Re: [PATCH v2 1/1] isar-check-rootless: check parent dirs are world searchable

[Zhihang Wei <wzh@ilbers.de>]

Applied to next, thanks.

Zhihang

On 9/11/26 10:03, 'Felix Moessbauer' via isar-users wrote:
> When using mmdebstrap with the unshare backend, all parent directories
> of the TMPDIR must be world searchable (S_IXOTH). This requirement is
> documented in the mmdebstrap man page, but when not fulfilled, mmdebstrap
> fails in colorful ways.
>
> To indicate what is wrong, we add a check to the isar-check-rootless
> script.
>
> Reported-by: Clara Kowalsky <clara.kowalsky@siemens.com>
> Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
> ---
> Changes since v1:
>
> - reworded "executable" to "searchable" as pointed out by Ulrich
>
>   scripts/isar-check-rootless | 33 +++++++++++++++++++++++++++++++++
>   1 file changed, 33 insertions(+)
>
> diff --git a/scripts/isar-check-rootless b/scripts/isar-check-rootless
> index b5197111..04717410 100755
> --- a/scripts/isar-check-rootless
> +++ b/scripts/isar-check-rootless
> @@ -20,6 +20,35 @@ fi
>   
>   [ "$verbose" = 0 ] || echo "RUN_PRIVILEGED_CMD: $run_privileged_cmd" >&2
>   
> +if ! tmpdir=$( \
> +	BB_ENV_PASSTHROUGH_ADDITIONS="${BB_ENV_PASSTHROUGH_ADDITIONS} ISAR_ROOTLESS" \
> +	ISAR_ROOTLESS=1 bitbake-getvar -q --value TMPDIR); then
> +	echo "error: cannot determine TMPDIR from BitBake" >&2
> +	exit 1
> +fi
> +
> +[ "$verbose" = 0 ] || echo "TMPDIR: $tmpdir" >&2
> +
> +failed=0
> +fail() {
> +	echo "error: $1" >&2
> +	echo "       likely cause: $2" >&2
> +	failed=1
> +}
> +
> +# mmdebstrap in unshare mode populates a temporary directory below TMPDIR as a
> +# subordinate user. That user can only reach it if every ancestor of TMPDIR is
> +# world-searchable (see mmdebstrap(1), TMPDIR).
> +dir=$tmpdir
> +while [ "$dir" != "/" ]; do
> +	if [ -e "$dir" ] && \
> +	   [ -z "$(find "$dir" -maxdepth 0 -perm -0001 2>/dev/null)" ]; then
> +		fail "'$dir' is not world-searchable" \
> +			"a restrictive parent directory (e.g. with 0700) prevents the unshared user from reaching TMPDIR"
> +	fi
> +	dir=$(dirname "$dir")
> +done
> +
>   if ! ${run_privileged_cmd} /bin/sh <<'EOF'
>   	failed=0
>   
> @@ -48,6 +77,10 @@ if ! ${run_privileged_cmd} /bin/sh <<'EOF'
>   	exit "$failed"
>   EOF
>   then
> +	failed=1
> +fi
> +
> +if [ "$failed" != 0 ]; then
>   	echo "error: unprivileged rootless builds are not supported; see the checks above" >&2
>   	exit 1
>   fi

-- 
You received this message because you are subscribed to the Google Groups "isar-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to isar-users+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/isar-users/3a406e64-a546-4e2f-9620-39a45bef2aa1%40ilbers.de.