Add rpmkeys --export

Just writes the keys out to stdout in an ASCII armored format.

Resolves: rpm-software-management#3366

docs/man/rpmkeys.8.md

@@ -21,6 +21,8 @@ The general forms of rpm digital signature commands are
 
 **rpmkeys** **\--list** \[*KEYFINGERPRINT \...*\]
 
+**rpmkeys** **\--export** \[*KEYFINGERPRINT \...*\]
+
 **rpmkeys** **\--import** *PUBKEY \...*
 
 **rpmkeys** **\--delete** *KEYHASH \...*
@@ -53,6 +55,10 @@ querying. Here\'s information about the Red Hat GPG/DSA key:
 Finally, public keys can be erased after importing just like packages.
 Here\'s how to remove the Red Hat GPG/DSA key:
 
+**rpmkeys** **\--export**
+
+Write the keys in an armor wrapped text format to standard out.
+
 **rpmkeys** **\--delete db42a60e**
 
 Or alternatively:

tests/rpmdb.at

@@ -168,6 +168,117 @@ b6542f92f30650c36b6f41bcb3a771bfeb04e625 Alice <[email protected]> public key
 ],
 [])
 
+RPMTEST_CHECK([
+runroot rpmkeys --export
+],
+[0],
+[-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=Z6nu
+-----END PGP PUBLIC KEY BLOCK-----
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+FwY=
+=sZKd
+-----END PGP PUBLIC KEY BLOCK-----
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=Qf3c
+-----END PGP PUBLIC KEY BLOCK-----
+],
+[])
+
 RPMTEST_CHECK([
 runroot rpmkeys --list 771b18d3d7baa28734333c424344591e1964c5fc
 ],
@@ -184,6 +295,42 @@ runroot rpmkeys --list 4344591e1964c5fc
 ],
 [])
 
+RPMTEST_CHECK([
+runroot rpmkeys --export 4344591e1964c5fc
+],
+[0],
+[-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+UNW2iqnN3BA7guhOv6OMiROF1+I7Q5nWT63mQC7IgQ==
+=Z6nu
+-----END PGP PUBLIC KEY BLOCK-----
+],
+[])
+
 
 RPMTEST_CHECK([
 runroot rpmkeys --list XXX

tools/rpmkeys.cc

@@ -14,6 +14,7 @@ enum modes {
     MODE_IMPORTKEY	= (1 << 1),
     MODE_DELKEY		= (1 << 2),
     MODE_LISTKEY	= (1 << 3),
+    MODE_EXPORTKEY	= (1 << 4),
 };
 
 static int mode = 0;
@@ -24,6 +25,8 @@ static struct poptOption keyOptsTable[] = {
 	N_("verify package signature(s)"), NULL },
     { "import", '\0', (POPT_ARG_VAL|POPT_ARGFLAG_OR), &mode, MODE_IMPORTKEY,
 	N_("import an armored public key"), NULL },
+    { "export", '\0', (POPT_ARG_VAL|POPT_ARGFLAG_OR), &mode, MODE_EXPORTKEY,
+	N_("export an public key"), NULL },
     { "test", '\0', POPT_ARG_NONE, &test, 0,
 	N_("don't import, but tell if it would work or not"), NULL },
     { "delete", '\0', (POPT_ARG_VAL|POPT_ARGFLAG_OR), &mode, MODE_DELKEY,
@@ -123,6 +126,14 @@ static int deleteKey(rpmPubkey key, void * data)
     return 0;
 }
 
+static int exportKey(rpmPubkey key, void * data)
+{
+    char * armored = rpmPubkeyArmorWrap(key);
+    rpmlog(RPMLOG_NOTICE, "%s", armored);
+    free(armored);
+    return 0;
+}
+
 int main(int argc, char *argv[])
 {
     int ec = EXIT_FAILURE;
@@ -139,7 +150,7 @@ int main(int argc, char *argv[])
 
     args = (ARGV_const_t) poptGetArgs(optCon);
 
-    if (mode != MODE_LISTKEY && args == NULL)
+    if (args == NULL && mode != MODE_LISTKEY && mode != MODE_EXPORTKEY)
 	argerror(_("no arguments given"));
 
     ts = rpmtsCreate();
@@ -154,6 +165,11 @@ int main(int argc, char *argv[])
 	    rpmtsSetFlags(ts, (rpmtsFlags(ts)|RPMTRANS_FLAG_TEST));
 	ec = rpmcliImportPubkeys(ts, args);
 	break;
+    case MODE_EXPORTKEY:
+    {
+	ec = matchingKeys(ts, args, exportKey);
+	break;
+    }
     case MODE_DELKEY:
     {
 	rpmtxn txn = rpmtxnBegin(ts, RPMTXN_WRITE);