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From b6fbffe3d4a9435cc8560ee0271c7e6e763e89c1 Mon Sep 17 00:00:00 2001
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From: Harald Hoyer <harald@redhat.com>
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Date: Thu, 6 Mar 2014 09:12:57 +0100
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Subject: [PATCH] util: add files_same() helper function
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files_same() returns
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1, if the files are the same
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0, if the files have different inode/dev numbers
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errno, for any stat error
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(cherry picked from commit 9d9951a460a90ef0e1e0384742cefdcf85193f8c)
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Related: #1111199
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---
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src/shared/util.c | 24 ++++++++++++++++--------
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src/shared/util.h | 2 ++
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2 files changed, 18 insertions(+), 8 deletions(-)
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diff --git a/src/shared/util.c b/src/shared/util.c
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index 2974c2a..fb1e6d1 100644
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--- a/src/shared/util.c
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+++ b/src/shared/util.c
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@@ -3311,19 +3311,27 @@ bool on_tty(void) {
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return cached_on_tty;
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}
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-int running_in_chroot(void) {
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- struct stat a = {}, b = {};
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+int files_same(const char *filea, const char *fileb) {
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+ struct stat a, b;
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- /* Only works as root */
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- if (stat("/proc/1/root", &a) < 0)
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+ if (stat(filea, &a) < 0)
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return -errno;
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- if (stat("/", &b) < 0)
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+ if (stat(fileb, &b) < 0)
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return -errno;
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- return
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- a.st_dev != b.st_dev ||
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- a.st_ino != b.st_ino;
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+ return a.st_dev == b.st_dev &&
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+ a.st_ino == b.st_ino;
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+}
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+
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+int running_in_chroot(void) {
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+ int ret;
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+
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+ ret = files_same("/proc/1/root", "/");
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+ if (ret < 0)
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+ return ret;
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+
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+ return ret == 0;
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}
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char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
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diff --git a/src/shared/util.h b/src/shared/util.h
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index e577ef0..631a385 100644
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--- a/src/shared/util.h
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+++ b/src/shared/util.h
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@@ -403,6 +403,8 @@ static inline const char *ansi_highlight_off(void) {
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return on_tty() ? ANSI_HIGHLIGHT_OFF : "";
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}
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+int files_same(const char *filea, const char *fileb);
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+
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int running_in_chroot(void);
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char *ellipsize(const char *s, size_t length, unsigned percent);
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