mkarchiso: add some sane gpg options to override those set in user's gpg.conf

* Add --batch, since gpg is run in a script.
* Add --no-armor (this is the default). Armored output provides no benifit here.
* Add --no-include-key-block (this is the default). There is no need to have the gpg key in the signature. The mkinitcpio hook will verify the signature against the included keyring.

Remove the output files before running gpg. Otherwise gpg --batch will fail if they exist.

1 files changed, 9 insertions, 6 deletions

diff --git a/archiso/mkarchiso b/archiso/mkarchiso
index 267804a..0a46fd6 100755
--- a/archiso/mkarchiso
+++ b/archiso/mkarchiso
@@ -238,15 +238,17 @@ _mkchecksum() {
 
 # GPG sign the root file system image.
 _mksignature() {
+    local airootfs_image_filename
     _msg_info "Signing rootfs image..."
-    cd -- "${isofs_dir}/${install_dir}/${arch}"
-    # always use the .sig file extension, as that is what mkinitcpio-archiso's hooks expect
     if [[ -e "${isofs_dir}/${install_dir}/${arch}/airootfs.sfs" ]]; then
-        gpg --output airootfs.sfs.sig --detach-sign --default-key "${gpg_key}" airootfs.sfs
+        airootfs_image_filename="${isofs_dir}/${install_dir}/${arch}/airootfs.sfs"
     elif [[ -e "${isofs_dir}/${install_dir}/${arch}/airootfs.erofs" ]]; then
-        gpg --output airootfs.erofs.sig --detach-sign --default-key "${gpg_key}" airootfs.erofs
+        airootfs_image_filename="${isofs_dir}/${install_dir}/${arch}/airootfs.erofs"
     fi
-    cd -- "${OLDPWD}"
+    rm -f -- "${airootfs_image_filename}.sig"
+    # always use the .sig file extension, as that is what mkinitcpio-archiso's hooks expect
+    gpg --batch --no-armor --no-include-key-block --output "${airootfs_image_filename}.sig" --detach-sign \
+        --default-key "${gpg_key}" "${airootfs_image_filename}"
     _msg_info "Done!"
 }
 
@@ -1126,7 +1128,8 @@ _set_overrides() {
 }
 
 _export_gpg_publickey() {
-    gpg --batch --output "${work_dir}/pubkey.gpg" --export "${gpg_key}"
+    rm -f -- "${work_dir}/pubkey.gpg"
+    gpg --batch --no-armor --output "${work_dir}/pubkey.gpg" --export "${gpg_key}"
 }
 
 _make_version() {