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delta: Support filtering what type of deltas to show

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Not everyone is interested in every kind of deltas (and some might
even be interested knowing which files do not have overrides), so this
here is an implementation of a --type=LIST... option for
systemd-delta, that makes it possible to filter what subset of deltas
we want.

The available modifiers are masked, equivalent, redirected, overriden,
and unchanged - they should be self explanatory, and the man page
explains them in a little more detail anyway.

As a side effect, in case of overriden files, the diff output was made
optional.

By default, everything is shown (with a diff, if appropriate) except
for completely unchanged files.

Signed-off-by: Gergely Nagy <algernon@balabit.hu>
This commit is contained in:
Gergely Nagy 2012-05-16 18:11:27 +02:00 committed by Lennart Poettering
parent 3ea6e73287
commit 807f464522
2 changed files with 183 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
man/systemd-delta.xml
View File

@ -99,6 +99,66 @@
pager.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--type=</option></term>
<term><option>-t</option></term>
<listitem><para>When listing the
differences, only list those that are
asked for. The list itself is a
comma-separated list of desired
difference types.</para>
<para>Recognised types are:
<variablelist>
<varlistentry>
<term><varname>masked</varname></term>
<listitem><para>Show masked files</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>equivalent</varname></term>
<listitem><para>Show overriden
files that while overriden, do
not differ in content.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>redirected</varname></term>
<listitem><para>Show files that
are redirected to another.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>overriden</varname></term>
<listitem><para>Show overriden,
and changed files.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>unchanged</varname></term>
<listitem><para>Show unmodified
files too.</para></listitem>
</varlistentry>
</variablelist>
</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--diff=</option></term>
<listitem><para>When showing modified
files, when a file is overriden show a
diff aswell. This option takes a
boolean argument.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>

139
src/delta/delta.c
View File

@ -55,7 +55,57 @@ static int equivalent(const char *a, const char *b) {
return r;
}
static int found_override(const char *top, const char *bottom) {
#define SHOW_MASKED 1 << 0
#define SHOW_EQUIV 1 << 1
#define SHOW_REDIR 1 << 2
#define SHOW_OVERRIDEN 1 << 3
#define SHOW_UNCHANGED 1 << 4
#define SHOW_DIFF 1 << 5
#define SHOW_DEFAULTS \
(SHOW_MASKED | SHOW_EQUIV | SHOW_REDIR | SHOW_OVERRIDEN | SHOW_DIFF)
static int notify_override_masked(int flags, const char *top, const char *bottom) {
if (!(flags & SHOW_MASKED))
return 0;
printf(ANSI_HIGHLIGHT_RED_ON "[MASK]" ANSI_HIGHLIGHT_OFF " %s → %s\n", top, bottom);
return 1;
}
static int notify_override_equiv(int flags, const char *top, const char *bottom) {
if (!(flags & SHOW_EQUIV))
return 0;
printf(ANSI_HIGHLIGHT_GREEN_ON "[EQUIVALENT]" ANSI_HIGHLIGHT_OFF " %s → %s\n", top, bottom);
return 1;
}
static int notify_override_redir(int flags, const char *top, const char *bottom) {
if (!(flags & SHOW_REDIR))
return 0;
printf(ANSI_HIGHLIGHT_ON "[REDIRECT]" ANSI_HIGHLIGHT_OFF " %s → %s\n", top, bottom);
return 1;
}
static int notify_override_overriden(int flags, const char *top, const char *bottom) {
if (!(flags & SHOW_OVERRIDEN))
return 0;
printf(ANSI_HIGHLIGHT_ON "[OVERRIDE]" ANSI_HIGHLIGHT_OFF " %s → %s\n", top, bottom);
return 1;
}
static int notify_override_unchanged(int flags, const char *top, const char *bottom) {
if (!(flags & SHOW_UNCHANGED))
return 0;
printf(ANSI_HIGHLIGHT_ON "[UNCHANGED]" ANSI_HIGHLIGHT_OFF " %s → %s\n", top, bottom);
return 1;
}
static int found_override(int flags, const char *top, const char *bottom) {
char *dest;
int k;
pid_t pid;
@ -64,22 +114,24 @@ static int found_override(const char *top, const char *bottom) {
assert(bottom);
if (null_or_empty_path(top) > 0) {
printf(ANSI_HIGHLIGHT_RED_ON "[MASK]" ANSI_HIGHLIGHT_OFF " %s → %s\n", top, bottom);
notify_override_masked(flags, top, bottom);
goto finish;
}
k = readlink_malloc(top, &dest);
if (k >= 0) {
if (equivalent(dest, bottom) > 0)
printf(ANSI_HIGHLIGHT_GREEN_ON "[EQUIVALENT]" ANSI_HIGHLIGHT_OFF " %s → %s\n", top, bottom);
notify_override_equiv(flags, top, bottom);
else
printf(ANSI_HIGHLIGHT_ON "[REDIRECT]" ANSI_HIGHLIGHT_OFF " %s → %s\n", top, bottom);
notify_override_redir(flags, top, bottom);
free(dest);
goto finish;
}
printf(ANSI_HIGHLIGHT_ON "[OVERRIDE]" ANSI_HIGHLIGHT_OFF " %s → %s\n", top, bottom);
notify_override_overriden(flags, top, bottom);
if (!(flags & SHOW_DIFF))
goto finish;
putchar('\n');
@ -174,7 +226,7 @@ finish:
return r;
}
static int process_suffix(const char *prefixes, const char *suffix) {
static int process_suffix(int flags, const char *prefixes, const char *suffix) {
const char *p;
char *f;
Hashmap *top, *bottom;
@ -220,10 +272,12 @@ static int process_suffix(const char *prefixes, const char *suffix) {
o = hashmap_get(bottom, path_get_file_name(f));
assert(o);
if (path_equal(o, f))
if (path_equal(o, f)) {
notify_override_unchanged(flags, f, o);
continue;
}
k = found_override(f, o);
k = found_override(flags, f, o);
if (k < 0)
r = k;
@ -239,21 +293,21 @@ finish:
return r < 0 ? r : n_found;
}
static int process_suffix_chop(const char *prefixes, const char *suffix) {
static int process_suffix_chop(int flags, const char *prefixes, const char *suffix) {
const char *p;
assert(prefixes);
assert(suffix);
if (!path_is_absolute(suffix))
return process_suffix(prefixes, suffix);
return process_suffix(flags, prefixes, suffix);
/* Strip prefix from the suffix */
NULSTR_FOREACH(p, prefixes) {
if (startswith(suffix, p)) {
suffix += strlen(p);;
suffix += strspn(suffix, "/");
return process_suffix(prefixes, suffix);
return process_suffix(flags, prefixes, suffix);
}
}
@ -267,14 +321,42 @@ static void help(void) {
"Find overridden configuration files.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --no-pager Do not pipe output into a pager\n",
" --no-pager Do not pipe output into a pager\n"
" --diff[=1|0] Show a diff when overriden files differ\n"
" -t --type=LIST... Only display a selected set of override types\n",
program_invocation_short_name);
}
static int parse_argv(int argc, char *argv[]) {
static int parse_flags(int flags, const char *flag_str) {
char *w, *state;
size_t l;
FOREACH_WORD(w, l, flag_str, state) {
if (strncmp("masked", w, l) == 0) {
flags |= SHOW_MASKED;
} else if (strncmp ("equivalent", w, l) == 0) {
flags |= SHOW_EQUIV;
} else if (strncmp("redirected", w, l) == 0) {
flags |= SHOW_REDIR;
} else if (strncmp("override", w, l) == 0) {
flags |= SHOW_OVERRIDEN;
} else if (strncmp("unchanged", w, l) == 0) {
flags |= SHOW_UNCHANGED;
} else if (strncmp("default", w, l) == 0) {
flags |= SHOW_DEFAULTS;
} else {
log_error("Unknown type filter: %s", w);
return -1;
}
}
return flags;
}
static int parse_argv(int argc, char *argv[], int *flags) {
enum {
ARG_NO_PAGER = 0x100,
ARG_DIFF,
ARG_VERSION
};
@ -282,6 +364,8 @@ static int parse_argv(int argc, char *argv[]) {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
{ "diff", optional_argument, NULL, ARG_DIFF },
{ "type", required_argument, NULL, 't' },
{ NULL, 0, NULL, 0 }
};
@ -311,6 +395,23 @@ static int parse_argv(int argc, char *argv[]) {
case '?':
return -EINVAL;
case 't':
*flags = parse_flags(*flags, optarg);
if (*flags < 0)
return -EINVAL;
break;
case ARG_DIFF:
if (!optarg) {
*flags |= SHOW_DIFF;
} else {
if (parse_boolean(optarg))
*flags |= SHOW_DIFF;
else
*flags &= ~SHOW_DIFF;
}
break;
default:
log_error("Unknown option code %c", c);
return -EINVAL;
@ -348,14 +449,20 @@ int main(int argc, char *argv[]) {
int r = 0, k;
int n_found = 0;
int flags = 0;
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
r = parse_argv(argc, argv, &flags);
if (r <= 0)
goto finish;
if (flags == 0)
flags = SHOW_DEFAULTS;
if (flags == SHOW_DIFF)
flags |= SHOW_OVERRIDEN;
if (!arg_no_pager)
pager_open();
@ -363,7 +470,7 @@ int main(int argc, char *argv[]) {
int i;
for (i = optind; i < argc; i++) {
k = process_suffix_chop(prefixes, argv[i]);
k = process_suffix_chop(flags, prefixes, argv[i]);
if (k < 0)
r = k;
else
@ -374,7 +481,7 @@ int main(int argc, char *argv[]) {
const char *n;
NULSTR_FOREACH(n, suffixes) {
k = process_suffix(prefixes, n);
k = process_suffix(flags, prefixes, n);
if (k < 0)
r = k;
else