From a1d602a74d53f5610852c1763014632de145bf8b Mon Sep 17 00:00:00 2001 From: "Yann E. MORIN" Date: Tue, 8 Nov 2016 23:18:33 +0100 Subject: package/pseudo: wrap the real pseudo with a wrapper MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Running pseudo is more involved than running fakeroot. In the transition from using fakeroot, we just did not account for the extra requirements. First, we explicitly tell pseudo where it is, otherwise it tries to guess. Its guess is correct, but it prints a warning, which is not nice. Second, we tell it where to find the passwd and group files in case it has to emulate access to them. We currently do not use that feature, but better safe than sorry. Third, pseudo spawns a background daemon, and talks to it (when fakeroot would emulate the state all in the current process' state, pseudo uses the daemon to coordinate the state across multiple processes). We are not much interested in the daemon lingering around, so we just tell it to terminate as soon as the last clients quits (this can take up to one second). Fourth and last, pseudo always stores its internal database when exiting, and reloads it when spawned. The database is by default stored in a sub-directory of the prefix it was installed in, but this is impractical for us. We want the database to be specific to the one config dir we are building, so we store the database in a (hidden) sub-dir of the build dir, thus ensuring it is never shared with another build. That directory is hidden (starts with a dot) because we consider that to be our internal state that we do not want to expose to the user. The wrapper has to be relocatable, so we avoid using hard-coded paths in there: we derive those paths fom the runtime path of pseudo. However, the build directory $(BUILD_DIR) is not available in the environment (we do not export it because it conflicts with some buildsystems). Instead, we use $(BASE_DIR) which is exported. Finally, when relocated, the wrapper would not be used in the Buildroot environment, so may not have access to TARGET_DIR or BASE_DIR, unless the user sets them. If he does not, we still want the wrapper to be working (to avoid the warning about the prefix, and to exit the daemon asap); thus we leave the passwd and localstatedir variable alone if we don't have what it needs to set them, rather than set them to incorrect values. Signed-off-by: "Yann E. MORIN" Cc: Gaël PORTAY Cc: Patrick Keroulas Cc: Erico Nunes Cc: Julien BOIBESSOT Cc: Arnout Vandecappelle Reviewed-by: Arnout Vandecappelle (Essensium/Mind) Signed-off-by: Thomas Petazzoni --- package/pseudo/pseudo-wrapper | 12 ++++++++++++ package/pseudo/pseudo.mk | 6 ++++++ 2 files changed, 18 insertions(+) create mode 100644 package/pseudo/pseudo-wrapper (limited to 'package/pseudo') diff --git a/package/pseudo/pseudo-wrapper b/package/pseudo/pseudo-wrapper new file mode 100644 index 0000000000..feaa7fcecb --- /dev/null +++ b/package/pseudo/pseudo-wrapper @@ -0,0 +1,12 @@ +#!/bin/sh + +export PSEUDO_PREFIX="$(dirname "${0%/*}")" +export PSEUDO_OPTS="-t0" +if [ -n "${TARGET_DIR}" ]; then + export PSEUDO_PASSWD="${TARGET_DIR}" +fi +if [ -n "${BASE_DIR}" ]; then + export PSEUDO_LOCALSTATEDIR="${BASE_DIR}/build/.pseudodb" +fi + +exec "${0%-wrapper}" "${@}" diff --git a/package/pseudo/pseudo.mk b/package/pseudo/pseudo.mk index a924e10c45..7701825343 100644 --- a/package/pseudo/pseudo.mk +++ b/package/pseudo/pseudo.mk @@ -26,6 +26,12 @@ HOST_PSEUDO_CONF_OPTS = \ --libdir=$(HOST_DIR)/usr/lib \ --with-sqlite=$(HOST_DIR)/usr +define HOST_PSEUDO_INSTALL_WRAPPER + $(INSTALL) -D -m 0755 $(HOST_PSEUDO_PKGDIR)/pseudo-wrapper \ + $(HOST_DIR)/usr/bin/pseudo-wrapper +endef +HOST_PSEUDO_POST_INSTALL_HOOKS += HOST_PSEUDO_INSTALL_WRAPPER + define HOST_PSEUDO_FAKEROOT_SYMLINK ln -sf pseudo $(HOST_DIR)/usr/bin/fakeroot endef -- cgit v1.2.1