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# Installation
We assume installation inside Docker (probably not the right tool for most use-cases outside Docker), and that you don't have either `wget` or `ca-certificates` already installed -- adjust (and version bump `GOSU_VERSION`) as necessary!
## `FROM debian`
[Debian 9 ("Debian Stretch") or newer](https://packages.debian.org/gosu):
```dockerfile
RUN set -eux; \
apt-get update; \
apt-get install -y gosu; \
rm -rf /var/lib/apt/lists/*; \
# verify that the binary works
gosu nobody true
```
Older Debian releases (or newer `gosu` releases):
```dockerfile
ENV GOSU_VERSION 1.14
RUN set -eux; \
# save list of currently installed packages for later so we can clean up
savedAptMark="$(apt-mark showmanual)"; \
apt-get update; \
apt-get install -y --no-install-recommends ca-certificates wget; \
if ! command -v gpg; then \
apt-get install -y --no-install-recommends gnupg2 dirmngr; \
elif gpg --version | grep -q '^gpg (GnuPG) 1\.'; then \
# "This package provides support for HKPS keyservers." (GnuPG 1.x only)
apt-get install -y --no-install-recommends gnupg-curl; \
fi; \
rm -rf /var/lib/apt/lists/*; \
\
dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \
wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \
wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.asc"; \
\
# verify the signature
export GNUPGHOME="$(mktemp -d)"; \
gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \
gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
command -v gpgconf && gpgconf --kill all || :; \
rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc; \
\
# clean up fetch dependencies
apt-mark auto '.*' > /dev/null; \
[ -z "$savedAptMark" ] || apt-mark manual $savedAptMark; \
apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
\
chmod +x /usr/local/bin/gosu; \
# verify that the binary works
gosu --version; \
gosu nobody true
```
## `FROM alpine` (3.7+)
**Note:** when using Alpine, it's probably also worth checking out [`su-exec`](https://github.com/ncopa/su-exec) (`apk add --no-cache su-exec`) instead, which since version 0.2 is fully `gosu`-compatible in a fraction of the file size.
```dockerfile
ENV GOSU_VERSION 1.14
RUN set -eux; \
\
apk add --no-cache --virtual .gosu-deps \
ca-certificates \
dpkg \
gnupg \
; \
\
dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \
wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \
wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.asc"; \
\
# verify the signature
export GNUPGHOME="$(mktemp -d)"; \
gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \
gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
command -v gpgconf && gpgconf --kill all || :; \
rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc; \
\
# clean up fetch dependencies
apk del --no-network .gosu-deps; \
\
chmod +x /usr/local/bin/gosu; \
# verify that the binary works
gosu --version; \
gosu nobody true
```
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