implement Signed-By option for sources.list

[apt.git] / cmdline / apt-key.in

diff --git a/cmdline/apt-key.in b/cmdline/apt-key.in
index 463e4b4b49ea588c81c5100eff8ece216912285b..16887bd50a55b99ea2cd3dd546d126c82d616bd2 100644 (file)
--- a/cmdline/apt-key.in
+++ b/cmdline/apt-key.in
@@ -3,28 +3,6 @@
 set -e
 unset GREP_OPTIONS
 
 set -e
 unset GREP_OPTIONS
 

-GPG_CMD="gpg --ignore-time-conflict --no-options --no-default-keyring"
-
-# gpg needs a trustdb to function, but it can't be invalid (not even empty)
-# so we create a temporary directory to store our fresh readable trustdb in
-TRUSTDBDIR="$(mktemp -d)"
-CURRENTTRAP="${CURRENTTRAP} rm -rf '${TRUSTDBDIR}';"
-trap "${CURRENTTRAP}" 0 HUP INT QUIT ILL ABRT FPE SEGV PIPE TERM
-chmod 700 "$TRUSTDBDIR"
-# We also don't use a secret keyring, of course, but gpg panics and
-# implodes if there isn't one available - and writeable for imports
-SECRETKEYRING="${TRUSTDBDIR}/secring.gpg"
-touch $SECRETKEYRING
-GPG_CMD="$GPG_CMD --secret-keyring $SECRETKEYRING"
-GPG_CMD="$GPG_CMD --trustdb-name ${TRUSTDBDIR}/trustdb.gpg"
-
-# now create the trustdb with an (empty) dummy keyring
-$GPG_CMD --quiet --check-trustdb --keyring $SECRETKEYRING
-# and make sure that gpg isn't trying to update the file
-GPG_CMD="$GPG_CMD --no-auto-check-trustdb --trust-model always"
-
-GPG="$GPG_CMD"
-

 APT_DIR="/"
 eval $(apt-config shell APT_DIR Dir)
 
 APT_DIR="/"
 eval $(apt-config shell APT_DIR Dir)
 


@@ -36,22 +14,26 @@ REMOVED_KEYS='&keyring-removed-filename;'
 eval $(apt-config shell REMOVED_KEYS APT::Key::RemovedKeys)
 ARCHIVE_KEYRING_URI='&keyring-uri;'
 eval $(apt-config shell ARCHIVE_KEYRING_URI APT::Key::ArchiveKeyringURI)
 eval $(apt-config shell REMOVED_KEYS APT::Key::RemovedKeys)
 ARCHIVE_KEYRING_URI='&keyring-uri;'
 eval $(apt-config shell ARCHIVE_KEYRING_URI APT::Key::ArchiveKeyringURI)

-TMP_KEYRING=${APT_DIR}/var/lib/apt/keyrings/maybe-import-keyring.gpg
+
+aptkey_echo() { echo "$@"; }

 
 requires_root() {
        if [ "$(id -u)" -ne 0 ]; then
 
 requires_root() {
        if [ "$(id -u)" -ne 0 ]; then

-               echo >&1 "ERROR: This command can only be used by root."
+               echo >&2 "ERROR: This command can only be used by root."

                exit 1
        fi
 }
 
                exit 1
        fi
 }
 

-# gpg defaults to mode 0600 for new keyrings. Create one with 0644 instead.
-init_keyring() {
-    for path; do
-        if ! [ -e "$path" ]; then
-            touch -- "$path"
-            chmod 0644 -- "$path"
-        fi
+get_fingerprints_of_keyring() {
+    $GPG_CMD --keyring "$1" --with-colons --fingerprint | while read publine; do
+       # search for a public key
+       if [ "${publine%%:*}" != 'pub' ]; then continue; fi
+       # search for the associated fingerprint (should be the very next line)
+       while read fprline; do
+          if [ "${fprline%%:*}" = 'sub' ]; then break; # should never happen
+          elif [ "${fprline%%:*}" != 'fpr' ]; then continue; fi
+          echo "$fprline" | cut -d':' -f 10
+       done

     done
 }
 
     done
 }
 


@@ -60,11 +42,11 @@ add_keys_with_verify_against_master_keyring() {
     MASTER=$2
 
     if [ ! -f "$ADD_KEYRING" ]; then
     MASTER=$2
 
     if [ ! -f "$ADD_KEYRING" ]; then

-       echo "ERROR: '$ADD_KEYRING' not found"
+       echo >&2 "ERROR: '$ADD_KEYRING' not found"

        return
        return

-    fi 
+    fi

     if [ ! -f "$MASTER" ]; then
     if [ ! -f "$MASTER" ]; then

-       echo "ERROR: '$MASTER' not found"
+       echo >&2 "ERROR: '$MASTER' not found"

        return
     fi
 
        return
     fi
 


@@ -72,7 +54,7 @@ add_keys_with_verify_against_master_keyring() {
     # is honored. so:
     #   all keys that are exported must have a valid signature
     #   from a key in the $distro-master-keyring
     # is honored. so:
     #   all keys that are exported must have a valid signature
     #   from a key in the $distro-master-keyring

-    add_keys=`$GPG_CMD --keyring $ADD_KEYRING --with-colons --list-keys | grep ^pub | cut -d: -f5`
+    add_keys="$(get_fingerprints_of_keyring "$ADD_KEYRING")"

     all_add_keys=`$GPG_CMD --keyring $ADD_KEYRING --with-colons --list-keys | grep ^[ps]ub | cut -d: -f5`
     master_keys=`$GPG_CMD --keyring $MASTER --with-colons --list-keys | grep ^pub | cut -d: -f5`
 
     all_add_keys=`$GPG_CMD --keyring $ADD_KEYRING --with-colons --list-keys | grep ^[ps]ub | cut -d: -f5`
     master_keys=`$GPG_CMD --keyring $MASTER --with-colons --list-keys | grep ^pub | cut -d: -f5`
 


@@ -85,24 +67,28 @@ add_keys_with_verify_against_master_keyring() {
             fi
         done
     done
             fi
         done
     done

-    
+

     for add_key in $add_keys; do
         # export the add keyring one-by-one
     for add_key in $add_keys; do
         # export the add keyring one-by-one

-        rm -f $TMP_KEYRING
-        $GPG_CMD --keyring $ADD_KEYRING --output $TMP_KEYRING --export $add_key 
-        # check if signed with the master key and only add in this case
-        ADDED=0
+       local TMP_KEYRING="${GPGHOMEDIR}/tmp-keyring.gpg"
+       $GPG_CMD --batch --yes --keyring "$ADD_KEYRING" --output "$TMP_KEYRING" --export "$add_key"
+       if ! $GPG_CMD --batch --yes --keyring "$TMP_KEYRING" --import "$MASTER" > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then
+           cat "${GPGHOMEDIR}/gpgoutput.log"
+           false
+       fi
+       # check if signed with the master key and only add in this case
+       ADDED=0

        for master_key in $master_keys; do
        for master_key in $master_keys; do

-           if $GPG_CMD --keyring $MASTER --keyring $TMP_KEYRING --check-sigs --with-colons $add_key | grep '^sig:!:' | cut -d: -f5 | grep -q $master_key; then
-               $GPG --import $TMP_KEYRING
+           if $GPG_CMD --keyring $TMP_KEYRING --check-sigs --with-colons $add_key | grep '^sig:!:' | cut -d: -f5 | grep -q $master_key; then
+               $GPG_CMD --batch --yes --keyring "$ADD_KEYRING" --export "$add_key" | $GPG --batch --yes --import

                ADDED=1
            fi
        done
        if [ $ADDED = 0 ]; then
            echo >&2 "Key '$add_key' not added. It is not signed with a master key"
        fi
                ADDED=1
            fi
        done
        if [ $ADDED = 0 ]; then
            echo >&2 "Key '$add_key' not added. It is not signed with a master key"
        fi

+       rm -f "${TMP_KEYRING}"

     done
     done

-    rm -f $TMP_KEYRING

 }
 
 # update the current archive signing keyring from a network URI
 }
 
 # update the current archive signing keyring from a network URI


@@ -120,7 +106,6 @@ net_update() {
        echo >&2 "ERROR: Your distribution is not supported in net-update as no uri for the archive-keyring is set"
        exit 1
     fi
        echo >&2 "ERROR: Your distribution is not supported in net-update as no uri for the archive-keyring is set"
        exit 1
     fi

-    requires_root

     # in theory we would need to depend on wget for this, but this feature
     # isn't useable in debian anyway as we have no keyring uri nor a master key
     if ! which wget >/dev/null 2>&1; then
     # in theory we would need to depend on wget for this, but this feature
     # isn't useable in debian anyway as we have no keyring uri nor a master key
     if ! which wget >/dev/null 2>&1; then


@@ -141,7 +126,7 @@ net_update() {
     fi
     new_mtime=$(stat -c %Y $keyring)
     if [ $new_mtime -ne $old_mtime ]; then
     fi
     new_mtime=$(stat -c %Y $keyring)
     if [ $new_mtime -ne $old_mtime ]; then

-       echo "Checking for new archive signing keys now"
+       aptkey_echo "Checking for new archive signing keys now"

        add_keys_with_verify_against_master_keyring $keyring $MASTER_KEYRING
     fi
 }
        add_keys_with_verify_against_master_keyring $keyring $MASTER_KEYRING
     fi
 }


@@ -152,7 +137,6 @@ update() {
        echo >&2 "Is the &keyring-package; package installed?"
        exit 1
     fi
        echo >&2 "Is the &keyring-package; package installed?"
        exit 1
     fi

-    requires_root

 
     # add new keys from the package;
 
 
     # add new keys from the package;
 


@@ -165,71 +149,166 @@ update() {
 
     if [ -r "$REMOVED_KEYS" ]; then
        # remove no-longer supported/used keys
 
     if [ -r "$REMOVED_KEYS" ]; then
        # remove no-longer supported/used keys

-       keys=`$GPG_CMD --keyring $REMOVED_KEYS --with-colons --list-keys | grep ^pub | cut -d: -f5`
-       for key in $keys; do
-           if $GPG --list-keys --with-colons | grep ^pub | cut -d: -f5 | grep -q $key; then
-               $GPG --quiet --batch --delete-key --yes ${key}
-           fi
+       get_fingerprints_of_keyring "$REMOVED_KEYS" | while read key; do
+           foreach_keyring_do 'remove_key_from_keyring' "$key"

        done
     else
        done
     else

-       echo "Warning: removed keys keyring  $REMOVED_KEYS missing or not readable" >&2
+       echo >&2 "Warning: removed keys keyring  $REMOVED_KEYS missing or not readable"

     fi
 }
 
 remove_key_from_keyring() {
     fi
 }
 
 remove_key_from_keyring() {

-    local GPG="$GPG_CMD --keyring $1"
-    # check if the key is in this keyring: the key id is in the 5 column at the end
-    if ! $GPG --with-colons --list-keys 2>&1 | grep -q "^pub:[^:]*:[^:]*:[^:]*:[0-9A-F]\+$2:"; then
-       return
-    fi
-    if [ ! -w "$1" ]; then
-       echo >&2 "Key ${2} is in keyring ${1}, but can't be removed as it is read only."
-       return
+    local KEYRINGFILE="$1"
+    shift
+    # non-existent keyrings have by definition no keys
+    if [ ! -e "$KEYRINGFILE" ]; then
+       return

     fi
     fi

-    # check if it is the only key in the keyring and if so remove the keyring alltogether
-    if [ '1' = "$($GPG --with-colons --list-keys | grep "^pub:[^:]*:[^:]*:[^:]*:[0-9A-F]\+:" | wc -l)" ]; then
-       mv -f "$1" "${1}~" # behave like gpg
-       return
-    fi
-    # we can't just modify pointed to files as these might be in /usr or something
-    local REALTARGET
-    if [ -L "$1" ]; then
-       REALTARGET="$(readlink -f "$1")"
-       mv -f "$1" "${1}.dpkg-tmp"
-       cp -a "$REALTARGET" "$1"
-       ls "$(dirname $1)"
-    fi
-    # delete the key from the keyring
-    $GPG --batch --delete-key --yes "$2"
-    if [ -n "$REALTARGET" ]; then
-       # the real backup is the old link, not the copy we made
-       mv -f "${1}.dpkg-tmp" "${1}~"
-    fi
-}

 
 

-remove_key() {
-    requires_root
+    local GPG="$GPG_CMD --keyring $KEYRINGFILE"
+    for KEY in "$@"; do
+       # check if the key is in this keyring: the key id is in the 5 column at the end
+       if ! get_fingerprints_of_keyring "$KEYRINGFILE" | grep -iq "^[0-9A-F]*${KEY}$"; then
+           continue
+       fi
+       if [ ! -w "$KEYRINGFILE" ]; then
+           echo >&2 "Key ${KEY} is in keyring ${KEYRINGFILE}, but can't be removed as it is read only."
+           continue
+       fi
+       # check if it is the only key in the keyring and if so remove the keyring altogether
+       if [ '1' = "$(get_fingerprints_of_keyring "$KEYRINGFILE" | wc -l)" ]; then
+           mv -f "$KEYRINGFILE" "${KEYRINGFILE}~" # behave like gpg
+           return
+       fi
+       # we can't just modify pointed to files as these might be in /usr or something
+       local REALTARGET
+       if [ -L "$KEYRINGFILE" ]; then
+           REALTARGET="$(readlink -f "$KEYRINGFILE")"
+           mv -f "$KEYRINGFILE" "${KEYRINGFILE}.dpkg-tmp"
+           cp -a "$REALTARGET" "$KEYRINGFILE"
+       fi
+       # delete the key from the keyring
+       $GPG --batch --delete-key --yes "$KEY"
+       if [ -n "$REALTARGET" ]; then
+           # the real backup is the old link, not the copy we made
+           mv -f "${KEYRINGFILE}.dpkg-tmp" "${KEYRINGFILE}~"
+       fi
+    done
+}

 
 

-    # if a --keyring was given, just remove from there
-    if [ -n "$FORCED_KEYRING" ]; then
-       remove_key_from_keyring "$FORCED_KEYRING" "$1"
-    else
+foreach_keyring_do() {
+   local ACTION="$1"
+   shift
+   # if a --keyring was given, just work on this one
+   if [ -n "$FORCED_KEYRING" ]; then
+       $ACTION "$FORCED_KEYRING" "$@"
+   else

        # otherwise all known keyrings are up for inspection
        # otherwise all known keyrings are up for inspection

-       local TRUSTEDFILE="/etc/apt/trusted.gpg"
-       eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring)
-       eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f)
-       remove_key_from_keyring "$TRUSTEDFILE" "$1"
-       TRUSTEDPARTS="/etc/apt/trusted.gpg.d"
+       if [ -s "$TRUSTEDFILE" ]; then
+           $ACTION "$TRUSTEDFILE" "$@"
+       fi
+       local TRUSTEDPARTS="/etc/apt/trusted.gpg.d"

        eval $(apt-config shell TRUSTEDPARTS Dir::Etc::TrustedParts/d)
        if [ -d "$TRUSTEDPARTS" ]; then
        eval $(apt-config shell TRUSTEDPARTS Dir::Etc::TrustedParts/d)
        if [ -d "$TRUSTEDPARTS" ]; then

+           # strip / suffix as gpg will double-slash in that case (#665411)
+           local STRIPPED_TRUSTEDPARTS="${TRUSTEDPARTS%/}"
+           if [ "${STRIPPED_TRUSTEDPARTS}/" = "$TRUSTEDPARTS" ]; then
+               TRUSTEDPARTS="$STRIPPED_TRUSTEDPARTS"
+           fi

            for trusted in $(run-parts --list "$TRUSTEDPARTS" --regex '^.*\.gpg$'); do
            for trusted in $(run-parts --list "$TRUSTEDPARTS" --regex '^.*\.gpg$'); do

-               remove_key_from_keyring "$trusted" "$1"
+               if [ -s "$trusted" ]; then
+                   $ACTION "$trusted" "$@"
+               fi

            done
        fi
            done
        fi

+   fi
+}
+
+run_cmd_on_keyring() {
+    local KEYRINGFILE="$1"
+    shift
+    # fingerprint and co will fail if key isn't in this keyring
+    $GPG_CMD --keyring "$KEYRINGFILE" --batch "$@" 2>/dev/null || true
+}
+
+import_keys_from_keyring() {
+    local IMPORT="$1"
+    local KEYRINGFILE="$2"
+    if ! $GPG_CMD --keyring "$KEYRINGFILE" --batch --import "$IMPORT" > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then
+       cat "${GPGHOMEDIR}/gpgoutput.log"
+       false

     fi
     fi

-    echo "OK"

 }
 
 }
 

+merge_keys_into_keyrings() {
+    local KEYRINGFILE="$1"
+    local IMPORT="$2"
+    if ! $GPG_CMD --keyring "$KEYRINGFILE" --batch --import --import-options 'merge-only' "$IMPORT" > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then
+       cat "${GPGHOMEDIR}/gpgoutput.log"
+       false
+    fi
+}
+
+merge_back_changes() {
+    if [ -n "$FORCED_KEYRING" ]; then
+       # if the keyring was forced merge is already done
+       return
+    fi
+    if [ -s "${GPGHOMEDIR}/pubring.gpg" ]; then
+       # merge all updated keys
+       foreach_keyring_do 'merge_keys_into_keyrings' "${GPGHOMEDIR}/pubring.gpg"
+    fi
+    # look for keys which were added or removed
+    get_fingerprints_of_keyring "${GPGHOMEDIR}/pubring.orig.gpg" > "${GPGHOMEDIR}/pubring.orig.keylst"
+    get_fingerprints_of_keyring "${GPGHOMEDIR}/pubring.gpg" > "${GPGHOMEDIR}/pubring.keylst"
+    sort "${GPGHOMEDIR}/pubring.keylst" "${GPGHOMEDIR}/pubring.orig.keylst" | uniq --unique | while read key; do
+       if grep -q "^${key}$" "${GPGHOMEDIR}/pubring.orig.keylst"; then
+           # key isn't part of new keyring, so remove
+           foreach_keyring_do 'remove_key_from_keyring' "$key"
+       elif grep -q "^${key}$" "${GPGHOMEDIR}/pubring.keylst"; then
+           # key is part of new keyring, so we need to import it
+           create_new_keyring "$TRUSTEDFILE"
+           if ! $GPG --batch --yes --export "$key" | $GPG_CMD --keyring "$TRUSTEDFILE" --batch --yes --import > "${GPGHOMEDIR}/gpgoutput.log" 2>&1; then
+              cat "${GPGHOMEDIR}/gpgoutput.log"
+              false
+           fi
+       else
+           echo >&2 "Errror: Key ${key} (dis)appeared out of nowhere"
+       fi
+    done
+}
+
+setup_merged_keyring() {
+    if [ -n "$FORCED_KEYID" ]; then
+       foreach_keyring_do 'import_keys_from_keyring' "${GPGHOMEDIR}/allrings.gpg"
+       FORCED_KEYRING="${GPGHOMEDIR}/forcedkeyid.gpg"
+       TRUSTEDFILE="${FORCED_KEYRING}"
+       GPG="$GPG --keyring $TRUSTEDFILE"
+       # ignore error as this "just" means we haven't found the forced keyid and the keyring will be empty
+       $GPG_CMD --batch --yes --keyring "${GPGHOMEDIR}/allrings.gpg" --export "$FORCED_KEYID" | $GPG --batch --yes --import || true
+    elif [ -z "$FORCED_KEYRING" ]; then
+       foreach_keyring_do 'import_keys_from_keyring' "${GPGHOMEDIR}/pubring.gpg"
+       if [ -r "${GPGHOMEDIR}/pubring.gpg" ]; then
+           cp -a "${GPGHOMEDIR}/pubring.gpg" "${GPGHOMEDIR}/pubring.orig.gpg"
+       else
+          touch "${GPGHOMEDIR}/pubring.gpg" "${GPGHOMEDIR}/pubring.orig.gpg"
+       fi
+       GPG="$GPG --keyring ${GPGHOMEDIR}/pubring.gpg"
+    else
+       GPG="$GPG --keyring $TRUSTEDFILE"
+       create_new_keyring "$TRUSTEDFILE"
+    fi
+}
+
+create_new_keyring() {
+    # gpg defaults to mode 0600 for new keyrings. Create one with 0644 instead.
+    if ! [ -e "$TRUSTEDFILE" ]; then
+       if [ -w "$(dirname "$TRUSTEDFILE")" ]; then
+           touch -- "$TRUSTEDFILE"
+           chmod 0644 -- "$TRUSTEDFILE"
+       fi
+    fi
+}

 
 usage() {
     echo "Usage: apt-key [--keyring file] [command] [arguments]"
 
 usage() {
     echo "Usage: apt-key [--keyring file] [command] [arguments]"


@@ -255,17 +334,24 @@ while [ -n "$1" ]; do
         shift
         TRUSTEDFILE="$1"
         FORCED_KEYRING="$1"
         shift
         TRUSTEDFILE="$1"
         FORCED_KEYRING="$1"

-        if [ -r "$TRUSTEDFILE" ] || [ "$2" = 'add' ] || [ "$2" = 'adv' ]; then
-           GPG="$GPG --keyring $TRUSTEDFILE --primary-keyring $TRUSTEDFILE"
-        else
-           echo >&2 "Error: The specified keyring »$TRUSTEDFILE« is missing or not readable"
-           exit 1
-        fi
+        ;;
+      --keyid)

         shift
         shift

+        FORCED_KEYID="$1"
+        ;;
+      --secret-keyring)
+        shift
+        FORCED_SECRET_KEYRING="$1"
+        ;;
+      --readonly)
+        merge_back_changes() { true; }
+        create_new_keyring() { true; }

         ;;
       --fakeroot)
         requires_root() { true; }
         ;;
       --fakeroot)
         requires_root() { true; }

-        shift
+        ;;
+      --quiet)
+        aptkey_echo() { true; }

         ;;
       --*)
         echo >&2 "Unknown option: $1"
         ;;
       --*)
         echo >&2 "Unknown option: $1"


@@ -274,28 +360,13 @@ while [ -n "$1" ]; do
       *)
         break;;
    esac
       *)
         break;;
    esac

+   shift

 done
 
 if [ -z "$TRUSTEDFILE" ]; then
    TRUSTEDFILE="/etc/apt/trusted.gpg"
    eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring)
    eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f)
 done
 
 if [ -z "$TRUSTEDFILE" ]; then
    TRUSTEDFILE="/etc/apt/trusted.gpg"
    eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring)
    eval $(apt-config shell TRUSTEDFILE Dir::Etc::Trusted/f)

-   if [ -r "$TRUSTEDFILE" ]; then
-      GPG="$GPG --keyring $TRUSTEDFILE"
-   fi
-   GPG="$GPG --primary-keyring $TRUSTEDFILE"
-   TRUSTEDPARTS="/etc/apt/trusted.gpg.d"
-   eval $(apt-config shell TRUSTEDPARTS Dir::Etc::TrustedParts/d)
-   if [ -d "$TRUSTEDPARTS" ]; then
-      # strip / suffix as gpg will double-slash in that case (#665411)
-      STRIPPED_TRUSTEDPARTS="${TRUSTEDPARTS%/}"
-      if [ "${STRIPPED_TRUSTEDPARTS}/" = "$TRUSTEDPARTS" ]; then
-        TRUSTEDPARTS="$STRIPPED_TRUSTEDPARTS"
-      fi
-      for trusted in $(run-parts --list "$TRUSTEDPARTS" --regex '^.*\.gpg$'); do
-        GPG="$GPG --keyring $trusted"
-      done
-   fi

 fi
 
 command="$1"
 fi
 
 command="$1"


@@ -305,52 +376,111 @@ if [ -z "$command" ]; then
 fi
 shift
 
 fi
 shift
 

-if [ "$command" != "help" ] && ! which gpg >/dev/null 2>&1; then
-    echo >&2 "Warning: gnupg does not seem to be installed."
-    echo >&2 "Warning: apt-key requires gnupg for most operations."
-    echo >&2
+if [ "$command" != "help" ]; then
+    eval $(apt-config shell GPG_EXE Apt::Key::gpgcommand)
+
+    if [ -n "$GPG_EXE" ] && which "$GPG_EXE" >/dev/null 2>&1; then
+       true
+    elif which gpg >/dev/null 2>&1; then
+       GPG_EXE="gpg"
+    elif which gpg2 >/dev/null 2>&1; then
+       GPG_EXE="gpg2"
+    else
+       echo >&2 "Error: gnupg or gnupg2 do not seem to be installed,"
+       echo >&2 "Error: but apt-key requires gnupg or gnupg2 for operation."
+       echo >&2
+       exit 255
+    fi
+
+    GPG_CMD="$GPG_EXE --ignore-time-conflict --no-options --no-default-keyring"
+
+    # gpg needs (in different versions more or less) files to function correctly,
+    # so we give it its own homedir and generate some valid content for it
+    if [ -n "$TMPDIR" ]; then
+       # tmpdir is a directory and current user has rwx access to it
+       # same tests as in apt-pkg/contrib/fileutl.cc GetTempDir()
+       if [ ! -d "$TMPDIR" ] || [ ! -r "$TMPDIR" ] || [ ! -w "$TMPDIR" ] || [ ! -x "$TMPDIR" ]; then
+         unset TMPDIR
+       fi
+    fi
+    GPGHOMEDIR="$(mktemp -d)"
+    CURRENTTRAP="${CURRENTTRAP} rm -rf '${GPGHOMEDIR}';"
+    trap "${CURRENTTRAP}" 0 HUP INT QUIT ILL ABRT FPE SEGV PIPE TERM
+    chmod 700 "$GPGHOMEDIR"
+    # We don't use a secret keyring, of course, but gpg panics and
+    # implodes if there isn't one available - and writeable for imports
+    SECRETKEYRING="${GPGHOMEDIR}/secring.gpg"
+    touch $SECRETKEYRING
+    GPG_CMD="$GPG_CMD --homedir $GPGHOMEDIR"
+    # create the trustdb with an (empty) dummy keyring
+    # older gpgs required it, newer gpgs even warn that it isn't needed,
+    # but require it nonetheless for some commands, so we just play safe
+    # here for the foreseeable future and create a dummy one
+    $GPG_CMD --quiet --check-trustdb --keyring $SECRETKEYRING >/dev/null 2>&1
+    # tell gpg that it shouldn't try to maintain a trustdb file
+    GPG_CMD="$GPG_CMD --no-auto-check-trustdb --trust-model always"
+    GPG="$GPG_CMD"
+
+    # for advanced operations, we might really need a secret keyring after all
+    if [ -n "$FORCED_SECRET_KEYRING" ] && [ -r "$FORCED_SECRET_KEYRING" ]; then
+       rm -f "$SECRETKEYRING"
+       cp -a "$FORCED_SECRET_KEYRING" "$SECRETKEYRING"
+    fi

 fi
 
 case "$command" in
     add)
 fi
 
 case "$command" in
     add)

-        requires_root
-        init_keyring "$TRUSTEDFILE"
-        $GPG --quiet --batch --import "$1"
-        echo "OK"
+       requires_root
+       setup_merged_keyring
+       $GPG --quiet --batch --import "$@"
+       merge_back_changes
+       aptkey_echo "OK"

         ;;
     del|rm|remove)
         ;;
     del|rm|remove)

-        init_keyring "$TRUSTEDFILE"
-       remove_key "$1"
+       requires_root
+       foreach_keyring_do 'remove_key_from_keyring' "$@"
+       aptkey_echo "OK"

         ;;
     update)
         ;;
     update)

-        init_keyring "$TRUSTEDFILE"
+       requires_root
+       setup_merged_keyring

        update
        update

+       merge_back_changes

        ;;
     net-update)
        ;;
     net-update)

-        init_keyring "$TRUSTEDFILE"
+       requires_root
+       setup_merged_keyring

        net_update
        net_update

+       merge_back_changes

        ;;
     list)
        ;;
     list)

-        init_keyring "$TRUSTEDFILE"
-        $GPG --batch --list-keys
-        ;;
+       foreach_keyring_do 'run_cmd_on_keyring' --list-keys "$@"
+       ;;

     finger*)
     finger*)

-        init_keyring "$TRUSTEDFILE"
-        $GPG --batch --fingerprint
-        ;;
-    export)
-        init_keyring "$TRUSTEDFILE"
-        $GPG --armor --export "$1"
-        ;;
-    exportall)
-        init_keyring "$TRUSTEDFILE"
-        $GPG --armor --export
-        ;;
+       foreach_keyring_do 'run_cmd_on_keyring' --fingerprint "$@"
+       ;;
+    export|exportall)
+       foreach_keyring_do 'import_keys_from_keyring' "${GPGHOMEDIR}/pubring.gpg"
+       $GPG_CMD --keyring "${GPGHOMEDIR}/pubring.gpg" --armor --export "$@"
+       ;;

     adv*)
     adv*)

-        init_keyring "$TRUSTEDFILE"
-        echo "Executing: $GPG $*"
-        $GPG $*
-        ;;
+       setup_merged_keyring
+       aptkey_echo "Executing: $GPG $*"
+       $GPG "$@"
+       merge_back_changes
+       ;;
+    verify)
+       setup_merged_keyring
+       if which gpgv >/dev/null 2>&1; then
+           if [ -n "$FORCED_KEYRING" ]; then
+               gpgv --homedir "${GPGHOMEDIR}" --keyring "${FORCED_KEYRING}" --ignore-time-conflict "$@"
+           else
+               gpgv --homedir "${GPGHOMEDIR}" --keyring "${GPGHOMEDIR}/pubring.gpg" --ignore-time-conflict "$@"
+           fi
+       else
+           $GPG --verify "$@"
+       fi
+       ;;

     help)
         usage
         ;;
     help)
         usage
         ;;