entry that
is all hexidecimal and does not contain any '='. Additional path info
from `--objects` is appended to the record as a token/value pair
`path=<path>` as-is without any truncation.
For now, the `--objects` flag is the only options that can be used in
combination with `-z`. In a subsequent commit, NUL-delimited support for
other options is added. Other options that do not make sense when used
in combination with `-z` are rejected.
Signed-off-by: Justin Tobler <jltobler@xxxxxxxxx>
---
Documentation/rev-list-options.adoc | 21 +++++++++++++++++
builtin/rev-list.c | 35 ++++++++++++++++++++++++-----
t/t6000-rev-list-misc.sh | 35 +++++++++++++++++++++++++++++
3 files changed, 86 insertions(+), 5 deletions(-)
diff --git a/Documentation/rev-list-options.adoc b/Documentation/rev-list-options.adoc
index 785c0786e0..aef83813b8 100644
--- a/Documentation/rev-list-options.adoc
+++ b/Documentation/rev-list-options.adoc
@@ -361,6 +361,27 @@ ifdef::git-rev-list[]
--progress=<header>::
Show progress reports on stderr as objects are considered. The
`<header>` text will be printed with each progress update.
+
+-z::
+ Instead of being newline-delimited, each outputted object and its
+ accompanying metadata is delimited using NUL bytes. Output is printed
+ in the following form:
++
+-----------------------------------------------------------------------
+<OID> NUL [<token>=<value> NUL]...
+-----------------------------------------------------------------------
++
+Additional object metadata, such as object paths, is printed using the
+`<token>=<value>` form. Token values are printed as-is without any
+encoding/truncation. An OID entry never contains a '=' character and thus
+is used to signal the start of a new object record. Examples:
++
+-----------------------------------------------------------------------
+<OID> NUL
+<OID> NUL path=<path> NUL
+-----------------------------------------------------------------------
++
+This mode is only compatible with the `--objects` output option.
endif::git-rev-list[]
History Simplification
diff --git a/builtin/rev-list.c b/builtin/rev-list.c
index 04d9c893b5..17de99d9ca 100644
--- a/builtin/rev-list.c
+++ b/builtin/rev-list.c
@@ -65,6 +65,7 @@ static const char rev_list_usage[] =
" --abbrev-commit\n"
" --left-right\n"
" --count\n"
+" -z\n"
" special purpose:\n"
" --bisect\n"
" --bisect-vars\n"
@@ -97,6 +98,9 @@ static int arg_show_object_names = 1;
#define DEFAULT_OIDSET_SIZE (16*1024)
+static char line_term = '\n';
+static char info_term = ' ';
+
static int show_disk_usage;
static off_t total_disk_usage;
static int human_readable;
@@ -264,7 +268,7 @@ static void show_commit(struct commit *commit, void *data)
if (revs->commit_format == CMIT_FMT_ONELINE)
putchar(' ');
else if (revs->include_header)
- putchar('\n');
+ putchar(line_term);
if (revs->verbose_header) {
struct strbuf buf = STRBUF_INIT;
@@ -361,12 +365,16 @@ static void show_object(struct object *obj, const char *name, void *cb_data)
printf("%s", oid_to_hex(&obj->oid));
if (arg_show_object_names) {
- putchar(' ');
- for (const char *p = name; *p && *p != '\n'; p++)
- putchar(*p);
+ if (line_term) {
+ putchar(info_term);
+ for (const char *p = name; *p && *p != '\n'; p++)
+ putchar(*p);
+ } else if (*name) {
+ printf("%cpath=%s", info_term, name);
+ }
}
- putchar('\n');
+ putchar(line_term);
}
static void show_edge(struct commit *commit)
@@ -642,6 +650,9 @@ int cmd_rev_list(int argc,
revs.exclude_promisor_objects = 1;
} else if (skip_prefix(arg, "--missing=", &arg)) {
parse_missing_action_value(arg);
+ } else if (!strcmp(arg, "-z")) {
+ line_term = '\0';
+ info_term = '\0';
}
}
@@ -757,6 +768,20 @@ int cmd_rev_list(int argc,
usage(rev_list_usage);
}
+
+ /*
+ * Reject options currently incompatible with -z. For some options, this
+ * is not an inherent limitation and support may be implemented in the
+ * future.
+ */
+ if (!line_term) {
+ if (revs.graph || revs.verbose_header || show_disk_usage ||
+ info.show_timestamp || info.header_prefix || bisect_list ||
+ use_bitmap_index || revs.edge_hint || revs.left_right ||
+ revs.cherry_mark || arg_missing_action || revs.boundary)
+ die(_("-z option used with unsupported option"));
+ }
+
if (revs.commit_format != CMIT_FMT_USERFORMAT)
revs.include_header = 1;
if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
diff --git a/t/t6000-rev-list-misc.sh b/t/t6000-rev-list-misc.sh
index 6289a2e8b0..886e2fc710 100755
--- a/t/t6000-rev-list-misc.sh
+++ b/t/t6000-rev-list-misc.sh
@@ -182,4 +182,39 @@ test_expect_success 'rev-list --unpacked' '
test_cmp expect actual
'
+test_expect_success 'rev-list -z' '
+ test_when_finished rm -rf repo &&
+
+ git init repo &&
+ test_commit -C repo 1 &&
+ test_commit -C repo 2 &&
+
+ oid1=$(git -C repo rev-parse HEAD~) &&
+ oid2=$(git -C repo rev-parse HEAD) &&
+
+ printf "%s\0%s\0" "$oid2" "$oid1" >expect &&
+ git -C repo rev-list -z HEAD >actual &&
+
+ test_cmp expect actual
+'
+
+test_expect_success 'rev-list -z --objects' '
+ test_when_finished rm -rf repo &&
+
+ git init repo &&
+ test_commit -C repo 1 &&
+ test_commit -C repo 2 &&
+
+ oid1=$(git -C repo rev-parse HEAD:1.t) &&
+ oid2=$(git -C repo rev-parse HEAD:2.t) &&
+ path1=1.t &&
+ path2=2.t &&
+
+ printf "%s\0path=%s\0%s\0path=%s\0" "$oid1" "$path1" "$oid2" "$path2" \
+ >expect &&
+ git -C repo rev-list -z --objects HEAD:1.t HEAD:2.t >actual &&
+
+ test_cmp expect actual
+'
+
test_done
--
2.49.0.rc2
