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systemctl: show Environment entries with whitespace

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This makes the Environment entries more round-trippable: a similar format is
used for input and output. It is certainly more useful for users, because
showing [unprintable] on anything non-trivial makes systemctl show -p Environment
useless in many cases.

Fixes: #14723 and https://bugzilla.redhat.com/show_bug.cgi?id=1525593.

$ systemctl --user show -p Environment run-*.service
Environment=ASDF=asfd "SPACE= "
Environment=ASDF=asfd "SPACE=\n\n\n"
Environment=ASDF=asfd "TAB=\t\\" "FOO=X X"
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2020-04-06 09:57:07 +02:00
parent 2b99f645c6
commit 241c4b6ada
1 changed files with 12 additions and 9 deletions
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21
src/shared/bus-util.c
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@ -21,6 +21,7 @@
#include "bus-util.h" #include "bus-util.h"
#include "cap-list.h" #include "cap-list.h"
#include "cgroup-util.h" #include "cgroup-util.h"
#include "escape.h"
#include "mountpoint-util.h" #include "mountpoint-util.h"
#include "nsflags.h" #include "nsflags.h"
#include "parse-util.h" #include "parse-util.h"
@ -500,18 +501,20 @@ static int bus_print_property(const char *name, const char *expected_value, sd_b
return r; return r;
while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &str)) > 0) { while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &str)) > 0) {
bool good; _cleanup_free_ char *e = NULL;
if (first && !value) e = shell_maybe_quote(str, ESCAPE_BACKSLASH_ONELINE);
printf("%s=", name); if (!e)
return -ENOMEM;
/* This property has multiple space-separated values, so if (first) {
* neither spaces nor newlines can be allowed in a value. */ if (!value)
good = str[strcspn(str, " \n")] == '\0'; printf("%s=", name);
first = false;
} else
fputs(" ", stdout);
printf("%s%s", first ? "" : " ", good ? str : "[unprintable]"); fputs(e, stdout);
first = false;
} }
if (r < 0) if (r < 0)
return r; return r;